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| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="geometry.reference.algorithms.num_segments"></a><a class="link" href="num_segments.html" title="num_segments">num_segments</a> |
| </h4></div></div></div> |
| <p> |
| <a class="indexterm" name="idp116905648"></a> |
| Calculates the number of segments of a geometry. |
| </p> |
| <h6> |
| <a name="geometry.reference.algorithms.num_segments.h0"></a> |
| <span class="phrase"><a name="geometry.reference.algorithms.num_segments.description"></a></span><a class="link" href="num_segments.html#geometry.reference.algorithms.num_segments.description">Description</a> |
| </h6> |
| <p> |
| The free function num_segments calculates the number of segments of a geometry. |
| </p> |
| <h6> |
| <a name="geometry.reference.algorithms.num_segments.h1"></a> |
| <span class="phrase"><a name="geometry.reference.algorithms.num_segments.synopsis"></a></span><a class="link" href="num_segments.html#geometry.reference.algorithms.num_segments.synopsis">Synopsis</a> |
| </h6> |
| <p> |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Geometry</span><span class="special">></span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">num_segments</span><span class="special">(</span><span class="identifier">Geometry</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">geometry</span><span class="special">)</span></pre> |
| <p> |
| </p> |
| <h6> |
| <a name="geometry.reference.algorithms.num_segments.h2"></a> |
| <span class="phrase"><a name="geometry.reference.algorithms.num_segments.parameters"></a></span><a class="link" href="num_segments.html#geometry.reference.algorithms.num_segments.parameters">Parameters</a> |
| </h6> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Type |
| </p> |
| </th> |
| <th> |
| <p> |
| Concept |
| </p> |
| </th> |
| <th> |
| <p> |
| Name |
| </p> |
| </th> |
| <th> |
| <p> |
| Description |
| </p> |
| </th> |
| </tr></thead> |
| <tbody><tr> |
| <td> |
| <p> |
| Geometry const & |
| </p> |
| </td> |
| <td> |
| <p> |
| Any type fulfilling a Geometry Concept |
| </p> |
| </td> |
| <td> |
| <p> |
| geometry |
| </p> |
| </td> |
| <td> |
| <p> |
| A model of the specified concept |
| </p> |
| </td> |
| </tr></tbody> |
| </table></div> |
| <h6> |
| <a name="geometry.reference.algorithms.num_segments.h3"></a> |
| <span class="phrase"><a name="geometry.reference.algorithms.num_segments.returns"></a></span><a class="link" href="num_segments.html#geometry.reference.algorithms.num_segments.returns">Returns</a> |
| </h6> |
| <p> |
| The calculated number of segments |
| </p> |
| <h6> |
| <a name="geometry.reference.algorithms.num_segments.h4"></a> |
| <span class="phrase"><a name="geometry.reference.algorithms.num_segments.header"></a></span><a class="link" href="num_segments.html#geometry.reference.algorithms.num_segments.header">Header</a> |
| </h6> |
| <p> |
| Either |
| </p> |
| <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">hpp</span><span class="special">></span></code> |
| </p> |
| <p> |
| Or |
| </p> |
| <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">algorithms</span><span class="special">/</span><span class="identifier">num_segments</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code> |
| </p> |
| <h6> |
| <a name="geometry.reference.algorithms.num_segments.h5"></a> |
| <span class="phrase"><a name="geometry.reference.algorithms.num_segments.conformance"></a></span><a class="link" href="num_segments.html#geometry.reference.algorithms.num_segments.conformance">Conformance</a> |
| </h6> |
| <p> |
| The function num_segments is not defined by OGC. |
| </p> |
| <h6> |
| <a name="geometry.reference.algorithms.num_segments.h6"></a> |
| <span class="phrase"><a name="geometry.reference.algorithms.num_segments.behavior"></a></span><a class="link" href="num_segments.html#geometry.reference.algorithms.num_segments.behavior">Behavior</a> |
| </h6> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Case |
| </p> |
| </th> |
| <th> |
| <p> |
| Behavior |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| pointlike (e.g. point) |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns 0 |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| Segment |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns 1 |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| Box |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns d * 2^(d-1), where d is the dimension of the box |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| Rangelike (linestring, ring) |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns boost::size(geometry) - 1 |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| Other geometries |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns the sum of the number of segments of its elements |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <h6> |
| <a name="geometry.reference.algorithms.num_segments.h7"></a> |
| <span class="phrase"><a name="geometry.reference.algorithms.num_segments.complexity"></a></span><a class="link" href="num_segments.html#geometry.reference.algorithms.num_segments.complexity">Complexity</a> |
| </h6> |
| <p> |
| Constant or Linear |
| </p> |
| <h6> |
| <a name="geometry.reference.algorithms.num_segments.h8"></a> |
| <span class="phrase"><a name="geometry.reference.algorithms.num_segments.examples"></a></span><a class="link" href="num_segments.html#geometry.reference.algorithms.num_segments.examples">Examples</a> |
| </h6> |
| <p> |
| Get the number of segments in a geometry |
| </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">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="keyword">int</span> <span class="identifier">main</span><span class="special">()</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">multi_polygon</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">polygon</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">d2</span><span class="special">::</span><span class="identifier">point_xy</span><span class="special"><</span><span class="keyword">double</span><span class="special">>,</span> <span class="keyword">true</span><span class="special">,</span> <span class="keyword">false</span> <span class="comment">// cw, open polygon</span> |
| <span class="special">></span> |
| <span class="special">></span> <span class="identifier">mp</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">read_wkt</span><span class="special">(</span><span class="string">"MULTIPOLYGON(((0 0,0 10,10 0),(1 1,8 1,1 8)),((10 10,10 20,20 10)))"</span><span class="special">,</span> <span class="identifier">mp</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">"Number of segments: "</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">num_segments</span><span class="special">(</span><span class="identifier">mp</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">Number of segments: 9 |
| </pre> |
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| Distributed under the Boost Software License, Version 1.0. (See accompanying |
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