wcslib (8.2.2)
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<a href="dis_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">/*============================================================================</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment"> WCSLIB 8.2 - an implementation of the FITS WCS standard.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> Copyright (C) 1995-2023, Mark Calabretta</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"></span> </div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"> This file is part of WCSLIB.</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment"></span> </div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment"> WCSLIB is free software: you can redistribute it and/or modify it under the</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment"> terms of the GNU Lesser General Public License as published by the Free</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment"> Software Foundation, either version 3 of the License, or (at your option)</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment"> any later version.</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment"></span> </div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment"> WCSLIB is distributed in the hope that it will be useful, but WITHOUT ANY</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="comment"> WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="comment"> FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="comment"> more details.</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="comment"></span> </div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment"> You should have received a copy of the GNU Lesser General Public License</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="comment"> along with WCSLIB. If not, see http://www.gnu.org/licenses.</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="comment"></span> </div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="comment"> Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="comment"> http://www.atnf.csiro.au/people/Mark.Calabretta</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="comment"> $Id: dis.h,v 8.2.1.1 2023/11/16 10:05:57 mcalabre Exp mcalabre $</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="comment">*=============================================================================</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="comment">*</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="comment">* WCSLIB 8.2 - C routines that implement the FITS World Coordinate System</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="comment">* (WCS) standard. Refer to the README file provided with WCSLIB for an</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span><span class="comment">* overview of the library.</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="comment">*</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="comment">*</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="comment">* Summary of the dis routines</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="comment">* ---------------------------</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span><span class="comment">* Routines in this suite implement extensions to the FITS World Coordinate</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="comment">* System (WCS) standard proposed by</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="comment">*</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span><span class="comment">= "Representations of distortions in FITS world coordinate systems",</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span><span class="comment">= Calabretta, M.R. et al. (WCS Paper IV, draft dated 2004/04/22),</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="comment">= available from http://www.atnf.csiro.au/people/Mark.Calabretta</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span><span class="comment">*</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span><span class="comment">* In brief, a distortion function may occupy one of two positions in the WCS</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span><span class="comment">* algorithm chain. Prior distortions precede the linear transformation</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span><span class="comment">* matrix, whether it be PCi_ja or CDi_ja, and sequent distortions follow it.</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span><span class="comment">* WCS Paper IV defines FITS keywords used to specify parameters for predefined</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="comment">* distortion functions. The following are used for prior distortions:</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span><span class="comment">*</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span><span class="comment">= CPDISja ...(string-valued, identifies the distortion function)</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span><span class="comment">= DPja ...(record-valued, parameters)</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span><span class="comment">= CPERRja ...(floating-valued, maximum value)</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span><span class="comment">*</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span><span class="comment">* Their counterparts for sequent distortions are CQDISia, DQia, and CQERRia.</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span><span class="comment">* An additional floating-valued keyword, DVERRa, records the maximum value of</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span><span class="comment">* the combined distortions.</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span><span class="comment">*</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span><span class="comment">* DPja and DQia are "record-valued". Syntactically, the keyvalues are</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span><span class="comment">* standard FITS strings, but they are to be interpreted in a special way.</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span><span class="comment">* The general form is</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span><span class="comment">*</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span><span class="comment">= DPja = '<field-specifier>: <float>'</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span><span class="comment">*</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span><span class="comment">* where the field-specifier consists of a sequence of fields separated by</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span><span class="comment">* periods, and the ': ' between the field-specifier and the floating-point</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span><span class="comment">* value is part of the record syntax. For example:</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span><span class="comment">*</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span><span class="comment">= DP1 = 'AXIS.1: 1'</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span><span class="comment">*</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span><span class="comment">* Certain field-specifiers are defined for all distortion functions, while</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span><span class="comment">* others are defined only for particular distortions. Refer to WCS Paper IV</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span><span class="comment">* for further details. wcspih() parses all distortion keywords and loads them</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span><span class="comment">* into a disprm struct for analysis by disset() which knows (or possibly does</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span><span class="comment">* not know) how to interpret them. Of the Paper IV distortion functions, only</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span><span class="comment">* the general Polynomial distortion is currently implemented here.</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span><span class="comment">*</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span><span class="comment">* TPV - the TPV "projection":</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span><span class="comment">* ---------------------------</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span><span class="comment">* The distortion function component of the TPV celestial "projection" is also</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span><span class="comment">* supported. The TPV projection, originally proposed in a draft of WCS Paper</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span><span class="comment">* II, consists of a TAN projection with sequent polynomial distortion, the</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span><span class="comment">* coefficients of which are encoded in PVi_ma keyrecords. Full details may be</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span><span class="comment">* found at the registry of FITS conventions:</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span><span class="comment">*</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span><span class="comment">= http://fits.gsfc.nasa.gov/registry/tpvwcs/tpv.html</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span><span class="comment">*</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span><span class="comment">* Internally, wcsset() changes TPV to a TAN projection, translates the PVi_ma</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span><span class="comment">* keywords to DQia and loads them into a disprm struct. These DQia keyrecords</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span><span class="comment">* have the form</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span><span class="comment">*</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span><span class="comment">= DQia = 'TPV.m: <value>'</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span><span class="comment">*</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span><span class="comment">* where i, a, m, and the value for each DQia match each PVi_ma. Consequently,</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span><span class="comment">* WCSLIB would handle a FITS header containing these keywords, along with</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span><span class="comment">* CQDISia = 'TPV' and the required DQia.NAXES and DQia.AXIS.ihat keywords.</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span><span class="comment">*</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span><span class="comment">* Note that, as defined, TPV assumes that CDi_ja is used to define the linear</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span><span class="comment">* transformation. The section on historical idiosyncrasies (below) cautions</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span><span class="comment">* about translating CDi_ja to PCi_ja plus CDELTia in this case.</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span><span class="comment">*</span></div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span><span class="comment">* SIP - Simple Imaging Polynomial:</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span><span class="comment">* --------------------------------</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span><span class="comment">* These routines also support the Simple Imaging Polynomial (SIP), whose</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span><span class="comment">* design was influenced by early drafts of WCS Paper IV. It is described in</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span><span class="comment">* detail in</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span><span class="comment">*</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span><span class="comment">= http://fits.gsfc.nasa.gov/registry/sip.html</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span><span class="comment">*</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span><span class="comment">* SIP, which is defined only as a prior distortion for 2-D celestial images,</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span><span class="comment">* has the interesting feature that it records an approximation to the inverse</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span><span class="comment">* polynomial distortion function. This is used by disx2p() to provide an</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span><span class="comment">* initial estimate for its more precise iterative inversion. The</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span><span class="comment">* special-purpose keywords used by SIP are parsed and translated by wcspih()</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span><span class="comment">* as follows:</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span><span class="comment">*</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span><span class="comment">= A_p_q = <value> -> DP1 = 'SIP.FWD.p_q: <value>'</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span><span class="comment">= AP_p_q = <value> -> DP1 = 'SIP.REV.p_q: <value>'</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span><span class="comment">= B_p_q = <value> -> DP2 = 'SIP.FWD.p_q: <value>'</span></div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span><span class="comment">= BP_p_q = <value> -> DP2 = 'SIP.REV.p_q: <value>'</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span><span class="comment">= A_DMAX = <value> -> DPERR1 = <value></span></div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span><span class="comment">= B_DMAX = <value> -> DPERR2 = <value></span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span><span class="comment">*</span></div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span><span class="comment">* SIP's A_ORDER and B_ORDER keywords are not used. WCSLIB would recognise a</span></div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span><span class="comment">* FITS header containing the above keywords, along with CPDISja = 'SIP' and</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span><span class="comment">* the required DPja.NAXES keywords.</span></div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span><span class="comment">*</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span><span class="comment">* DSS - Digitized Sky Survey:</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span><span class="comment">* ---------------------------</span></div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span><span class="comment">* The Digitized Sky Survey resulted from the production of the Guide Star</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span><span class="comment">* Catalogue for the Hubble Space Telescope. Plate solutions based on a</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span><span class="comment">* polynomial distortion function were encoded in FITS using non-standard</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span><span class="comment">* keywords. Sect. 5.2 of WCS Paper IV describes how DSS coordinates may be</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span><span class="comment">* translated to a sequent Polynomial distortion using two auxiliary variables.</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span><span class="comment">* That translation is based on optimising the non-distortion component of the</span></div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span><span class="comment">* plate solution.</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span><span class="comment">*</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span><span class="comment">* Following Paper IV, wcspih() translates the non-distortion component of DSS</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span><span class="comment">* coordinates to standard WCS keywords (CRPIXja, PCi_ja, CRVALia, etc), and</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span><span class="comment">* fills a wcsprm struct with their values. It encodes the DSS polynomial</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span><span class="comment">* coefficients as</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span><span class="comment">*</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span><span class="comment">= AMDXm = <value> -> DQ1 = 'AMD.m: <value>'</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span><span class="comment">= AMDYm = <value> -> DQ2 = 'AMD.m: <value>'</span></div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span><span class="comment">*</span></div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span><span class="comment">* WCSLIB would recognise a FITS header containing the above keywords, along</span></div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span><span class="comment">* with CQDISia = 'DSS' and the required DQia.NAXES keywords.</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span><span class="comment">*</span></div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span><span class="comment">* WAT - the TNX and ZPX "projections":</span></div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span><span class="comment">* ------------------------------------</span></div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span><span class="comment">* The TNX and ZPX "projections" add a polynomial distortion function to the</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span><span class="comment">* standard TAN and ZPN projections respectively. Unusually, the polynomial</span></div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span><span class="comment">* may be expressed as the sum of Chebyshev or Legendre polynomials, or as a</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span><span class="comment">* simple sum of monomials, as described in</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span><span class="comment">*</span></div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span><span class="comment">= http://fits.gsfc.nasa.gov/registry/tnx/tnx-doc.html</span></div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span><span class="comment">= http://fits.gsfc.nasa.gov/registry/zpxwcs/zpx.html</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span><span class="comment">*</span></div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span><span class="comment">* The polynomial coefficients are encoded in special-purpose WATi_n keywords</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span><span class="comment">* as a set of continued strings, thus providing the name for this distortion</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span><span class="comment">* type. WATi_n are parsed and translated by wcspih() into the following set:</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span><span class="comment">*</span></div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span><span class="comment">= DQi = 'WAT.POLY: <value>'</span></div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span><span class="comment">= DQi = 'WAT.XMIN: <value>'</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span><span class="comment">= DQi = 'WAT.XMAX: <value>'</span></div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span><span class="comment">= DQi = 'WAT.YMIN: <value>'</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span><span class="comment">= DQi = 'WAT.YMAX: <value>'</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span><span class="comment">= DQi = 'WAT.CHBY.m_n: <value>' or</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span><span class="comment">= DQi = 'WAT.LEGR.m_n: <value>' or</span></div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span><span class="comment">= DQi = 'WAT.MONO.m_n: <value>'</span></div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span><span class="comment">*</span></div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span><span class="comment">* along with CQDISia = 'WAT' and the required DPja.NAXES keywords. For ZPX,</span></div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span><span class="comment">* the ZPN projection parameters are also encoded in WATi_n, and wcspih()</span></div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span><span class="comment">* translates these to standard PVi_ma.</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span><span class="comment">*</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span><span class="comment">* Note that, as defined, TNX and ZPX assume that CDi_ja is used to define the</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span><span class="comment">* linear transformation. The section on historical idiosyncrasies (below)</span></div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span><span class="comment">* cautions about translating CDi_ja to PCi_ja plus CDELTia in this case.</span></div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span><span class="comment">*</span></div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span><span class="comment">* TPD - Template Polynomial Distortion:</span></div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span><span class="comment">* -------------------------------------</span></div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span><span class="comment">* The "Template Polynomial Distortion" (TPD) is a superset of the TPV, SIP,</span></div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"> 177</span><span class="comment">* DSS, and WAT (TNX & ZPX) polynomial distortions that also supports 1-D usage</span></div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span><span class="comment">* and inversions. Like TPV, SIP, and DSS, the form of the polynomial is fixed</span></div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span><span class="comment">* (the "template") and only the coefficients for the required terms are set</span></div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span><span class="comment">* non-zero. TPD generalizes TPV in going to 9th degree, SIP by accomodating</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span><span class="comment">* TPV's linear and radial terms, and DSS in both respects. While in theory</span></div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span><span class="comment">* the degree of the WAT polynomial distortion in unconstrained, in practice it</span></div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span><span class="comment">* is limited to values that can be handled by TPD.</span></div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span><span class="comment">*</span></div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span><span class="comment">* Within WCSLIB, TPV, SIP, DSS, and WAT are all implemented as special cases</span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span><span class="comment">* of TPD. Indeed, TPD was developed precisely for that purpose. WAT</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span><span class="comment">* distortions expressed as the sum of Chebyshev or Legendre polynomials are</span></div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"> 188</span><span class="comment">* expanded for TPD as a simple sum of monomials. Moreover, the general</span></div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span><span class="comment">* Polynomial distortion is translated and implemented internally as TPD</span></div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span><span class="comment">* whenever possible.</span></div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span><span class="comment">*</span></div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span><span class="comment">* However, WCSLIB also recognizes 'TPD' as a distortion function in its own</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span><span class="comment">* right (i.e. a recognized value of CPDISja or CQDISia), for use as both prior</span></div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span><span class="comment">* and sequent distortions. Its DPja and DQia keyrecords have the form</span></div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span><span class="comment">*</span></div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span><span class="comment">= DPja = 'TPD.FWD.m: <value>'</span></div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span><span class="comment">= DPja = 'TPD.REV.m: <value>'</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"> 198</span><span class="comment">*</span></div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"> 199</span><span class="comment">* for the forward and reverse distortion functions. Moreover, like the</span></div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno"> 200</span><span class="comment">* general Polynomial distortion, TPD supports auxiliary variables, though only</span></div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno"> 201</span><span class="comment">* as a linear transformation of pixel coordinates (p1,p2):</span></div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"> 202</span><span class="comment">*</span></div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno"> 203</span><span class="comment">= x = a0 + a1*p1 + a2*p2</span></div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span><span class="comment">= y = b0 + b1*p1 + b2*p2</span></div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span><span class="comment">*</span></div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"> 206</span><span class="comment">* where the coefficients of the auxiliary variables (x,y) are recorded as</span></div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno"> 207</span><span class="comment">*</span></div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno"> 208</span><span class="comment">= DPja = 'AUX.1.COEFF.0: a0' ...default 0.0</span></div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno"> 209</span><span class="comment">= DPja = 'AUX.1.COEFF.1: a1' ...default 1.0</span></div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno"> 210</span><span class="comment">= DPja = 'AUX.1.COEFF.2: a2' ...default 0.0</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno"> 211</span><span class="comment">= DPja = 'AUX.2.COEFF.0: b0' ...default 0.0</span></div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno"> 212</span><span class="comment">= DPja = 'AUX.2.COEFF.1: b1' ...default 0.0</span></div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno"> 213</span><span class="comment">= DPja = 'AUX.2.COEFF.2: b2' ...default 1.0</span></div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno"> 214</span><span class="comment">*</span></div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno"> 215</span><span class="comment">* Though nowhere near as powerful, in typical applications TPD is considerably</span></div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno"> 216</span><span class="comment">* faster than the general Polynomial distortion. As TPD has a finite and not</span></div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno"> 217</span><span class="comment">* too large number of possible terms (60), the coefficients for each can be</span></div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno"> 218</span><span class="comment">* stored (by disset()) in a fixed location in the disprm::dparm[] array. A</span></div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno"> 219</span><span class="comment">* large part of the speedup then arises from evaluating the polynomial using</span></div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno"> 220</span><span class="comment">* Horner's scheme.</span></div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno"> 221</span><span class="comment">*</span></div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno"> 222</span><span class="comment">* Separate implementations for polynomials of each degree, and conditionals</span></div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno"> 223</span><span class="comment">* for 1-D polynomials and 2-D polynomials with and without the radial</span></div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno"> 224</span><span class="comment">* variable, ensure that unused terms mostly do not impose a significant</span></div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno"> 225</span><span class="comment">* computational overhead.</span></div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno"> 226</span><span class="comment">*</span></div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno"> 227</span><span class="comment">* The TPD terms are as follows</span></div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno"> 228</span><span class="comment">*</span></div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno"> 229</span><span class="comment">= 0: 1 4: xx 12: xxxx 24: xxxxxx 40: xxxxxxxx</span></div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno"> 230</span><span class="comment">= 5: xy 13: xxxy 25: xxxxxy 41: xxxxxxxy</span></div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno"> 231</span><span class="comment">= 1: x 6: yy 14: xxyy 26: xxxxyy 42: xxxxxxyy</span></div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno"> 232</span><span class="comment">= 2: y 15: xyyy 27: xxxyyy 43: xxxxxyyy</span></div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno"> 233</span><span class="comment">= 3: r 7: xxx 16: yyyy 28: xxyyyy 44: xxxxyyyy</span></div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno"> 234</span><span class="comment">= 8: xxy 29: xyyyyy 45: xxxyyyyy</span></div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno"> 235</span><span class="comment">= 9: xyy 17: xxxxx 30: yyyyyy 46: xxyyyyyy</span></div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno"> 236</span><span class="comment">= 10: yyy 18: xxxxy 47: xyyyyyyy</span></div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno"> 237</span><span class="comment">= 11: rrr 19: xxxyy 31: xxxxxxx 48: yyyyyyyy</span></div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno"> 238</span><span class="comment">= 20: xxyyy 32: xxxxxxy</span></div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno"> 239</span><span class="comment">= 21: xyyyy 33: xxxxxyy 49: xxxxxxxxx</span></div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno"> 240</span><span class="comment">= 22: yyyyy 34: xxxxyyy 50: xxxxxxxxy</span></div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno"> 241</span><span class="comment">= 23: rrrrr 35: xxxyyyy 51: xxxxxxxyy</span></div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno"> 242</span><span class="comment">= 36: xxyyyyy 52: xxxxxxyyy</span></div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno"> 243</span><span class="comment">= 37: xyyyyyy 53: xxxxxyyyy</span></div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno"> 244</span><span class="comment">= 38: yyyyyyy 54: xxxxyyyyy</span></div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno"> 245</span><span class="comment">= 39: rrrrrrr 55: xxxyyyyyy</span></div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno"> 246</span><span class="comment">= 56: xxyyyyyyy</span></div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno"> 247</span><span class="comment">= 57: xyyyyyyyy</span></div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno"> 248</span><span class="comment">= 58: yyyyyyyyy</span></div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno"> 249</span><span class="comment">= 59: rrrrrrrrr</span></div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno"> 250</span><span class="comment">*</span></div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno"> 251</span><span class="comment">* where r = sqrt(xx + yy). Note that even powers of r are excluded since they</span></div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno"> 252</span><span class="comment">* can be accomodated by powers of (xx + yy).</span></div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno"> 253</span><span class="comment">*</span></div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno"> 254</span><span class="comment">* Note here that "x" refers to the axis to which the distortion function is</span></div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno"> 255</span><span class="comment">* attached, with "y" being the complementary axis. So, for example, with</span></div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno"> 256</span><span class="comment">* longitude on axis 1 and latitude on axis 2, for TPD attached to axis 1, "x"</span></div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno"> 257</span><span class="comment">* refers to axis 1 and "y" to axis 2. For TPD attached to axis 2, "x" refers</span></div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno"> 258</span><span class="comment">* to axis 2, and "y" to axis 1.</span></div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno"> 259</span><span class="comment">*</span></div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno"> 260</span><span class="comment">* TPV uses all terms up to 39. The m in its PVi_ma keywords translates</span></div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno"> 261</span><span class="comment">* directly to the TPD coefficient number.</span></div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno"> 262</span><span class="comment">*</span></div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno"> 263</span><span class="comment">* SIP uses all terms except for 0, 3, 11, 23, 39, and 59, with terms 1 and 2</span></div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno"> 264</span><span class="comment">* only used for the inverse. Its A_p_q, etc. keywords must be translated</span></div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno"> 265</span><span class="comment">* using a map.</span></div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno"> 266</span><span class="comment">*</span></div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno"> 267</span><span class="comment">* DSS uses terms 0, 1, 2, 4, 5, 6, 7, 8, 9, 10, 17, 19, and 21. The presence</span></div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno"> 268</span><span class="comment">* of a non-zero constant term arises through the use of auxiliary variables</span></div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno"> 269</span><span class="comment">* with origin offset from the reference point of the TAN projection. However,</span></div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno"> 270</span><span class="comment">* in the translation given by WCS Paper IV, the distortion polynomial is zero,</span></div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno"> 271</span><span class="comment">* or very close to zero, at the reference pixel itself. The mapping between</span></div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno"> 272</span><span class="comment">* DSS's AMDXm (or AMDYm) keyvalues and TPD coefficients, while still simple,</span></div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno"> 273</span><span class="comment">* is not quite as straightforward as for TPV and SIP.</span></div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno"> 274</span><span class="comment">*</span></div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno"> 275</span><span class="comment">* WAT uses all but the radial terms, namely 3, 11, 23, 39, and 59. While the</span></div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno"> 276</span><span class="comment">* mapping between WAT's monomial coefficients and TPD is fairly simple, for</span></div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno"> 277</span><span class="comment">* its expression in terms of a sum of Chebyshev or Legendre polynomials it is</span></div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno"> 278</span><span class="comment">* much less so.</span></div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno"> 279</span><span class="comment">*</span></div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno"> 280</span><span class="comment">* Historical idiosyncrasies:</span></div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno"> 281</span><span class="comment">* --------------------------</span></div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno"> 282</span><span class="comment">* In addition to the above, some historical distortion functions have further</span></div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno"> 283</span><span class="comment">* idiosyncrasies that must be taken into account when translating them to TPD.</span></div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno"> 284</span><span class="comment">*</span></div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno"> 285</span><span class="comment">* WCS Paper IV specifies that a distortion function returns a correction to be</span></div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno"> 286</span><span class="comment">* added to pixel coordinates (prior distortion) or intermediate pixel</span></div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno"> 287</span><span class="comment">* coordinates (sequent distortion). The correction is meant to be small so</span></div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno"> 288</span><span class="comment">* that ignoring the distortion function, i.e. setting the correction to zero,</span></div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno"> 289</span><span class="comment">* produces a commensurately small error.</span></div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno"> 290</span><span class="comment">*</span></div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno"> 291</span><span class="comment">* However, rather than an additive correction, some historical distortion</span></div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno"> 292</span><span class="comment">* functions (TPV, DSS) define a polynomial that returns the corrected</span></div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno"> 293</span><span class="comment">* coordinates directly.</span></div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno"> 294</span><span class="comment">*</span></div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno"> 295</span><span class="comment">* The difference between the two approaches is readily accounted for simply by</span></div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno"> 296</span><span class="comment">* adding or subtracting 1 from the coefficient of the first degree term of the</span></div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno"> 297</span><span class="comment">* polynomial. However, it opens the way for considerable confusion.</span></div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno"> 298</span><span class="comment">*</span></div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno"> 299</span><span class="comment">* Additional to the formalism of WCS Paper IV, both the Polynomial and TPD</span></div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno"> 300</span><span class="comment">* distortion functions recognise a keyword</span></div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno"> 301</span><span class="comment">*</span></div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno"> 302</span><span class="comment">= DPja = 'DOCORR: 0'</span></div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno"> 303</span><span class="comment">*</span></div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno"> 304</span><span class="comment">* which is meant to apply generally to indicate that the distortion function</span></div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno"> 305</span><span class="comment">* returns the corrected coordinates directly. Any other value for DOCORR (or</span></div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno"> 306</span><span class="comment">* its absence) indicates that the distortion function returns an additive</span></div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno"> 307</span><span class="comment">* correction.</span></div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno"> 308</span><span class="comment">*</span></div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno"> 309</span><span class="comment">* WCS Paper IV also specifies that the independent variables of a distortion</span></div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno"> 310</span><span class="comment">* function are pixel coordinates (prior distortion) or intermediate pixel</span></div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno"> 311</span><span class="comment">* coordinates (sequent distortion).</span></div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno"> 312</span><span class="comment">*</span></div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno"> 313</span><span class="comment">* On the contrary, the independent variables of the SIP polynomial are pixel</span></div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno"> 314</span><span class="comment">* coordinate offsets from the reference pixel. This is readily handled via</span></div>
<div class="line"><a id="l00315" name="l00315"></a><span class="lineno"> 315</span><span class="comment">* the renormalisation parameters</span></div>
<div class="line"><a id="l00316" name="l00316"></a><span class="lineno"> 316</span><span class="comment">*</span></div>
<div class="line"><a id="l00317" name="l00317"></a><span class="lineno"> 317</span><span class="comment">= DPja = 'OFFSET.jhat: <value>'</span></div>
<div class="line"><a id="l00318" name="l00318"></a><span class="lineno"> 318</span><span class="comment">*</span></div>
<div class="line"><a id="l00319" name="l00319"></a><span class="lineno"> 319</span><span class="comment">* where the value corresponds to CRPIXja.</span></div>
<div class="line"><a id="l00320" name="l00320"></a><span class="lineno"> 320</span><span class="comment">*</span></div>
<div class="line"><a id="l00321" name="l00321"></a><span class="lineno"> 321</span><span class="comment">* Likewise, because TPV, TNX, and ZPX are defined in terms of CDi_ja, the</span></div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno"> 322</span><span class="comment">* independent variables of the polynomial are intermediate world coordinates</span></div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno"> 323</span><span class="comment">* rather than intermediate pixel coordinates. Because sequent distortions</span></div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno"> 324</span><span class="comment">* are always applied before CDELTia, if CDi_ja is translated to PCi_ja plus</span></div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno"> 325</span><span class="comment">* CDELTia, then either CDELTia must be unity, or the distortion polynomial</span></div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno"> 326</span><span class="comment">* coefficients must be adjusted to account for the change of scale.</span></div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno"> 327</span><span class="comment">*</span></div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno"> 328</span><span class="comment">* Summary of the dis routines:</span></div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno"> 329</span><span class="comment">* ----------------------------</span></div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno"> 330</span><span class="comment">* These routines apply the distortion functions defined by the extension to</span></div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno"> 331</span><span class="comment">* the FITS WCS standard proposed in Paper IV. They are based on the disprm</span></div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno"> 332</span><span class="comment">* struct which contains all information needed for the computations. The</span></div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno"> 333</span><span class="comment">* struct contains some members that must be set by the user, and others that</span></div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno"> 334</span><span class="comment">* are maintained by these routines, somewhat like a C++ class but with no</span></div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno"> 335</span><span class="comment">* encapsulation.</span></div>
<div class="line"><a id="l00336" name="l00336"></a><span class="lineno"> 336</span><span class="comment">*</span></div>
<div class="line"><a id="l00337" name="l00337"></a><span class="lineno"> 337</span><span class="comment">* dpfill(), dpkeyi(), and dpkeyd() are provided to manage the dpkey struct.</span></div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno"> 338</span><span class="comment">*</span></div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno"> 339</span><span class="comment">* disndp(), disini(), disinit(), discpy(), and disfree() are provided to</span></div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno"> 340</span><span class="comment">* manage the disprm struct, dissize() computes its total size including</span></div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno"> 341</span><span class="comment">* allocated memory, and disprt() prints its contents.</span></div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno"> 342</span><span class="comment">*</span></div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno"> 343</span><span class="comment">* disperr() prints the error message(s) (if any) stored in a disprm struct.</span></div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno"> 344</span><span class="comment">*</span></div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno"> 345</span><span class="comment">* wcshdo() normally writes SIP and TPV headers in their native form if at all</span></div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno"> 346</span><span class="comment">* possible. However, dishdo() may be used to set a flag that tells it to</span></div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno"> 347</span><span class="comment">* write the header in the form of the TPD translation used internally.</span></div>
<div class="line"><a id="l00348" name="l00348"></a><span class="lineno"> 348</span><span class="comment">*</span></div>
<div class="line"><a id="l00349" name="l00349"></a><span class="lineno"> 349</span><span class="comment">* A setup routine, disset(), computes intermediate values in the disprm struct</span></div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno"> 350</span><span class="comment">* from parameters in it that were supplied by the user. The struct always</span></div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno"> 351</span><span class="comment">* needs to be set up by disset(), though disset() need not be called</span></div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno"> 352</span><span class="comment">* explicitly - refer to the explanation of disprm::flag.</span></div>
<div class="line"><a id="l00353" name="l00353"></a><span class="lineno"> 353</span><span class="comment">*</span></div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno"> 354</span><span class="comment">* disp2x() and disx2p() implement the WCS distortion functions, disp2x() using</span></div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno"> 355</span><span class="comment">* separate functions, such as dispoly() and tpd7(), to do the computation.</span></div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno"> 356</span><span class="comment">*</span></div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno"> 357</span><span class="comment">* An auxiliary routine, diswarp(), computes various measures of the distortion</span></div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno"> 358</span><span class="comment">* over a specified range of coordinates.</span></div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno"> 359</span><span class="comment">*</span></div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno"> 360</span><span class="comment">* PLEASE NOTE: Distortions are not yet handled by wcsbth(), or wcscompare().</span></div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno"> 361</span><span class="comment">*</span></div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno"> 362</span><span class="comment">*</span></div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno"> 363</span><span class="comment">* disndp() - Memory allocation for DPja and DQia</span></div>
<div class="line"><a id="l00364" name="l00364"></a><span class="lineno"> 364</span><span class="comment">* ----------------------------------------------</span></div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno"> 365</span><span class="comment">* disndp() sets or gets the value of NDPMAX (default 256). This global</span></div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno"> 366</span><span class="comment">* variable controls the maximum number of dpkey structs, for holding DPja or</span></div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno"> 367</span><span class="comment">* DQia keyvalues, that disini() should allocate space for. It is also used by</span></div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno"> 368</span><span class="comment">* disinit() as the default value of ndpmax.</span></div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno"> 369</span><span class="comment">*</span></div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno"> 370</span><span class="comment">* PLEASE NOTE: This function is not thread-safe.</span></div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno"> 371</span><span class="comment">*</span></div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno"> 372</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno"> 373</span><span class="comment">* n int Value of NDPMAX; ignored if < 0. Use a value less</span></div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno"> 374</span><span class="comment">* than zero to get the current value.</span></div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno"> 375</span><span class="comment">*</span></div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno"> 376</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno"> 377</span><span class="comment">* int Current value of NDPMAX.</span></div>
<div class="line"><a id="l00378" name="l00378"></a><span class="lineno"> 378</span><span class="comment">*</span></div>
<div class="line"><a id="l00379" name="l00379"></a><span class="lineno"> 379</span><span class="comment">*</span></div>
<div class="line"><a id="l00380" name="l00380"></a><span class="lineno"> 380</span><span class="comment">* dpfill() - Fill the contents of a dpkey struct</span></div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno"> 381</span><span class="comment">* ----------------------------------------------</span></div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno"> 382</span><span class="comment">* dpfill() is a utility routine to aid in filling the contents of the dpkey</span></div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno"> 383</span><span class="comment">* struct. No checks are done on the validity of the inputs.</span></div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno"> 384</span><span class="comment">*</span></div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno"> 385</span><span class="comment">* WCS Paper IV specifies the syntax of a record-valued keyword as</span></div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno"> 386</span><span class="comment">*</span></div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno"> 387</span><span class="comment">= keyword = '<field-specifier>: <float>'</span></div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno"> 388</span><span class="comment">*</span></div>
<div class="line"><a id="l00389" name="l00389"></a><span class="lineno"> 389</span><span class="comment">* However, some DPja and DQia record values, such as those of DPja.NAXES and</span></div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno"> 390</span><span class="comment">* DPja.AXIS.j, are intrinsically integer-valued. While FITS header parsers</span></div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno"> 391</span><span class="comment">* are not expected to know in advance which of DPja and DQia are integral and</span></div>
<div class="line"><a id="l00392" name="l00392"></a><span class="lineno"> 392</span><span class="comment">* which are floating point, if the record's value parses as an integer (i.e.</span></div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno"> 393</span><span class="comment">* without decimal point or exponent), then preferably enter it into the dpkey</span></div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno"> 394</span><span class="comment">* struct as an integer. Either way, it doesn't matter as disset() accepts</span></div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno"> 395</span><span class="comment">* either data type for all record values.</span></div>
<div class="line"><a id="l00396" name="l00396"></a><span class="lineno"> 396</span><span class="comment">*</span></div>
<div class="line"><a id="l00397" name="l00397"></a><span class="lineno"> 397</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00398" name="l00398"></a><span class="lineno"> 398</span><span class="comment">* dp struct dpkey*</span></div>
<div class="line"><a id="l00399" name="l00399"></a><span class="lineno"> 399</span><span class="comment">* Store for DPja and DQia keyvalues.</span></div>
<div class="line"><a id="l00400" name="l00400"></a><span class="lineno"> 400</span><span class="comment">*</span></div>
<div class="line"><a id="l00401" name="l00401"></a><span class="lineno"> 401</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00402" name="l00402"></a><span class="lineno"> 402</span><span class="comment">* keyword const char *</span></div>
<div class="line"><a id="l00403" name="l00403"></a><span class="lineno"> 403</span><span class="comment">* field const char *</span></div>
<div class="line"><a id="l00404" name="l00404"></a><span class="lineno"> 404</span><span class="comment">* These arguments are concatenated with an intervening</span></div>
<div class="line"><a id="l00405" name="l00405"></a><span class="lineno"> 405</span><span class="comment">* "." to construct the full record field name, i.e.</span></div>
<div class="line"><a id="l00406" name="l00406"></a><span class="lineno"> 406</span><span class="comment">* including the keyword name, DPja or DQia (but</span></div>
<div class="line"><a id="l00407" name="l00407"></a><span class="lineno"> 407</span><span class="comment">* excluding the colon delimiter which is NOT part of the</span></div>
<div class="line"><a id="l00408" name="l00408"></a><span class="lineno"> 408</span><span class="comment">* name). Either may be given as a NULL pointer. Set</span></div>
<div class="line"><a id="l00409" name="l00409"></a><span class="lineno"> 409</span><span class="comment">* both NULL to omit setting this component of the</span></div>
<div class="line"><a id="l00410" name="l00410"></a><span class="lineno"> 410</span><span class="comment">* struct.</span></div>
<div class="line"><a id="l00411" name="l00411"></a><span class="lineno"> 411</span><span class="comment">*</span></div>
<div class="line"><a id="l00412" name="l00412"></a><span class="lineno"> 412</span><span class="comment">* j int Axis number (1-relative), i.e. the j in DPja or</span></div>
<div class="line"><a id="l00413" name="l00413"></a><span class="lineno"> 413</span><span class="comment">* i in DQia. Can be given as 0, in which case the axis</span></div>
<div class="line"><a id="l00414" name="l00414"></a><span class="lineno"> 414</span><span class="comment">* number will be obtained from the keyword component of</span></div>
<div class="line"><a id="l00415" name="l00415"></a><span class="lineno"> 415</span><span class="comment">* the field name which must either have been given or</span></div>
<div class="line"><a id="l00416" name="l00416"></a><span class="lineno"> 416</span><span class="comment">* preset.</span></div>
<div class="line"><a id="l00417" name="l00417"></a><span class="lineno"> 417</span><span class="comment">*</span></div>
<div class="line"><a id="l00418" name="l00418"></a><span class="lineno"> 418</span><span class="comment">* If j is non-zero, and keyword was given, then the</span></div>
<div class="line"><a id="l00419" name="l00419"></a><span class="lineno"> 419</span><span class="comment">* value of j will be used to fill in the axis number.</span></div>
<div class="line"><a id="l00420" name="l00420"></a><span class="lineno"> 420</span><span class="comment">*</span></div>
<div class="line"><a id="l00421" name="l00421"></a><span class="lineno"> 421</span><span class="comment">* type int Data type of the record's value</span></div>
<div class="line"><a id="l00422" name="l00422"></a><span class="lineno"> 422</span><span class="comment">* 0: Integer,</span></div>
<div class="line"><a id="l00423" name="l00423"></a><span class="lineno"> 423</span><span class="comment">* 1: Floating point.</span></div>
<div class="line"><a id="l00424" name="l00424"></a><span class="lineno"> 424</span><span class="comment">*</span></div>
<div class="line"><a id="l00425" name="l00425"></a><span class="lineno"> 425</span><span class="comment">* i int For type == 0, the integer value of the record.</span></div>
<div class="line"><a id="l00426" name="l00426"></a><span class="lineno"> 426</span><span class="comment">*</span></div>
<div class="line"><a id="l00427" name="l00427"></a><span class="lineno"> 427</span><span class="comment">* f double For type == 1, the floating point value of the record.</span></div>
<div class="line"><a id="l00428" name="l00428"></a><span class="lineno"> 428</span><span class="comment">*</span></div>
<div class="line"><a id="l00429" name="l00429"></a><span class="lineno"> 429</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00430" name="l00430"></a><span class="lineno"> 430</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00431" name="l00431"></a><span class="lineno"> 431</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00432" name="l00432"></a><span class="lineno"> 432</span><span class="comment">*</span></div>
<div class="line"><a id="l00433" name="l00433"></a><span class="lineno"> 433</span><span class="comment">*</span></div>
<div class="line"><a id="l00434" name="l00434"></a><span class="lineno"> 434</span><span class="comment">* dpkeyi() - Get the data value in a dpkey struct as int</span></div>
<div class="line"><a id="l00435" name="l00435"></a><span class="lineno"> 435</span><span class="comment">* ------------------------------------------------------</span></div>
<div class="line"><a id="l00436" name="l00436"></a><span class="lineno"> 436</span><span class="comment">* dpkeyi() returns the data value in a dpkey struct as an integer value.</span></div>
<div class="line"><a id="l00437" name="l00437"></a><span class="lineno"> 437</span><span class="comment">*</span></div>
<div class="line"><a id="l00438" name="l00438"></a><span class="lineno"> 438</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00439" name="l00439"></a><span class="lineno"> 439</span><span class="comment">* dp const struct dpkey *</span></div>
<div class="line"><a id="l00440" name="l00440"></a><span class="lineno"> 440</span><span class="comment">* Parsed contents of a DPja or DQia keyrecord.</span></div>
<div class="line"><a id="l00441" name="l00441"></a><span class="lineno"> 441</span><span class="comment">*</span></div>
<div class="line"><a id="l00442" name="l00442"></a><span class="lineno"> 442</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00443" name="l00443"></a><span class="lineno"> 443</span><span class="comment">* int The record's value as int.</span></div>
<div class="line"><a id="l00444" name="l00444"></a><span class="lineno"> 444</span><span class="comment">*</span></div>
<div class="line"><a id="l00445" name="l00445"></a><span class="lineno"> 445</span><span class="comment">*</span></div>
<div class="line"><a id="l00446" name="l00446"></a><span class="lineno"> 446</span><span class="comment">* dpkeyd() - Get the data value in a dpkey struct as double</span></div>
<div class="line"><a id="l00447" name="l00447"></a><span class="lineno"> 447</span><span class="comment">* ---------------------------------------------------------</span></div>
<div class="line"><a id="l00448" name="l00448"></a><span class="lineno"> 448</span><span class="comment">* dpkeyd() returns the data value in a dpkey struct as a floating point</span></div>
<div class="line"><a id="l00449" name="l00449"></a><span class="lineno"> 449</span><span class="comment">* value.</span></div>
<div class="line"><a id="l00450" name="l00450"></a><span class="lineno"> 450</span><span class="comment">*</span></div>
<div class="line"><a id="l00451" name="l00451"></a><span class="lineno"> 451</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00452" name="l00452"></a><span class="lineno"> 452</span><span class="comment">* dp const struct dpkey *</span></div>
<div class="line"><a id="l00453" name="l00453"></a><span class="lineno"> 453</span><span class="comment">* Parsed contents of a DPja or DQia keyrecord.</span></div>
<div class="line"><a id="l00454" name="l00454"></a><span class="lineno"> 454</span><span class="comment">*</span></div>
<div class="line"><a id="l00455" name="l00455"></a><span class="lineno"> 455</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00456" name="l00456"></a><span class="lineno"> 456</span><span class="comment">* double The record's value as double.</span></div>
<div class="line"><a id="l00457" name="l00457"></a><span class="lineno"> 457</span><span class="comment">*</span></div>
<div class="line"><a id="l00458" name="l00458"></a><span class="lineno"> 458</span><span class="comment">*</span></div>
<div class="line"><a id="l00459" name="l00459"></a><span class="lineno"> 459</span><span class="comment">* disini() - Default constructor for the disprm struct</span></div>
<div class="line"><a id="l00460" name="l00460"></a><span class="lineno"> 460</span><span class="comment">* ----------------------------------------------------</span></div>
<div class="line"><a id="l00461" name="l00461"></a><span class="lineno"> 461</span><span class="comment">* disini() is a thin wrapper on disinit(). It invokes it with ndpmax set</span></div>
<div class="line"><a id="l00462" name="l00462"></a><span class="lineno"> 462</span><span class="comment">* to -1 which causes it to use the value of the global variable NDPMAX. It</span></div>
<div class="line"><a id="l00463" name="l00463"></a><span class="lineno"> 463</span><span class="comment">* is thereby potentially thread-unsafe if NDPMAX is altered dynamically via</span></div>
<div class="line"><a id="l00464" name="l00464"></a><span class="lineno"> 464</span><span class="comment">* disndp(). Use disinit() for a thread-safe alternative in this case.</span></div>
<div class="line"><a id="l00465" name="l00465"></a><span class="lineno"> 465</span><span class="comment">*</span></div>
<div class="line"><a id="l00466" name="l00466"></a><span class="lineno"> 466</span><span class="comment">*</span></div>
<div class="line"><a id="l00467" name="l00467"></a><span class="lineno"> 467</span><span class="comment">* disinit() - Default constructor for the disprm struct</span></div>
<div class="line"><a id="l00468" name="l00468"></a><span class="lineno"> 468</span><span class="comment">* ----------------------------------------------------</span></div>
<div class="line"><a id="l00469" name="l00469"></a><span class="lineno"> 469</span><span class="comment">* disinit() allocates memory for arrays in a disprm struct and sets all</span></div>
<div class="line"><a id="l00470" name="l00470"></a><span class="lineno"> 470</span><span class="comment">* members of the struct to default values.</span></div>
<div class="line"><a id="l00471" name="l00471"></a><span class="lineno"> 471</span><span class="comment">*</span></div>
<div class="line"><a id="l00472" name="l00472"></a><span class="lineno"> 472</span><span class="comment">* PLEASE NOTE: every disprm struct must be initialized by disinit(), possibly</span></div>
<div class="line"><a id="l00473" name="l00473"></a><span class="lineno"> 473</span><span class="comment">* repeatedly. On the first invokation, and only the first invokation,</span></div>
<div class="line"><a id="l00474" name="l00474"></a><span class="lineno"> 474</span><span class="comment">* disprm::flag must be set to -1 to initialize memory management, regardless</span></div>
<div class="line"><a id="l00475" name="l00475"></a><span class="lineno"> 475</span><span class="comment">* of whether disinit() will actually be used to allocate memory.</span></div>
<div class="line"><a id="l00476" name="l00476"></a><span class="lineno"> 476</span><span class="comment">*</span></div>
<div class="line"><a id="l00477" name="l00477"></a><span class="lineno"> 477</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00478" name="l00478"></a><span class="lineno"> 478</span><span class="comment">* alloc int If true, allocate memory unconditionally for arrays in</span></div>
<div class="line"><a id="l00479" name="l00479"></a><span class="lineno"> 479</span><span class="comment">* the disprm struct.</span></div>
<div class="line"><a id="l00480" name="l00480"></a><span class="lineno"> 480</span><span class="comment">*</span></div>
<div class="line"><a id="l00481" name="l00481"></a><span class="lineno"> 481</span><span class="comment">* If false, it is assumed that pointers to these arrays</span></div>
<div class="line"><a id="l00482" name="l00482"></a><span class="lineno"> 482</span><span class="comment">* have been set by the user except if they are null</span></div>
<div class="line"><a id="l00483" name="l00483"></a><span class="lineno"> 483</span><span class="comment">* pointers in which case memory will be allocated for</span></div>
<div class="line"><a id="l00484" name="l00484"></a><span class="lineno"> 484</span><span class="comment">* them regardless. (In other words, setting alloc true</span></div>
<div class="line"><a id="l00485" name="l00485"></a><span class="lineno"> 485</span><span class="comment">* saves having to initalize these pointers to zero.)</span></div>
<div class="line"><a id="l00486" name="l00486"></a><span class="lineno"> 486</span><span class="comment">*</span></div>
<div class="line"><a id="l00487" name="l00487"></a><span class="lineno"> 487</span><span class="comment">* naxis int The number of world coordinate axes, used to determine</span></div>
<div class="line"><a id="l00488" name="l00488"></a><span class="lineno"> 488</span><span class="comment">* array sizes.</span></div>
<div class="line"><a id="l00489" name="l00489"></a><span class="lineno"> 489</span><span class="comment">*</span></div>
<div class="line"><a id="l00490" name="l00490"></a><span class="lineno"> 490</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00491" name="l00491"></a><span class="lineno"> 491</span><span class="comment">* dis struct disprm*</span></div>
<div class="line"><a id="l00492" name="l00492"></a><span class="lineno"> 492</span><span class="comment">* Distortion function parameters. Note that, in order</span></div>
<div class="line"><a id="l00493" name="l00493"></a><span class="lineno"> 493</span><span class="comment">* to initialize memory management disprm::flag must be</span></div>
<div class="line"><a id="l00494" name="l00494"></a><span class="lineno"> 494</span><span class="comment">* set to -1 when dis is initialized for the first time</span></div>
<div class="line"><a id="l00495" name="l00495"></a><span class="lineno"> 495</span><span class="comment">* (memory leaks may result if it had already been</span></div>
<div class="line"><a id="l00496" name="l00496"></a><span class="lineno"> 496</span><span class="comment">* initialized).</span></div>
<div class="line"><a id="l00497" name="l00497"></a><span class="lineno"> 497</span><span class="comment">*</span></div>
<div class="line"><a id="l00498" name="l00498"></a><span class="lineno"> 498</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00499" name="l00499"></a><span class="lineno"> 499</span><span class="comment">* ndpmax int The number of DPja or DQia keywords to allocate space</span></div>
<div class="line"><a id="l00500" name="l00500"></a><span class="lineno"> 500</span><span class="comment">* for. If set to -1, the value of the global variable</span></div>
<div class="line"><a id="l00501" name="l00501"></a><span class="lineno"> 501</span><span class="comment">* NDPMAX will be used. This is potentially</span></div>
<div class="line"><a id="l00502" name="l00502"></a><span class="lineno"> 502</span><span class="comment">* thread-unsafe if disndp() is being used dynamically to</span></div>
<div class="line"><a id="l00503" name="l00503"></a><span class="lineno"> 503</span><span class="comment">* alter its value.</span></div>
<div class="line"><a id="l00504" name="l00504"></a><span class="lineno"> 504</span><span class="comment">*</span></div>
<div class="line"><a id="l00505" name="l00505"></a><span class="lineno"> 505</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00506" name="l00506"></a><span class="lineno"> 506</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00507" name="l00507"></a><span class="lineno"> 507</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00508" name="l00508"></a><span class="lineno"> 508</span><span class="comment">* 1: Null disprm pointer passed.</span></div>
<div class="line"><a id="l00509" name="l00509"></a><span class="lineno"> 509</span><span class="comment">* 2: Memory allocation failed.</span></div>
<div class="line"><a id="l00510" name="l00510"></a><span class="lineno"> 510</span><span class="comment">*</span></div>
<div class="line"><a id="l00511" name="l00511"></a><span class="lineno"> 511</span><span class="comment">* For returns > 1, a detailed error message is set in</span></div>
<div class="line"><a id="l00512" name="l00512"></a><span class="lineno"> 512</span><span class="comment">* disprm::err if enabled, see wcserr_enable().</span></div>
<div class="line"><a id="l00513" name="l00513"></a><span class="lineno"> 513</span><span class="comment">*</span></div>
<div class="line"><a id="l00514" name="l00514"></a><span class="lineno"> 514</span><span class="comment">*</span></div>
<div class="line"><a id="l00515" name="l00515"></a><span class="lineno"> 515</span><span class="comment">* discpy() - Copy routine for the disprm struct</span></div>
<div class="line"><a id="l00516" name="l00516"></a><span class="lineno"> 516</span><span class="comment">* ---------------------------------------------</span></div>
<div class="line"><a id="l00517" name="l00517"></a><span class="lineno"> 517</span><span class="comment">* discpy() does a deep copy of one disprm struct to another, using disinit()</span></div>
<div class="line"><a id="l00518" name="l00518"></a><span class="lineno"> 518</span><span class="comment">* to allocate memory unconditionally for its arrays if required. Only the</span></div>
<div class="line"><a id="l00519" name="l00519"></a><span class="lineno"> 519</span><span class="comment">* "information to be provided" part of the struct is copied; a call to</span></div>
<div class="line"><a id="l00520" name="l00520"></a><span class="lineno"> 520</span><span class="comment">* disset() is required to initialize the remainder.</span></div>
<div class="line"><a id="l00521" name="l00521"></a><span class="lineno"> 521</span><span class="comment">*</span></div>
<div class="line"><a id="l00522" name="l00522"></a><span class="lineno"> 522</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00523" name="l00523"></a><span class="lineno"> 523</span><span class="comment">* alloc int If true, allocate memory unconditionally for arrays in</span></div>
<div class="line"><a id="l00524" name="l00524"></a><span class="lineno"> 524</span><span class="comment">* the destination. Otherwise, it is assumed that</span></div>
<div class="line"><a id="l00525" name="l00525"></a><span class="lineno"> 525</span><span class="comment">* pointers to these arrays have been set by the user</span></div>
<div class="line"><a id="l00526" name="l00526"></a><span class="lineno"> 526</span><span class="comment">* except if they are null pointers in which case memory</span></div>
<div class="line"><a id="l00527" name="l00527"></a><span class="lineno"> 527</span><span class="comment">* will be allocated for them regardless.</span></div>
<div class="line"><a id="l00528" name="l00528"></a><span class="lineno"> 528</span><span class="comment">*</span></div>
<div class="line"><a id="l00529" name="l00529"></a><span class="lineno"> 529</span><span class="comment">* dissrc const struct disprm*</span></div>
<div class="line"><a id="l00530" name="l00530"></a><span class="lineno"> 530</span><span class="comment">* Struct to copy from.</span></div>
<div class="line"><a id="l00531" name="l00531"></a><span class="lineno"> 531</span><span class="comment">*</span></div>
<div class="line"><a id="l00532" name="l00532"></a><span class="lineno"> 532</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00533" name="l00533"></a><span class="lineno"> 533</span><span class="comment">* disdst struct disprm*</span></div>
<div class="line"><a id="l00534" name="l00534"></a><span class="lineno"> 534</span><span class="comment">* Struct to copy to. disprm::flag should be set to -1</span></div>
<div class="line"><a id="l00535" name="l00535"></a><span class="lineno"> 535</span><span class="comment">* if disdst was not previously initialized (memory leaks</span></div>
<div class="line"><a id="l00536" name="l00536"></a><span class="lineno"> 536</span><span class="comment">* may result if it was previously initialized).</span></div>
<div class="line"><a id="l00537" name="l00537"></a><span class="lineno"> 537</span><span class="comment">*</span></div>
<div class="line"><a id="l00538" name="l00538"></a><span class="lineno"> 538</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00539" name="l00539"></a><span class="lineno"> 539</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00540" name="l00540"></a><span class="lineno"> 540</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00541" name="l00541"></a><span class="lineno"> 541</span><span class="comment">* 1: Null disprm pointer passed.</span></div>
<div class="line"><a id="l00542" name="l00542"></a><span class="lineno"> 542</span><span class="comment">* 2: Memory allocation failed.</span></div>
<div class="line"><a id="l00543" name="l00543"></a><span class="lineno"> 543</span><span class="comment">*</span></div>
<div class="line"><a id="l00544" name="l00544"></a><span class="lineno"> 544</span><span class="comment">* For returns > 1, a detailed error message is set in</span></div>
<div class="line"><a id="l00545" name="l00545"></a><span class="lineno"> 545</span><span class="comment">* disprm::err if enabled, see wcserr_enable().</span></div>
<div class="line"><a id="l00546" name="l00546"></a><span class="lineno"> 546</span><span class="comment">*</span></div>
<div class="line"><a id="l00547" name="l00547"></a><span class="lineno"> 547</span><span class="comment">*</span></div>
<div class="line"><a id="l00548" name="l00548"></a><span class="lineno"> 548</span><span class="comment">* disfree() - Destructor for the disprm struct</span></div>
<div class="line"><a id="l00549" name="l00549"></a><span class="lineno"> 549</span><span class="comment">* --------------------------------------------</span></div>
<div class="line"><a id="l00550" name="l00550"></a><span class="lineno"> 550</span><span class="comment">* disfree() frees memory allocated for the disprm arrays by disinit().</span></div>
<div class="line"><a id="l00551" name="l00551"></a><span class="lineno"> 551</span><span class="comment">* disinit() keeps a record of the memory it allocates and disfree() will only</span></div>
<div class="line"><a id="l00552" name="l00552"></a><span class="lineno"> 552</span><span class="comment">* attempt to free this.</span></div>
<div class="line"><a id="l00553" name="l00553"></a><span class="lineno"> 553</span><span class="comment">*</span></div>
<div class="line"><a id="l00554" name="l00554"></a><span class="lineno"> 554</span><span class="comment">* PLEASE NOTE: disfree() must not be invoked on a disprm struct that was not</span></div>
<div class="line"><a id="l00555" name="l00555"></a><span class="lineno"> 555</span><span class="comment">* initialized by disinit().</span></div>
<div class="line"><a id="l00556" name="l00556"></a><span class="lineno"> 556</span><span class="comment">*</span></div>
<div class="line"><a id="l00557" name="l00557"></a><span class="lineno"> 557</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00558" name="l00558"></a><span class="lineno"> 558</span><span class="comment">* dis struct disprm*</span></div>
<div class="line"><a id="l00559" name="l00559"></a><span class="lineno"> 559</span><span class="comment">* Distortion function parameters.</span></div>
<div class="line"><a id="l00560" name="l00560"></a><span class="lineno"> 560</span><span class="comment">*</span></div>
<div class="line"><a id="l00561" name="l00561"></a><span class="lineno"> 561</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00562" name="l00562"></a><span class="lineno"> 562</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00563" name="l00563"></a><span class="lineno"> 563</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00564" name="l00564"></a><span class="lineno"> 564</span><span class="comment">* 1: Null disprm pointer passed.</span></div>
<div class="line"><a id="l00565" name="l00565"></a><span class="lineno"> 565</span><span class="comment">*</span></div>
<div class="line"><a id="l00566" name="l00566"></a><span class="lineno"> 566</span><span class="comment">*</span></div>
<div class="line"><a id="l00567" name="l00567"></a><span class="lineno"> 567</span><span class="comment">* dissize() - Compute the size of a disprm struct</span></div>
<div class="line"><a id="l00568" name="l00568"></a><span class="lineno"> 568</span><span class="comment">* -----------------------------------------------</span></div>
<div class="line"><a id="l00569" name="l00569"></a><span class="lineno"> 569</span><span class="comment">* dissize() computes the full size of a disprm struct, including allocated</span></div>
<div class="line"><a id="l00570" name="l00570"></a><span class="lineno"> 570</span><span class="comment">* memory.</span></div>
<div class="line"><a id="l00571" name="l00571"></a><span class="lineno"> 571</span><span class="comment">*</span></div>
<div class="line"><a id="l00572" name="l00572"></a><span class="lineno"> 572</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00573" name="l00573"></a><span class="lineno"> 573</span><span class="comment">* dis const struct disprm*</span></div>
<div class="line"><a id="l00574" name="l00574"></a><span class="lineno"> 574</span><span class="comment">* Distortion function parameters.</span></div>
<div class="line"><a id="l00575" name="l00575"></a><span class="lineno"> 575</span><span class="comment">*</span></div>
<div class="line"><a id="l00576" name="l00576"></a><span class="lineno"> 576</span><span class="comment">* If NULL, the base size of the struct and the allocated</span></div>
<div class="line"><a id="l00577" name="l00577"></a><span class="lineno"> 577</span><span class="comment">* size are both set to zero.</span></div>
<div class="line"><a id="l00578" name="l00578"></a><span class="lineno"> 578</span><span class="comment">*</span></div>
<div class="line"><a id="l00579" name="l00579"></a><span class="lineno"> 579</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00580" name="l00580"></a><span class="lineno"> 580</span><span class="comment">* sizes int[2] The first element is the base size of the struct as</span></div>
<div class="line"><a id="l00581" name="l00581"></a><span class="lineno"> 581</span><span class="comment">* returned by sizeof(struct disprm). The second element</span></div>
<div class="line"><a id="l00582" name="l00582"></a><span class="lineno"> 582</span><span class="comment">* is the total allocated size, in bytes, assuming that</span></div>
<div class="line"><a id="l00583" name="l00583"></a><span class="lineno"> 583</span><span class="comment">* the allocation was done by disini(). This figure</span></div>
<div class="line"><a id="l00584" name="l00584"></a><span class="lineno"> 584</span><span class="comment">* includes memory allocated for members of constituent</span></div>
<div class="line"><a id="l00585" name="l00585"></a><span class="lineno"> 585</span><span class="comment">* structs, such as disprm::dp.</span></div>
<div class="line"><a id="l00586" name="l00586"></a><span class="lineno"> 586</span><span class="comment">*</span></div>
<div class="line"><a id="l00587" name="l00587"></a><span class="lineno"> 587</span><span class="comment">* It is not an error for the struct not to have been set</span></div>
<div class="line"><a id="l00588" name="l00588"></a><span class="lineno"> 588</span><span class="comment">* up via tabset(), which normally results in additional</span></div>
<div class="line"><a id="l00589" name="l00589"></a><span class="lineno"> 589</span><span class="comment">* memory allocation. </span></div>
<div class="line"><a id="l00590" name="l00590"></a><span class="lineno"> 590</span><span class="comment">*</span></div>
<div class="line"><a id="l00591" name="l00591"></a><span class="lineno"> 591</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00592" name="l00592"></a><span class="lineno"> 592</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00593" name="l00593"></a><span class="lineno"> 593</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00594" name="l00594"></a><span class="lineno"> 594</span><span class="comment">*</span></div>
<div class="line"><a id="l00595" name="l00595"></a><span class="lineno"> 595</span><span class="comment">*</span></div>
<div class="line"><a id="l00596" name="l00596"></a><span class="lineno"> 596</span><span class="comment">* disprt() - Print routine for the disprm struct</span></div>
<div class="line"><a id="l00597" name="l00597"></a><span class="lineno"> 597</span><span class="comment">* ----------------------------------------------</span></div>
<div class="line"><a id="l00598" name="l00598"></a><span class="lineno"> 598</span><span class="comment">* disprt() prints the contents of a disprm struct using wcsprintf(). Mainly</span></div>
<div class="line"><a id="l00599" name="l00599"></a><span class="lineno"> 599</span><span class="comment">* intended for diagnostic purposes.</span></div>
<div class="line"><a id="l00600" name="l00600"></a><span class="lineno"> 600</span><span class="comment">*</span></div>
<div class="line"><a id="l00601" name="l00601"></a><span class="lineno"> 601</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00602" name="l00602"></a><span class="lineno"> 602</span><span class="comment">* dis const struct disprm*</span></div>
<div class="line"><a id="l00603" name="l00603"></a><span class="lineno"> 603</span><span class="comment">* Distortion function parameters.</span></div>
<div class="line"><a id="l00604" name="l00604"></a><span class="lineno"> 604</span><span class="comment">*</span></div>
<div class="line"><a id="l00605" name="l00605"></a><span class="lineno"> 605</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00606" name="l00606"></a><span class="lineno"> 606</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00607" name="l00607"></a><span class="lineno"> 607</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00608" name="l00608"></a><span class="lineno"> 608</span><span class="comment">* 1: Null disprm pointer passed.</span></div>
<div class="line"><a id="l00609" name="l00609"></a><span class="lineno"> 609</span><span class="comment">*</span></div>
<div class="line"><a id="l00610" name="l00610"></a><span class="lineno"> 610</span><span class="comment">*</span></div>
<div class="line"><a id="l00611" name="l00611"></a><span class="lineno"> 611</span><span class="comment">* disperr() - Print error messages from a disprm struct</span></div>
<div class="line"><a id="l00612" name="l00612"></a><span class="lineno"> 612</span><span class="comment">* -----------------------------------------------------</span></div>
<div class="line"><a id="l00613" name="l00613"></a><span class="lineno"> 613</span><span class="comment">* disperr() prints the error message(s) (if any) stored in a disprm struct.</span></div>
<div class="line"><a id="l00614" name="l00614"></a><span class="lineno"> 614</span><span class="comment">* If there are no errors then nothing is printed. It uses wcserr_prt(), q.v.</span></div>
<div class="line"><a id="l00615" name="l00615"></a><span class="lineno"> 615</span><span class="comment">*</span></div>
<div class="line"><a id="l00616" name="l00616"></a><span class="lineno"> 616</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00617" name="l00617"></a><span class="lineno"> 617</span><span class="comment">* dis const struct disprm*</span></div>
<div class="line"><a id="l00618" name="l00618"></a><span class="lineno"> 618</span><span class="comment">* Distortion function parameters.</span></div>
<div class="line"><a id="l00619" name="l00619"></a><span class="lineno"> 619</span><span class="comment">*</span></div>
<div class="line"><a id="l00620" name="l00620"></a><span class="lineno"> 620</span><span class="comment">* prefix const char *</span></div>
<div class="line"><a id="l00621" name="l00621"></a><span class="lineno"> 621</span><span class="comment">* If non-NULL, each output line will be prefixed with</span></div>
<div class="line"><a id="l00622" name="l00622"></a><span class="lineno"> 622</span><span class="comment">* this string.</span></div>
<div class="line"><a id="l00623" name="l00623"></a><span class="lineno"> 623</span><span class="comment">*</span></div>
<div class="line"><a id="l00624" name="l00624"></a><span class="lineno"> 624</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00625" name="l00625"></a><span class="lineno"> 625</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00626" name="l00626"></a><span class="lineno"> 626</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00627" name="l00627"></a><span class="lineno"> 627</span><span class="comment">* 1: Null disprm pointer passed.</span></div>
<div class="line"><a id="l00628" name="l00628"></a><span class="lineno"> 628</span><span class="comment">*</span></div>
<div class="line"><a id="l00629" name="l00629"></a><span class="lineno"> 629</span><span class="comment">*</span></div>
<div class="line"><a id="l00630" name="l00630"></a><span class="lineno"> 630</span><span class="comment">* dishdo() - write FITS headers using TPD</span></div>
<div class="line"><a id="l00631" name="l00631"></a><span class="lineno"> 631</span><span class="comment">* ---------------------------------------</span></div>
<div class="line"><a id="l00632" name="l00632"></a><span class="lineno"> 632</span><span class="comment">* dishdo() sets a flag that tells wcshdo() to write FITS headers in the form</span></div>
<div class="line"><a id="l00633" name="l00633"></a><span class="lineno"> 633</span><span class="comment">* of the TPD translation used internally. Normally SIP and TPV would be</span></div>
<div class="line"><a id="l00634" name="l00634"></a><span class="lineno"> 634</span><span class="comment">* written in their native form if at all possible.</span></div>
<div class="line"><a id="l00635" name="l00635"></a><span class="lineno"> 635</span><span class="comment">*</span></div>
<div class="line"><a id="l00636" name="l00636"></a><span class="lineno"> 636</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00637" name="l00637"></a><span class="lineno"> 637</span><span class="comment">* dis struct disprm*</span></div>
<div class="line"><a id="l00638" name="l00638"></a><span class="lineno"> 638</span><span class="comment">* Distortion function parameters.</span></div>
<div class="line"><a id="l00639" name="l00639"></a><span class="lineno"> 639</span><span class="comment">*</span></div>
<div class="line"><a id="l00640" name="l00640"></a><span class="lineno"> 640</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00641" name="l00641"></a><span class="lineno"> 641</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00642" name="l00642"></a><span class="lineno"> 642</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00643" name="l00643"></a><span class="lineno"> 643</span><span class="comment">* 1: Null disprm pointer passed.</span></div>
<div class="line"><a id="l00644" name="l00644"></a><span class="lineno"> 644</span><span class="comment">* 3: No TPD translation.</span></div>
<div class="line"><a id="l00645" name="l00645"></a><span class="lineno"> 645</span><span class="comment">*</span></div>
<div class="line"><a id="l00646" name="l00646"></a><span class="lineno"> 646</span><span class="comment">*</span></div>
<div class="line"><a id="l00647" name="l00647"></a><span class="lineno"> 647</span><span class="comment">* disset() - Setup routine for the disprm struct</span></div>
<div class="line"><a id="l00648" name="l00648"></a><span class="lineno"> 648</span><span class="comment">* ----------------------------------------------</span></div>
<div class="line"><a id="l00649" name="l00649"></a><span class="lineno"> 649</span><span class="comment">* disset(), sets up the disprm struct according to information supplied within</span></div>
<div class="line"><a id="l00650" name="l00650"></a><span class="lineno"> 650</span><span class="comment">* it - refer to the explanation of disprm::flag.</span></div>
<div class="line"><a id="l00651" name="l00651"></a><span class="lineno"> 651</span><span class="comment">*</span></div>
<div class="line"><a id="l00652" name="l00652"></a><span class="lineno"> 652</span><span class="comment">* Note that this routine need not be called directly; it will be invoked by</span></div>
<div class="line"><a id="l00653" name="l00653"></a><span class="lineno"> 653</span><span class="comment">* disp2x() and disx2p() if the disprm::flag is anything other than a</span></div>
<div class="line"><a id="l00654" name="l00654"></a><span class="lineno"> 654</span><span class="comment">* predefined magic value.</span></div>
<div class="line"><a id="l00655" name="l00655"></a><span class="lineno"> 655</span><span class="comment">*</span></div>
<div class="line"><a id="l00656" name="l00656"></a><span class="lineno"> 656</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00657" name="l00657"></a><span class="lineno"> 657</span><span class="comment">* dis struct disprm*</span></div>
<div class="line"><a id="l00658" name="l00658"></a><span class="lineno"> 658</span><span class="comment">* Distortion function parameters.</span></div>
<div class="line"><a id="l00659" name="l00659"></a><span class="lineno"> 659</span><span class="comment">*</span></div>
<div class="line"><a id="l00660" name="l00660"></a><span class="lineno"> 660</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00661" name="l00661"></a><span class="lineno"> 661</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00662" name="l00662"></a><span class="lineno"> 662</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00663" name="l00663"></a><span class="lineno"> 663</span><span class="comment">* 1: Null disprm pointer passed.</span></div>
<div class="line"><a id="l00664" name="l00664"></a><span class="lineno"> 664</span><span class="comment">* 2: Memory allocation failed.</span></div>
<div class="line"><a id="l00665" name="l00665"></a><span class="lineno"> 665</span><span class="comment">* 3: Invalid parameter.</span></div>
<div class="line"><a id="l00666" name="l00666"></a><span class="lineno"> 666</span><span class="comment">*</span></div>
<div class="line"><a id="l00667" name="l00667"></a><span class="lineno"> 667</span><span class="comment">* For returns > 1, a detailed error message is set in</span></div>
<div class="line"><a id="l00668" name="l00668"></a><span class="lineno"> 668</span><span class="comment">* disprm::err if enabled, see wcserr_enable().</span></div>
<div class="line"><a id="l00669" name="l00669"></a><span class="lineno"> 669</span><span class="comment">*</span></div>
<div class="line"><a id="l00670" name="l00670"></a><span class="lineno"> 670</span><span class="comment">*</span></div>
<div class="line"><a id="l00671" name="l00671"></a><span class="lineno"> 671</span><span class="comment">* disp2x() - Apply distortion function</span></div>
<div class="line"><a id="l00672" name="l00672"></a><span class="lineno"> 672</span><span class="comment">* ------------------------------------</span></div>
<div class="line"><a id="l00673" name="l00673"></a><span class="lineno"> 673</span><span class="comment">* disp2x() applies the distortion functions. By definition, the distortion</span></div>
<div class="line"><a id="l00674" name="l00674"></a><span class="lineno"> 674</span><span class="comment">* is in the pixel-to-world direction.</span></div>
<div class="line"><a id="l00675" name="l00675"></a><span class="lineno"> 675</span><span class="comment">*</span></div>
<div class="line"><a id="l00676" name="l00676"></a><span class="lineno"> 676</span><span class="comment">* Depending on the point in the algorithm chain at which it is invoked,</span></div>
<div class="line"><a id="l00677" name="l00677"></a><span class="lineno"> 677</span><span class="comment">* disp2x() may transform pixel coordinates to corrected pixel coordinates, or</span></div>
<div class="line"><a id="l00678" name="l00678"></a><span class="lineno"> 678</span><span class="comment">* intermediate pixel coordinates to corrected intermediate pixel coordinates,</span></div>
<div class="line"><a id="l00679" name="l00679"></a><span class="lineno"> 679</span><span class="comment">* or image coordinates to corrected image coordinates.</span></div>
<div class="line"><a id="l00680" name="l00680"></a><span class="lineno"> 680</span><span class="comment">*</span></div>
<div class="line"><a id="l00681" name="l00681"></a><span class="lineno"> 681</span><span class="comment">*</span></div>
<div class="line"><a id="l00682" name="l00682"></a><span class="lineno"> 682</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00683" name="l00683"></a><span class="lineno"> 683</span><span class="comment">* dis struct disprm*</span></div>
<div class="line"><a id="l00684" name="l00684"></a><span class="lineno"> 684</span><span class="comment">* Distortion function parameters.</span></div>
<div class="line"><a id="l00685" name="l00685"></a><span class="lineno"> 685</span><span class="comment">*</span></div>
<div class="line"><a id="l00686" name="l00686"></a><span class="lineno"> 686</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00687" name="l00687"></a><span class="lineno"> 687</span><span class="comment">* rawcrd const double[naxis]</span></div>
<div class="line"><a id="l00688" name="l00688"></a><span class="lineno"> 688</span><span class="comment">* Array of coordinates.</span></div>
<div class="line"><a id="l00689" name="l00689"></a><span class="lineno"> 689</span><span class="comment">*</span></div>
<div class="line"><a id="l00690" name="l00690"></a><span class="lineno"> 690</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00691" name="l00691"></a><span class="lineno"> 691</span><span class="comment">* discrd double[naxis]</span></div>
<div class="line"><a id="l00692" name="l00692"></a><span class="lineno"> 692</span><span class="comment">* Array of coordinates to which the distortion functions</span></div>
<div class="line"><a id="l00693" name="l00693"></a><span class="lineno"> 693</span><span class="comment">* have been applied.</span></div>
<div class="line"><a id="l00694" name="l00694"></a><span class="lineno"> 694</span><span class="comment">*</span></div>
<div class="line"><a id="l00695" name="l00695"></a><span class="lineno"> 695</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00696" name="l00696"></a><span class="lineno"> 696</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00697" name="l00697"></a><span class="lineno"> 697</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00698" name="l00698"></a><span class="lineno"> 698</span><span class="comment">* 1: Null disprm pointer passed.</span></div>
<div class="line"><a id="l00699" name="l00699"></a><span class="lineno"> 699</span><span class="comment">* 2: Memory allocation failed.</span></div>
<div class="line"><a id="l00700" name="l00700"></a><span class="lineno"> 700</span><span class="comment">* 3: Invalid parameter.</span></div>
<div class="line"><a id="l00701" name="l00701"></a><span class="lineno"> 701</span><span class="comment">* 4: Distort error.</span></div>
<div class="line"><a id="l00702" name="l00702"></a><span class="lineno"> 702</span><span class="comment">*</span></div>
<div class="line"><a id="l00703" name="l00703"></a><span class="lineno"> 703</span><span class="comment">* For returns > 1, a detailed error message is set in</span></div>
<div class="line"><a id="l00704" name="l00704"></a><span class="lineno"> 704</span><span class="comment">* disprm::err if enabled, see wcserr_enable().</span></div>
<div class="line"><a id="l00705" name="l00705"></a><span class="lineno"> 705</span><span class="comment">*</span></div>
<div class="line"><a id="l00706" name="l00706"></a><span class="lineno"> 706</span><span class="comment">*</span></div>
<div class="line"><a id="l00707" name="l00707"></a><span class="lineno"> 707</span><span class="comment">* disx2p() - Apply de-distortion function</span></div>
<div class="line"><a id="l00708" name="l00708"></a><span class="lineno"> 708</span><span class="comment">* ---------------------------------------</span></div>
<div class="line"><a id="l00709" name="l00709"></a><span class="lineno"> 709</span><span class="comment">* disx2p() applies the inverse of the distortion functions. By definition,</span></div>
<div class="line"><a id="l00710" name="l00710"></a><span class="lineno"> 710</span><span class="comment">* the de-distortion is in the world-to-pixel direction.</span></div>
<div class="line"><a id="l00711" name="l00711"></a><span class="lineno"> 711</span><span class="comment">*</span></div>
<div class="line"><a id="l00712" name="l00712"></a><span class="lineno"> 712</span><span class="comment">* Depending on the point in the algorithm chain at which it is invoked,</span></div>
<div class="line"><a id="l00713" name="l00713"></a><span class="lineno"> 713</span><span class="comment">* disx2p() may transform corrected pixel coordinates to pixel coordinates, or</span></div>
<div class="line"><a id="l00714" name="l00714"></a><span class="lineno"> 714</span><span class="comment">* corrected intermediate pixel coordinates to intermediate pixel coordinates,</span></div>
<div class="line"><a id="l00715" name="l00715"></a><span class="lineno"> 715</span><span class="comment">* or corrected image coordinates to image coordinates.</span></div>
<div class="line"><a id="l00716" name="l00716"></a><span class="lineno"> 716</span><span class="comment">*</span></div>
<div class="line"><a id="l00717" name="l00717"></a><span class="lineno"> 717</span><span class="comment">* disx2p() iteratively solves for the inverse using disp2x(). It assumes</span></div>
<div class="line"><a id="l00718" name="l00718"></a><span class="lineno"> 718</span><span class="comment">* that the distortion is small and the functions are well-behaved, being</span></div>
<div class="line"><a id="l00719" name="l00719"></a><span class="lineno"> 719</span><span class="comment">* continuous and with continuous derivatives. Also that, to first order</span></div>
<div class="line"><a id="l00720" name="l00720"></a><span class="lineno"> 720</span><span class="comment">* in the neighbourhood of the solution, discrd[j] ~= a + b*rawcrd[j], i.e.</span></div>
<div class="line"><a id="l00721" name="l00721"></a><span class="lineno"> 721</span><span class="comment">* independent of rawcrd[i], where i != j. This is effectively equivalent to</span></div>
<div class="line"><a id="l00722" name="l00722"></a><span class="lineno"> 722</span><span class="comment">* assuming that the distortion functions are separable to first order.</span></div>
<div class="line"><a id="l00723" name="l00723"></a><span class="lineno"> 723</span><span class="comment">* Furthermore, a is assumed to be small, and b close to unity.</span></div>
<div class="line"><a id="l00724" name="l00724"></a><span class="lineno"> 724</span><span class="comment">*</span></div>
<div class="line"><a id="l00725" name="l00725"></a><span class="lineno"> 725</span><span class="comment">* If disprm::disx2p() is defined, then disx2p() uses it to provide an initial</span></div>
<div class="line"><a id="l00726" name="l00726"></a><span class="lineno"> 726</span><span class="comment">* estimate for its more precise iterative inversion.</span></div>
<div class="line"><a id="l00727" name="l00727"></a><span class="lineno"> 727</span><span class="comment">*</span></div>
<div class="line"><a id="l00728" name="l00728"></a><span class="lineno"> 728</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00729" name="l00729"></a><span class="lineno"> 729</span><span class="comment">* dis struct disprm*</span></div>
<div class="line"><a id="l00730" name="l00730"></a><span class="lineno"> 730</span><span class="comment">* Distortion function parameters.</span></div>
<div class="line"><a id="l00731" name="l00731"></a><span class="lineno"> 731</span><span class="comment">*</span></div>
<div class="line"><a id="l00732" name="l00732"></a><span class="lineno"> 732</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00733" name="l00733"></a><span class="lineno"> 733</span><span class="comment">* discrd const double[naxis]</span></div>
<div class="line"><a id="l00734" name="l00734"></a><span class="lineno"> 734</span><span class="comment">* Array of coordinates.</span></div>
<div class="line"><a id="l00735" name="l00735"></a><span class="lineno"> 735</span><span class="comment">*</span></div>
<div class="line"><a id="l00736" name="l00736"></a><span class="lineno"> 736</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00737" name="l00737"></a><span class="lineno"> 737</span><span class="comment">* rawcrd double[naxis]</span></div>
<div class="line"><a id="l00738" name="l00738"></a><span class="lineno"> 738</span><span class="comment">* Array of coordinates to which the inverse distortion</span></div>
<div class="line"><a id="l00739" name="l00739"></a><span class="lineno"> 739</span><span class="comment">* functions have been applied.</span></div>
<div class="line"><a id="l00740" name="l00740"></a><span class="lineno"> 740</span><span class="comment">*</span></div>
<div class="line"><a id="l00741" name="l00741"></a><span class="lineno"> 741</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00742" name="l00742"></a><span class="lineno"> 742</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00743" name="l00743"></a><span class="lineno"> 743</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00744" name="l00744"></a><span class="lineno"> 744</span><span class="comment">* 1: Null disprm pointer passed.</span></div>
<div class="line"><a id="l00745" name="l00745"></a><span class="lineno"> 745</span><span class="comment">* 2: Memory allocation failed.</span></div>
<div class="line"><a id="l00746" name="l00746"></a><span class="lineno"> 746</span><span class="comment">* 3: Invalid parameter.</span></div>
<div class="line"><a id="l00747" name="l00747"></a><span class="lineno"> 747</span><span class="comment">* 5: De-distort error.</span></div>
<div class="line"><a id="l00748" name="l00748"></a><span class="lineno"> 748</span><span class="comment">*</span></div>
<div class="line"><a id="l00749" name="l00749"></a><span class="lineno"> 749</span><span class="comment">* For returns > 1, a detailed error message is set in</span></div>
<div class="line"><a id="l00750" name="l00750"></a><span class="lineno"> 750</span><span class="comment">* disprm::err if enabled, see wcserr_enable().</span></div>
<div class="line"><a id="l00751" name="l00751"></a><span class="lineno"> 751</span><span class="comment">*</span></div>
<div class="line"><a id="l00752" name="l00752"></a><span class="lineno"> 752</span><span class="comment">*</span></div>
<div class="line"><a id="l00753" name="l00753"></a><span class="lineno"> 753</span><span class="comment">* diswarp() - Compute measures of distortion</span></div>
<div class="line"><a id="l00754" name="l00754"></a><span class="lineno"> 754</span><span class="comment">* ------------------------------------------</span></div>
<div class="line"><a id="l00755" name="l00755"></a><span class="lineno"> 755</span><span class="comment">* diswarp() computes various measures of the distortion over a specified range</span></div>
<div class="line"><a id="l00756" name="l00756"></a><span class="lineno"> 756</span><span class="comment">* of coordinates.</span></div>
<div class="line"><a id="l00757" name="l00757"></a><span class="lineno"> 757</span><span class="comment">*</span></div>
<div class="line"><a id="l00758" name="l00758"></a><span class="lineno"> 758</span><span class="comment">* For prior distortions, the measures may be interpreted simply as an offset</span></div>
<div class="line"><a id="l00759" name="l00759"></a><span class="lineno"> 759</span><span class="comment">* in pixel coordinates. For sequent distortions, the interpretation depends</span></div>
<div class="line"><a id="l00760" name="l00760"></a><span class="lineno"> 760</span><span class="comment">* on the nature of the linear transformation matrix (PCi_ja or CDi_ja). If</span></div>
<div class="line"><a id="l00761" name="l00761"></a><span class="lineno"> 761</span><span class="comment">* the latter introduces a scaling, then the measures will also be scaled.</span></div>
<div class="line"><a id="l00762" name="l00762"></a><span class="lineno"> 762</span><span class="comment">* Note also that the image domain, which is rectangular in pixel coordinates,</span></div>
<div class="line"><a id="l00763" name="l00763"></a><span class="lineno"> 763</span><span class="comment">* may be rotated, skewed, and/or stretched in intermediate pixel coordinates,</span></div>
<div class="line"><a id="l00764" name="l00764"></a><span class="lineno"> 764</span><span class="comment">* and in general cannot be defined using pixblc[] and pixtrc[].</span></div>
<div class="line"><a id="l00765" name="l00765"></a><span class="lineno"> 765</span><span class="comment">*</span></div>
<div class="line"><a id="l00766" name="l00766"></a><span class="lineno"> 766</span><span class="comment">* PLEASE NOTE: the measures of total distortion may be essentially meaningless</span></div>
<div class="line"><a id="l00767" name="l00767"></a><span class="lineno"> 767</span><span class="comment">* if there are multiple sequent distortions with different scaling.</span></div>
<div class="line"><a id="l00768" name="l00768"></a><span class="lineno"> 768</span><span class="comment">*</span></div>
<div class="line"><a id="l00769" name="l00769"></a><span class="lineno"> 769</span><span class="comment">* See also linwarp().</span></div>
<div class="line"><a id="l00770" name="l00770"></a><span class="lineno"> 770</span><span class="comment">*</span></div>
<div class="line"><a id="l00771" name="l00771"></a><span class="lineno"> 771</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00772" name="l00772"></a><span class="lineno"> 772</span><span class="comment">* dis struct disprm*</span></div>
<div class="line"><a id="l00773" name="l00773"></a><span class="lineno"> 773</span><span class="comment">* Distortion function parameters.</span></div>
<div class="line"><a id="l00774" name="l00774"></a><span class="lineno"> 774</span><span class="comment">*</span></div>
<div class="line"><a id="l00775" name="l00775"></a><span class="lineno"> 775</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00776" name="l00776"></a><span class="lineno"> 776</span><span class="comment">* pixblc const double[naxis]</span></div>
<div class="line"><a id="l00777" name="l00777"></a><span class="lineno"> 777</span><span class="comment">* Start of the range of pixel coordinates (for prior</span></div>
<div class="line"><a id="l00778" name="l00778"></a><span class="lineno"> 778</span><span class="comment">* distortions), or intermediate pixel coordinates (for</span></div>
<div class="line"><a id="l00779" name="l00779"></a><span class="lineno"> 779</span><span class="comment">* sequent distortions). May be specified as a NULL</span></div>
<div class="line"><a id="l00780" name="l00780"></a><span class="lineno"> 780</span><span class="comment">* pointer which is interpreted as (1,1,...).</span></div>
<div class="line"><a id="l00781" name="l00781"></a><span class="lineno"> 781</span><span class="comment">*</span></div>
<div class="line"><a id="l00782" name="l00782"></a><span class="lineno"> 782</span><span class="comment">* pixtrc const double[naxis]</span></div>
<div class="line"><a id="l00783" name="l00783"></a><span class="lineno"> 783</span><span class="comment">* End of the range of pixel coordinates (prior) or</span></div>
<div class="line"><a id="l00784" name="l00784"></a><span class="lineno"> 784</span><span class="comment">* intermediate pixel coordinates (sequent).</span></div>
<div class="line"><a id="l00785" name="l00785"></a><span class="lineno"> 785</span><span class="comment">*</span></div>
<div class="line"><a id="l00786" name="l00786"></a><span class="lineno"> 786</span><span class="comment">* pixsamp const double[naxis]</span></div>
<div class="line"><a id="l00787" name="l00787"></a><span class="lineno"> 787</span><span class="comment">* If positive or zero, the increment on the particular</span></div>
<div class="line"><a id="l00788" name="l00788"></a><span class="lineno"> 788</span><span class="comment">* axis, starting at pixblc[]. Zero is interpreted as a</span></div>
<div class="line"><a id="l00789" name="l00789"></a><span class="lineno"> 789</span><span class="comment">* unit increment. pixsamp may also be specified as a</span></div>
<div class="line"><a id="l00790" name="l00790"></a><span class="lineno"> 790</span><span class="comment">* NULL pointer which is interpreted as all zeroes, i.e.</span></div>
<div class="line"><a id="l00791" name="l00791"></a><span class="lineno"> 791</span><span class="comment">* unit increments on all axes.</span></div>
<div class="line"><a id="l00792" name="l00792"></a><span class="lineno"> 792</span><span class="comment">*</span></div>
<div class="line"><a id="l00793" name="l00793"></a><span class="lineno"> 793</span><span class="comment">* If negative, the grid size on the particular axis (the</span></div>
<div class="line"><a id="l00794" name="l00794"></a><span class="lineno"> 794</span><span class="comment">* absolute value being rounded to the nearest integer).</span></div>
<div class="line"><a id="l00795" name="l00795"></a><span class="lineno"> 795</span><span class="comment">* For example, if pixsamp is (-128.0,-128.0,...) then</span></div>
<div class="line"><a id="l00796" name="l00796"></a><span class="lineno"> 796</span><span class="comment">* each axis will be sampled at 128 points between</span></div>
<div class="line"><a id="l00797" name="l00797"></a><span class="lineno"> 797</span><span class="comment">* pixblc[] and pixtrc[] inclusive. Use caution when</span></div>
<div class="line"><a id="l00798" name="l00798"></a><span class="lineno"> 798</span><span class="comment">* using this option on non-square images.</span></div>
<div class="line"><a id="l00799" name="l00799"></a><span class="lineno"> 799</span><span class="comment">*</span></div>
<div class="line"><a id="l00800" name="l00800"></a><span class="lineno"> 800</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00801" name="l00801"></a><span class="lineno"> 801</span><span class="comment">* nsamp int* The number of pixel coordinates sampled.</span></div>
<div class="line"><a id="l00802" name="l00802"></a><span class="lineno"> 802</span><span class="comment">*</span></div>
<div class="line"><a id="l00803" name="l00803"></a><span class="lineno"> 803</span><span class="comment">* Can be specified as a NULL pointer if not required.</span></div>
<div class="line"><a id="l00804" name="l00804"></a><span class="lineno"> 804</span><span class="comment">*</span></div>
<div class="line"><a id="l00805" name="l00805"></a><span class="lineno"> 805</span><span class="comment">* maxdis double[naxis]</span></div>
<div class="line"><a id="l00806" name="l00806"></a><span class="lineno"> 806</span><span class="comment">* For each individual distortion function, the</span></div>
<div class="line"><a id="l00807" name="l00807"></a><span class="lineno"> 807</span><span class="comment">* maximum absolute value of the distortion.</span></div>
<div class="line"><a id="l00808" name="l00808"></a><span class="lineno"> 808</span><span class="comment">*</span></div>
<div class="line"><a id="l00809" name="l00809"></a><span class="lineno"> 809</span><span class="comment">* Can be specified as a NULL pointer if not required.</span></div>
<div class="line"><a id="l00810" name="l00810"></a><span class="lineno"> 810</span><span class="comment">*</span></div>
<div class="line"><a id="l00811" name="l00811"></a><span class="lineno"> 811</span><span class="comment">* maxtot double* For the combination of all distortion functions, the</span></div>
<div class="line"><a id="l00812" name="l00812"></a><span class="lineno"> 812</span><span class="comment">* maximum absolute value of the distortion.</span></div>
<div class="line"><a id="l00813" name="l00813"></a><span class="lineno"> 813</span><span class="comment">*</span></div>
<div class="line"><a id="l00814" name="l00814"></a><span class="lineno"> 814</span><span class="comment">* Can be specified as a NULL pointer if not required.</span></div>
<div class="line"><a id="l00815" name="l00815"></a><span class="lineno"> 815</span><span class="comment">*</span></div>
<div class="line"><a id="l00816" name="l00816"></a><span class="lineno"> 816</span><span class="comment">* avgdis double[naxis]</span></div>
<div class="line"><a id="l00817" name="l00817"></a><span class="lineno"> 817</span><span class="comment">* For each individual distortion function, the</span></div>
<div class="line"><a id="l00818" name="l00818"></a><span class="lineno"> 818</span><span class="comment">* mean value of the distortion.</span></div>
<div class="line"><a id="l00819" name="l00819"></a><span class="lineno"> 819</span><span class="comment">*</span></div>
<div class="line"><a id="l00820" name="l00820"></a><span class="lineno"> 820</span><span class="comment">* Can be specified as a NULL pointer if not required.</span></div>
<div class="line"><a id="l00821" name="l00821"></a><span class="lineno"> 821</span><span class="comment">*</span></div>
<div class="line"><a id="l00822" name="l00822"></a><span class="lineno"> 822</span><span class="comment">* avgtot double* For the combination of all distortion functions, the</span></div>
<div class="line"><a id="l00823" name="l00823"></a><span class="lineno"> 823</span><span class="comment">* mean value of the distortion.</span></div>
<div class="line"><a id="l00824" name="l00824"></a><span class="lineno"> 824</span><span class="comment">*</span></div>
<div class="line"><a id="l00825" name="l00825"></a><span class="lineno"> 825</span><span class="comment">* Can be specified as a NULL pointer if not required.</span></div>
<div class="line"><a id="l00826" name="l00826"></a><span class="lineno"> 826</span><span class="comment">*</span></div>
<div class="line"><a id="l00827" name="l00827"></a><span class="lineno"> 827</span><span class="comment">* rmsdis double[naxis]</span></div>
<div class="line"><a id="l00828" name="l00828"></a><span class="lineno"> 828</span><span class="comment">* For each individual distortion function, the</span></div>
<div class="line"><a id="l00829" name="l00829"></a><span class="lineno"> 829</span><span class="comment">* root mean square deviation of the distortion.</span></div>
<div class="line"><a id="l00830" name="l00830"></a><span class="lineno"> 830</span><span class="comment">*</span></div>
<div class="line"><a id="l00831" name="l00831"></a><span class="lineno"> 831</span><span class="comment">* Can be specified as a NULL pointer if not required.</span></div>
<div class="line"><a id="l00832" name="l00832"></a><span class="lineno"> 832</span><span class="comment">*</span></div>
<div class="line"><a id="l00833" name="l00833"></a><span class="lineno"> 833</span><span class="comment">* rmstot double* For the combination of all distortion functions, the</span></div>
<div class="line"><a id="l00834" name="l00834"></a><span class="lineno"> 834</span><span class="comment">* root mean square deviation of the distortion.</span></div>
<div class="line"><a id="l00835" name="l00835"></a><span class="lineno"> 835</span><span class="comment">*</span></div>
<div class="line"><a id="l00836" name="l00836"></a><span class="lineno"> 836</span><span class="comment">* Can be specified as a NULL pointer if not required.</span></div>
<div class="line"><a id="l00837" name="l00837"></a><span class="lineno"> 837</span><span class="comment">*</span></div>
<div class="line"><a id="l00838" name="l00838"></a><span class="lineno"> 838</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00839" name="l00839"></a><span class="lineno"> 839</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00840" name="l00840"></a><span class="lineno"> 840</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00841" name="l00841"></a><span class="lineno"> 841</span><span class="comment">* 1: Null disprm pointer passed.</span></div>
<div class="line"><a id="l00842" name="l00842"></a><span class="lineno"> 842</span><span class="comment">* 2: Memory allocation failed.</span></div>
<div class="line"><a id="l00843" name="l00843"></a><span class="lineno"> 843</span><span class="comment">* 3: Invalid parameter.</span></div>
<div class="line"><a id="l00844" name="l00844"></a><span class="lineno"> 844</span><span class="comment">* 4: Distort error.</span></div>
<div class="line"><a id="l00845" name="l00845"></a><span class="lineno"> 845</span><span class="comment">*</span></div>
<div class="line"><a id="l00846" name="l00846"></a><span class="lineno"> 846</span><span class="comment">*</span></div>
<div class="line"><a id="l00847" name="l00847"></a><span class="lineno"> 847</span><span class="comment">* disprm struct - Distortion parameters</span></div>
<div class="line"><a id="l00848" name="l00848"></a><span class="lineno"> 848</span><span class="comment">* -------------------------------------</span></div>
<div class="line"><a id="l00849" name="l00849"></a><span class="lineno"> 849</span><span class="comment">* The disprm struct contains all of the information required to apply a set of</span></div>
<div class="line"><a id="l00850" name="l00850"></a><span class="lineno"> 850</span><span class="comment">* distortion functions. It consists of certain members that must be set by</span></div>
<div class="line"><a id="l00851" name="l00851"></a><span class="lineno"> 851</span><span class="comment">* the user ("given") and others that are set by the WCSLIB routines</span></div>
<div class="line"><a id="l00852" name="l00852"></a><span class="lineno"> 852</span><span class="comment">* ("returned"). While the addresses of the arrays themselves may be set by</span></div>
<div class="line"><a id="l00853" name="l00853"></a><span class="lineno"> 853</span><span class="comment">* disinit() if it (optionally) allocates memory, their contents must be set by</span></div>
<div class="line"><a id="l00854" name="l00854"></a><span class="lineno"> 854</span><span class="comment">* the user.</span></div>
<div class="line"><a id="l00855" name="l00855"></a><span class="lineno"> 855</span><span class="comment">*</span></div>
<div class="line"><a id="l00856" name="l00856"></a><span class="lineno"> 856</span><span class="comment">* int flag</span></div>
<div class="line"><a id="l00857" name="l00857"></a><span class="lineno"> 857</span><span class="comment">* (Given and returned) This flag must be set to zero whenever any of the</span></div>
<div class="line"><a id="l00858" name="l00858"></a><span class="lineno"> 858</span><span class="comment">* following members of the disprm struct are set or modified:</span></div>
<div class="line"><a id="l00859" name="l00859"></a><span class="lineno"> 859</span><span class="comment">*</span></div>
<div class="line"><a id="l00860" name="l00860"></a><span class="lineno"> 860</span><span class="comment">* - disprm::naxis,</span></div>
<div class="line"><a id="l00861" name="l00861"></a><span class="lineno"> 861</span><span class="comment">* - disprm::dtype,</span></div>
<div class="line"><a id="l00862" name="l00862"></a><span class="lineno"> 862</span><span class="comment">* - disprm::ndp,</span></div>
<div class="line"><a id="l00863" name="l00863"></a><span class="lineno"> 863</span><span class="comment">* - disprm::dp.</span></div>
<div class="line"><a id="l00864" name="l00864"></a><span class="lineno"> 864</span><span class="comment">*</span></div>
<div class="line"><a id="l00865" name="l00865"></a><span class="lineno"> 865</span><span class="comment">* This signals the initialization routine, disset(), to recompute the</span></div>
<div class="line"><a id="l00866" name="l00866"></a><span class="lineno"> 866</span><span class="comment">* returned members of the disprm struct. disset() will reset flag to</span></div>
<div class="line"><a id="l00867" name="l00867"></a><span class="lineno"> 867</span><span class="comment">* indicate that this has been done.</span></div>
<div class="line"><a id="l00868" name="l00868"></a><span class="lineno"> 868</span><span class="comment">*</span></div>
<div class="line"><a id="l00869" name="l00869"></a><span class="lineno"> 869</span><span class="comment">* PLEASE NOTE: flag must be set to -1 when disinit() is called for the</span></div>
<div class="line"><a id="l00870" name="l00870"></a><span class="lineno"> 870</span><span class="comment">* first time for a particular disprm struct in order to initialize memory</span></div>
<div class="line"><a id="l00871" name="l00871"></a><span class="lineno"> 871</span><span class="comment">* management. It must ONLY be used on the first initialization otherwise</span></div>
<div class="line"><a id="l00872" name="l00872"></a><span class="lineno"> 872</span><span class="comment">* memory leaks may result.</span></div>
<div class="line"><a id="l00873" name="l00873"></a><span class="lineno"> 873</span><span class="comment">*</span></div>
<div class="line"><a id="l00874" name="l00874"></a><span class="lineno"> 874</span><span class="comment">* int naxis</span></div>
<div class="line"><a id="l00875" name="l00875"></a><span class="lineno"> 875</span><span class="comment">* (Given or returned) Number of pixel and world coordinate elements.</span></div>
<div class="line"><a id="l00876" name="l00876"></a><span class="lineno"> 876</span><span class="comment">*</span></div>
<div class="line"><a id="l00877" name="l00877"></a><span class="lineno"> 877</span><span class="comment">* If disinit() is used to initialize the disprm struct (as would normally</span></div>
<div class="line"><a id="l00878" name="l00878"></a><span class="lineno"> 878</span><span class="comment">* be the case) then it will set naxis from the value passed to it as a</span></div>
<div class="line"><a id="l00879" name="l00879"></a><span class="lineno"> 879</span><span class="comment">* function argument. The user should not subsequently modify it.</span></div>
<div class="line"><a id="l00880" name="l00880"></a><span class="lineno"> 880</span><span class="comment">*</span></div>
<div class="line"><a id="l00881" name="l00881"></a><span class="lineno"> 881</span><span class="comment">* char (*dtype)[72]</span></div>
<div class="line"><a id="l00882" name="l00882"></a><span class="lineno"> 882</span><span class="comment">* (Given) Pointer to the first element of an array of char[72] containing</span></div>
<div class="line"><a id="l00883" name="l00883"></a><span class="lineno"> 883</span><span class="comment">* the name of the distortion function for each axis.</span></div>
<div class="line"><a id="l00884" name="l00884"></a><span class="lineno"> 884</span><span class="comment">*</span></div>
<div class="line"><a id="l00885" name="l00885"></a><span class="lineno"> 885</span><span class="comment">* int ndp</span></div>
<div class="line"><a id="l00886" name="l00886"></a><span class="lineno"> 886</span><span class="comment">* (Given) The number of entries in the disprm::dp[] array.</span></div>
<div class="line"><a id="l00887" name="l00887"></a><span class="lineno"> 887</span><span class="comment">*</span></div>
<div class="line"><a id="l00888" name="l00888"></a><span class="lineno"> 888</span><span class="comment">* int ndpmax</span></div>
<div class="line"><a id="l00889" name="l00889"></a><span class="lineno"> 889</span><span class="comment">* (Given) The length of the disprm::dp[] array.</span></div>
<div class="line"><a id="l00890" name="l00890"></a><span class="lineno"> 890</span><span class="comment">*</span></div>
<div class="line"><a id="l00891" name="l00891"></a><span class="lineno"> 891</span><span class="comment">* ndpmax will be set by disinit() if it allocates memory for disprm::dp[],</span></div>
<div class="line"><a id="l00892" name="l00892"></a><span class="lineno"> 892</span><span class="comment">* otherwise it must be set by the user. See also disndp().</span></div>
<div class="line"><a id="l00893" name="l00893"></a><span class="lineno"> 893</span><span class="comment">*</span></div>
<div class="line"><a id="l00894" name="l00894"></a><span class="lineno"> 894</span><span class="comment">* struct dpkey dp</span></div>
<div class="line"><a id="l00895" name="l00895"></a><span class="lineno"> 895</span><span class="comment">* (Given) Address of the first element of an array of length ndpmax of</span></div>
<div class="line"><a id="l00896" name="l00896"></a><span class="lineno"> 896</span><span class="comment">* dpkey structs.</span></div>
<div class="line"><a id="l00897" name="l00897"></a><span class="lineno"> 897</span><span class="comment">*</span></div>
<div class="line"><a id="l00898" name="l00898"></a><span class="lineno"> 898</span><span class="comment">* As a FITS header parser encounters each DPja or DQia keyword it should</span></div>
<div class="line"><a id="l00899" name="l00899"></a><span class="lineno"> 899</span><span class="comment">* load it into a dpkey struct in the array and increment ndp. However,</span></div>
<div class="line"><a id="l00900" name="l00900"></a><span class="lineno"> 900</span><span class="comment">* note that a single disprm struct must hold only DPja or DQia keyvalues,</span></div>
<div class="line"><a id="l00901" name="l00901"></a><span class="lineno"> 901</span><span class="comment">* not both. disset() interprets them as required by the particular</span></div>
<div class="line"><a id="l00902" name="l00902"></a><span class="lineno"> 902</span><span class="comment">* distortion function.</span></div>
<div class="line"><a id="l00903" name="l00903"></a><span class="lineno"> 903</span><span class="comment">*</span></div>
<div class="line"><a id="l00904" name="l00904"></a><span class="lineno"> 904</span><span class="comment">* double *maxdis</span></div>
<div class="line"><a id="l00905" name="l00905"></a><span class="lineno"> 905</span><span class="comment">* (Given) Pointer to the first element of an array of double specifying</span></div>
<div class="line"><a id="l00906" name="l00906"></a><span class="lineno"> 906</span><span class="comment">* the maximum absolute value of the distortion for each axis computed over</span></div>
<div class="line"><a id="l00907" name="l00907"></a><span class="lineno"> 907</span><span class="comment">* the whole image.</span></div>
<div class="line"><a id="l00908" name="l00908"></a><span class="lineno"> 908</span><span class="comment">*</span></div>
<div class="line"><a id="l00909" name="l00909"></a><span class="lineno"> 909</span><span class="comment">* It is not necessary to reset the disprm struct (via disset()) when</span></div>
<div class="line"><a id="l00910" name="l00910"></a><span class="lineno"> 910</span><span class="comment">* disprm::maxdis is changed.</span></div>
<div class="line"><a id="l00911" name="l00911"></a><span class="lineno"> 911</span><span class="comment">*</span></div>
<div class="line"><a id="l00912" name="l00912"></a><span class="lineno"> 912</span><span class="comment">* double totdis</span></div>
<div class="line"><a id="l00913" name="l00913"></a><span class="lineno"> 913</span><span class="comment">* (Given) The maximum absolute value of the combination of all distortion</span></div>
<div class="line"><a id="l00914" name="l00914"></a><span class="lineno"> 914</span><span class="comment">* functions specified as an offset in pixel coordinates computed over the</span></div>
<div class="line"><a id="l00915" name="l00915"></a><span class="lineno"> 915</span><span class="comment">* whole image.</span></div>
<div class="line"><a id="l00916" name="l00916"></a><span class="lineno"> 916</span><span class="comment">*</span></div>
<div class="line"><a id="l00917" name="l00917"></a><span class="lineno"> 917</span><span class="comment">* It is not necessary to reset the disprm struct (via disset()) when</span></div>
<div class="line"><a id="l00918" name="l00918"></a><span class="lineno"> 918</span><span class="comment">* disprm::totdis is changed.</span></div>
<div class="line"><a id="l00919" name="l00919"></a><span class="lineno"> 919</span><span class="comment">*</span></div>
<div class="line"><a id="l00920" name="l00920"></a><span class="lineno"> 920</span><span class="comment">* int *docorr</span></div>
<div class="line"><a id="l00921" name="l00921"></a><span class="lineno"> 921</span><span class="comment">* (Returned) Pointer to the first element of an array of int containing</span></div>
<div class="line"><a id="l00922" name="l00922"></a><span class="lineno"> 922</span><span class="comment">* flags that indicate the mode of correction for each axis.</span></div>
<div class="line"><a id="l00923" name="l00923"></a><span class="lineno"> 923</span><span class="comment">*</span></div>
<div class="line"><a id="l00924" name="l00924"></a><span class="lineno"> 924</span><span class="comment">* If docorr is zero, the distortion function returns the corrected</span></div>
<div class="line"><a id="l00925" name="l00925"></a><span class="lineno"> 925</span><span class="comment">* coordinates directly. Any other value indicates that the distortion</span></div>
<div class="line"><a id="l00926" name="l00926"></a><span class="lineno"> 926</span><span class="comment">* function computes a correction to be added to pixel coordinates (prior</span></div>
<div class="line"><a id="l00927" name="l00927"></a><span class="lineno"> 927</span><span class="comment">* distortion) or intermediate pixel coordinates (sequent distortion).</span></div>
<div class="line"><a id="l00928" name="l00928"></a><span class="lineno"> 928</span><span class="comment">*</span></div>
<div class="line"><a id="l00929" name="l00929"></a><span class="lineno"> 929</span><span class="comment">* int *Nhat</span></div>
<div class="line"><a id="l00930" name="l00930"></a><span class="lineno"> 930</span><span class="comment">* (Returned) Pointer to the first element of an array of int containing</span></div>
<div class="line"><a id="l00931" name="l00931"></a><span class="lineno"> 931</span><span class="comment">* the number of coordinate axes that form the independent variables of the</span></div>
<div class="line"><a id="l00932" name="l00932"></a><span class="lineno"> 932</span><span class="comment">* distortion function for each axis.</span></div>
<div class="line"><a id="l00933" name="l00933"></a><span class="lineno"> 933</span><span class="comment">*</span></div>
<div class="line"><a id="l00934" name="l00934"></a><span class="lineno"> 934</span><span class="comment">* int **axmap</span></div>
<div class="line"><a id="l00935" name="l00935"></a><span class="lineno"> 935</span><span class="comment">* (Returned) Pointer to the first element of an array of int* containing</span></div>
<div class="line"><a id="l00936" name="l00936"></a><span class="lineno"> 936</span><span class="comment">* pointers to the first elements of the axis mapping arrays for each axis.</span></div>
<div class="line"><a id="l00937" name="l00937"></a><span class="lineno"> 937</span><span class="comment">*</span></div>
<div class="line"><a id="l00938" name="l00938"></a><span class="lineno"> 938</span><span class="comment">* An axis mapping associates the independent variables of a distortion</span></div>
<div class="line"><a id="l00939" name="l00939"></a><span class="lineno"> 939</span><span class="comment">* function with the 0-relative image axis number. For example, consider</span></div>
<div class="line"><a id="l00940" name="l00940"></a><span class="lineno"> 940</span><span class="comment">* an image with a spectrum on the first axis (axis 0), followed by RA</span></div>
<div class="line"><a id="l00941" name="l00941"></a><span class="lineno"> 941</span><span class="comment">* (axis 1), Dec (axis2), and time (axis 3) axes. For a distortion in</span></div>
<div class="line"><a id="l00942" name="l00942"></a><span class="lineno"> 942</span><span class="comment">* (RA,Dec) and no distortion on the spectral or time axes, the axis</span></div>
<div class="line"><a id="l00943" name="l00943"></a><span class="lineno"> 943</span><span class="comment">* mapping arrays, axmap[j][], would be</span></div>
<div class="line"><a id="l00944" name="l00944"></a><span class="lineno"> 944</span><span class="comment">*</span></div>
<div class="line"><a id="l00945" name="l00945"></a><span class="lineno"> 945</span><span class="comment">= j=0: [-1, -1, -1, -1] ...no distortion on spectral axis,</span></div>
<div class="line"><a id="l00946" name="l00946"></a><span class="lineno"> 946</span><span class="comment">= 1: [ 1, 2, -1, -1] ...RA distortion depends on RA and Dec,</span></div>
<div class="line"><a id="l00947" name="l00947"></a><span class="lineno"> 947</span><span class="comment">= 2: [ 2, 1, -1, -1] ...Dec distortion depends on Dec and RA,</span></div>
<div class="line"><a id="l00948" name="l00948"></a><span class="lineno"> 948</span><span class="comment">= 3: [-1, -1, -1, -1] ...no distortion on time axis,</span></div>
<div class="line"><a id="l00949" name="l00949"></a><span class="lineno"> 949</span><span class="comment">*</span></div>
<div class="line"><a id="l00950" name="l00950"></a><span class="lineno"> 950</span><span class="comment">* where -1 indicates that there is no corresponding independent</span></div>
<div class="line"><a id="l00951" name="l00951"></a><span class="lineno"> 951</span><span class="comment">* variable.</span></div>
<div class="line"><a id="l00952" name="l00952"></a><span class="lineno"> 952</span><span class="comment">*</span></div>
<div class="line"><a id="l00953" name="l00953"></a><span class="lineno"> 953</span><span class="comment">* double **offset</span></div>
<div class="line"><a id="l00954" name="l00954"></a><span class="lineno"> 954</span><span class="comment">* (Returned) Pointer to the first element of an array of double*</span></div>
<div class="line"><a id="l00955" name="l00955"></a><span class="lineno"> 955</span><span class="comment">* containing pointers to the first elements of arrays of offsets used to</span></div>
<div class="line"><a id="l00956" name="l00956"></a><span class="lineno"> 956</span><span class="comment">* renormalize the independent variables of the distortion function for</span></div>
<div class="line"><a id="l00957" name="l00957"></a><span class="lineno"> 957</span><span class="comment">* each axis.</span></div>
<div class="line"><a id="l00958" name="l00958"></a><span class="lineno"> 958</span><span class="comment">*</span></div>
<div class="line"><a id="l00959" name="l00959"></a><span class="lineno"> 959</span><span class="comment">* The offsets are subtracted from the independent variables before</span></div>
<div class="line"><a id="l00960" name="l00960"></a><span class="lineno"> 960</span><span class="comment">* scaling.</span></div>
<div class="line"><a id="l00961" name="l00961"></a><span class="lineno"> 961</span><span class="comment">*</span></div>
<div class="line"><a id="l00962" name="l00962"></a><span class="lineno"> 962</span><span class="comment">* double **scale</span></div>
<div class="line"><a id="l00963" name="l00963"></a><span class="lineno"> 963</span><span class="comment">* (Returned) Pointer to the first element of an array of double*</span></div>
<div class="line"><a id="l00964" name="l00964"></a><span class="lineno"> 964</span><span class="comment">* containing pointers to the first elements of arrays of scales used to</span></div>
<div class="line"><a id="l00965" name="l00965"></a><span class="lineno"> 965</span><span class="comment">* renormalize the independent variables of the distortion function for</span></div>
<div class="line"><a id="l00966" name="l00966"></a><span class="lineno"> 966</span><span class="comment">* each axis.</span></div>
<div class="line"><a id="l00967" name="l00967"></a><span class="lineno"> 967</span><span class="comment">*</span></div>
<div class="line"><a id="l00968" name="l00968"></a><span class="lineno"> 968</span><span class="comment">* The scale is applied to the independent variables after the offsets are</span></div>
<div class="line"><a id="l00969" name="l00969"></a><span class="lineno"> 969</span><span class="comment">* subtracted.</span></div>
<div class="line"><a id="l00970" name="l00970"></a><span class="lineno"> 970</span><span class="comment">*</span></div>
<div class="line"><a id="l00971" name="l00971"></a><span class="lineno"> 971</span><span class="comment">* int **iparm</span></div>
<div class="line"><a id="l00972" name="l00972"></a><span class="lineno"> 972</span><span class="comment">* (Returned) Pointer to the first element of an array of int*</span></div>
<div class="line"><a id="l00973" name="l00973"></a><span class="lineno"> 973</span><span class="comment">* containing pointers to the first elements of the arrays of integer</span></div>
<div class="line"><a id="l00974" name="l00974"></a><span class="lineno"> 974</span><span class="comment">* distortion parameters for each axis.</span></div>
<div class="line"><a id="l00975" name="l00975"></a><span class="lineno"> 975</span><span class="comment">*</span></div>
<div class="line"><a id="l00976" name="l00976"></a><span class="lineno"> 976</span><span class="comment">* double **dparm</span></div>
<div class="line"><a id="l00977" name="l00977"></a><span class="lineno"> 977</span><span class="comment">* (Returned) Pointer to the first element of an array of double*</span></div>
<div class="line"><a id="l00978" name="l00978"></a><span class="lineno"> 978</span><span class="comment">* containing pointers to the first elements of the arrays of floating</span></div>
<div class="line"><a id="l00979" name="l00979"></a><span class="lineno"> 979</span><span class="comment">* point distortion parameters for each axis.</span></div>
<div class="line"><a id="l00980" name="l00980"></a><span class="lineno"> 980</span><span class="comment">*</span></div>
<div class="line"><a id="l00981" name="l00981"></a><span class="lineno"> 981</span><span class="comment">* int i_naxis</span></div>
<div class="line"><a id="l00982" name="l00982"></a><span class="lineno"> 982</span><span class="comment">* (Returned) Dimension of the internal arrays (normally equal to naxis).</span></div>
<div class="line"><a id="l00983" name="l00983"></a><span class="lineno"> 983</span><span class="comment">*</span></div>
<div class="line"><a id="l00984" name="l00984"></a><span class="lineno"> 984</span><span class="comment">* int ndis</span></div>
<div class="line"><a id="l00985" name="l00985"></a><span class="lineno"> 985</span><span class="comment">* (Returned) The number of distortion functions.</span></div>
<div class="line"><a id="l00986" name="l00986"></a><span class="lineno"> 986</span><span class="comment">*</span></div>
<div class="line"><a id="l00987" name="l00987"></a><span class="lineno"> 987</span><span class="comment">* struct wcserr *err</span></div>
<div class="line"><a id="l00988" name="l00988"></a><span class="lineno"> 988</span><span class="comment">* (Returned) If enabled, when an error status is returned, this struct</span></div>
<div class="line"><a id="l00989" name="l00989"></a><span class="lineno"> 989</span><span class="comment">* contains detailed information about the error, see wcserr_enable().</span></div>
<div class="line"><a id="l00990" name="l00990"></a><span class="lineno"> 990</span><span class="comment">*</span></div>
<div class="line"><a id="l00991" name="l00991"></a><span class="lineno"> 991</span><span class="comment">* int (**disp2x)(DISP2X_ARGS)</span></div>
<div class="line"><a id="l00992" name="l00992"></a><span class="lineno"> 992</span><span class="comment">* (For internal use only.)</span></div>
<div class="line"><a id="l00993" name="l00993"></a><span class="lineno"> 993</span><span class="comment">* int (**disx2p)(DISX2P_ARGS)</span></div>
<div class="line"><a id="l00994" name="l00994"></a><span class="lineno"> 994</span><span class="comment">* (For internal use only.)</span></div>
<div class="line"><a id="l00995" name="l00995"></a><span class="lineno"> 995</span><span class="comment">* double *dummy</span></div>
<div class="line"><a id="l00996" name="l00996"></a><span class="lineno"> 996</span><span class="comment">* (For internal use only.)</span></div>
<div class="line"><a id="l00997" name="l00997"></a><span class="lineno"> 997</span><span class="comment">* int m_flag</span></div>
<div class="line"><a id="l00998" name="l00998"></a><span class="lineno"> 998</span><span class="comment">* (For internal use only.)</span></div>
<div class="line"><a id="l00999" name="l00999"></a><span class="lineno"> 999</span><span class="comment">* int m_naxis</span></div>
<div class="line"><a id="l01000" name="l01000"></a><span class="lineno"> 1000</span><span class="comment">* (For internal use only.)</span></div>
<div class="line"><a id="l01001" name="l01001"></a><span class="lineno"> 1001</span><span class="comment">* char (*m_dtype)[72]</span></div>
<div class="line"><a id="l01002" name="l01002"></a><span class="lineno"> 1002</span><span class="comment">* (For internal use only.)</span></div>
<div class="line"><a id="l01003" name="l01003"></a><span class="lineno"> 1003</span><span class="comment">* double **m_dp</span></div>
<div class="line"><a id="l01004" name="l01004"></a><span class="lineno"> 1004</span><span class="comment">* (For internal use only.)</span></div>
<div class="line"><a id="l01005" name="l01005"></a><span class="lineno"> 1005</span><span class="comment">* double *m_maxdis</span></div>
<div class="line"><a id="l01006" name="l01006"></a><span class="lineno"> 1006</span><span class="comment">* (For internal use only.)</span></div>
<div class="line"><a id="l01007" name="l01007"></a><span class="lineno"> 1007</span><span class="comment">*</span></div>
<div class="line"><a id="l01008" name="l01008"></a><span class="lineno"> 1008</span><span class="comment">*</span></div>
<div class="line"><a id="l01009" name="l01009"></a><span class="lineno"> 1009</span><span class="comment">* dpkey struct - Store for DPja and DQia keyvalues</span></div>
<div class="line"><a id="l01010" name="l01010"></a><span class="lineno"> 1010</span><span class="comment">* ------------------------------------------------</span></div>
<div class="line"><a id="l01011" name="l01011"></a><span class="lineno"> 1011</span><span class="comment">* The dpkey struct is used to pass the parsed contents of DPja or DQia</span></div>
<div class="line"><a id="l01012" name="l01012"></a><span class="lineno"> 1012</span><span class="comment">* keyrecords to disset() via the disprm struct. A disprm struct must hold</span></div>
<div class="line"><a id="l01013" name="l01013"></a><span class="lineno"> 1013</span><span class="comment">* only DPja or DQia keyvalues, not both.</span></div>
<div class="line"><a id="l01014" name="l01014"></a><span class="lineno"> 1014</span><span class="comment">*</span></div>
<div class="line"><a id="l01015" name="l01015"></a><span class="lineno"> 1015</span><span class="comment">* All members of this struct are to be set by the user.</span></div>
<div class="line"><a id="l01016" name="l01016"></a><span class="lineno"> 1016</span><span class="comment">*</span></div>
<div class="line"><a id="l01017" name="l01017"></a><span class="lineno"> 1017</span><span class="comment">* char field[72]</span></div>
<div class="line"><a id="l01018" name="l01018"></a><span class="lineno"> 1018</span><span class="comment">* (Given) The full field name of the record, including the keyword name.</span></div>
<div class="line"><a id="l01019" name="l01019"></a><span class="lineno"> 1019</span><span class="comment">* Note that the colon delimiter separating the field name and the value in</span></div>
<div class="line"><a id="l01020" name="l01020"></a><span class="lineno"> 1020</span><span class="comment">* record-valued keyvalues is not part of the field name. For example, in</span></div>
<div class="line"><a id="l01021" name="l01021"></a><span class="lineno"> 1021</span><span class="comment">* the following:</span></div>
<div class="line"><a id="l01022" name="l01022"></a><span class="lineno"> 1022</span><span class="comment">*</span></div>
<div class="line"><a id="l01023" name="l01023"></a><span class="lineno"> 1023</span><span class="comment">= DP3A = 'AXIS.1: 2'</span></div>
<div class="line"><a id="l01024" name="l01024"></a><span class="lineno"> 1024</span><span class="comment">*</span></div>
<div class="line"><a id="l01025" name="l01025"></a><span class="lineno"> 1025</span><span class="comment">* the full record field name is "DP3A.AXIS.1", and the record's value</span></div>
<div class="line"><a id="l01026" name="l01026"></a><span class="lineno"> 1026</span><span class="comment">* is 2.</span></div>
<div class="line"><a id="l01027" name="l01027"></a><span class="lineno"> 1027</span><span class="comment">*</span></div>
<div class="line"><a id="l01028" name="l01028"></a><span class="lineno"> 1028</span><span class="comment">* int j</span></div>
<div class="line"><a id="l01029" name="l01029"></a><span class="lineno"> 1029</span><span class="comment">* (Given) Axis number (1-relative), i.e. the j in DPja or i in DQia.</span></div>
<div class="line"><a id="l01030" name="l01030"></a><span class="lineno"> 1030</span><span class="comment">*</span></div>
<div class="line"><a id="l01031" name="l01031"></a><span class="lineno"> 1031</span><span class="comment">* int type</span></div>
<div class="line"><a id="l01032" name="l01032"></a><span class="lineno"> 1032</span><span class="comment">* (Given) The data type of the record's value</span></div>
<div class="line"><a id="l01033" name="l01033"></a><span class="lineno"> 1033</span><span class="comment">* - 0: Integer (stored as an int),</span></div>
<div class="line"><a id="l01034" name="l01034"></a><span class="lineno"> 1034</span><span class="comment">* - 1: Floating point (stored as a double).</span></div>
<div class="line"><a id="l01035" name="l01035"></a><span class="lineno"> 1035</span><span class="comment">*</span></div>
<div class="line"><a id="l01036" name="l01036"></a><span class="lineno"> 1036</span><span class="comment">* union value</span></div>
<div class="line"><a id="l01037" name="l01037"></a><span class="lineno"> 1037</span><span class="comment">* (Given) A union comprised of</span></div>
<div class="line"><a id="l01038" name="l01038"></a><span class="lineno"> 1038</span><span class="comment">* - dpkey::i,</span></div>
<div class="line"><a id="l01039" name="l01039"></a><span class="lineno"> 1039</span><span class="comment">* - dpkey::f,</span></div>
<div class="line"><a id="l01040" name="l01040"></a><span class="lineno"> 1040</span><span class="comment">*</span></div>
<div class="line"><a id="l01041" name="l01041"></a><span class="lineno"> 1041</span><span class="comment">* the record's value.</span></div>
<div class="line"><a id="l01042" name="l01042"></a><span class="lineno"> 1042</span><span class="comment">*</span></div>
<div class="line"><a id="l01043" name="l01043"></a><span class="lineno"> 1043</span><span class="comment">*</span></div>
<div class="line"><a id="l01044" name="l01044"></a><span class="lineno"> 1044</span><span class="comment">* Global variable: const char *dis_errmsg[] - Status return messages</span></div>
<div class="line"><a id="l01045" name="l01045"></a><span class="lineno"> 1045</span><span class="comment">* ------------------------------------------------------------------</span></div>
<div class="line"><a id="l01046" name="l01046"></a><span class="lineno"> 1046</span><span class="comment">* Error messages to match the status value returned from each function.</span></div>
<div class="line"><a id="l01047" name="l01047"></a><span class="lineno"> 1047</span><span class="comment">*</span></div>
<div class="line"><a id="l01048" name="l01048"></a><span class="lineno"> 1048</span><span class="comment">*===========================================================================*/</span></div>
<div class="line"><a id="l01049" name="l01049"></a><span class="lineno"> 1049</span> </div>
<div class="line"><a id="l01050" name="l01050"></a><span class="lineno"> 1050</span><span class="preprocessor">#ifndef WCSLIB_DIS</span></div>
<div class="line"><a id="l01051" name="l01051"></a><span class="lineno"> 1051</span><span class="preprocessor">#define WCSLIB_DIS</span></div>
<div class="line"><a id="l01052" name="l01052"></a><span class="lineno"> 1052</span> </div>
<div class="line"><a id="l01053" name="l01053"></a><span class="lineno"> 1053</span><span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a id="l01054" name="l01054"></a><span class="lineno"> 1054</span><span class="keyword">extern</span> <span class="stringliteral">"C"</span> {</div>
<div class="line"><a id="l01055" name="l01055"></a><span class="lineno"> 1055</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l01056" name="l01056"></a><span class="lineno"> 1056</span> </div>
<div class="line"><a id="l01057" name="l01057"></a><span class="lineno"> 1057</span> </div>
<div class="line"><a id="l01058" name="l01058"></a><span class="lineno"> 1058</span><span class="keyword">extern</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a class="code hl_variable" href="dis_8h.html#a6f125a402553f5dab46435299f0742a3">dis_errmsg</a>[];</div>
<div class="line"><a id="l01059" name="l01059"></a><span class="lineno"> 1059</span> </div>
<div class="foldopen" id="foldopen01060" data-start="{" data-end="};">
<div class="line"><a id="l01060" name="l01060"></a><span class="lineno"><a class="line" href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fd"> 1060</a></span><span class="keyword">enum</span> <a class="code hl_enumeration" href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fd">dis_errmsg_enum</a> {</div>
<div class="line"><a id="l01061" name="l01061"></a><span class="lineno"><a class="line" href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fdaeaef8bb1725ea601f43900897ee144a8"> 1061</a></span> <a class="code hl_enumvalue" href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fdaeaef8bb1725ea601f43900897ee144a8">DISERR_SUCCESS</a> = 0, <span class="comment">// Success.</span></div>
<div class="line"><a id="l01062" name="l01062"></a><span class="lineno"><a class="line" href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fda8c5a7d847d62520f972e51435d4d0d46"> 1062</a></span> <a class="code hl_enumvalue" href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fda8c5a7d847d62520f972e51435d4d0d46">DISERR_NULL_POINTER</a> = 1, <span class="comment">// Null disprm pointer passed.</span></div>
<div class="line"><a id="l01063" name="l01063"></a><span class="lineno"><a class="line" href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fda7298d8c404456ac8c3a5365f2f266d80"> 1063</a></span> <a class="code hl_enumvalue" href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fda7298d8c404456ac8c3a5365f2f266d80">DISERR_MEMORY</a> = 2, <span class="comment">// Memory allocation failed.</span></div>
<div class="line"><a id="l01064" name="l01064"></a><span class="lineno"><a class="line" href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fdace3a5f769a3b8966f980f1279e2f08b0"> 1064</a></span> <a class="code hl_enumvalue" href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fdace3a5f769a3b8966f980f1279e2f08b0">DISERR_BAD_PARAM</a> = 3, <span class="comment">// Invalid parameter value.</span></div>
<div class="line"><a id="l01065" name="l01065"></a><span class="lineno"><a class="line" href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fdadbabbc4a9fe6441177efcd050b4cc579"> 1065</a></span> <a class="code hl_enumvalue" href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fdadbabbc4a9fe6441177efcd050b4cc579">DISERR_DISTORT</a> = 4, <span class="comment">// Distortion error.</span></div>
<div class="line"><a id="l01066" name="l01066"></a><span class="lineno"> 1066</span> <a class="code hl_enumvalue" href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fdabe0645cb8d4bfc0f496aa84336ca492a">DISERR_DEDISTORT</a> = 5 <span class="comment">// De-distortion error.</span></div>
<div class="line"><a id="l01067" name="l01067"></a><span class="lineno"><a class="line" href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fdabe0645cb8d4bfc0f496aa84336ca492a"> 1067</a></span>};</div>
</div>
<div class="line"><a id="l01068" name="l01068"></a><span class="lineno"> 1068</span> </div>
<div class="line"><a id="l01069" name="l01069"></a><span class="lineno"> 1069</span><span class="comment">// For use in declaring distortion function prototypes (= DISX2P_ARGS).</span></div>
<div class="foldopen" id="foldopen01070" data-start="" data-end="">
<div class="line"><a id="l01070" name="l01070"></a><span class="lineno"><a class="line" href="dis_8h.html#a23068602f42552a4257462b2875d8c51"> 1070</a></span><span class="preprocessor">#define DISP2X_ARGS int inverse, const int iparm[], const double dparm[], \</span></div>
<div class="line"><a id="l01071" name="l01071"></a><span class="lineno"> 1071</span><span class="preprocessor">int ncrd, const double rawcrd[], double *discrd</span></div>
</div>
<div class="line"><a id="l01072" name="l01072"></a><span class="lineno"> 1072</span> </div>
<div class="line"><a id="l01073" name="l01073"></a><span class="lineno"> 1073</span><span class="comment">// For use in declaring de-distortion function prototypes (= DISP2X_ARGS).</span></div>
<div class="foldopen" id="foldopen01074" data-start="" data-end="">
<div class="line"><a id="l01074" name="l01074"></a><span class="lineno"><a class="line" href="dis_8h.html#ac593cd79fb7f89b1c7395d0ecf2f7876"> 1074</a></span><span class="preprocessor">#define DISX2P_ARGS int inverse, const int iparm[], const double dparm[], \</span></div>
<div class="line"><a id="l01075" name="l01075"></a><span class="lineno"> 1075</span><span class="preprocessor">int ncrd, const double discrd[], double *rawcrd</span></div>
</div>
<div class="line"><a id="l01076" name="l01076"></a><span class="lineno"> 1076</span> </div>
<div class="line"><a id="l01077" name="l01077"></a><span class="lineno"> 1077</span> </div>
<div class="line"><a id="l01078" name="l01078"></a><span class="lineno"> 1078</span><span class="comment">// Struct used for storing DPja and DQia keyvalues.</span></div>
<div class="foldopen" id="foldopen01079" data-start="{" data-end="};">
<div class="line"><a id="l01079" name="l01079"></a><span class="lineno"><a class="line" href="structdpkey.html"> 1079</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structdpkey.html">dpkey</a> {</div>
<div class="line"><a id="l01080" name="l01080"></a><span class="lineno"><a class="line" href="structdpkey.html#a7585bc8185c349dc4e13b7964606933e"> 1080</a></span> <span class="keywordtype">char</span> <a class="code hl_variable" href="structdpkey.html#a7585bc8185c349dc4e13b7964606933e">field</a>[72]; <span class="comment">// Full record field name (no colon).</span></div>
<div class="line"><a id="l01081" name="l01081"></a><span class="lineno"><a class="line" href="structdpkey.html#aeab33684c9284d0d73757224b32a6d73"> 1081</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structdpkey.html#aeab33684c9284d0d73757224b32a6d73">j</a>; <span class="comment">// Axis number, as in DPja (1-relative).</span></div>
<div class="line"><a id="l01082" name="l01082"></a><span class="lineno"><a class="line" href="structdpkey.html#adce16b786bbb5d4663e9cb201b124a0e"> 1082</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structdpkey.html#adce16b786bbb5d4663e9cb201b124a0e">type</a>; <span class="comment">// Data type of value.</span></div>
<div class="line"><a id="l01083" name="l01083"></a><span class="lineno"> 1083</span> <span class="keyword">union </span>{</div>
<div class="line"><a id="l01084" name="l01084"></a><span class="lineno"><a class="line" href="structdpkey.html#a1fa8264c0a1237e9e4303058d3633569"> 1084</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structdpkey.html#a1fa8264c0a1237e9e4303058d3633569">i</a>; <span class="comment">// Integer record value.</span></div>
<div class="line"><a id="l01085" name="l01085"></a><span class="lineno"><a class="line" href="structdpkey.html#af662dfc2d66f2803d73583780079281a"> 1085</a></span> <span class="keywordtype">double</span> <a class="code hl_variable" href="structdpkey.html#af662dfc2d66f2803d73583780079281a">f</a>; <span class="comment">// Floating point record value.</span></div>
<div class="line"><a id="l01086" name="l01086"></a><span class="lineno"><a class="line" href="structdpkey.html#a18c6c3caf495a1f57ef0cb1e800e974f"> 1086</a></span> } <a class="code hl_variable" href="structdpkey.html#a18c6c3caf495a1f57ef0cb1e800e974f">value</a>; <span class="comment">// Record value.</span></div>
<div class="line"><a id="l01087" name="l01087"></a><span class="lineno"> 1087</span>};</div>
</div>
<div class="line"><a id="l01088" name="l01088"></a><span class="lineno"> 1088</span> </div>
<div class="line"><a id="l01089" name="l01089"></a><span class="lineno"> 1089</span><span class="comment">// Size of the dpkey struct in int units, used by the Fortran wrappers.</span></div>
<div class="line"><a id="l01090" name="l01090"></a><span class="lineno"><a class="line" href="dis_8h.html#a10a6a35bdc567bcbedf1ec10c4aa94c3"> 1090</a></span><span class="preprocessor">#define DPLEN (sizeof(struct dpkey)/sizeof(int))</span></div>
<div class="line"><a id="l01091" name="l01091"></a><span class="lineno"> 1091</span> </div>
<div class="line"><a id="l01092" name="l01092"></a><span class="lineno"> 1092</span> </div>
<div class="foldopen" id="foldopen01093" data-start="{" data-end="};">
<div class="line"><a id="l01093" name="l01093"></a><span class="lineno"><a class="line" href="structdisprm.html"> 1093</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structdisprm.html">disprm</a> {</div>
<div class="line"><a id="l01094" name="l01094"></a><span class="lineno"> 1094</span> <span class="comment">// Initialization flag (see the prologue above).</span></div>
<div class="line"><a id="l01095" name="l01095"></a><span class="lineno"> 1095</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l01096" name="l01096"></a><span class="lineno"><a class="line" href="structdisprm.html#a4d6ba28bee2fc636f4b2b9ca4b50b0a4"> 1096</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structdisprm.html#a4d6ba28bee2fc636f4b2b9ca4b50b0a4">flag</a>; <span class="comment">// Set to zero to force initialization.</span></div>
<div class="line"><a id="l01097" name="l01097"></a><span class="lineno"> 1097</span> </div>
<div class="line"><a id="l01098" name="l01098"></a><span class="lineno"> 1098</span> <span class="comment">// Parameters to be provided (see the prologue above).</span></div>
<div class="line"><a id="l01099" name="l01099"></a><span class="lineno"> 1099</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l01100" name="l01100"></a><span class="lineno"><a class="line" href="structdisprm.html#a201bc2948f326bbed9a0e1f818720ef9"> 1100</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structdisprm.html#a201bc2948f326bbed9a0e1f818720ef9">naxis</a>; <span class="comment">// The number of pixel coordinate elements,</span></div>
<div class="line"><a id="l01101" name="l01101"></a><span class="lineno"> 1101</span> <span class="comment">// given by NAXIS.</span></div>
<div class="line"><a id="l01102" name="l01102"></a><span class="lineno"><a class="line" href="structdisprm.html#a434f7952a43eba6485c03335179a25a7"> 1102</a></span> char (*<a class="code hl_variable" href="structdisprm.html#a434f7952a43eba6485c03335179a25a7">dtype</a>)[72]; <span class="comment">// For each axis, the distortion type.</span></div>
<div class="line"><a id="l01103" name="l01103"></a><span class="lineno"><a class="line" href="structdisprm.html#acac42172b4486502e27e1b6e198c557f"> 1103</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structdisprm.html#acac42172b4486502e27e1b6e198c557f">ndp</a>; <span class="comment">// Number of DPja or DQia keywords, and the</span></div>
<div class="line"><a id="l01104" name="l01104"></a><span class="lineno"><a class="line" href="structdisprm.html#a6307557409cf4679a176f16b7dc14b7f"> 1104</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structdisprm.html#a6307557409cf4679a176f16b7dc14b7f">ndpmax</a>; <span class="comment">// number for which space was allocated.</span></div>
<div class="line"><a id="l01105" name="l01105"></a><span class="lineno"><a class="line" href="structdisprm.html#a71567452603ef3effc07877e7366a5b2"> 1105</a></span> <span class="keyword">struct </span><a class="code hl_struct" href="structdpkey.html">dpkey</a> *<a class="code hl_variable" href="structdisprm.html#a71567452603ef3effc07877e7366a5b2">dp</a>; <span class="comment">// DPja or DQia keyvalues (not both).</span></div>
<div class="line"><a id="l01106" name="l01106"></a><span class="lineno"><a class="line" href="structdisprm.html#a10a16217368a5cdd34d802fff442f383"> 1106</a></span> <span class="keywordtype">double</span> <a class="code hl_variable" href="structdisprm.html#a10a16217368a5cdd34d802fff442f383">totdis</a>; <span class="comment">// The maximum combined distortion.</span></div>
<div class="line"><a id="l01107" name="l01107"></a><span class="lineno"><a class="line" href="structdisprm.html#ac107b9b4c645a461036476290a87ab22"> 1107</a></span> <span class="keywordtype">double</span> *<a class="code hl_variable" href="structdisprm.html#ac107b9b4c645a461036476290a87ab22">maxdis</a>; <span class="comment">// For each axis, the maximum distortion.</span></div>
<div class="line"><a id="l01108" name="l01108"></a><span class="lineno"> 1108</span> </div>
<div class="line"><a id="l01109" name="l01109"></a><span class="lineno"> 1109</span> <span class="comment">// Information derived from the parameters supplied.</span></div>
<div class="line"><a id="l01110" name="l01110"></a><span class="lineno"> 1110</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l01111" name="l01111"></a><span class="lineno"><a class="line" href="structdisprm.html#a896bb8ce24e1b3cab7179eeaa0cfa2d4"> 1111</a></span> <span class="keywordtype">int</span> *<a class="code hl_variable" href="structdisprm.html#a896bb8ce24e1b3cab7179eeaa0cfa2d4">docorr</a>; <span class="comment">// For each axis, the mode of correction.</span></div>
<div class="line"><a id="l01112" name="l01112"></a><span class="lineno"><a class="line" href="structdisprm.html#af0fa6585e8b763cc0dcbe3775ca504a7"> 1112</a></span> <span class="keywordtype">int</span> *<a class="code hl_variable" href="structdisprm.html#af0fa6585e8b763cc0dcbe3775ca504a7">Nhat</a>; <span class="comment">// For each axis, the number of coordinate</span></div>
<div class="line"><a id="l01113" name="l01113"></a><span class="lineno"> 1113</span> <span class="comment">// axes that form the independent variables</span></div>
<div class="line"><a id="l01114" name="l01114"></a><span class="lineno"> 1114</span> <span class="comment">// of the distortion function.</span></div>
<div class="line"><a id="l01115" name="l01115"></a><span class="lineno"><a class="line" href="structdisprm.html#ab62d14319c82c93c70d290728cab78c4"> 1115</a></span> <span class="keywordtype">int</span> **<a class="code hl_variable" href="structdisprm.html#ab62d14319c82c93c70d290728cab78c4">axmap</a>; <span class="comment">// For each axis, the axis mapping array.</span></div>
<div class="line"><a id="l01116" name="l01116"></a><span class="lineno"><a class="line" href="structdisprm.html#a8b0ac30436d7bb3e12e0ca1c64fda337"> 1116</a></span> <span class="keywordtype">double</span> **<a class="code hl_variable" href="structdisprm.html#a8b0ac30436d7bb3e12e0ca1c64fda337">offset</a>; <span class="comment">// For each axis, renormalization offsets.</span></div>
<div class="line"><a id="l01117" name="l01117"></a><span class="lineno"><a class="line" href="structdisprm.html#a1f7b541d7130698acc6781b7ca83dab8"> 1117</a></span> <span class="keywordtype">double</span> **<a class="code hl_variable" href="structdisprm.html#a1f7b541d7130698acc6781b7ca83dab8">scale</a>; <span class="comment">// For each axis, renormalization scales.</span></div>
<div class="line"><a id="l01118" name="l01118"></a><span class="lineno"><a class="line" href="structdisprm.html#a1c5120a5905e79191adf6d98bdc63e50"> 1118</a></span> <span class="keywordtype">int</span> **<a class="code hl_variable" href="structdisprm.html#a1c5120a5905e79191adf6d98bdc63e50">iparm</a>; <span class="comment">// For each axis, the array of integer</span></div>
<div class="line"><a id="l01119" name="l01119"></a><span class="lineno"> 1119</span> <span class="comment">// distortion parameters.</span></div>
<div class="line"><a id="l01120" name="l01120"></a><span class="lineno"><a class="line" href="structdisprm.html#a9775ace81c64bf04c0fbe5b750bc2a79"> 1120</a></span> <span class="keywordtype">double</span> **<a class="code hl_variable" href="structdisprm.html#a9775ace81c64bf04c0fbe5b750bc2a79">dparm</a>; <span class="comment">// For each axis, the array of floating</span></div>
<div class="line"><a id="l01121" name="l01121"></a><span class="lineno"> 1121</span> <span class="comment">// point distortion parameters.</span></div>
<div class="line"><a id="l01122" name="l01122"></a><span class="lineno"><a class="line" href="structdisprm.html#a51ff2cd3afbfdaed9da115f2f46f3ff9"> 1122</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structdisprm.html#a51ff2cd3afbfdaed9da115f2f46f3ff9">i_naxis</a>; <span class="comment">// Dimension of the internal arrays.</span></div>
<div class="line"><a id="l01123" name="l01123"></a><span class="lineno"><a class="line" href="structdisprm.html#a7fae0b75ba71ee0eaafaa1d3a20cc6af"> 1123</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structdisprm.html#a7fae0b75ba71ee0eaafaa1d3a20cc6af">ndis</a>; <span class="comment">// The number of distortion functions.</span></div>
<div class="line"><a id="l01124" name="l01124"></a><span class="lineno"> 1124</span> </div>
<div class="line"><a id="l01125" name="l01125"></a><span class="lineno"> 1125</span> <span class="comment">// Error handling, if enabled.</span></div>
<div class="line"><a id="l01126" name="l01126"></a><span class="lineno"> 1126</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l01127" name="l01127"></a><span class="lineno"><a class="line" href="structdisprm.html#a40a81085335f9d9aa617eb9605ae9421"> 1127</a></span> <span class="keyword">struct </span><a class="code hl_struct" href="structwcserr.html">wcserr</a> *<a class="code hl_variable" href="structdisprm.html#a40a81085335f9d9aa617eb9605ae9421">err</a>;</div>
<div class="line"><a id="l01128" name="l01128"></a><span class="lineno"> 1128</span> </div>
<div class="line"><a id="l01129" name="l01129"></a><span class="lineno"> 1129</span> <span class="comment">// Private - the remainder are for internal use.</span></div>
<div class="line"><a id="l01130" name="l01130"></a><span class="lineno"> 1130</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l01131" name="l01131"></a><span class="lineno"><a class="line" href="structdisprm.html#a52c639193240123e66b75e68a9a26add"> 1131</a></span> int (**<a class="code hl_variable" href="structdisprm.html#a52c639193240123e66b75e68a9a26add">disp2x</a>)(<a class="code hl_define" href="dis_8h.html#a23068602f42552a4257462b2875d8c51">DISP2X_ARGS</a>); <span class="comment">// For each axis, pointers to the</span></div>
<div class="line"><a id="l01132" name="l01132"></a><span class="lineno"><a class="line" href="structdisprm.html#ae438b6d2aaea0e6b97c3a3377d6904f3"> 1132</a></span> int (**<a class="code hl_variable" href="structdisprm.html#ae438b6d2aaea0e6b97c3a3377d6904f3">disx2p</a>)(<a class="code hl_define" href="dis_8h.html#ac593cd79fb7f89b1c7395d0ecf2f7876">DISX2P_ARGS</a>); <span class="comment">// distortion function and its inverse.</span></div>
<div class="line"><a id="l01133" name="l01133"></a><span class="lineno"> 1133</span> </div>
<div class="line"><a id="l01134" name="l01134"></a><span class="lineno"><a class="line" href="structdisprm.html#afb5079136a7ec5ae4effef9790e31439"> 1134</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structdisprm.html#afb5079136a7ec5ae4effef9790e31439">m_flag</a>, <a class="code hl_variable" href="structdisprm.html#a6a8b2e3fc58d8f21668a82a93b199712">m_naxis</a>; <span class="comment">// The remainder are for memory management.</span></div>
<div class="line"><a id="l01135" name="l01135"></a><span class="lineno"><a class="line" href="structdisprm.html#a9649d0399d35dbad2c90127f8c7eeb75"> 1135</a></span> char (*<a class="code hl_variable" href="structdisprm.html#a9649d0399d35dbad2c90127f8c7eeb75">m_dtype</a>)[72];</div>
<div class="line"><a id="l01136" name="l01136"></a><span class="lineno"><a class="line" href="structdisprm.html#abea82d3433ef561c144dfe1f481e51b3"> 1136</a></span> <span class="keyword">struct </span><a class="code hl_struct" href="structdpkey.html">dpkey</a> *<a class="code hl_variable" href="structdisprm.html#abea82d3433ef561c144dfe1f481e51b3">m_dp</a>;</div>
<div class="line"><a id="l01137" name="l01137"></a><span class="lineno"><a class="line" href="structdisprm.html#a4f692b3bb436ceab5861ec9566d127e4"> 1137</a></span> <span class="keywordtype">double</span> *<a class="code hl_variable" href="structdisprm.html#a4f692b3bb436ceab5861ec9566d127e4">m_maxdis</a>;</div>
<div class="line"><a id="l01138" name="l01138"></a><span class="lineno"> 1138</span>};</div>
</div>
<div class="line"><a id="l01139" name="l01139"></a><span class="lineno"> 1139</span> </div>
<div class="line"><a id="l01140" name="l01140"></a><span class="lineno"> 1140</span><span class="comment">// Size of the disprm struct in int units, used by the Fortran wrappers.</span></div>
<div class="line"><a id="l01141" name="l01141"></a><span class="lineno"><a class="line" href="dis_8h.html#a5df41117cb392fc0c5d051002b441aa9"> 1141</a></span><span class="preprocessor">#define DISLEN (sizeof(struct disprm)/sizeof(int))</span></div>
<div class="line"><a id="l01142" name="l01142"></a><span class="lineno"> 1142</span> </div>
<div class="line"><a id="l01143" name="l01143"></a><span class="lineno"> 1143</span> </div>
<div class="line"><a id="l01144" name="l01144"></a><span class="lineno"><a class="line" href="dis_8h.html#aa5486b870327544f7423ad2751fb4120"> 1144</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="dis_8h.html#aa5486b870327544f7423ad2751fb4120">disndp</a>(<span class="keywordtype">int</span> n);</div>
<div class="line"><a id="l01145" name="l01145"></a><span class="lineno"> 1145</span> </div>
<div class="line"><a id="l01146" name="l01146"></a><span class="lineno"><a class="line" href="dis_8h.html#a44e73dd6831a2eb25f09d316d175875f"> 1146</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="dis_8h.html#a44e73dd6831a2eb25f09d316d175875f">dpfill</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structdpkey.html">dpkey</a> *dp, <span class="keyword">const</span> <span class="keywordtype">char</span> *keyword, <span class="keyword">const</span> <span class="keywordtype">char</span> *<a class="code hl_variable" href="structdpkey.html#a7585bc8185c349dc4e13b7964606933e">field</a>, <span class="keywordtype">int</span> <a class="code hl_variable" href="structdpkey.html#aeab33684c9284d0d73757224b32a6d73">j</a>,</div>
<div class="line"><a id="l01147" name="l01147"></a><span class="lineno"> 1147</span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structdpkey.html#adce16b786bbb5d4663e9cb201b124a0e">type</a>, <span class="keywordtype">int</span> <a class="code hl_variable" href="structdpkey.html#a1fa8264c0a1237e9e4303058d3633569">i</a>, <span class="keywordtype">double</span> <a class="code hl_variable" href="structdpkey.html#af662dfc2d66f2803d73583780079281a">f</a>);</div>
<div class="line"><a id="l01148" name="l01148"></a><span class="lineno"> 1148</span> </div>
<div class="line"><a id="l01149" name="l01149"></a><span class="lineno"><a class="line" href="dis_8h.html#a5fab5cff95ef5e505314a6fb67325074"> 1149</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="dis_8h.html#a5fab5cff95ef5e505314a6fb67325074">dpkeyi</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code hl_struct" href="structdpkey.html">dpkey</a> *dp);</div>
<div class="line"><a id="l01150" name="l01150"></a><span class="lineno"> 1150</span> </div>
<div class="line"><a id="l01151" name="l01151"></a><span class="lineno"><a class="line" href="dis_8h.html#a2181881844241449382477a5c2723082"> 1151</a></span><span class="keywordtype">double</span> <a class="code hl_function" href="dis_8h.html#a2181881844241449382477a5c2723082">dpkeyd</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code hl_struct" href="structdpkey.html">dpkey</a> *dp);</div>
<div class="line"><a id="l01152" name="l01152"></a><span class="lineno"> 1152</span> </div>
<div class="line"><a id="l01153" name="l01153"></a><span class="lineno"><a class="line" href="dis_8h.html#a8896e2a5330e55cd85da4a28ed6ee463"> 1153</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="dis_8h.html#a8896e2a5330e55cd85da4a28ed6ee463">disini</a>(<span class="keywordtype">int</span> alloc, <span class="keywordtype">int</span> naxis, <span class="keyword">struct</span> <a class="code hl_struct" href="structdisprm.html">disprm</a> *dis);</div>
<div class="line"><a id="l01154" name="l01154"></a><span class="lineno"> 1154</span> </div>
<div class="line"><a id="l01155" name="l01155"></a><span class="lineno"><a class="line" href="dis_8h.html#a3e0e67bdd01c86eede779de63249c703"> 1155</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="dis_8h.html#a3e0e67bdd01c86eede779de63249c703">disinit</a>(<span class="keywordtype">int</span> alloc, <span class="keywordtype">int</span> naxis, <span class="keyword">struct</span> <a class="code hl_struct" href="structdisprm.html">disprm</a> *dis, <span class="keywordtype">int</span> ndpmax);</div>
<div class="line"><a id="l01156" name="l01156"></a><span class="lineno"> 1156</span> </div>
<div class="line"><a id="l01157" name="l01157"></a><span class="lineno"><a class="line" href="dis_8h.html#a42e03676a3def43ef6b936cd7beb4dd5"> 1157</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="dis_8h.html#a42e03676a3def43ef6b936cd7beb4dd5">discpy</a>(<span class="keywordtype">int</span> alloc, <span class="keyword">const</span> <span class="keyword">struct</span> <a class="code hl_struct" href="structdisprm.html">disprm</a> *dissrc, <span class="keyword">struct</span> <a class="code hl_struct" href="structdisprm.html">disprm</a> *disdst);</div>
<div class="line"><a id="l01158" name="l01158"></a><span class="lineno"> 1158</span> </div>
<div class="line"><a id="l01159" name="l01159"></a><span class="lineno"><a class="line" href="dis_8h.html#a83b98d0f6429f4f19024675645026187"> 1159</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="dis_8h.html#a83b98d0f6429f4f19024675645026187">disfree</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structdisprm.html">disprm</a> *dis);</div>
<div class="line"><a id="l01160" name="l01160"></a><span class="lineno"> 1160</span> </div>
<div class="line"><a id="l01161" name="l01161"></a><span class="lineno"><a class="line" href="dis_8h.html#a6f07892abc6d9d73ee9017750dc7bd8d"> 1161</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="dis_8h.html#a6f07892abc6d9d73ee9017750dc7bd8d">dissize</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code hl_struct" href="structdisprm.html">disprm</a> *dis, <span class="keywordtype">int</span> sizes[2]);</div>
<div class="line"><a id="l01162" name="l01162"></a><span class="lineno"> 1162</span> </div>
<div class="line"><a id="l01163" name="l01163"></a><span class="lineno"><a class="line" href="dis_8h.html#aeee35e0d5183e74f20c64526d908886b"> 1163</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="dis_8h.html#aeee35e0d5183e74f20c64526d908886b">disprt</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code hl_struct" href="structdisprm.html">disprm</a> *dis);</div>
<div class="line"><a id="l01164" name="l01164"></a><span class="lineno"> 1164</span> </div>
<div class="line"><a id="l01165" name="l01165"></a><span class="lineno"><a class="line" href="dis_8h.html#acc9e98282026d5a249c450f2d2c0f2f4"> 1165</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="dis_8h.html#acc9e98282026d5a249c450f2d2c0f2f4">disperr</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code hl_struct" href="structdisprm.html">disprm</a> *dis, <span class="keyword">const</span> <span class="keywordtype">char</span> *prefix);</div>
<div class="line"><a id="l01166" name="l01166"></a><span class="lineno"> 1166</span> </div>
<div class="line"><a id="l01167" name="l01167"></a><span class="lineno"><a class="line" href="dis_8h.html#ab69a8e21c3a3b7409458f681bd6ac888"> 1167</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="dis_8h.html#ab69a8e21c3a3b7409458f681bd6ac888">dishdo</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structdisprm.html">disprm</a> *dis);</div>
<div class="line"><a id="l01168" name="l01168"></a><span class="lineno"> 1168</span> </div>
<div class="line"><a id="l01169" name="l01169"></a><span class="lineno"><a class="line" href="dis_8h.html#ad1bdf4497eb4513ca8431e1baa419041"> 1169</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="dis_8h.html#ad1bdf4497eb4513ca8431e1baa419041">disset</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structdisprm.html">disprm</a> *dis);</div>
<div class="line"><a id="l01170" name="l01170"></a><span class="lineno"> 1170</span> </div>
<div class="line"><a id="l01171" name="l01171"></a><span class="lineno"><a class="line" href="dis_8h.html#a135726e4c4c5bc00e2eba865ab202201"> 1171</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="dis_8h.html#a135726e4c4c5bc00e2eba865ab202201">disp2x</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structdisprm.html">disprm</a> *dis, <span class="keyword">const</span> <span class="keywordtype">double</span> rawcrd[], <span class="keywordtype">double</span> discrd[]);</div>
<div class="line"><a id="l01172" name="l01172"></a><span class="lineno"> 1172</span> </div>
<div class="line"><a id="l01173" name="l01173"></a><span class="lineno"><a class="line" href="dis_8h.html#ac589d5e85afe3d775cba4c06734ce653"> 1173</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="dis_8h.html#ac589d5e85afe3d775cba4c06734ce653">disx2p</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structdisprm.html">disprm</a> *dis, <span class="keyword">const</span> <span class="keywordtype">double</span> discrd[], <span class="keywordtype">double</span> rawcrd[]);</div>
<div class="line"><a id="l01174" name="l01174"></a><span class="lineno"> 1174</span> </div>
<div class="line"><a id="l01175" name="l01175"></a><span class="lineno"><a class="line" href="dis_8h.html#a91fa2d34c30be042516a0246d393b116"> 1175</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="dis_8h.html#a91fa2d34c30be042516a0246d393b116">diswarp</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structdisprm.html">disprm</a> *dis, <span class="keyword">const</span> <span class="keywordtype">double</span> pixblc[], <span class="keyword">const</span> <span class="keywordtype">double</span> pixtrc[],</div>
<div class="line"><a id="l01176" name="l01176"></a><span class="lineno"> 1176</span> <span class="keyword">const</span> <span class="keywordtype">double</span> pixsamp[], <span class="keywordtype">int</span> *nsamp,</div>
<div class="line"><a id="l01177" name="l01177"></a><span class="lineno"> 1177</span> <span class="keywordtype">double</span> maxdis[], <span class="keywordtype">double</span> *maxtot,</div>
<div class="line"><a id="l01178" name="l01178"></a><span class="lineno"> 1178</span> <span class="keywordtype">double</span> avgdis[], <span class="keywordtype">double</span> *avgtot,</div>
<div class="line"><a id="l01179" name="l01179"></a><span class="lineno"> 1179</span> <span class="keywordtype">double</span> rmsdis[], <span class="keywordtype">double</span> *rmstot);</div>
<div class="line"><a id="l01180" name="l01180"></a><span class="lineno"> 1180</span> </div>
<div class="line"><a id="l01181" name="l01181"></a><span class="lineno"> 1181</span><span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a id="l01182" name="l01182"></a><span class="lineno"> 1182</span>}</div>
<div class="line"><a id="l01183" name="l01183"></a><span class="lineno"> 1183</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l01184" name="l01184"></a><span class="lineno"> 1184</span> </div>
<div class="line"><a id="l01185" name="l01185"></a><span class="lineno"> 1185</span><span class="preprocessor">#endif </span><span class="comment">// WCSLIB_DIS</span></div>
<div class="ttc" id="adis_8h_html_a135726e4c4c5bc00e2eba865ab202201"><div class="ttname"><a href="dis_8h.html#a135726e4c4c5bc00e2eba865ab202201">disp2x</a></div><div class="ttdeci">int disp2x(struct disprm *dis, const double rawcrd[], double discrd[])</div><div class="ttdoc">Apply distortion function.</div></div>
<div class="ttc" id="adis_8h_html_a2181881844241449382477a5c2723082"><div class="ttname"><a href="dis_8h.html#a2181881844241449382477a5c2723082">dpkeyd</a></div><div class="ttdeci">double dpkeyd(const struct dpkey *dp)</div><div class="ttdoc">Get the data value in a dpkey struct as double.</div></div>
<div class="ttc" id="adis_8h_html_a23068602f42552a4257462b2875d8c51"><div class="ttname"><a href="dis_8h.html#a23068602f42552a4257462b2875d8c51">DISP2X_ARGS</a></div><div class="ttdeci">#define DISP2X_ARGS</div><div class="ttdef"><b>Definition</b> dis.h:1070</div></div>
<div class="ttc" id="adis_8h_html_a27ab258e601dcfa4d184a35edbc590fd"><div class="ttname"><a href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fd">dis_errmsg_enum</a></div><div class="ttdeci">dis_errmsg_enum</div><div class="ttdef"><b>Definition</b> dis.h:1060</div></div>
<div class="ttc" id="adis_8h_html_a27ab258e601dcfa4d184a35edbc590fda7298d8c404456ac8c3a5365f2f266d80"><div class="ttname"><a href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fda7298d8c404456ac8c3a5365f2f266d80">DISERR_MEMORY</a></div><div class="ttdeci">@ DISERR_MEMORY</div><div class="ttdef"><b>Definition</b> dis.h:1063</div></div>
<div class="ttc" id="adis_8h_html_a27ab258e601dcfa4d184a35edbc590fda8c5a7d847d62520f972e51435d4d0d46"><div class="ttname"><a href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fda8c5a7d847d62520f972e51435d4d0d46">DISERR_NULL_POINTER</a></div><div class="ttdeci">@ DISERR_NULL_POINTER</div><div class="ttdef"><b>Definition</b> dis.h:1062</div></div>
<div class="ttc" id="adis_8h_html_a27ab258e601dcfa4d184a35edbc590fdabe0645cb8d4bfc0f496aa84336ca492a"><div class="ttname"><a href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fdabe0645cb8d4bfc0f496aa84336ca492a">DISERR_DEDISTORT</a></div><div class="ttdeci">@ DISERR_DEDISTORT</div><div class="ttdef"><b>Definition</b> dis.h:1066</div></div>
<div class="ttc" id="adis_8h_html_a27ab258e601dcfa4d184a35edbc590fdace3a5f769a3b8966f980f1279e2f08b0"><div class="ttname"><a href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fdace3a5f769a3b8966f980f1279e2f08b0">DISERR_BAD_PARAM</a></div><div class="ttdeci">@ DISERR_BAD_PARAM</div><div class="ttdef"><b>Definition</b> dis.h:1064</div></div>
<div class="ttc" id="adis_8h_html_a27ab258e601dcfa4d184a35edbc590fdadbabbc4a9fe6441177efcd050b4cc579"><div class="ttname"><a href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fdadbabbc4a9fe6441177efcd050b4cc579">DISERR_DISTORT</a></div><div class="ttdeci">@ DISERR_DISTORT</div><div class="ttdef"><b>Definition</b> dis.h:1065</div></div>
<div class="ttc" id="adis_8h_html_a27ab258e601dcfa4d184a35edbc590fdaeaef8bb1725ea601f43900897ee144a8"><div class="ttname"><a href="dis_8h.html#a27ab258e601dcfa4d184a35edbc590fdaeaef8bb1725ea601f43900897ee144a8">DISERR_SUCCESS</a></div><div class="ttdeci">@ DISERR_SUCCESS</div><div class="ttdef"><b>Definition</b> dis.h:1061</div></div>
<div class="ttc" id="adis_8h_html_a3e0e67bdd01c86eede779de63249c703"><div class="ttname"><a href="dis_8h.html#a3e0e67bdd01c86eede779de63249c703">disinit</a></div><div class="ttdeci">int disinit(int alloc, int naxis, struct disprm *dis, int ndpmax)</div><div class="ttdoc">Default constructor for the disprm struct.</div></div>
<div class="ttc" id="adis_8h_html_a42e03676a3def43ef6b936cd7beb4dd5"><div class="ttname"><a href="dis_8h.html#a42e03676a3def43ef6b936cd7beb4dd5">discpy</a></div><div class="ttdeci">int discpy(int alloc, const struct disprm *dissrc, struct disprm *disdst)</div><div class="ttdoc">Copy routine for the disprm struct.</div></div>
<div class="ttc" id="adis_8h_html_a44e73dd6831a2eb25f09d316d175875f"><div class="ttname"><a href="dis_8h.html#a44e73dd6831a2eb25f09d316d175875f">dpfill</a></div><div class="ttdeci">int dpfill(struct dpkey *dp, const char *keyword, const char *field, int j, int type, int i, double f)</div><div class="ttdoc">Fill the contents of a dpkey struct.</div></div>
<div class="ttc" id="adis_8h_html_a5fab5cff95ef5e505314a6fb67325074"><div class="ttname"><a href="dis_8h.html#a5fab5cff95ef5e505314a6fb67325074">dpkeyi</a></div><div class="ttdeci">int dpkeyi(const struct dpkey *dp)</div><div class="ttdoc">Get the data value in a dpkey struct as int.</div></div>
<div class="ttc" id="adis_8h_html_a6f07892abc6d9d73ee9017750dc7bd8d"><div class="ttname"><a href="dis_8h.html#a6f07892abc6d9d73ee9017750dc7bd8d">dissize</a></div><div class="ttdeci">int dissize(const struct disprm *dis, int sizes[2])</div><div class="ttdoc">Compute the size of a disprm struct.</div></div>
<div class="ttc" id="adis_8h_html_a6f125a402553f5dab46435299f0742a3"><div class="ttname"><a href="dis_8h.html#a6f125a402553f5dab46435299f0742a3">dis_errmsg</a></div><div class="ttdeci">const char * dis_errmsg[]</div><div class="ttdoc">Status return messages.</div></div>
<div class="ttc" id="adis_8h_html_a83b98d0f6429f4f19024675645026187"><div class="ttname"><a href="dis_8h.html#a83b98d0f6429f4f19024675645026187">disfree</a></div><div class="ttdeci">int disfree(struct disprm *dis)</div><div class="ttdoc">Destructor for the disprm struct.</div></div>
<div class="ttc" id="adis_8h_html_a8896e2a5330e55cd85da4a28ed6ee463"><div class="ttname"><a href="dis_8h.html#a8896e2a5330e55cd85da4a28ed6ee463">disini</a></div><div class="ttdeci">int disini(int alloc, int naxis, struct disprm *dis)</div><div class="ttdoc">Default constructor for the disprm struct.</div></div>
<div class="ttc" id="adis_8h_html_a91fa2d34c30be042516a0246d393b116"><div class="ttname"><a href="dis_8h.html#a91fa2d34c30be042516a0246d393b116">diswarp</a></div><div class="ttdeci">int diswarp(struct disprm *dis, const double pixblc[], const double pixtrc[], const double pixsamp[], int *nsamp, double maxdis[], double *maxtot, double avgdis[], double *avgtot, double rmsdis[], double *rmstot)</div><div class="ttdoc">Compute measures of distortion.</div></div>
<div class="ttc" id="adis_8h_html_aa5486b870327544f7423ad2751fb4120"><div class="ttname"><a href="dis_8h.html#aa5486b870327544f7423ad2751fb4120">disndp</a></div><div class="ttdeci">int disndp(int n)</div><div class="ttdoc">Memory allocation for DPja and DQia.</div></div>
<div class="ttc" id="adis_8h_html_ab69a8e21c3a3b7409458f681bd6ac888"><div class="ttname"><a href="dis_8h.html#ab69a8e21c3a3b7409458f681bd6ac888">dishdo</a></div><div class="ttdeci">int dishdo(struct disprm *dis)</div><div class="ttdoc">write FITS headers using TPD.</div></div>
<div class="ttc" id="adis_8h_html_ac589d5e85afe3d775cba4c06734ce653"><div class="ttname"><a href="dis_8h.html#ac589d5e85afe3d775cba4c06734ce653">disx2p</a></div><div class="ttdeci">int disx2p(struct disprm *dis, const double discrd[], double rawcrd[])</div><div class="ttdoc">Apply de-distortion function.</div></div>
<div class="ttc" id="adis_8h_html_ac593cd79fb7f89b1c7395d0ecf2f7876"><div class="ttname"><a href="dis_8h.html#ac593cd79fb7f89b1c7395d0ecf2f7876">DISX2P_ARGS</a></div><div class="ttdeci">#define DISX2P_ARGS</div><div class="ttdef"><b>Definition</b> dis.h:1074</div></div>
<div class="ttc" id="adis_8h_html_acc9e98282026d5a249c450f2d2c0f2f4"><div class="ttname"><a href="dis_8h.html#acc9e98282026d5a249c450f2d2c0f2f4">disperr</a></div><div class="ttdeci">int disperr(const struct disprm *dis, const char *prefix)</div><div class="ttdoc">Print error messages from a disprm struct.</div></div>
<div class="ttc" id="adis_8h_html_ad1bdf4497eb4513ca8431e1baa419041"><div class="ttname"><a href="dis_8h.html#ad1bdf4497eb4513ca8431e1baa419041">disset</a></div><div class="ttdeci">int disset(struct disprm *dis)</div><div class="ttdoc">Setup routine for the disprm struct.</div></div>
<div class="ttc" id="adis_8h_html_aeee35e0d5183e74f20c64526d908886b"><div class="ttname"><a href="dis_8h.html#aeee35e0d5183e74f20c64526d908886b">disprt</a></div><div class="ttdeci">int disprt(const struct disprm *dis)</div><div class="ttdoc">Print routine for the disprm struct.</div></div>
<div class="ttc" id="astructdisprm_html"><div class="ttname"><a href="structdisprm.html">disprm</a></div><div class="ttdoc">Distortion parameters.</div><div class="ttdef"><b>Definition</b> dis.h:1093</div></div>
<div class="ttc" id="astructdisprm_html_a10a16217368a5cdd34d802fff442f383"><div class="ttname"><a href="structdisprm.html#a10a16217368a5cdd34d802fff442f383">disprm::totdis</a></div><div class="ttdeci">double totdis</div><div class="ttdef"><b>Definition</b> dis.h:1106</div></div>
<div class="ttc" id="astructdisprm_html_a1c5120a5905e79191adf6d98bdc63e50"><div class="ttname"><a href="structdisprm.html#a1c5120a5905e79191adf6d98bdc63e50">disprm::iparm</a></div><div class="ttdeci">int ** iparm</div><div class="ttdef"><b>Definition</b> dis.h:1118</div></div>
<div class="ttc" id="astructdisprm_html_a1f7b541d7130698acc6781b7ca83dab8"><div class="ttname"><a href="structdisprm.html#a1f7b541d7130698acc6781b7ca83dab8">disprm::scale</a></div><div class="ttdeci">double ** scale</div><div class="ttdef"><b>Definition</b> dis.h:1117</div></div>
<div class="ttc" id="astructdisprm_html_a201bc2948f326bbed9a0e1f818720ef9"><div class="ttname"><a href="structdisprm.html#a201bc2948f326bbed9a0e1f818720ef9">disprm::naxis</a></div><div class="ttdeci">int naxis</div><div class="ttdef"><b>Definition</b> dis.h:1100</div></div>
<div class="ttc" id="astructdisprm_html_a40a81085335f9d9aa617eb9605ae9421"><div class="ttname"><a href="structdisprm.html#a40a81085335f9d9aa617eb9605ae9421">disprm::err</a></div><div class="ttdeci">struct wcserr * err</div><div class="ttdef"><b>Definition</b> dis.h:1127</div></div>
<div class="ttc" id="astructdisprm_html_a434f7952a43eba6485c03335179a25a7"><div class="ttname"><a href="structdisprm.html#a434f7952a43eba6485c03335179a25a7">disprm::dtype</a></div><div class="ttdeci">char(* dtype)[72]</div><div class="ttdef"><b>Definition</b> dis.h:1102</div></div>
<div class="ttc" id="astructdisprm_html_a4d6ba28bee2fc636f4b2b9ca4b50b0a4"><div class="ttname"><a href="structdisprm.html#a4d6ba28bee2fc636f4b2b9ca4b50b0a4">disprm::flag</a></div><div class="ttdeci">int flag</div><div class="ttdef"><b>Definition</b> dis.h:1096</div></div>
<div class="ttc" id="astructdisprm_html_a4f692b3bb436ceab5861ec9566d127e4"><div class="ttname"><a href="structdisprm.html#a4f692b3bb436ceab5861ec9566d127e4">disprm::m_maxdis</a></div><div class="ttdeci">double * m_maxdis</div><div class="ttdef"><b>Definition</b> dis.h:1137</div></div>
<div class="ttc" id="astructdisprm_html_a51ff2cd3afbfdaed9da115f2f46f3ff9"><div class="ttname"><a href="structdisprm.html#a51ff2cd3afbfdaed9da115f2f46f3ff9">disprm::i_naxis</a></div><div class="ttdeci">int i_naxis</div><div class="ttdef"><b>Definition</b> dis.h:1122</div></div>
<div class="ttc" id="astructdisprm_html_a52c639193240123e66b75e68a9a26add"><div class="ttname"><a href="structdisprm.html#a52c639193240123e66b75e68a9a26add">disprm::disp2x</a></div><div class="ttdeci">int(** disp2x)(DISP2X_ARGS)</div><div class="ttdef"><b>Definition</b> dis.h:1131</div></div>
<div class="ttc" id="astructdisprm_html_a6307557409cf4679a176f16b7dc14b7f"><div class="ttname"><a href="structdisprm.html#a6307557409cf4679a176f16b7dc14b7f">disprm::ndpmax</a></div><div class="ttdeci">int ndpmax</div><div class="ttdef"><b>Definition</b> dis.h:1104</div></div>
<div class="ttc" id="astructdisprm_html_a6a8b2e3fc58d8f21668a82a93b199712"><div class="ttname"><a href="structdisprm.html#a6a8b2e3fc58d8f21668a82a93b199712">disprm::m_naxis</a></div><div class="ttdeci">int m_naxis</div><div class="ttdef"><b>Definition</b> dis.h:1134</div></div>
<div class="ttc" id="astructdisprm_html_a71567452603ef3effc07877e7366a5b2"><div class="ttname"><a href="structdisprm.html#a71567452603ef3effc07877e7366a5b2">disprm::dp</a></div><div class="ttdeci">struct dpkey * dp</div><div class="ttdef"><b>Definition</b> dis.h:1105</div></div>
<div class="ttc" id="astructdisprm_html_a7fae0b75ba71ee0eaafaa1d3a20cc6af"><div class="ttname"><a href="structdisprm.html#a7fae0b75ba71ee0eaafaa1d3a20cc6af">disprm::ndis</a></div><div class="ttdeci">int ndis</div><div class="ttdef"><b>Definition</b> dis.h:1123</div></div>
<div class="ttc" id="astructdisprm_html_a896bb8ce24e1b3cab7179eeaa0cfa2d4"><div class="ttname"><a href="structdisprm.html#a896bb8ce24e1b3cab7179eeaa0cfa2d4">disprm::docorr</a></div><div class="ttdeci">int * docorr</div><div class="ttdef"><b>Definition</b> dis.h:1111</div></div>
<div class="ttc" id="astructdisprm_html_a8b0ac30436d7bb3e12e0ca1c64fda337"><div class="ttname"><a href="structdisprm.html#a8b0ac30436d7bb3e12e0ca1c64fda337">disprm::offset</a></div><div class="ttdeci">double ** offset</div><div class="ttdef"><b>Definition</b> dis.h:1116</div></div>
<div class="ttc" id="astructdisprm_html_a9649d0399d35dbad2c90127f8c7eeb75"><div class="ttname"><a href="structdisprm.html#a9649d0399d35dbad2c90127f8c7eeb75">disprm::m_dtype</a></div><div class="ttdeci">char(* m_dtype)[72]</div><div class="ttdef"><b>Definition</b> dis.h:1135</div></div>
<div class="ttc" id="astructdisprm_html_a9775ace81c64bf04c0fbe5b750bc2a79"><div class="ttname"><a href="structdisprm.html#a9775ace81c64bf04c0fbe5b750bc2a79">disprm::dparm</a></div><div class="ttdeci">double ** dparm</div><div class="ttdef"><b>Definition</b> dis.h:1120</div></div>
<div class="ttc" id="astructdisprm_html_ab62d14319c82c93c70d290728cab78c4"><div class="ttname"><a href="structdisprm.html#ab62d14319c82c93c70d290728cab78c4">disprm::axmap</a></div><div class="ttdeci">int ** axmap</div><div class="ttdef"><b>Definition</b> dis.h:1115</div></div>
<div class="ttc" id="astructdisprm_html_abea82d3433ef561c144dfe1f481e51b3"><div class="ttname"><a href="structdisprm.html#abea82d3433ef561c144dfe1f481e51b3">disprm::m_dp</a></div><div class="ttdeci">struct dpkey * m_dp</div><div class="ttdef"><b>Definition</b> dis.h:1136</div></div>
<div class="ttc" id="astructdisprm_html_ac107b9b4c645a461036476290a87ab22"><div class="ttname"><a href="structdisprm.html#ac107b9b4c645a461036476290a87ab22">disprm::maxdis</a></div><div class="ttdeci">double * maxdis</div><div class="ttdef"><b>Definition</b> dis.h:1107</div></div>
<div class="ttc" id="astructdisprm_html_acac42172b4486502e27e1b6e198c557f"><div class="ttname"><a href="structdisprm.html#acac42172b4486502e27e1b6e198c557f">disprm::ndp</a></div><div class="ttdeci">int ndp</div><div class="ttdef"><b>Definition</b> dis.h:1103</div></div>
<div class="ttc" id="astructdisprm_html_ae438b6d2aaea0e6b97c3a3377d6904f3"><div class="ttname"><a href="structdisprm.html#ae438b6d2aaea0e6b97c3a3377d6904f3">disprm::disx2p</a></div><div class="ttdeci">int(** disx2p)(DISX2P_ARGS)</div><div class="ttdef"><b>Definition</b> dis.h:1132</div></div>
<div class="ttc" id="astructdisprm_html_af0fa6585e8b763cc0dcbe3775ca504a7"><div class="ttname"><a href="structdisprm.html#af0fa6585e8b763cc0dcbe3775ca504a7">disprm::Nhat</a></div><div class="ttdeci">int * Nhat</div><div class="ttdef"><b>Definition</b> dis.h:1112</div></div>
<div class="ttc" id="astructdisprm_html_afb5079136a7ec5ae4effef9790e31439"><div class="ttname"><a href="structdisprm.html#afb5079136a7ec5ae4effef9790e31439">disprm::m_flag</a></div><div class="ttdeci">int m_flag</div><div class="ttdef"><b>Definition</b> dis.h:1134</div></div>
<div class="ttc" id="astructdpkey_html"><div class="ttname"><a href="structdpkey.html">dpkey</a></div><div class="ttdoc">Store for DPja and DQia keyvalues.</div><div class="ttdef"><b>Definition</b> dis.h:1079</div></div>
<div class="ttc" id="astructdpkey_html_a18c6c3caf495a1f57ef0cb1e800e974f"><div class="ttname"><a href="structdpkey.html#a18c6c3caf495a1f57ef0cb1e800e974f">dpkey::value</a></div><div class="ttdeci">union dpkey::@0 value</div></div>
<div class="ttc" id="astructdpkey_html_a1fa8264c0a1237e9e4303058d3633569"><div class="ttname"><a href="structdpkey.html#a1fa8264c0a1237e9e4303058d3633569">dpkey::i</a></div><div class="ttdeci">int i</div><div class="ttdef"><b>Definition</b> dis.h:1084</div></div>
<div class="ttc" id="astructdpkey_html_a7585bc8185c349dc4e13b7964606933e"><div class="ttname"><a href="structdpkey.html#a7585bc8185c349dc4e13b7964606933e">dpkey::field</a></div><div class="ttdeci">char field[72]</div><div class="ttdef"><b>Definition</b> dis.h:1080</div></div>
<div class="ttc" id="astructdpkey_html_adce16b786bbb5d4663e9cb201b124a0e"><div class="ttname"><a href="structdpkey.html#adce16b786bbb5d4663e9cb201b124a0e">dpkey::type</a></div><div class="ttdeci">int type</div><div class="ttdef"><b>Definition</b> dis.h:1082</div></div>
<div class="ttc" id="astructdpkey_html_aeab33684c9284d0d73757224b32a6d73"><div class="ttname"><a href="structdpkey.html#aeab33684c9284d0d73757224b32a6d73">dpkey::j</a></div><div class="ttdeci">int j</div><div class="ttdef"><b>Definition</b> dis.h:1081</div></div>
<div class="ttc" id="astructdpkey_html_af662dfc2d66f2803d73583780079281a"><div class="ttname"><a href="structdpkey.html#af662dfc2d66f2803d73583780079281a">dpkey::f</a></div><div class="ttdeci">double f</div><div class="ttdef"><b>Definition</b> dis.h:1085</div></div>
<div class="ttc" id="astructwcserr_html"><div class="ttname"><a href="structwcserr.html">wcserr</a></div><div class="ttdoc">Error message handling.</div><div class="ttdef"><b>Definition</b> wcserr.h:243</div></div>
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