libs/geometry/doc/html/geometry/reference/adapted/boost_range/strided.html

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  26 <div class="titlepage"><div><div><h5 class="title">
  27 <a name="geometry.reference.adapted.boost_range.strided"></a><a class="link" href="strided.html" title="Boost.Range strided">Boost.Range
  28           strided</a>
  29 </h5></div></div></div>
  30 <p>
  31             Boost.Range strided range adaptor is adapted to Boost.Geometry
  32           </p>
  33 <h6>
  34 <a name="geometry.reference.adapted.boost_range.strided.h0"></a>
  35             <span class="phrase"><a name="geometry.reference.adapted.boost_range.strided.description"></a></span><a class="link" href="strided.html#geometry.reference.adapted.boost_range.strided.description">Description</a>
  36           </h6>
  37 <p>
  38             Boost.Range strided range adaptor makes a strided range (usually begin
  39             a linestring or ring) such that traversal is performed in steps of n.
  40           </p>
  41 <h6>
  42 <a name="geometry.reference.adapted.boost_range.strided.h1"></a>
  43             <span class="phrase"><a name="geometry.reference.adapted.boost_range.strided.model_of"></a></span><a class="link" href="strided.html#geometry.reference.adapted.boost_range.strided.model_of">Model
  44             of</a>
  45           </h6>
  46 <p>
  47             The Boost.Range strided range adaptor takes over the model of the original
  48             geometry, which might be:
  49           </p>
  50 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  51 <li class="listitem">
  52                 a linestring
  53               </li>
  54 <li class="listitem">
  55                 a ring
  56               </li>
  57 <li class="listitem">
  58                 a multi_point
  59               </li>
  60 <li class="listitem">
  61                 a multi_linestring
  62               </li>
  63 <li class="listitem">
  64                 a multi_polygon
  65               </li>
  66 </ul></div>
  67 <h6>
  68 <a name="geometry.reference.adapted.boost_range.strided.h2"></a>
  69             <span class="phrase"><a name="geometry.reference.adapted.boost_range.strided.header"></a></span><a class="link" href="strided.html#geometry.reference.adapted.boost_range.strided.header">Header</a>
  70           </h6>
  71 <p>
  72             <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">geometries</span><span class="special">/</span><span class="identifier">adapted</span><span class="special">/</span><span class="identifier">boost_range</span><span class="special">/</span><span class="identifier">strided</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
  73           </p>
  74 <p>
  75             The standard header <code class="computeroutput"><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">.</span><span class="identifier">hpp</span></code>
  76             does not include this header.
  77           </p>
  78 <h6>
  79 <a name="geometry.reference.adapted.boost_range.strided.h3"></a>
  80             <span class="phrase"><a name="geometry.reference.adapted.boost_range.strided.example"></a></span><a class="link" href="strided.html#geometry.reference.adapted.boost_range.strided.example">Example</a>
  81           </h6>
  82 <p>
  83             Shows how to use a Boost.Geometry ring, strided by Boost.Range adaptor
  84           </p>
  85 <p>
  86 </p>
  87 <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>
  88
  89 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">assign</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  90
  91 <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>
  92 <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">geometries</span><span class="special">/</span><span class="identifier">point_xy</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  93 <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">geometries</span><span class="special">/</span><span class="identifier">ring</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  94 <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">geometries</span><span class="special">/</span><span class="identifier">adapted</span><span class="special">/</span><span class="identifier">boost_range</span><span class="special">/</span><span class="identifier">strided</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  95
  96
  97 <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
  98 <span class="special">{</span>
  99     <span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">assign</span><span class="special">;</span>
 100     <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">adaptors</span><span class="special">::</span><span class="identifier">strided</span><span class="special">;</span>
 101
 102     <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">model</span><span class="special">::</span><span class="identifier">d2</span><span class="special">::</span><span class="identifier">point_xy</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">xy</span><span class="special">;</span>
 103     <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">model</span><span class="special">::</span><span class="identifier">ring</span><span class="special">&lt;</span><span class="identifier">xy</span><span class="special">&gt;</span> <span class="identifier">ring</span><span class="special">;</span>
 104     <span class="identifier">ring</span> <span class="special">+=</span> <span class="identifier">xy</span><span class="special">(</span><span class="number">0</span><span class="special">,</span> <span class="number">0</span><span class="special">);</span>
 105     <span class="identifier">ring</span> <span class="special">+=</span> <span class="identifier">xy</span><span class="special">(</span><span class="number">0</span><span class="special">,</span> <span class="number">1</span><span class="special">);</span>
 106     <span class="identifier">ring</span> <span class="special">+=</span> <span class="identifier">xy</span><span class="special">(</span><span class="number">0</span><span class="special">,</span> <span class="number">2</span><span class="special">);</span>
 107     <span class="identifier">ring</span> <span class="special">+=</span> <span class="identifier">xy</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="number">2</span><span class="special">);</span>
 108     <span class="identifier">ring</span> <span class="special">+=</span> <span class="identifier">xy</span><span class="special">(</span><span class="number">2</span><span class="special">,</span> <span class="number">2</span><span class="special">);</span>
 109     <span class="identifier">ring</span> <span class="special">+=</span> <span class="identifier">xy</span><span class="special">(</span><span class="number">2</span><span class="special">,</span> <span class="number">0</span><span class="special">);</span>
 110
 111     <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">correct</span><span class="special">(</span><span class="identifier">ring</span><span class="special">);</span>
 112
 113     <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span>
 114         <span class="special">&lt;&lt;</span> <span class="string">"Normal : "</span> <span class="special">&lt;&lt;</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">dsv</span><span class="special">(</span><span class="identifier">ring</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span>
 115         <span class="special">&lt;&lt;</span> <span class="string">"Strided: "</span> <span class="special">&lt;&lt;</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">dsv</span><span class="special">(</span><span class="identifier">ring</span> <span class="special">|</span> <span class="identifier">strided</span><span class="special">(</span><span class="number">2</span><span class="special">))</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>
 116
 117     <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
 118 <span class="special">}</span>
 119 </pre>
 120 <p>
 121           </p>
 122 <p>
 123             Output:
 124           </p>
 125 <pre class="programlisting">Normal : ((0, 0), (0, 1), (0, 2), (1, 2), (2, 2), (2, 0), (0, 0))
 126 Strided: ((0, 0), (0, 2), (2, 2), (0, 0))
 127 </pre>
 128 </div>
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 131 <td align="right"><div class="copyright-footer">Copyright &#169; 2009-2014 Barend Gehrels, Bruno Lalande, Mateusz Loskot, Adam
 132       Wulkiewicz, Oracle and/or its affiliates<p>
 133         Distributed under the Boost Software License, Version 1.0. (See accompanying
 134         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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