wcslib (8.2.2)
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<a href="cel_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: cel.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 cel 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 the part of 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 that deals with celestial coordinates, as described in</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 world coordinates in FITS",</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span><span class="comment">= Greisen, E.W., & Calabretta, M.R. 2002, A&A, 395, 1061 (WCS Paper I)</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="comment">=</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span><span class="comment">= "Representations of celestial coordinates in FITS",</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span><span class="comment">= Calabretta, M.R., & Greisen, E.W. 2002, A&A, 395, 1077 (WCS Paper II)</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span><span class="comment">*</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span><span class="comment">* These routines define methods to be used for computing celestial world</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span><span class="comment">* coordinates from intermediate world coordinates (a linear transformation</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="comment">* of image pixel coordinates), and vice versa. They are based on the celprm</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span><span class="comment">* struct which contains all information needed for the computations. This</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span><span class="comment">* struct contains some elements that must be set by the user, and others that</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span><span class="comment">* are maintained by these routines, somewhat like a C++ class but with no</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span><span class="comment">* encapsulation.</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">* Routine celini() is provided to initialize the celprm struct with default</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span><span class="comment">* values, celfree() reclaims any memory that may have been allocated to store</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span><span class="comment">* an error message, celsize() computes its total size including allocated</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span><span class="comment">* memory, and celprt() prints its contents.</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span><span class="comment">*</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span><span class="comment">* celperr() prints the error message(s), if any, stored in a celprm struct and</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span><span class="comment">* the prjprm struct that it contains.</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">* A setup routine, celset(), computes intermediate values in the celprm struct</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span><span class="comment">* from parameters in it that were supplied by the user. The struct always</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span><span class="comment">* needs to be set up by celset() but it need not be called explicitly - refer</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span><span class="comment">* to the explanation of celprm::flag.</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span><span class="comment">*</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span><span class="comment">* celx2s() and cels2x() implement the WCS celestial coordinate</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span><span class="comment">* transformations. In fact, they are high level driver routines for the lower</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span><span class="comment">* level spherical coordinate rotation and projection routines described in</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span><span class="comment">* sph.h and prj.h.</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span><span class="comment">*</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span><span class="comment">*</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span><span class="comment">* celini() - Default constructor for the celprm struct</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span><span class="comment">* ----------------------------------------------------</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span><span class="comment">* celini() sets all members of a celprm struct to default values. It should</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span><span class="comment">* be used to initialize every celprm struct.</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span><span class="comment">*</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span><span class="comment">* PLEASE NOTE: If the celprm struct has already been initialized, then before</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span><span class="comment">* reinitializing, it celfree() should be used to free any memory that may have</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span><span class="comment">* been allocated to store an error message. A memory leak may otherwise</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span><span class="comment">* result.</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span><span class="comment">*</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span><span class="comment">* cel struct celprm*</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span><span class="comment">* Celestial transformation parameters.</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">* Function return value:</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span><span class="comment">* 1: Null celprm pointer passed.</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span><span class="comment">*</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">* celfree() - Destructor for the celprm struct</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span><span class="comment">* --------------------------------------------</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span><span class="comment">* celfree() frees any memory that may have been allocated to store an error</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span><span class="comment">* message in the celprm struct.</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span><span class="comment">*</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span><span class="comment">* cel struct celprm*</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span><span class="comment">* Celestial transformation parameters.</span></div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span><span class="comment">*</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span><span class="comment">* 1: Null celprm pointer passed.</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">*</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span><span class="comment">* celsize() - Compute the size of a celprm struct</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span><span class="comment">* -----------------------------------------------</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span><span class="comment">* celsize() computes the full size of a celprm struct, including allocated</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span><span class="comment">* memory.</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span><span class="comment">*</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span><span class="comment">* cel const struct celprm*</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span><span class="comment">* Celestial transformation parameters.</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span><span class="comment">*</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span><span class="comment">* If NULL, the base size of the struct and the allocated</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span><span class="comment">* size are both set to zero.</span></div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span><span class="comment">*</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</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="l00117" name="l00117"></a><span class="lineno"> 117</span><span class="comment">* returned by sizeof(struct celprm). The second element</span></div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span><span class="comment">* is the total allocated size, in bytes. This figure</span></div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span><span class="comment">* includes memory allocated for the constituent struct,</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span><span class="comment">* celprm::err.</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">* It is not an error for the struct not to have been set</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span><span class="comment">* up via celset().</span></div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span><span class="comment">*</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span><span class="comment">*</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span><span class="comment">*</span></div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span><span class="comment">* celprt() - Print routine for the celprm struct</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">* celprt() prints the contents of a celprm struct using wcsprintf(). Mainly</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span><span class="comment">* intended for diagnostic purposes.</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span><span class="comment">*</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span><span class="comment">* cel const struct celprm*</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span><span class="comment">* Celestial transformation parameters.</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span><span class="comment">*</span></div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span><span class="comment">* 1: Null celprm pointer passed.</span></div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span><span class="comment">*</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">* celperr() - Print error messages from a celprm struct</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span><span class="comment">* -----------------------------------------------------</span></div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span><span class="comment">* celperr() prints the error message(s), if any, stored in a celprm struct and</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span><span class="comment">* the prjprm struct that it contains. If there are no errors then nothing is</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span><span class="comment">* printed. It uses wcserr_prt(), q.v.</span></div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span><span class="comment">*</span></div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span><span class="comment">* cel const struct celprm*</span></div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span><span class="comment">* Coordinate transformation parameters.</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span><span class="comment">*</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span><span class="comment">* prefix const char *</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span><span class="comment">* If non-NULL, each output line will be prefixed with</span></div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span><span class="comment">* this string.</span></div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span><span class="comment">*</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span><span class="comment">* 1: Null celprm pointer passed.</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span><span class="comment">*</span></div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span><span class="comment">*</span></div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span><span class="comment">* celset() - Setup routine for the celprm struct</span></div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span><span class="comment">* ----------------------------------------------</span></div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span><span class="comment">* celset() sets up a celprm struct according to information supplied within</span></div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span><span class="comment">* it.</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 this routine need not be called directly; it will be invoked by</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span><span class="comment">* celx2s() and cels2x() if celprm::flag is anything other than a predefined</span></div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span><span class="comment">* magic value.</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">* Given and returned:</span></div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span><span class="comment">* cel struct celprm*</span></div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span><span class="comment">* Celestial transformation parameters.</span></div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"> 177</span><span class="comment">*</span></div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span><span class="comment">* 1: Null celprm pointer passed.</span></div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span><span class="comment">* 2: Invalid projection parameters.</span></div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span><span class="comment">* 3: Invalid coordinate transformation parameters.</span></div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span><span class="comment">* 4: Ill-conditioned coordinate transformation</span></div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span><span class="comment">* parameters.</span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span><span class="comment">*</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span><span class="comment">* For returns > 1, a detailed error message is set in</span></div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"> 188</span><span class="comment">* celprm::err if enabled, see wcserr_enable().</span></div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span><span class="comment">*</span></div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span><span class="comment">*</span></div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span><span class="comment">* celx2s() - Pixel-to-world celestial transformation</span></div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span><span class="comment">* --------------------------------------------------</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span><span class="comment">* celx2s() transforms (x,y) coordinates in the plane of projection to</span></div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span><span class="comment">* celestial coordinates (lng,lat).</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">* Given and returned:</span></div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span><span class="comment">* cel struct celprm*</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"> 198</span><span class="comment">* Celestial transformation parameters.</span></div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"> 199</span><span class="comment">*</span></div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno"> 200</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno"> 201</span><span class="comment">* nx,ny int Vector lengths.</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">* sxy,sll int Vector strides.</span></div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span><span class="comment">*</span></div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span><span class="comment">* x,y const double[]</span></div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"> 206</span><span class="comment">* Projected coordinates in pseudo "degrees".</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">* Returned:</span></div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno"> 209</span><span class="comment">* phi,theta double[] Longitude and latitude (phi,theta) in the native</span></div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno"> 210</span><span class="comment">* coordinate system of the projection [deg].</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno"> 211</span><span class="comment">*</span></div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno"> 212</span><span class="comment">* lng,lat double[] Celestial longitude and latitude (lng,lat) of the</span></div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno"> 213</span><span class="comment">* projected point [deg].</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">* stat int[] Status return value for each vector element:</span></div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno"> 216</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno"> 217</span><span class="comment">* 1: Invalid value of (x,y).</span></div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno"> 218</span><span class="comment">*</span></div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno"> 219</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno"> 220</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno"> 221</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno"> 222</span><span class="comment">* 1: Null celprm pointer passed.</span></div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno"> 223</span><span class="comment">* 2: Invalid projection parameters.</span></div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno"> 224</span><span class="comment">* 3: Invalid coordinate transformation parameters.</span></div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno"> 225</span><span class="comment">* 4: Ill-conditioned coordinate transformation</span></div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno"> 226</span><span class="comment">* parameters.</span></div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno"> 227</span><span class="comment">* 5: One or more of the (x,y) coordinates were</span></div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno"> 228</span><span class="comment">* invalid, as indicated by the stat vector.</span></div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno"> 229</span><span class="comment">*</span></div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno"> 230</span><span class="comment">* For returns > 1, a detailed error message is set in</span></div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno"> 231</span><span class="comment">* celprm::err if enabled, see wcserr_enable().</span></div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno"> 232</span><span class="comment">*</span></div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno"> 233</span><span class="comment">*</span></div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno"> 234</span><span class="comment">* cels2x() - World-to-pixel celestial transformation</span></div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno"> 235</span><span class="comment">* --------------------------------------------------</span></div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno"> 236</span><span class="comment">* cels2x() transforms celestial coordinates (lng,lat) to (x,y) coordinates in</span></div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno"> 237</span><span class="comment">* the plane of projection.</span></div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno"> 238</span><span class="comment">*</span></div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno"> 239</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno"> 240</span><span class="comment">* cel struct celprm*</span></div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno"> 241</span><span class="comment">* Celestial transformation parameters.</span></div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno"> 242</span><span class="comment">*</span></div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno"> 243</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno"> 244</span><span class="comment">* nlng,nlat int Vector lengths.</span></div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno"> 245</span><span class="comment">*</span></div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno"> 246</span><span class="comment">* sll,sxy int Vector strides.</span></div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno"> 247</span><span class="comment">*</span></div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno"> 248</span><span class="comment">* lng,lat const double[]</span></div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno"> 249</span><span class="comment">* Celestial longitude and latitude (lng,lat) of the</span></div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno"> 250</span><span class="comment">* projected point [deg].</span></div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno"> 251</span><span class="comment">*</span></div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno"> 252</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno"> 253</span><span class="comment">* phi,theta double[] Longitude and latitude (phi,theta) in the native</span></div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno"> 254</span><span class="comment">* coordinate system of the projection [deg].</span></div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno"> 255</span><span class="comment">*</span></div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno"> 256</span><span class="comment">* x,y double[] Projected coordinates in pseudo "degrees".</span></div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno"> 257</span><span class="comment">*</span></div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno"> 258</span><span class="comment">* stat int[] Status return value for each vector element:</span></div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno"> 259</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno"> 260</span><span class="comment">* 1: Invalid value of (lng,lat).</span></div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno"> 261</span><span class="comment">*</span></div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno"> 262</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno"> 263</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno"> 264</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno"> 265</span><span class="comment">* 1: Null celprm pointer passed.</span></div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno"> 266</span><span class="comment">* 2: Invalid projection parameters.</span></div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno"> 267</span><span class="comment">* 3: Invalid coordinate transformation parameters.</span></div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno"> 268</span><span class="comment">* 4: Ill-conditioned coordinate transformation</span></div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno"> 269</span><span class="comment">* parameters.</span></div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno"> 270</span><span class="comment">* 6: One or more of the (lng,lat) coordinates were</span></div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno"> 271</span><span class="comment">* invalid, as indicated by the stat vector.</span></div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno"> 272</span><span class="comment">*</span></div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno"> 273</span><span class="comment">* For returns > 1, a detailed error message is set in</span></div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno"> 274</span><span class="comment">* celprm::err if enabled, see wcserr_enable().</span></div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno"> 275</span><span class="comment">*</span></div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno"> 276</span><span class="comment">*</span></div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno"> 277</span><span class="comment">* celprm struct - Celestial transformation parameters</span></div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno"> 278</span><span class="comment">* ---------------------------------------------------</span></div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno"> 279</span><span class="comment">* The celprm struct contains information required to transform celestial</span></div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno"> 280</span><span class="comment">* coordinates. It consists of certain members that must be set by the user</span></div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno"> 281</span><span class="comment">* ("given") and others that are set by the WCSLIB routines ("returned"). Some</span></div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno"> 282</span><span class="comment">* of the latter are supplied for informational purposes and others are for</span></div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno"> 283</span><span class="comment">* internal use only.</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">* Returned celprm struct members must not be modified by the user.</span></div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno"> 286</span><span class="comment">*</span></div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno"> 287</span><span class="comment">* int flag</span></div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno"> 288</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="l00289" name="l00289"></a><span class="lineno"> 289</span><span class="comment">* following celprm struct members are set or changed:</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">* - celprm::offset,</span></div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno"> 292</span><span class="comment">* - celprm::phi0,</span></div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno"> 293</span><span class="comment">* - celprm::theta0,</span></div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno"> 294</span><span class="comment">* - celprm::ref[4],</span></div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno"> 295</span><span class="comment">* - celprm::prj:</span></div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno"> 296</span><span class="comment">* - prjprm::code,</span></div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno"> 297</span><span class="comment">* - prjprm::r0,</span></div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno"> 298</span><span class="comment">* - prjprm::pv[],</span></div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno"> 299</span><span class="comment">* - prjprm::phi0,</span></div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno"> 300</span><span class="comment">* - prjprm::theta0.</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">* This signals the initialization routine, celset(), to recompute the</span></div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno"> 303</span><span class="comment">* returned members of the celprm struct. celset() will reset flag to</span></div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno"> 304</span><span class="comment">* indicate that this has been done.</span></div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno"> 305</span><span class="comment">*</span></div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno"> 306</span><span class="comment">* int offset</span></div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno"> 307</span><span class="comment">* (Given) If true (non-zero), an offset will be applied to (x,y) to</span></div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno"> 308</span><span class="comment">* force (x,y) = (0,0) at the fiducial point, (phi_0,theta_0).</span></div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno"> 309</span><span class="comment">* Default is 0 (false).</span></div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno"> 310</span><span class="comment">*</span></div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno"> 311</span><span class="comment">* double phi0</span></div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno"> 312</span><span class="comment">* (Given) The native longitude, phi_0 [deg], and ...</span></div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno"> 313</span><span class="comment">*</span></div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno"> 314</span><span class="comment">* double theta0</span></div>
<div class="line"><a id="l00315" name="l00315"></a><span class="lineno"> 315</span><span class="comment">* (Given) ... the native latitude, theta_0 [deg], of the fiducial point,</span></div>
<div class="line"><a id="l00316" name="l00316"></a><span class="lineno"> 316</span><span class="comment">* i.e. the point whose celestial coordinates are given in</span></div>
<div class="line"><a id="l00317" name="l00317"></a><span class="lineno"> 317</span><span class="comment">* celprm::ref[1:2]. If undefined (set to a magic value by prjini()) the</span></div>
<div class="line"><a id="l00318" name="l00318"></a><span class="lineno"> 318</span><span class="comment">* initialization routine, celset(), will set this to a projection-specific</span></div>
<div class="line"><a id="l00319" name="l00319"></a><span class="lineno"> 319</span><span class="comment">* default.</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">* double ref[4]</span></div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno"> 322</span><span class="comment">* (Given) The first pair of values should be set to the celestial</span></div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno"> 323</span><span class="comment">* longitude and latitude of the fiducial point [deg] - typically right</span></div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno"> 324</span><span class="comment">* ascension and declination. These are given by the CRVALia keywords in</span></div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno"> 325</span><span class="comment">* FITS.</span></div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno"> 326</span><span class="comment">*</span></div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno"> 327</span><span class="comment">* (Given and returned) The second pair of values are the native longitude,</span></div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno"> 328</span><span class="comment">* phi_p [deg], and latitude, theta_p [deg], of the celestial pole (the</span></div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno"> 329</span><span class="comment">* latter is the same as the celestial latitude of the native pole,</span></div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno"> 330</span><span class="comment">* delta_p) and these are given by the FITS keywords LONPOLEa and LATPOLEa</span></div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno"> 331</span><span class="comment">* (or by PVi_2a and PVi_3a attached to the longitude axis which take</span></div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno"> 332</span><span class="comment">* precedence if defined).</span></div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno"> 333</span><span class="comment">*</span></div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno"> 334</span><span class="comment">* LONPOLEa defaults to phi_0 (see above) if the celestial latitude of the</span></div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno"> 335</span><span class="comment">* fiducial point of the projection is greater than or equal to the native</span></div>
<div class="line"><a id="l00336" name="l00336"></a><span class="lineno"> 336</span><span class="comment">* latitude, otherwise phi_0 + 180 [deg]. (This is the condition for the</span></div>
<div class="line"><a id="l00337" name="l00337"></a><span class="lineno"> 337</span><span class="comment">* celestial latitude to increase in the same direction as the native</span></div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno"> 338</span><span class="comment">* latitude at the fiducial point.) ref[2] may be set to UNDEFINED (from</span></div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno"> 339</span><span class="comment">* wcsmath.h) or 999.0 to indicate that the correct default should be</span></div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno"> 340</span><span class="comment">* substituted.</span></div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno"> 341</span><span class="comment">*</span></div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno"> 342</span><span class="comment">* theta_p, the native latitude of the celestial pole (or equally the</span></div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno"> 343</span><span class="comment">* celestial latitude of the native pole, delta_p) is often determined</span></div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno"> 344</span><span class="comment">* uniquely by CRVALia and LONPOLEa in which case LATPOLEa is ignored.</span></div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno"> 345</span><span class="comment">* However, in some circumstances there are two valid solutions for theta_p</span></div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno"> 346</span><span class="comment">* and LATPOLEa is used to choose between them. LATPOLEa is set in ref[3]</span></div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno"> 347</span><span class="comment">* and the solution closest to this value is used to reset ref[3]. It is</span></div>
<div class="line"><a id="l00348" name="l00348"></a><span class="lineno"> 348</span><span class="comment">* therefore legitimate, for example, to set ref[3] to +90.0 to choose the</span></div>
<div class="line"><a id="l00349" name="l00349"></a><span class="lineno"> 349</span><span class="comment">* more northerly solution - the default if the LATPOLEa keyword is omitted</span></div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno"> 350</span><span class="comment">* from the FITS header. For the special case where the fiducial point of</span></div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno"> 351</span><span class="comment">* the projection is at native latitude zero, its celestial latitude is</span></div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno"> 352</span><span class="comment">* zero, and LONPOLEa = +/- 90.0 then the celestial latitude of the native</span></div>
<div class="line"><a id="l00353" name="l00353"></a><span class="lineno"> 353</span><span class="comment">* pole is not determined by the first three reference values and LATPOLEa</span></div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno"> 354</span><span class="comment">* specifies it completely.</span></div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno"> 355</span><span class="comment">*</span></div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno"> 356</span><span class="comment">* The returned value, celprm::latpreq, specifies how LATPOLEa was actually</span></div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno"> 357</span><span class="comment">* used.</span></div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno"> 358</span><span class="comment">*</span></div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno"> 359</span><span class="comment">* struct prjprm prj</span></div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno"> 360</span><span class="comment">* (Given and returned) Projection parameters described in the prologue to</span></div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno"> 361</span><span class="comment">* prj.h.</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">* double euler[5]</span></div>
<div class="line"><a id="l00364" name="l00364"></a><span class="lineno"> 364</span><span class="comment">* (Returned) Euler angles and associated intermediaries derived from the</span></div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno"> 365</span><span class="comment">* coordinate reference values. The first three values are the Z-, X-, and</span></div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno"> 366</span><span class="comment">* Z'-Euler angles [deg], and the remaining two are the cosine and sine of</span></div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno"> 367</span><span class="comment">* the X-Euler angle.</span></div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno"> 368</span><span class="comment">*</span></div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno"> 369</span><span class="comment">* int latpreq</span></div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno"> 370</span><span class="comment">* (Returned) For informational purposes, this indicates how the LATPOLEa</span></div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno"> 371</span><span class="comment">* keyword was used</span></div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno"> 372</span><span class="comment">* - 0: Not required, theta_p (== delta_p) was determined uniquely by the</span></div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno"> 373</span><span class="comment">* CRVALia and LONPOLEa keywords.</span></div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno"> 374</span><span class="comment">* - 1: Required to select between two valid solutions of theta_p.</span></div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno"> 375</span><span class="comment">* - 2: theta_p was specified solely by LATPOLEa.</span></div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno"> 376</span><span class="comment">*</span></div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno"> 377</span><span class="comment">* int isolat</span></div>
<div class="line"><a id="l00378" name="l00378"></a><span class="lineno"> 378</span><span class="comment">* (Returned) True if the spherical rotation preserves the magnitude of the</span></div>
<div class="line"><a id="l00379" name="l00379"></a><span class="lineno"> 379</span><span class="comment">* latitude, which occurs iff the axes of the native and celestial</span></div>
<div class="line"><a id="l00380" name="l00380"></a><span class="lineno"> 380</span><span class="comment">* coordinates are coincident. It signals an opportunity to cache</span></div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno"> 381</span><span class="comment">* intermediate calculations common to all elements in a vector</span></div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno"> 382</span><span class="comment">* computation.</span></div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno"> 383</span><span class="comment">*</span></div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno"> 384</span><span class="comment">* struct wcserr *err</span></div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno"> 385</span><span class="comment">* (Returned) If enabled, when an error status is returned, this struct</span></div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno"> 386</span><span class="comment">* contains detailed information about the error, see wcserr_enable().</span></div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno"> 387</span><span class="comment">*</span></div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno"> 388</span><span class="comment">* void *padding</span></div>
<div class="line"><a id="l00389" name="l00389"></a><span class="lineno"> 389</span><span class="comment">* (An unused variable inserted for alignment purposes only.)</span></div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno"> 390</span><span class="comment">*</span></div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno"> 391</span><span class="comment">* Global variable: const char *cel_errmsg[] - Status return messages</span></div>
<div class="line"><a id="l00392" name="l00392"></a><span class="lineno"> 392</span><span class="comment">* ------------------------------------------------------------------</span></div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno"> 393</span><span class="comment">* Status messages to match the status value returned from each function.</span></div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno"> 394</span><span class="comment">*</span></div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno"> 395</span><span class="comment">*===========================================================================*/</span></div>
<div class="line"><a id="l00396" name="l00396"></a><span class="lineno"> 396</span> </div>
<div class="line"><a id="l00397" name="l00397"></a><span class="lineno"> 397</span><span class="preprocessor">#ifndef WCSLIB_CEL</span></div>
<div class="line"><a id="l00398" name="l00398"></a><span class="lineno"> 398</span><span class="preprocessor">#define WCSLIB_CEL</span></div>
<div class="line"><a id="l00399" name="l00399"></a><span class="lineno"> 399</span> </div>
<div class="line"><a id="l00400" name="l00400"></a><span class="lineno"> 400</span><span class="preprocessor">#include "<a class="code" href="prj_8h.html">prj.h</a>"</span></div>
<div class="line"><a id="l00401" name="l00401"></a><span class="lineno"> 401</span> </div>
<div class="line"><a id="l00402" name="l00402"></a><span class="lineno"> 402</span><span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a id="l00403" name="l00403"></a><span class="lineno"> 403</span><span class="keyword">extern</span> <span class="stringliteral">"C"</span> {</div>
<div class="line"><a id="l00404" name="l00404"></a><span class="lineno"> 404</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00405" name="l00405"></a><span class="lineno"> 405</span> </div>
<div class="line"><a id="l00406" name="l00406"></a><span class="lineno"> 406</span> </div>
<div class="line"><a id="l00407" name="l00407"></a><span class="lineno"> 407</span><span class="keyword">extern</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a class="code hl_variable" href="cel_8h.html#a2ac33dbe3aa2efff60543213b0a691f5">cel_errmsg</a>[];</div>
<div class="line"><a id="l00408" name="l00408"></a><span class="lineno"> 408</span> </div>
<div class="foldopen" id="foldopen00409" data-start="{" data-end="};">
<div class="line"><a id="l00409" name="l00409"></a><span class="lineno"><a class="line" href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31"> 409</a></span><span class="keyword">enum</span> <a class="code hl_enumeration" href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31">cel_errmsg_enum</a> {</div>
<div class="line"><a id="l00410" name="l00410"></a><span class="lineno"><a class="line" href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31a4ca7a593593157772f3788801138dd12"> 410</a></span> <a class="code hl_enumvalue" href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31a4ca7a593593157772f3788801138dd12">CELERR_SUCCESS</a> = 0, <span class="comment">// Success.</span></div>
<div class="line"><a id="l00411" name="l00411"></a><span class="lineno"><a class="line" href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31a7fa1e5cb9c23e5f138638dad3f938e1e"> 411</a></span> <a class="code hl_enumvalue" href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31a7fa1e5cb9c23e5f138638dad3f938e1e">CELERR_NULL_POINTER</a> = 1, <span class="comment">// Null celprm pointer passed.</span></div>
<div class="line"><a id="l00412" name="l00412"></a><span class="lineno"><a class="line" href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31a33a743bdcdd17bae9c6961234ed6b642"> 412</a></span> <a class="code hl_enumvalue" href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31a33a743bdcdd17bae9c6961234ed6b642">CELERR_BAD_PARAM</a> = 2, <span class="comment">// Invalid projection parameters.</span></div>
<div class="line"><a id="l00413" name="l00413"></a><span class="lineno"><a class="line" href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31a367cf89b74764f9462bfa50c2eb50fb6"> 413</a></span> <a class="code hl_enumvalue" href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31a367cf89b74764f9462bfa50c2eb50fb6">CELERR_BAD_COORD_TRANS</a> = 3, <span class="comment">// Invalid coordinate transformation</span></div>
<div class="line"><a id="l00414" name="l00414"></a><span class="lineno"> 414</span> <span class="comment">// parameters.</span></div>
<div class="line"><a id="l00415" name="l00415"></a><span class="lineno"><a class="line" href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31acb1dec1ea393b198b93a26425ee901a2"> 415</a></span> <a class="code hl_enumvalue" href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31acb1dec1ea393b198b93a26425ee901a2">CELERR_ILL_COORD_TRANS</a> = 4, <span class="comment">// Ill-conditioned coordinated transformation</span></div>
<div class="line"><a id="l00416" name="l00416"></a><span class="lineno"> 416</span> <span class="comment">// parameters.</span></div>
<div class="line"><a id="l00417" name="l00417"></a><span class="lineno"><a class="line" href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31a44042efc5a9894182447dfcbcd24e1d4"> 417</a></span> <a class="code hl_enumvalue" href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31a44042efc5a9894182447dfcbcd24e1d4">CELERR_BAD_PIX</a> = 5, <span class="comment">// One or more of the (x,y) coordinates were</span></div>
<div class="line"><a id="l00418" name="l00418"></a><span class="lineno"> 418</span> <span class="comment">// invalid.</span></div>
<div class="line"><a id="l00419" name="l00419"></a><span class="lineno"> 419</span> <a class="code hl_enumvalue" href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31aac8beaf37d754d1a7a7aab5307a2140b">CELERR_BAD_WORLD</a> = 6 <span class="comment">// One or more of the (lng,lat) coordinates</span></div>
<div class="line"><a id="l00420" name="l00420"></a><span class="lineno"> 420</span> <span class="comment">// were invalid.</span></div>
<div class="line"><a id="l00421" name="l00421"></a><span class="lineno"><a class="line" href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31aac8beaf37d754d1a7a7aab5307a2140b"> 421</a></span>};</div>
</div>
<div class="line"><a id="l00422" name="l00422"></a><span class="lineno"> 422</span> </div>
<div class="foldopen" id="foldopen00423" data-start="{" data-end="};">
<div class="line"><a id="l00423" name="l00423"></a><span class="lineno"><a class="line" href="structcelprm.html"> 423</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structcelprm.html">celprm</a> {</div>
<div class="line"><a id="l00424" name="l00424"></a><span class="lineno"> 424</span> <span class="comment">// Initialization flag (see the prologue above).</span></div>
<div class="line"><a id="l00425" name="l00425"></a><span class="lineno"> 425</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l00426" name="l00426"></a><span class="lineno"><a class="line" href="structcelprm.html#a408a39c1d060d5b32f884f8a8c60aaa2"> 426</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structcelprm.html#a408a39c1d060d5b32f884f8a8c60aaa2">flag</a>; <span class="comment">// Set to zero to force initialization.</span></div>
<div class="line"><a id="l00427" name="l00427"></a><span class="lineno"> 427</span> </div>
<div class="line"><a id="l00428" name="l00428"></a><span class="lineno"> 428</span> <span class="comment">// Parameters to be provided (see the prologue above).</span></div>
<div class="line"><a id="l00429" name="l00429"></a><span class="lineno"> 429</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l00430" name="l00430"></a><span class="lineno"><a class="line" href="structcelprm.html#a74585275b64c292b394b74f2f19a8048"> 430</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structcelprm.html#a74585275b64c292b394b74f2f19a8048">offset</a>; <span class="comment">// Force (x,y) = (0,0) at (phi_0,theta_0).</span></div>
<div class="line"><a id="l00431" name="l00431"></a><span class="lineno"><a class="line" href="structcelprm.html#ab034f85dc785113c396c9864cdddfe52"> 431</a></span> <span class="keywordtype">double</span> <a class="code hl_variable" href="structcelprm.html#ab034f85dc785113c396c9864cdddfe52">phi0</a>, <a class="code hl_variable" href="structcelprm.html#a011e38b3a5505fdc13855348571bfad1">theta0</a>; <span class="comment">// Native coordinates of fiducial point.</span></div>
<div class="line"><a id="l00432" name="l00432"></a><span class="lineno"><a class="line" href="structcelprm.html#a3f9ae993e97f0e73e3f59117929eeda6"> 432</a></span> <span class="keywordtype">double</span> <a class="code hl_variable" href="structcelprm.html#a3f9ae993e97f0e73e3f59117929eeda6">ref</a>[4]; <span class="comment">// Celestial coordinates of fiducial</span></div>
<div class="line"><a id="l00433" name="l00433"></a><span class="lineno"> 433</span> <span class="comment">// point and native coordinates of</span></div>
<div class="line"><a id="l00434" name="l00434"></a><span class="lineno"> 434</span> <span class="comment">// celestial pole.</span></div>
<div class="line"><a id="l00435" name="l00435"></a><span class="lineno"> 435</span> </div>
<div class="line"><a id="l00436" name="l00436"></a><span class="lineno"><a class="line" href="structcelprm.html#abe1991f17c0ecb857d5bd30a6a689b84"> 436</a></span> <span class="keyword">struct </span><a class="code hl_struct" href="structprjprm.html">prjprm</a> <a class="code hl_variable" href="structcelprm.html#abe1991f17c0ecb857d5bd30a6a689b84">prj</a>; <span class="comment">// Projection parameters (see prj.h).</span></div>
<div class="line"><a id="l00437" name="l00437"></a><span class="lineno"> 437</span> </div>
<div class="line"><a id="l00438" name="l00438"></a><span class="lineno"> 438</span> <span class="comment">// Information derived from the parameters supplied.</span></div>
<div class="line"><a id="l00439" name="l00439"></a><span class="lineno"> 439</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l00440" name="l00440"></a><span class="lineno"><a class="line" href="structcelprm.html#a80ea2023638ededd2760cc9a260c456b"> 440</a></span> <span class="keywordtype">double</span> <a class="code hl_variable" href="structcelprm.html#a80ea2023638ededd2760cc9a260c456b">euler</a>[5]; <span class="comment">// Euler angles and functions thereof.</span></div>
<div class="line"><a id="l00441" name="l00441"></a><span class="lineno"><a class="line" href="structcelprm.html#a756c8f0991a748ab47361b0215c4577b"> 441</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structcelprm.html#a756c8f0991a748ab47361b0215c4577b">latpreq</a>; <span class="comment">// LATPOLEa requirement.</span></div>
<div class="line"><a id="l00442" name="l00442"></a><span class="lineno"><a class="line" href="structcelprm.html#a7bb5e1ff4d73c884d73eeb0f8f2677d7"> 442</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structcelprm.html#a7bb5e1ff4d73c884d73eeb0f8f2677d7">isolat</a>; <span class="comment">// True if |latitude| is preserved.</span></div>
<div class="line"><a id="l00443" name="l00443"></a><span class="lineno"> 443</span> </div>
<div class="line"><a id="l00444" name="l00444"></a><span class="lineno"> 444</span> <span class="comment">// Error handling</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"><a class="line" href="structcelprm.html#a1b9cbfd7cfa2306464d57dc4acd03b06"> 446</a></span> <span class="keyword">struct </span><a class="code hl_struct" href="structwcserr.html">wcserr</a> *<a class="code hl_variable" href="structcelprm.html#a1b9cbfd7cfa2306464d57dc4acd03b06">err</a>;</div>
<div class="line"><a id="l00447" name="l00447"></a><span class="lineno"> 447</span> </div>
<div class="line"><a id="l00448" name="l00448"></a><span class="lineno"> 448</span> <span class="comment">// Private</span></div>
<div class="line"><a id="l00449" name="l00449"></a><span class="lineno"> 449</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l00450" name="l00450"></a><span class="lineno"><a class="line" href="structcelprm.html#acab5a98c001b85a565b7976499c1739c"> 450</a></span> <span class="keywordtype">void</span> *<a class="code hl_variable" href="structcelprm.html#acab5a98c001b85a565b7976499c1739c">padding</a>; <span class="comment">// (Dummy inserted for alignment purposes.)</span></div>
<div class="line"><a id="l00451" name="l00451"></a><span class="lineno"> 451</span>};</div>
</div>
<div class="line"><a id="l00452" name="l00452"></a><span class="lineno"> 452</span> </div>
<div class="line"><a id="l00453" name="l00453"></a><span class="lineno"> 453</span><span class="comment">// Size of the celprm struct in int units, used by the Fortran wrappers.</span></div>
<div class="line"><a id="l00454" name="l00454"></a><span class="lineno"><a class="line" href="cel_8h.html#a055ad88aa219a0207e221d62e03d2e23"> 454</a></span><span class="preprocessor">#define CELLEN (sizeof(struct celprm)/sizeof(int))</span></div>
<div class="line"><a id="l00455" name="l00455"></a><span class="lineno"> 455</span> </div>
<div class="line"><a id="l00456" name="l00456"></a><span class="lineno"> 456</span> </div>
<div class="line"><a id="l00457" name="l00457"></a><span class="lineno"><a class="line" href="cel_8h.html#a1fe1b137ade45ea28e61f44d4708fb77"> 457</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="cel_8h.html#a1fe1b137ade45ea28e61f44d4708fb77">celini</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structcelprm.html">celprm</a> *cel);</div>
<div class="line"><a id="l00458" name="l00458"></a><span class="lineno"> 458</span> </div>
<div class="line"><a id="l00459" name="l00459"></a><span class="lineno"><a class="line" href="cel_8h.html#a39bb7bf8e545c200191d51884ecfb89b"> 459</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="cel_8h.html#a39bb7bf8e545c200191d51884ecfb89b">celfree</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structcelprm.html">celprm</a> *cel);</div>
<div class="line"><a id="l00460" name="l00460"></a><span class="lineno"> 460</span> </div>
<div class="line"><a id="l00461" name="l00461"></a><span class="lineno"><a class="line" href="cel_8h.html#a8b30f878e56ba62ca7f411e8275e0484"> 461</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="cel_8h.html#a8b30f878e56ba62ca7f411e8275e0484">celsize</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code hl_struct" href="structcelprm.html">celprm</a> *cel, <span class="keywordtype">int</span> sizes[2]);</div>
<div class="line"><a id="l00462" name="l00462"></a><span class="lineno"> 462</span> </div>
<div class="line"><a id="l00463" name="l00463"></a><span class="lineno"><a class="line" href="cel_8h.html#adb2e4565f61a9de5fe278d9035850dc3"> 463</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="cel_8h.html#adb2e4565f61a9de5fe278d9035850dc3">celprt</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code hl_struct" href="structcelprm.html">celprm</a> *cel);</div>
<div class="line"><a id="l00464" name="l00464"></a><span class="lineno"> 464</span> </div>
<div class="line"><a id="l00465" name="l00465"></a><span class="lineno"><a class="line" href="cel_8h.html#a8a8c50a25396bc2d8ff9b3a4e6d6e4c8"> 465</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="cel_8h.html#a8a8c50a25396bc2d8ff9b3a4e6d6e4c8">celperr</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code hl_struct" href="structcelprm.html">celprm</a> *cel, <span class="keyword">const</span> <span class="keywordtype">char</span> *prefix);</div>
<div class="line"><a id="l00466" name="l00466"></a><span class="lineno"> 466</span> </div>
<div class="line"><a id="l00467" name="l00467"></a><span class="lineno"><a class="line" href="cel_8h.html#ab0f67d1727750616f71c7bfcb3a037b6"> 467</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="cel_8h.html#ab0f67d1727750616f71c7bfcb3a037b6">celset</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structcelprm.html">celprm</a> *cel);</div>
<div class="line"><a id="l00468" name="l00468"></a><span class="lineno"> 468</span> </div>
<div class="line"><a id="l00469" name="l00469"></a><span class="lineno"><a class="line" href="cel_8h.html#a1fe7f134670262eb54b6049c0275a27b"> 469</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="cel_8h.html#a1fe7f134670262eb54b6049c0275a27b">celx2s</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structcelprm.html">celprm</a> *cel, <span class="keywordtype">int</span> nx, <span class="keywordtype">int</span> ny, <span class="keywordtype">int</span> sxy, <span class="keywordtype">int</span> sll,</div>
<div class="line"><a id="l00470" name="l00470"></a><span class="lineno"> 470</span> <span class="keyword">const</span> <span class="keywordtype">double</span> x[], <span class="keyword">const</span> <span class="keywordtype">double</span> y[],</div>
<div class="line"><a id="l00471" name="l00471"></a><span class="lineno"> 471</span> <span class="keywordtype">double</span> phi[], <span class="keywordtype">double</span> theta[], <span class="keywordtype">double</span> lng[], <span class="keywordtype">double</span> lat[],</div>
<div class="line"><a id="l00472" name="l00472"></a><span class="lineno"> 472</span> <span class="keywordtype">int</span> stat[]);</div>
<div class="line"><a id="l00473" name="l00473"></a><span class="lineno"> 473</span> </div>
<div class="line"><a id="l00474" name="l00474"></a><span class="lineno"><a class="line" href="cel_8h.html#a6661c05703158b0808038b7d551f1ea1"> 474</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="cel_8h.html#a6661c05703158b0808038b7d551f1ea1">cels2x</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structcelprm.html">celprm</a> *cel, <span class="keywordtype">int</span> nlng, <span class="keywordtype">int</span> nlat, <span class="keywordtype">int</span> sll, <span class="keywordtype">int</span> sxy,</div>
<div class="line"><a id="l00475" name="l00475"></a><span class="lineno"> 475</span> <span class="keyword">const</span> <span class="keywordtype">double</span> lng[], <span class="keyword">const</span> <span class="keywordtype">double</span> lat[],</div>
<div class="line"><a id="l00476" name="l00476"></a><span class="lineno"> 476</span> <span class="keywordtype">double</span> phi[], <span class="keywordtype">double</span> theta[], <span class="keywordtype">double</span> x[], <span class="keywordtype">double</span> y[],</div>
<div class="line"><a id="l00477" name="l00477"></a><span class="lineno"> 477</span> <span class="keywordtype">int</span> stat[]);</div>
<div class="line"><a id="l00478" name="l00478"></a><span class="lineno"> 478</span> </div>
<div class="line"><a id="l00479" name="l00479"></a><span class="lineno"> 479</span> </div>
<div class="line"><a id="l00480" name="l00480"></a><span class="lineno"> 480</span><span class="comment">// Deprecated.</span></div>
<div class="line"><a id="l00481" name="l00481"></a><span class="lineno"><a class="line" href="cel_8h.html#a0474e3e2d6c39249acbe58cedd573e84"> 481</a></span><span class="preprocessor">#define celini_errmsg cel_errmsg</span></div>
<div class="line"><a id="l00482" name="l00482"></a><span class="lineno"><a class="line" href="cel_8h.html#a9e188b582ee4eb815466e86bb684fc82"> 482</a></span><span class="preprocessor">#define celprt_errmsg cel_errmsg</span></div>
<div class="line"><a id="l00483" name="l00483"></a><span class="lineno"><a class="line" href="cel_8h.html#a2fe5a30084717036a54e7f0a920da105"> 483</a></span><span class="preprocessor">#define celset_errmsg cel_errmsg</span></div>
<div class="line"><a id="l00484" name="l00484"></a><span class="lineno"><a class="line" href="cel_8h.html#af72e24d2f169c3c343c55c880a74050f"> 484</a></span><span class="preprocessor">#define celx2s_errmsg cel_errmsg</span></div>
<div class="line"><a id="l00485" name="l00485"></a><span class="lineno"><a class="line" href="cel_8h.html#ac398f2bea2deac6d86c10a7b3efca966"> 485</a></span><span class="preprocessor">#define cels2x_errmsg cel_errmsg</span></div>
<div class="line"><a id="l00486" name="l00486"></a><span class="lineno"> 486</span> </div>
<div class="line"><a id="l00487" name="l00487"></a><span class="lineno"> 487</span><span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a id="l00488" name="l00488"></a><span class="lineno"> 488</span>}</div>
<div class="line"><a id="l00489" name="l00489"></a><span class="lineno"> 489</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00490" name="l00490"></a><span class="lineno"> 490</span> </div>
<div class="line"><a id="l00491" name="l00491"></a><span class="lineno"> 491</span><span class="preprocessor">#endif </span><span class="comment">// WCSLIB_CEL</span></div>
<div class="ttc" id="acel_8h_html_a1fe1b137ade45ea28e61f44d4708fb77"><div class="ttname"><a href="cel_8h.html#a1fe1b137ade45ea28e61f44d4708fb77">celini</a></div><div class="ttdeci">int celini(struct celprm *cel)</div><div class="ttdoc">Default constructor for the celprm struct.</div></div>
<div class="ttc" id="acel_8h_html_a1fe7f134670262eb54b6049c0275a27b"><div class="ttname"><a href="cel_8h.html#a1fe7f134670262eb54b6049c0275a27b">celx2s</a></div><div class="ttdeci">int celx2s(struct celprm *cel, int nx, int ny, int sxy, int sll, const double x[], const double y[], double phi[], double theta[], double lng[], double lat[], int stat[])</div><div class="ttdoc">Pixel-to-world celestial transformation.</div></div>
<div class="ttc" id="acel_8h_html_a2ac33dbe3aa2efff60543213b0a691f5"><div class="ttname"><a href="cel_8h.html#a2ac33dbe3aa2efff60543213b0a691f5">cel_errmsg</a></div><div class="ttdeci">const char * cel_errmsg[]</div></div>
<div class="ttc" id="acel_8h_html_a39bb7bf8e545c200191d51884ecfb89b"><div class="ttname"><a href="cel_8h.html#a39bb7bf8e545c200191d51884ecfb89b">celfree</a></div><div class="ttdeci">int celfree(struct celprm *cel)</div><div class="ttdoc">Destructor for the celprm struct.</div></div>
<div class="ttc" id="acel_8h_html_a6661c05703158b0808038b7d551f1ea1"><div class="ttname"><a href="cel_8h.html#a6661c05703158b0808038b7d551f1ea1">cels2x</a></div><div class="ttdeci">int cels2x(struct celprm *cel, int nlng, int nlat, int sll, int sxy, const double lng[], const double lat[], double phi[], double theta[], double x[], double y[], int stat[])</div><div class="ttdoc">World-to-pixel celestial transformation.</div></div>
<div class="ttc" id="acel_8h_html_a8a8c50a25396bc2d8ff9b3a4e6d6e4c8"><div class="ttname"><a href="cel_8h.html#a8a8c50a25396bc2d8ff9b3a4e6d6e4c8">celperr</a></div><div class="ttdeci">int celperr(const struct celprm *cel, const char *prefix)</div><div class="ttdoc">Print error messages from a celprm struct.</div></div>
<div class="ttc" id="acel_8h_html_a8b30f878e56ba62ca7f411e8275e0484"><div class="ttname"><a href="cel_8h.html#a8b30f878e56ba62ca7f411e8275e0484">celsize</a></div><div class="ttdeci">int celsize(const struct celprm *cel, int sizes[2])</div><div class="ttdoc">Compute the size of a celprm struct.</div></div>
<div class="ttc" id="acel_8h_html_ab0f67d1727750616f71c7bfcb3a037b6"><div class="ttname"><a href="cel_8h.html#ab0f67d1727750616f71c7bfcb3a037b6">celset</a></div><div class="ttdeci">int celset(struct celprm *cel)</div><div class="ttdoc">Setup routine for the celprm struct.</div></div>
<div class="ttc" id="acel_8h_html_ab20292954fb236dafb2cd78aee121c31"><div class="ttname"><a href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31">cel_errmsg_enum</a></div><div class="ttdeci">cel_errmsg_enum</div><div class="ttdef"><b>Definition</b> cel.h:409</div></div>
<div class="ttc" id="acel_8h_html_ab20292954fb236dafb2cd78aee121c31a33a743bdcdd17bae9c6961234ed6b642"><div class="ttname"><a href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31a33a743bdcdd17bae9c6961234ed6b642">CELERR_BAD_PARAM</a></div><div class="ttdeci">@ CELERR_BAD_PARAM</div><div class="ttdef"><b>Definition</b> cel.h:412</div></div>
<div class="ttc" id="acel_8h_html_ab20292954fb236dafb2cd78aee121c31a367cf89b74764f9462bfa50c2eb50fb6"><div class="ttname"><a href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31a367cf89b74764f9462bfa50c2eb50fb6">CELERR_BAD_COORD_TRANS</a></div><div class="ttdeci">@ CELERR_BAD_COORD_TRANS</div><div class="ttdef"><b>Definition</b> cel.h:413</div></div>
<div class="ttc" id="acel_8h_html_ab20292954fb236dafb2cd78aee121c31a44042efc5a9894182447dfcbcd24e1d4"><div class="ttname"><a href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31a44042efc5a9894182447dfcbcd24e1d4">CELERR_BAD_PIX</a></div><div class="ttdeci">@ CELERR_BAD_PIX</div><div class="ttdef"><b>Definition</b> cel.h:417</div></div>
<div class="ttc" id="acel_8h_html_ab20292954fb236dafb2cd78aee121c31a4ca7a593593157772f3788801138dd12"><div class="ttname"><a href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31a4ca7a593593157772f3788801138dd12">CELERR_SUCCESS</a></div><div class="ttdeci">@ CELERR_SUCCESS</div><div class="ttdef"><b>Definition</b> cel.h:410</div></div>
<div class="ttc" id="acel_8h_html_ab20292954fb236dafb2cd78aee121c31a7fa1e5cb9c23e5f138638dad3f938e1e"><div class="ttname"><a href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31a7fa1e5cb9c23e5f138638dad3f938e1e">CELERR_NULL_POINTER</a></div><div class="ttdeci">@ CELERR_NULL_POINTER</div><div class="ttdef"><b>Definition</b> cel.h:411</div></div>
<div class="ttc" id="acel_8h_html_ab20292954fb236dafb2cd78aee121c31aac8beaf37d754d1a7a7aab5307a2140b"><div class="ttname"><a href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31aac8beaf37d754d1a7a7aab5307a2140b">CELERR_BAD_WORLD</a></div><div class="ttdeci">@ CELERR_BAD_WORLD</div><div class="ttdef"><b>Definition</b> cel.h:419</div></div>
<div class="ttc" id="acel_8h_html_ab20292954fb236dafb2cd78aee121c31acb1dec1ea393b198b93a26425ee901a2"><div class="ttname"><a href="cel_8h.html#ab20292954fb236dafb2cd78aee121c31acb1dec1ea393b198b93a26425ee901a2">CELERR_ILL_COORD_TRANS</a></div><div class="ttdeci">@ CELERR_ILL_COORD_TRANS</div><div class="ttdef"><b>Definition</b> cel.h:415</div></div>
<div class="ttc" id="acel_8h_html_adb2e4565f61a9de5fe278d9035850dc3"><div class="ttname"><a href="cel_8h.html#adb2e4565f61a9de5fe278d9035850dc3">celprt</a></div><div class="ttdeci">int celprt(const struct celprm *cel)</div><div class="ttdoc">Print routine for the celprm struct.</div></div>
<div class="ttc" id="aprj_8h_html"><div class="ttname"><a href="prj_8h.html">prj.h</a></div></div>
<div class="ttc" id="astructcelprm_html"><div class="ttname"><a href="structcelprm.html">celprm</a></div><div class="ttdoc">Celestial transformation parameters.</div><div class="ttdef"><b>Definition</b> cel.h:423</div></div>
<div class="ttc" id="astructcelprm_html_a011e38b3a5505fdc13855348571bfad1"><div class="ttname"><a href="structcelprm.html#a011e38b3a5505fdc13855348571bfad1">celprm::theta0</a></div><div class="ttdeci">double theta0</div><div class="ttdef"><b>Definition</b> cel.h:431</div></div>
<div class="ttc" id="astructcelprm_html_a1b9cbfd7cfa2306464d57dc4acd03b06"><div class="ttname"><a href="structcelprm.html#a1b9cbfd7cfa2306464d57dc4acd03b06">celprm::err</a></div><div class="ttdeci">struct wcserr * err</div><div class="ttdef"><b>Definition</b> cel.h:446</div></div>
<div class="ttc" id="astructcelprm_html_a3f9ae993e97f0e73e3f59117929eeda6"><div class="ttname"><a href="structcelprm.html#a3f9ae993e97f0e73e3f59117929eeda6">celprm::ref</a></div><div class="ttdeci">double ref[4]</div><div class="ttdef"><b>Definition</b> cel.h:432</div></div>
<div class="ttc" id="astructcelprm_html_a408a39c1d060d5b32f884f8a8c60aaa2"><div class="ttname"><a href="structcelprm.html#a408a39c1d060d5b32f884f8a8c60aaa2">celprm::flag</a></div><div class="ttdeci">int flag</div><div class="ttdef"><b>Definition</b> cel.h:426</div></div>
<div class="ttc" id="astructcelprm_html_a74585275b64c292b394b74f2f19a8048"><div class="ttname"><a href="structcelprm.html#a74585275b64c292b394b74f2f19a8048">celprm::offset</a></div><div class="ttdeci">int offset</div><div class="ttdef"><b>Definition</b> cel.h:430</div></div>
<div class="ttc" id="astructcelprm_html_a756c8f0991a748ab47361b0215c4577b"><div class="ttname"><a href="structcelprm.html#a756c8f0991a748ab47361b0215c4577b">celprm::latpreq</a></div><div class="ttdeci">int latpreq</div><div class="ttdef"><b>Definition</b> cel.h:441</div></div>
<div class="ttc" id="astructcelprm_html_a7bb5e1ff4d73c884d73eeb0f8f2677d7"><div class="ttname"><a href="structcelprm.html#a7bb5e1ff4d73c884d73eeb0f8f2677d7">celprm::isolat</a></div><div class="ttdeci">int isolat</div><div class="ttdef"><b>Definition</b> cel.h:442</div></div>
<div class="ttc" id="astructcelprm_html_a80ea2023638ededd2760cc9a260c456b"><div class="ttname"><a href="structcelprm.html#a80ea2023638ededd2760cc9a260c456b">celprm::euler</a></div><div class="ttdeci">double euler[5]</div><div class="ttdef"><b>Definition</b> cel.h:440</div></div>
<div class="ttc" id="astructcelprm_html_ab034f85dc785113c396c9864cdddfe52"><div class="ttname"><a href="structcelprm.html#ab034f85dc785113c396c9864cdddfe52">celprm::phi0</a></div><div class="ttdeci">double phi0</div><div class="ttdef"><b>Definition</b> cel.h:431</div></div>
<div class="ttc" id="astructcelprm_html_abe1991f17c0ecb857d5bd30a6a689b84"><div class="ttname"><a href="structcelprm.html#abe1991f17c0ecb857d5bd30a6a689b84">celprm::prj</a></div><div class="ttdeci">struct prjprm prj</div><div class="ttdef"><b>Definition</b> cel.h:436</div></div>
<div class="ttc" id="astructcelprm_html_acab5a98c001b85a565b7976499c1739c"><div class="ttname"><a href="structcelprm.html#acab5a98c001b85a565b7976499c1739c">celprm::padding</a></div><div class="ttdeci">void * padding</div><div class="ttdef"><b>Definition</b> cel.h:450</div></div>
<div class="ttc" id="astructprjprm_html"><div class="ttname"><a href="structprjprm.html">prjprm</a></div><div class="ttdoc">Projection parameters.</div><div class="ttdef"><b>Definition</b> prj.h:698</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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