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<a href="constants_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>&#160;<span class="comment">// constants.h -- various constant definitions</span></div><div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">// Written by Curtis Olson, started February 2000.</span></div><div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment">// Copyright (C) 2000  Curtis L. Olson - http://www.flightgear.org/~curt/</span></div><div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">// This library is free software; you can redistribute it and/or</span></div><div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">// modify it under the terms of the GNU Library General Public</span></div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment">// License as published by the Free Software Foundation; either</span></div><div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment">// version 2 of the License, or (at your option) any later version.</span></div><div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment">// This library is distributed in the hope that it will be useful,</span></div><div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU</span></div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment">// Library General Public License for more details.</span></div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="comment">// You should have received a copy of the GNU General Public License</span></div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="comment">// along with this program; if not, write to the Free Software</span></div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="comment">// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.</span></div><div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="comment">// $Id$</span></div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;</div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="preprocessor">#ifndef _SG_CONSTANTS_H</span></div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="preprocessor">#define _SG_CONSTANTS_H</span></div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;</div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;</div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="compiler_8h.html">compiler.h</a>&quot;</span></div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;</div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="preprocessor">#include &lt;cmath&gt;</span></div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;</div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;</div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="comment">// Make sure PI is defined in its various forms</span></div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;</div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="preprocessor">#ifndef SGD_PI // remove me once FlightGear no longer uses PLIB</span></div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;</div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="preprocessor">#ifdef M_PI</span></div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="keyword">const</span> <span class="keywordtype">double</span> SGD_PI = M_PI;</div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="keyword">const</span> <span class="keywordtype">float</span> SG_PI = M_PI;</div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="preprocessor">#else</span></div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="keyword">const</span> <span class="keywordtype">float</span> SG_PI = 3.1415926535f;</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="keyword">const</span> <span class="keywordtype">double</span> SGD_PI = 3.1415926535;</div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;</div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="preprocessor">#endif // of PLIB-SG guard</span></div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;</div><div class="line"><a name="l00052"></a><span class="lineno"><a class="line" href="constants_8h.html#a357490bcedff1c8c24c7060402869f2d">   52</a></span>&#160;<span class="keyword">const</span> <span class="keywordtype">double</span> <a class="code" href="constants_8h.html#a357490bcedff1c8c24c7060402869f2d">SGD_2PI</a> = SGD_PI * 2.0;</div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="preprocessor">#ifdef M_PI_2</span></div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="preprocessor">#  define  SGD_PI_2  M_PI_2</span></div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="preprocessor">#else</span></div><div class="line"><a name="l00058"></a><span class="lineno"><a class="line" href="constants_8h.html#a5059c67c5552c51b2d10e2b599a36246">   58</a></span>&#160;<span class="preprocessor">#  define  SGD_PI_2  1.57079632679489661923</span></div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;</div><div class="line"><a name="l00062"></a><span class="lineno"><a class="line" href="constants_8h.html#a14121bfdfdd203cadac3968e7bf73f0c">   62</a></span>&#160;<span class="keyword">const</span> <span class="keywordtype">double</span> <a class="code" href="constants_8h.html#a14121bfdfdd203cadac3968e7bf73f0c">SGD_PI_4</a> = 0.78539816339744830961;</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="preprocessor">#ifndef SGD_DEGREES_TO_RADIANS // // remove me once FlightGear no longer uses PLIB</span></div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;</div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="keyword">const</span> <span class="keywordtype">double</span> SGD_DEGREES_TO_RADIANS = SGD_PI / 180.0;</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="keyword">const</span> <span class="keywordtype">double</span> SGD_RADIANS_TO_DEGREES = 180.0 / SGD_PI;</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="keyword">const</span> <span class="keywordtype">float</span> SG_DEGREES_TO_RADIANS = SG_PI / 180.0f;</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="keyword">const</span> <span class="keywordtype">float</span> SG_RADIANS_TO_DEGREES = 180.0f / SG_PI;</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;<span class="preprocessor">#endif // of PLIB-SG guard</span></div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;</div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;<span class="preprocessor">#ifdef M_E</span></div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="preprocessor">#  define SG_E     M_E</span></div><div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;<span class="preprocessor">#else</span></div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;<span class="preprocessor">#  define SG_E     2.7182818284590452354</span></div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;</div><div class="line"><a name="l00082"></a><span class="lineno"><a class="line" href="constants_8h.html#a29ab591e24827168414d5bac4be8ed83">   82</a></span>&#160;<span class="preprocessor">#define SG_ONE_SECOND 4.848136811E-6</span></div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;</div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;</div><div class="line"><a name="l00087"></a><span class="lineno"><a class="line" href="constants_8h.html#a3d3d47a74f870ef611e71331165236bc">   87</a></span>&#160;<span class="preprocessor">#define SG_EARTH_RAD 6378.155</span></div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;</div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;<span class="comment">// Maximum terrain elevation from sea level</span></div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;<span class="preprocessor">#define SG_MAX_ELEVATION_M 9000.0</span></div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="comment">// Earth parameters for WGS 84, taken from LaRCsim/ls_constants.h</span></div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;</div><div class="line"><a name="l00095"></a><span class="lineno"><a class="line" href="constants_8h.html#ade32eb36e8378e15e74758c8802f87fb">   95</a></span>&#160;<span class="preprocessor">#define SG_EQUATORIAL_RADIUS_FT  20925650.</span></div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;</div><div class="line"><a name="l00098"></a><span class="lineno"><a class="line" href="constants_8h.html#a259a957d60434ee267ef57a1f6987d12">   98</a></span>&#160;<span class="preprocessor">#define SG_EQUATORIAL_RADIUS_M   6378138.12</span></div><div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;</div><div class="line"><a name="l00101"></a><span class="lineno"><a class="line" href="constants_8h.html#a9bd937908cbdd0aa60fb4bc61d226922">  101</a></span>&#160;<span class="preprocessor">#define SG_EQ_RAD_SQUARE_FT 437882827922500.</span></div><div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;</div><div class="line"><a name="l00104"></a><span class="lineno"><a class="line" href="constants_8h.html#aad5c1a8b25f7a819cee3f0755e6d08bc">  104</a></span>&#160;<span class="preprocessor">#define SG_EQ_RAD_SQUARE_M   40680645877797.1344</span></div><div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;</div><div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;<span class="comment">// Conversions</span></div><div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;</div><div class="line"><a name="l00109"></a><span class="lineno"><a class="line" href="constants_8h.html#a7037b2d6963fde5feeecd6dd526a6726">  109</a></span>&#160;<span class="preprocessor">#define SG_ARCSEC_TO_RAD    4.84813681109535993589e-06 </span></div><div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;</div><div class="line"><a name="l00112"></a><span class="lineno"><a class="line" href="constants_8h.html#a2924803717c36fb72f9a789b5916f68c">  112</a></span>&#160;<span class="preprocessor">#define SG_RAD_TO_ARCSEC    206264.806247096355156</span></div><div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;</div><div class="line"><a name="l00115"></a><span class="lineno"><a class="line" href="constants_8h.html#a9f3d9be0f84edf830fbc4361317e2120">  115</a></span>&#160;<span class="preprocessor">#define SG_FEET_TO_METER    0.3048</span></div><div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;</div><div class="line"><a name="l00118"></a><span class="lineno"><a class="line" href="constants_8h.html#a2bfa4c722cfa1c22907d3e664142668e">  118</a></span>&#160;<span class="preprocessor">#define SG_METER_TO_FEET    3.28083989501312335958  </span></div><div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;</div><div class="line"><a name="l00121"></a><span class="lineno"><a class="line" href="constants_8h.html#a73b51faed46ecefade2f3bb734dbb82f">  121</a></span>&#160;<span class="preprocessor">#define SG_METER_TO_NM      0.0005399568034557235</span></div><div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;</div><div class="line"><a name="l00124"></a><span class="lineno"><a class="line" href="constants_8h.html#ad1febcac0ff0041db263b00a87e3902f">  124</a></span>&#160;<span class="preprocessor">#define SG_NM_TO_METER      1852.0000</span></div><div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;</div><div class="line"><a name="l00127"></a><span class="lineno"><a class="line" href="constants_8h.html#aa0bac041bbf566453fb51c7fb8d73480">  127</a></span>&#160;<span class="preprocessor">#define SG_METER_TO_SM      0.0006213699494949496</span></div><div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;</div><div class="line"><a name="l00130"></a><span class="lineno"><a class="line" href="constants_8h.html#a4aa807ac5e1833ffc0f1aa2a22522bda">  130</a></span>&#160;<span class="preprocessor">#define SG_SM_TO_METER      1609.3412196</span></div><div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;</div><div class="line"><a name="l00133"></a><span class="lineno"><a class="line" href="constants_8h.html#a3c928f410485d293e465c51a980280db">  133</a></span>&#160;<span class="preprocessor">#define SG_NM_TO_RAD        0.00029088820866572159</span></div><div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;</div><div class="line"><a name="l00136"></a><span class="lineno"><a class="line" href="constants_8h.html#a0aeaf83d210a3da85059723fdff1a3da">  136</a></span>&#160;<span class="preprocessor">#define SG_RAD_TO_NM        3437.7467707849392526</span></div><div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;</div><div class="line"><a name="l00139"></a><span class="lineno"><a class="line" href="constants_8h.html#aff91ea3ff5e980096a47beb455d51046">  139</a></span>&#160;<span class="preprocessor">#define SG_MPS_TO_KT        1.9438444924406046432</span></div><div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;</div><div class="line"><a name="l00142"></a><span class="lineno"><a class="line" href="constants_8h.html#a63925589e266ebe49e9112cfbe311e9c">  142</a></span>&#160;<span class="preprocessor">#define SG_KT_TO_MPS        0.5144444444444444444</span></div><div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;</div><div class="line"><a name="l00145"></a><span class="lineno"><a class="line" href="constants_8h.html#aab001d23b7a200cc830d6360c5248c03">  145</a></span>&#160;<span class="preprocessor">#define SG_FPS_TO_KT        0.5924838012958962841</span></div><div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;</div><div class="line"><a name="l00148"></a><span class="lineno"><a class="line" href="constants_8h.html#ac0b6f048d1e0e5f0568c225ffec1bbc6">  148</a></span>&#160;<span class="preprocessor">#define SG_KT_TO_FPS        1.6878098571011956874</span></div><div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;</div><div class="line"><a name="l00151"></a><span class="lineno"><a class="line" href="constants_8h.html#af47f1478f3bd07c7ec653021e352d552">  151</a></span>&#160;<span class="preprocessor">#define SG_MPS_TO_MPH       2.2369362920544020312</span></div><div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;</div><div class="line"><a name="l00154"></a><span class="lineno"><a class="line" href="constants_8h.html#ae1770739c368bc52ae02d23b640ccbad">  154</a></span>&#160;<span class="preprocessor">#define SG_MPH_TO_MPS       0.44704</span></div><div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;</div><div class="line"><a name="l00157"></a><span class="lineno"><a class="line" href="constants_8h.html#aa2f47a0c33942b0ed4447bfe1408b6bf">  157</a></span>&#160;<span class="preprocessor">#define SG_MPS_TO_KMH       3.6</span></div><div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;</div><div class="line"><a name="l00160"></a><span class="lineno"><a class="line" href="constants_8h.html#ad7af13067f966575eff9c73fd7056e9c">  160</a></span>&#160;<span class="preprocessor">#define SG_KMH_TO_MPS       0.2777777777777777778</span></div><div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;</div><div class="line"><a name="l00163"></a><span class="lineno"><a class="line" href="constants_8h.html#a33d823af71c5480fa4450241eb4d37f3">  163</a></span>&#160;<span class="preprocessor">#define SG_PA_TO_INHG       0.0002952998330101010</span></div><div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;</div><div class="line"><a name="l00166"></a><span class="lineno"><a class="line" href="constants_8h.html#a0b2e8b9fa94d9336916bce4055a18070">  166</a></span>&#160;<span class="preprocessor">#define SG_INHG_TO_PA       3386.388640341</span></div><div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;</div><div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;</div><div class="line"><a name="l00170"></a><span class="lineno"><a class="line" href="constants_8h.html#a9c58704896214fdf091171828dd259b6">  170</a></span>&#160;<span class="preprocessor">#define SG_EPSILON 0.0000001</span></div><div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;</div><div class="line"><a name="l00174"></a><span class="lineno"><a class="line" href="constants_8h.html#aef03bfe0b1915cddd57b89728d771fac">  174</a></span>&#160;<span class="preprocessor">#define SG_BINOBJ_VERSION 6</span></div><div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;</div><div class="line"><a name="l00177"></a><span class="lineno"><a class="line" href="constants_8h.html#a4434952651c7a5a8298660f46e9d68ac">  177</a></span>&#160;<span class="preprocessor">#define SG_SCENERY_FILE_FORMAT &quot;0.4&quot;</span></div><div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;</div><div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;</div><div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;<span class="preprocessor">#endif // _SG_CONSTANTS_H</span></div><div class="ttc" id="compiler_8h_html"><div class="ttname"><a href="compiler_8h.html">compiler.h</a></div></div>
<div class="ttc" id="constants_8h_html_a357490bcedff1c8c24c7060402869f2d"><div class="ttname"><a href="constants_8h.html#a357490bcedff1c8c24c7060402869f2d">SGD_2PI</a></div><div class="ttdeci">const double SGD_2PI</div><div class="ttdef"><b>Definition:</b> constants.h:52</div></div>
<div class="ttc" id="constants_8h_html_a14121bfdfdd203cadac3968e7bf73f0c"><div class="ttname"><a href="constants_8h.html#a14121bfdfdd203cadac3968e7bf73f0c">SGD_PI_4</a></div><div class="ttdeci">const double SGD_PI_4</div><div class="ttdef"><b>Definition:</b> constants.h:62</div></div>
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