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| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="geometry.reference.algorithms.num_points"></a><a class="link" href="num_points.html" title="num_points">num_points</a> |
| </h4></div></div></div> |
| <p> |
| <a class="indexterm" name="id885101"></a> |
| Calculates the number of points of a geometry. |
| </p> |
| <a name="geometry.reference.algorithms.num_points.description"></a><h6> |
| <a name="geometry.reference.algorithms.num_points.description-heading"></a> |
| <a class="link" href="num_points.html#geometry.reference.algorithms.num_points.description">Description</a> |
| </h6> |
| <p> |
| The free function num_points calculates the number of points of a geometry. |
| </p> |
| <a name="geometry.reference.algorithms.num_points.synopsis"></a><h6> |
| <a name="geometry.reference.algorithms.num_points.synopsis-heading"></a> |
| <a class="link" href="num_points.html#geometry.reference.algorithms.num_points.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_points</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> <span class="keyword">bool</span> <span class="identifier">add_for_open</span> <span class="special">=</span> <span class="keyword">false</span><span class="special">)</span></pre> |
| <p> |
| </p> |
| <a name="geometry.reference.algorithms.num_points.parameters"></a><h6> |
| <a name="geometry.reference.algorithms.num_points.parameters-heading"></a> |
| <a class="link" href="num_points.html#geometry.reference.algorithms.num_points.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> |
| <tr> |
| <td> |
| <p> |
| bool |
| </p> |
| </td> |
| <td> |
| </td> |
| <td> |
| <p> |
| add_for_open |
| </p> |
| </td> |
| <td> |
| <p> |
| add one for open geometries (i.e. polygon types which are not |
| closed) |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <a name="geometry.reference.algorithms.num_points.returns"></a><h6> |
| <a name="geometry.reference.algorithms.num_points.returns-heading"></a> |
| <a class="link" href="num_points.html#geometry.reference.algorithms.num_points.returns">Returns</a> |
| </h6> |
| <p> |
| The calculated number of points |
| </p> |
| <a name="geometry.reference.algorithms.num_points.header"></a><h6> |
| <a name="geometry.reference.algorithms.num_points.header-heading"></a> |
| <a class="link" href="num_points.html#geometry.reference.algorithms.num_points.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">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_points</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code> |
| </p> |
| <a name="geometry.reference.algorithms.num_points.behavior"></a><h6> |
| <a name="geometry.reference.algorithms.num_points.behavior-heading"></a> |
| <a class="link" href="num_points.html#geometry.reference.algorithms.num_points.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> |
| Point |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns 1 |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| Segment |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns 2 |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| Rectangle |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns 4 |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| Rangelike (linestring, ring) |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns boost::size(geometry) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| Other geometries |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns the sum of the number of points of its elements |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| Open geometries |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns the sum of the number of points of its elements, it adds |
| one for open (per ring) if specified |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| Closed geometries |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns the sum of the number of points of its elements |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <a name="geometry.reference.algorithms.num_points.complexity"></a><h6> |
| <a name="geometry.reference.algorithms.num_points.complexity-heading"></a> |
| <a class="link" href="num_points.html#geometry.reference.algorithms.num_points.complexity">Complexity</a> |
| </h6> |
| <p> |
| Constant or Linear |
| </p> |
| <a name="geometry.reference.algorithms.num_points.examples"></a><h6> |
| <a name="geometry.reference.algorithms.num_points.examples-heading"></a> |
| <a class="link" href="num_points.html#geometry.reference.algorithms.num_points.examples">Examples</a> |
| </h6> |
| <p> |
| Get the number of points 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">multi</span><span class="special">/</span><span class="identifier">multi</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">polygon</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">multi</span><span class="special">/</span><span class="identifier">geometries</span><span class="special">/</span><span class="identifier">multi_polygon</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">domains</span><span class="special">/</span><span class="identifier">gis</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">wkt</span><span class="special">/</span><span class="identifier">wkt</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="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 0,0 0),(1 1,1 9,9 1,1 1)),((10 10,10 7,7 10,10 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 points: "</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_points</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 points: 12 |
| </pre> |
| </div> |
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| <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>) |
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