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<a href="wcstrig_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*============================================================================</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"></span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> WCSLIB 4.18 - an implementation of the FITS WCS standard.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> Copyright (C) 1995-2013, Mark Calabretta</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"></span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> This file is part of WCSLIB.</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"></span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> WCSLIB is free software: you can redistribute it and/or modify it under the</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> terms of the GNU Lesser General Public License as published by the Free</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> Software Foundation, either version 3 of the License, or (at your option)</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> any later version.</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"></span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> WCSLIB is distributed in the hope that it will be useful, but WITHOUT ANY</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> more details.</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"></span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> You should have received a copy of the GNU Lesser General Public License</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> along with WCSLIB. If not, see http://www.gnu.org/licenses.</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"></span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> Direct correspondence concerning WCSLIB to mark@calabretta.id.au</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"></span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> http://www.atnf.csiro.au/people/Mark.Calabretta</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> $Id: wcstrig.h,v 4.18 2013/07/13 10:00:04 mcalabre Exp $</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment">*=============================================================================</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment">*</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">* Summary of the wcstrig routines</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">* -------------------------------</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">* When dealing with celestial coordinate systems and spherical projections</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">* (some moreso than others) it is often desirable to use an angular measure</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">* that provides an exact representation of the latitude of the north or south</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment">* pole. The WCSLIB routines use the following trigonometric functions that</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">* take or return angles in degrees:</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">*</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment">* - cosd()</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment">* - sind()</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment">* - tand()</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment">* - acosd()</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment">* - asind()</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment">* - atand()</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment">* - atan2d()</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment">* - sincosd()</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment">*</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment">* These "trigd" routines are expected to handle angles that are a multiple of</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment">* 90 degrees returning an exact result. Some C implementations provide these</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment">* as part of a system library and in such cases it may (or may not!) be</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">* preferable to use them. WCSLIB provides wrappers on the standard trig</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment">* functions based on radian measure, adding tests for multiples of 90 degrees.</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment">*</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment">* However, wcstrig.h also provides the choice of using preprocessor macro</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment">* implementations of the trigd functions that don't test for multiples of</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment">* 90 degrees (compile with -DWCSTRIG_MACRO). These are typically 20% faster</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment">* but may lead to problems near the poles.</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment">*</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment">*</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment">* cosd() - Cosine of an angle in degrees</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment">* --------------------------------------</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment">* cosd() returns the cosine of an angle given in degrees.</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment">*</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment">* Given:</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment">* angle double [deg].</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment">*</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment">* Function return value:</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment">* double Cosine of the angle.</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment">*</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment">*</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment">* sind() - Sine of an angle in degrees</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment">* ------------------------------------</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment">* sind() returns the sine of an angle given in degrees.</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment">*</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment">* Given:</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment">* angle double [deg].</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment">*</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment">* Function return value:</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment">* double Sine of the angle.</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment">*</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment">*</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment">* sincosd() - Sine and cosine of an angle in degrees</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment">* --------------------------------------------------</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment">* sincosd() returns the sine and cosine of an angle given in degrees.</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment">*</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment">* Given:</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment">* angle double [deg].</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment">*</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment">* Returned:</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment">* sin *double Sine of the angle.</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment">*</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment">* cos *double Cosine of the angle.</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment">*</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment">* Function return value:</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment">* void</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment">*</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment">*</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment">* tand() - Tangent of an angle in degrees</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment">* ---------------------------------------</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment">* tand() returns the tangent of an angle given in degrees.</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment">*</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment">* Given:</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment">* angle double [deg].</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment">*</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment">* Function return value:</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment">* double Tangent of the angle.</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment">*</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment">*</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="comment">* acosd() - Inverse cosine, returning angle in degrees</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="comment">* ----------------------------------------------------</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment">* acosd() returns the inverse cosine in degrees.</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment">*</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <span class="comment">* Given:</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment">* x double in the range [-1,1].</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="comment">*</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="comment">* Function return value:</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment">* double Inverse cosine of x [deg].</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment">*</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment">*</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment">* asind() - Inverse sine, returning angle in degrees</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment">* --------------------------------------------------</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment">* asind() returns the inverse sine in degrees.</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment">*</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment">* Given:</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="comment">* y double in the range [-1,1].</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment">*</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="comment">* Function return value:</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="comment">* double Inverse sine of y [deg].</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="comment">*</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="comment">*</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="comment">* atand() - Inverse tangent, returning angle in degrees</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="comment">* -----------------------------------------------------</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment">* atand() returns the inverse tangent in degrees.</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="comment">*</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment">* Given:</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="comment">* s double</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="comment">*</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment">* Function return value:</span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment">* double Inverse tangent of s [deg].</span></div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="comment">*</span></div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment">*</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment">* atan2d() - Polar angle of (x,y), in degrees</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="comment">* -------------------------------------------</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="comment">* atan2d() returns the polar angle, beta, in degrees, of polar coordinates</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="comment">* (rho,beta) corresponding Cartesian coordinates (x,y). It is equivalent to</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment">* the arg(x,y) function of WCS Paper II, though with transposed arguments.</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="comment">*</span></div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment">* Given:</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="comment">* y double Cartesian y-coordinate.</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="comment">*</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="comment">* x double Cartesian x-coordinate.</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> <span class="comment">*</span></div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="comment">* Function return value:</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="comment">* double Polar angle of (x,y) [deg].</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="comment">*</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="comment">*===========================================================================*/</span></div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> </div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="preprocessor">#ifndef WCSLIB_WCSTRIG</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="preprocessor"></span><span class="preprocessor">#define WCSLIB_WCSTRIG</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="preprocessor">#include <math.h></span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> </div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> <span class="preprocessor">#include "wcsconfig.h"</span></div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> </div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> <span class="preprocessor">#ifdef HAVE_SINCOS</span></div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="preprocessor"></span> <span class="keywordtype">void</span> sincos(<span class="keywordtype">double</span> angle, <span class="keywordtype">double</span> *sin, <span class="keywordtype">double</span> *cos);</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> <span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="preprocessor"></span><span class="keyword">extern</span> <span class="stringliteral">"C"</span> {</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> </div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <span class="preprocessor">#ifdef WCSTRIG_MACRO</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> <span class="comment">/* Macro implementation of the trigd functions. */</span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <span class="preprocessor">#include "<a class="code" href="wcsmath_8h.html">wcsmath.h</a>"</span></div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> </div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> <span class="preprocessor">#define cosd(X) cos((X)*D2R)</span></div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="preprocessor"></span><span class="preprocessor">#define sind(X) sin((X)*D2R)</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="preprocessor"></span><span class="preprocessor">#define tand(X) tan((X)*D2R)</span></div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> <span class="preprocessor"></span><span class="preprocessor">#define acosd(X) acos(X)*R2D</span></div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> <span class="preprocessor"></span><span class="preprocessor">#define asind(X) asin(X)*R2D</span></div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> <span class="preprocessor"></span><span class="preprocessor">#define atand(X) atan(X)*R2D</span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> <span class="preprocessor"></span><span class="preprocessor">#define atan2d(Y,X) atan2(Y,X)*R2D</span></div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> <span class="preprocessor"></span><span class="preprocessor">#ifdef HAVE_SINCOS</span></div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> <span class="preprocessor"></span><span class="preprocessor"> #define sincosd(X,S,C) sincos((X)*D2R,(S),(C))</span></div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> <span class="preprocessor"></span><span class="preprocessor">#else</span></div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span> <span class="preprocessor"></span><span class="preprocessor"> #define sincosd(X,S,C) *(S) = sin((X)*D2R); *(C) = cos((X)*D2R);</span></div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> <span class="preprocessor"></span><span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> <span class="comment">/* Use WCSLIB wrappers or native trigd functions. */</span></div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> </div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> <span class="keywordtype">double</span> <a class="code" href="wcstrig_8h.html#a42ae26d339f06986ca7f12ba02abcd32" title="Cosine of an angle in degrees. ">cosd</a>(<span class="keywordtype">double</span> angle);</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> <span class="keywordtype">double</span> <a class="code" href="wcstrig_8h.html#a2b83ceb814c90ebfa042a26d884ac159" title="Sine of an angle in degrees. ">sind</a>(<span class="keywordtype">double</span> angle);</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="keywordtype">void</span> <a class="code" href="wcstrig_8h.html#aee847369fa66666bfe1e72e7872499b6" title="Sine and cosine of an angle in degrees. ">sincosd</a>(<span class="keywordtype">double</span> angle, <span class="keywordtype">double</span> *sin, <span class="keywordtype">double</span> *cos);</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="keywordtype">double</span> <a class="code" href="wcstrig_8h.html#a666bbac788099d5bc6d88e685f2713a3" title="Tangent of an angle in degrees. ">tand</a>(<span class="keywordtype">double</span> angle);</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> <span class="keywordtype">double</span> <a class="code" href="wcstrig_8h.html#ab4e520246350c50275f899c9b97c68d3" title="Inverse cosine, returning angle in degrees. ">acosd</a>(<span class="keywordtype">double</span> x);</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="keywordtype">double</span> <a class="code" href="wcstrig_8h.html#a7a2ae59365f19adb4af90f4df3074e50" title="Inverse sine, returning angle in degrees. ">asind</a>(<span class="keywordtype">double</span> y);</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> <span class="keywordtype">double</span> <a class="code" href="wcstrig_8h.html#a872bdab5707df527946ecbad24ee03ab" title="Inverse tangent, returning angle in degrees. ">atand</a>(<span class="keywordtype">double</span> s);</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> <span class="keywordtype">double</span> <a class="code" href="wcstrig_8h.html#ad029e98723548c7236e805c7b48c7c90" title="Polar angle of , in degrees. ">atan2d</a>(<span class="keywordtype">double</span> y, <span class="keywordtype">double</span> x);</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> </div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> <span class="comment">/* Domain tolerance for asin() and acos() functions. */</span></div>
<div class="line"><a name="l00203"></a><span class="lineno"><a class="code" href="wcstrig_8h.html#add1b8466211aa6885bed0619f32b35c7"> 203</a></span> <span class="preprocessor">#define WCSTRIG_TOL 1e-10</span></div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span> <span class="preprocessor">#endif </span><span class="comment">/* WCSTRIG_MACRO */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> </div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span> <span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span> <span class="preprocessor"></span>}</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> <span class="preprocessor">#endif </span><span class="comment">/* WCSLIB_WCSTRIG */</span><span class="preprocessor"></span></div>
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