wcslib (8.2.2)
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<a href="wcslib_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: wcslib.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">* Summary of wcslib.h</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="comment">* -------------------</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="comment">* This header file is provided purely for convenience. Use it to include all</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span><span class="comment">* of the separate WCSLIB headers.</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="comment">*</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> </div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span><span class="preprocessor">#ifndef WCSLIB_WCSLIB</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="preprocessor">#define WCSLIB_WCSLIB</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> </div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span><span class="preprocessor">#include "<a class="code" href="cel_8h.html">cel.h</a>"</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span><span class="preprocessor">#include "<a class="code" href="dis_8h.html">dis.h</a>"</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span><span class="preprocessor">#include "<a class="code" href="fitshdr_8h.html">fitshdr.h</a>"</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span><span class="preprocessor">#include "<a class="code" href="lin_8h.html">lin.h</a>"</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="preprocessor">#include "<a class="code" href="log_8h.html">log.h</a>"</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span><span class="preprocessor">#include "<a class="code" href="prj_8h.html">prj.h</a>"</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span><span class="preprocessor">#include "<a class="code" href="spc_8h.html">spc.h</a>"</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span><span class="preprocessor">#include "<a class="code" href="sph_8h.html">sph.h</a>"</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span><span class="preprocessor">#include "<a class="code" href="spx_8h.html">spx.h</a>"</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span><span class="preprocessor">#include "<a class="code" href="tab_8h.html">tab.h</a>"</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span><span class="preprocessor">#include "<a class="code" href="wcs_8h.html">wcs.h</a>"</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span><span class="preprocessor">#include "<a class="code" href="wcserr_8h.html">wcserr.h</a>"</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span><span class="preprocessor">#include "<a class="code" href="wcsfix_8h.html">wcsfix.h</a>"</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span><span class="preprocessor">#include "<a class="code" href="wcshdr_8h.html">wcshdr.h</a>"</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span><span class="preprocessor">#include "<a class="code" href="wcsmath_8h.html">wcsmath.h</a>"</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span><span class="preprocessor">#include "<a class="code" href="wcsprintf_8h.html">wcsprintf.h</a>"</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span><span class="preprocessor">#include "<a class="code" href="wcstrig_8h.html">wcstrig.h</a>"</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span><span class="preprocessor">#include "<a class="code" href="wcsunits_8h.html">wcsunits.h</a>"</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span><span class="preprocessor">#include "<a class="code" href="wcsutil_8h.html">wcsutil.h</a>"</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span><span class="preprocessor">#include "<a class="code" href="wtbarr_8h.html">wtbarr.h</a>"</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> </div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span><span class="preprocessor">#endif </span><span class="comment">// WCSLIB_WCSLIB</span></div>
<div class="line"><a id="l03603" name="l03603"></a><span class="lineno"> 3603</span> wcserr_enable(1);</div>
<div class="line"><a id="l03604" name="l03604"></a><span class="lineno"> 3604</span> <a class="code hl_function" href="wcsprintf_8h.html#a5c6f91916a0b8f8c2d85274c0ba130f6">wcsprintf_set</a>(stderr);</div>
<div class="line"><a id="l03605" name="l03605"></a><span class="lineno"> 3605</span> </div>
<div class="line"><a id="l03606" name="l03606"></a><span class="lineno"> 3606</span> ...</div>
<div class="line"><a id="l03607" name="l03607"></a><span class="lineno"> 3607</span> </div>
<div class="line"><a id="l03608" name="l03608"></a><span class="lineno"> 3608</span> <span class="keywordflow">if</span> (<a class="code hl_function" href="wcs_8h.html#ae5cc3f5d249755583403cdf54d2ebb91">wcsset</a>(&wcs) {</div>
<div class="line"><a id="l03609" name="l03609"></a><span class="lineno"> 3609</span> <a class="code hl_function" href="wcs_8h.html#a8fe5dcd9927240dc0348b850ee662367">wcsperr</a>(&wcs);</div>
<div class="line"><a id="l03610" name="l03610"></a><span class="lineno"> 3610</span> <span class="keywordflow">return</span> wcs.err->status;</div>
<div class="line"><a id="l03611" name="l03611"></a><span class="lineno"> 3611</span> }</div>
<div class="line"><a id="l03612" name="l03612"></a><span class="lineno"> 3612</span><span class="keyword">@end</span>verbatim</div>
<div class="line"><a id="l03613" name="l03613"></a><span class="lineno"> 3613</span>In <span class="keyword">this</span> example, <span class="keywordflow">if</span> an error was generated in one of the <a class="code hl_function" href="prj_8h.html#ad43dbc765c63162d0af2b9285b8a434f">prjset</a>() functions,</div>
<div class="line"><a id="l03614" name="l03614"></a><span class="lineno"> 3614</span><a class="code hl_function" href="wcs_8h.html#a8fe5dcd9927240dc0348b850ee662367">wcsperr</a>() would print an error traceback starting with <a class="code hl_function" href="wcs_8h.html#ae5cc3f5d249755583403cdf54d2ebb91">wcsset</a>(), then</div>
<div class="line"><a id="l03615" name="l03615"></a><span class="lineno"> 3615</span><a class="code hl_function" href="cel_8h.html#ab0f67d1727750616f71c7bfcb3a037b6">celset</a>(), and finally the particular projection-setting function that</div>
<div class="line"><a id="l03616" name="l03616"></a><span class="lineno"> 3616</span>generated the error. For each of them it would print the status return value,</div>
<div class="line"><a id="l03617" name="l03617"></a><span class="lineno"> 3617</span>function name, source file, line number, and an error message which may be</div>
<div class="line"><a id="l03618" name="l03618"></a><span class="lineno"> 3618</span>more specific and informative than the general error messages reported in the</div>
<div class="line"><a id="l03619" name="l03619"></a><span class="lineno"> 3619</span>first example. For example, in response to a deliberately generated error,</div>
<div class="line"><a id="l03620" name="l03620"></a><span class="lineno"> 3620</span>the @c twcs test program, which tests <a class="code hl_struct" href="structwcserr.html">wcserr</a> among other things, produces a</div>
<div class="line"><a id="l03621" name="l03621"></a><span class="lineno"> 3621</span>traceback similar to this:</div>
<div class="line"><a id="l03622" name="l03622"></a><span class="lineno"> 3622</span>@verbatim</div>
<div class="line"><a id="l03623" name="l03623"></a><span class="lineno"> 3623</span>ERROR 5 in <a class="code hl_function" href="wcs_8h.html#ae5cc3f5d249755583403cdf54d2ebb91">wcsset</a>() at line 1564 of file wcs.c:</div>
<div class="line"><a id="l03624" name="l03624"></a><span class="lineno"> 3624</span> Invalid parameter value.</div>
<div class="line"><a id="l03625" name="l03625"></a><span class="lineno"> 3625</span>ERROR 2 in <a class="code hl_function" href="cel_8h.html#ab0f67d1727750616f71c7bfcb3a037b6">celset</a>() at line 196 of file cel.c:</div>
<div class="line"><a id="l03626" name="l03626"></a><span class="lineno"> 3626</span> Invalid projection parameters.</div>
<div class="line"><a id="l03627" name="l03627"></a><span class="lineno"> 3627</span>ERROR 2 in <a class="code hl_function" href="prj_8h.html#aaec02a8e47d68e126983e9bb07a0c0aa">bonset</a>() at line 5727 of file prj.c:</div>
<div class="line"><a id="l03628" name="l03628"></a><span class="lineno"> 3628</span> Invalid parameters for Bonne's projection.</div>
<div class="line"><a id="l03629" name="l03629"></a><span class="lineno"> 3629</span>@endverbatim</div>
<div class="line"><a id="l03630" name="l03630"></a><span class="lineno"> 3630</span> </div>
<div class="line"><a id="l03631" name="l03631"></a><span class="lineno"> 3631</span>Each of the @ref structs "structs" in @ref overview "WCSLIB" includes a</div>
<div class="line"><a id="l03632" name="l03632"></a><span class="lineno"> 3632</span>pointer, called @a err, to a <a class="code hl_struct" href="structwcserr.html">wcserr</a> struct. When an error occurs, a struct is</div>
<div class="line"><a id="l03633" name="l03633"></a><span class="lineno"> 3633</span>allocated and error information stored in it. The <a class="code hl_struct" href="structwcserr.html">wcserr</a> pointers and the</div>
<div class="line"><a id="l03634" name="l03634"></a><span class="lineno"> 3634</span>@ref memory "memory" allocated for them are managed by the routines that</div>
<div class="line"><a id="l03635" name="l03635"></a><span class="lineno"> 3635</span>manage the various structs such as <a class="code hl_function" href="wcs_8h.html#aab11243b60b10065fc85347bb3efa912">wcsinit</a>() and <a class="code hl_function" href="wcs_8h.html#a4ab38bc642c4656f62c43acf84a849f1">wcsfree</a>().</div>
<div class="line"><a id="l03636" name="l03636"></a><span class="lineno"> 3636</span> </div>
<div class="line"><a id="l03637" name="l03637"></a><span class="lineno"> 3637</span><a class="code hl_struct" href="structwcserr.html">wcserr</a> messaging is an opt-in system enabled via <a class="code hl_function" href="wcserr_8h.html#a1691b8bd184d40ca6fda255be078fa53">wcserr_enable</a>(), as in the</div>
<div class="line"><a id="l03638" name="l03638"></a><span class="lineno"> 3638</span>example above. If enabled, when an error occurs it is the user's</div>
<div class="line"><a id="l03639" name="l03639"></a><span class="lineno"> 3639</span>responsibility to free the memory allocated for the error message using</div>
<div class="line"><a id="l03640" name="l03640"></a><span class="lineno"> 3640</span><a class="code hl_function" href="wcs_8h.html#a4ab38bc642c4656f62c43acf84a849f1">wcsfree</a>(), <a class="code hl_function" href="cel_8h.html#a39bb7bf8e545c200191d51884ecfb89b">celfree</a>(), <a class="code hl_function" href="prj_8h.html#a50db1538981df162709b81be0b2961ab">prjfree</a>(), etc. Failure to do so before the struct goes</div>
<div class="line"><a id="l03641" name="l03641"></a><span class="lineno"> 3641</span>out of scope will result in memory leaks (if execution continues beyond the</div>
<div class="line"><a id="l03642" name="l03642"></a><span class="lineno"> 3642</span>error).</div>
<div class="line"><a id="l03643" name="l03643"></a><span class="lineno"> 3643</span>*/</div>
<div class="line"><a id="l03644" name="l03644"></a><span class="lineno"> 3644</span> </div>
<div class="line"><a id="l03645" name="l03645"></a><span class="lineno"> 3645</span> </div>
<div class="ttc" id="acel_8h_html"><div class="ttname"><a href="cel_8h.html">cel.h</a></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_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="adis_8h_html"><div class="ttname"><a href="dis_8h.html">dis.h</a></div></div>
<div class="ttc" id="afitshdr_8h_html"><div class="ttname"><a href="fitshdr_8h.html">fitshdr.h</a></div></div>
<div class="ttc" id="alin_8h_html"><div class="ttname"><a href="lin_8h.html">lin.h</a></div></div>
<div class="ttc" id="alog_8h_html"><div class="ttname"><a href="log_8h.html">log.h</a></div></div>
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