libs/geometry/doc/html/geometry/reference/core/radian.html

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  26 <div class="titlepage"><div><div><h4 class="title">
  27 <a name="geometry.reference.core.radian"></a><a class="link" href="radian.html" title="radian">radian</a>
  28 </h4></div></div></div>
  29 <p>
  30           <a class="indexterm" name="idm46186986433424"></a>
  31 Unit of plane angle: Radians.
  32         </p>
  33 <h6>
  34 <a name="geometry.reference.core.radian.h0"></a>
  35           <span class="phrase"><a name="geometry.reference.core.radian.description"></a></span><a class="link" href="radian.html#geometry.reference.core.radian.description">Description</a>
  36         </h6>
  37 <p>
  38           Tag defining the unit of plane angle for spherical coordinate systems.
  39           This tag specifies that coordinates are defined in radians (-PI .. PI).
  40           It has to be specified for some coordinate systems.
  41         </p>
  42 <h6>
  43 <a name="geometry.reference.core.radian.h1"></a>
  44           <span class="phrase"><a name="geometry.reference.core.radian.synopsis"></a></span><a class="link" href="radian.html#geometry.reference.core.radian.synopsis">Synopsis</a>
  45         </h6>
  46 <p>
  47 </p>
  48 <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">radian</span>
  49 <span class="special">{</span>
  50   <span class="comment">// ...</span>
  51 <span class="special">};</span>
  52 </pre>
  53 <p>
  54         </p>
  55 <h6>
  56 <a name="geometry.reference.core.radian.h2"></a>
  57           <span class="phrase"><a name="geometry.reference.core.radian.header"></a></span><a class="link" href="radian.html#geometry.reference.core.radian.header">Header</a>
  58         </h6>
  59 <p>
  60           Either
  61         </p>
  62 <p>
  63           <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
  64         </p>
  65 <p>
  66           Or
  67         </p>
  68 <p>
  69           <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">core</span><span class="special">/</span><span class="identifier">cs</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
  70         </p>
  71 <h6>
  72 <a name="geometry.reference.core.radian.h3"></a>
  73           <span class="phrase"><a name="geometry.reference.core.radian.example"></a></span><a class="link" href="radian.html#geometry.reference.core.radian.example">example</a>
  74         </h6>
  75 <p>
  76           Specify two coordinate systems, one in degrees, one in radians.
  77         </p>
  78 <p>
  79 </p>
  80 <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>
  81 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  82
  83 <span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">;</span>
  84
  85 <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
  86 <span class="special">{</span>
  87     <span class="keyword">typedef</span> <span class="identifier">model</span><span class="special">::</span><span class="identifier">point</span><span class="special">&lt;</span><span class="keyword">double</span><span class="special">,</span> <span class="number">2</span><span class="special">,</span> <span class="identifier">cs</span><span class="special">::</span><span class="identifier">spherical_equatorial</span><span class="special">&lt;</span><span class="identifier">degree</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">degree_point</span><span class="special">;</span>
  88     <span class="keyword">typedef</span> <span class="identifier">model</span><span class="special">::</span><span class="identifier">point</span><span class="special">&lt;</span><span class="keyword">double</span><span class="special">,</span> <span class="number">2</span><span class="special">,</span> <span class="identifier">cs</span><span class="special">::</span><span class="identifier">spherical_equatorial</span><span class="special">&lt;</span><span class="identifier">radian</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">radian_point</span><span class="special">;</span>
  89
  90     <span class="identifier">degree_point</span> <span class="identifier">d</span><span class="special">(</span><span class="number">4.893</span><span class="special">,</span> <span class="number">52.373</span><span class="special">);</span>
  91     <span class="identifier">radian_point</span> <span class="identifier">r</span><span class="special">(</span><span class="number">0.041</span><span class="special">,</span> <span class="number">0.8527</span><span class="special">);</span>
  92
  93     <span class="keyword">double</span> <span class="identifier">dist</span> <span class="special">=</span> <span class="identifier">distance</span><span class="special">(</span><span class="identifier">d</span><span class="special">,</span> <span class="identifier">r</span><span class="special">);</span>
  94     <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span>
  95         <span class="special">&lt;&lt;</span> <span class="string">"distance:"</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span>
  96         <span class="special">&lt;&lt;</span> <span class="identifier">dist</span> <span class="special">&lt;&lt;</span> <span class="string">" over unit sphere"</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span>
  97         <span class="special">&lt;&lt;</span> <span class="identifier">dist</span> <span class="special">*</span> <span class="number">3959</span>  <span class="special">&lt;&lt;</span> <span class="string">" over a spherical earth, in miles"</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
  98
  99     <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
 100 <span class="special">}</span>
 101 </pre>
 102 <p>
 103         </p>
 104 <p>
 105           Output:
 106         </p>
 107 <pre class="programlisting">distance:
 108 0.0675272 over unit sphere
 109 267.34 over a spherical earth, in miles
 110 </pre>
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