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| <div class="titlepage"><div><div><h5 class="title"> |
| <a name="geometry.reference.adapted.boost_range.strided"></a><a class="link" href="strided.html" title="Boost.Range strided">Boost.Range |
| strided</a> |
| </h5></div></div></div> |
| <p> |
| Boost.Range strided range adaptor is adapted to Boost.Geometry |
| </p> |
| <a name="geometry.reference.adapted.boost_range.strided.description"></a><h6> |
| <a name="geometry.reference.adapted.boost_range.strided.description-heading"></a> |
| <a class="link" href="strided.html#geometry.reference.adapted.boost_range.strided.description">Description</a> |
| </h6> |
| <p> |
| Boost.Range strided range adaptor makes a strided range (usually begin |
| a linestring or ring) such that traversal is performed in steps of n. |
| </p> |
| <a name="geometry.reference.adapted.boost_range.strided.model_of"></a><h6> |
| <a name="geometry.reference.adapted.boost_range.strided.model_of-heading"></a> |
| <a class="link" href="strided.html#geometry.reference.adapted.boost_range.strided.model_of">Model |
| of</a> |
| </h6> |
| <p> |
| The Boost.Range strided range adaptor takes over the model of the original |
| geometry, which might be: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| a linestring |
| </li> |
| <li class="listitem"> |
| a ring |
| </li> |
| <li class="listitem"> |
| a multi_point |
| </li> |
| <li class="listitem"> |
| a multi_linestring |
| </li> |
| <li class="listitem"> |
| a multi_polygon |
| </li> |
| </ul></div> |
| <a name="geometry.reference.adapted.boost_range.strided.header"></a><h6> |
| <a name="geometry.reference.adapted.boost_range.strided.header-heading"></a> |
| <a class="link" href="strided.html#geometry.reference.adapted.boost_range.strided.header">Header</a> |
| </h6> |
| <p> |
| <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special"><</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">></span></code> |
| </p> |
| <p> |
| 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> |
| does not include this header. |
| </p> |
| <a name="geometry.reference.adapted.boost_range.strided.example"></a><h6> |
| <a name="geometry.reference.adapted.boost_range.strided.example-heading"></a> |
| <a class="link" href="strided.html#geometry.reference.adapted.boost_range.strided.example">Example</a> |
| </h6> |
| <p> |
| Shows how to use a Boost.Geometry ring, strided by Boost.Range adaptor |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span> |
| |
| <span class="preprocessor">#include</span> <span class="special"><</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">></span> |
| |
| <span class="preprocessor">#include</span> <span class="special"><</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">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</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">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</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">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</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">></span> |
| |
| |
| <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> |
| <span class="special">{</span> |
| <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> |
| <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> |
| |
| <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"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">xy</span><span class="special">;</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">ring</span><span class="special"><</span><span class="identifier">xy</span><span class="special">></span> <span class="identifier">ring</span><span class="special">;</span> |
| <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> |
| <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> |
| <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> |
| <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> |
| <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> |
| <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> |
| |
| <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> |
| |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> |
| <span class="special"><<</span> <span class="string">"Normal : "</span> <span class="special"><<</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"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span> |
| <span class="special"><<</span> <span class="string">"Strided: "</span> <span class="special"><<</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"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> |
| |
| <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> |
| <span class="special">}</span> |
| |
| </pre> |
| <p> |
| </p> |
| <p> |
| Output: |
| </p> |
| <pre class="programlisting">Normal : ((0, 0), (0, 1), (0, 2), (1, 2), (2, 2), (2, 0), (0, 0)) |
| Strided: ((0, 0), (0, 2), (2, 2), (0, 0)) |
| </pre> |
| </div> |
| <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> |
| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 2011 Barend Gehrels, Bruno Lalande, Mateusz Loskot<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 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>) |
| </p> |
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