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| <div class="section"> |
| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="geometry.reference.algorithms.intersection"></a><a class="link" href="intersection.html" title="intersection">intersection</a> |
| </h4></div></div></div> |
| <p> |
| <a class="indexterm" name="idp114310272"></a> |
| Calculate the intersection of two geometries. |
| </p> |
| <h6> |
| <a name="geometry.reference.algorithms.intersection.h0"></a> |
| <span class="phrase"><a name="geometry.reference.algorithms.intersection.description"></a></span><a class="link" href="intersection.html#geometry.reference.algorithms.intersection.description">Description</a> |
| </h6> |
| <p> |
| The free function intersection calculates the spatial set theoretic intersection |
| of two geometries. |
| </p> |
| <h6> |
| <a name="geometry.reference.algorithms.intersection.h1"></a> |
| <span class="phrase"><a name="geometry.reference.algorithms.intersection.synopsis"></a></span><a class="link" href="intersection.html#geometry.reference.algorithms.intersection.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">Geometry1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Geometry2</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">GeometryOut</span><span class="special">></span> |
| <span class="keyword">bool</span> <span class="identifier">intersection</span><span class="special">(</span><span class="identifier">Geometry1</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">geometry1</span><span class="special">,</span> <span class="identifier">Geometry2</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">geometry2</span><span class="special">,</span> <span class="identifier">GeometryOut</span> <span class="special">&</span> <span class="identifier">geometry_out</span><span class="special">)</span></pre> |
| <p> |
| </p> |
| <h6> |
| <a name="geometry.reference.algorithms.intersection.h2"></a> |
| <span class="phrase"><a name="geometry.reference.algorithms.intersection.parameters"></a></span><a class="link" href="intersection.html#geometry.reference.algorithms.intersection.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> |
| Geometry1 const & |
| </p> |
| </td> |
| <td> |
| <p> |
| Any type fulfilling a Geometry Concept |
| </p> |
| </td> |
| <td> |
| <p> |
| geometry1 |
| </p> |
| </td> |
| <td> |
| <p> |
| A model of the specified concept |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| Geometry2 const & |
| </p> |
| </td> |
| <td> |
| <p> |
| Any type fulfilling a Geometry Concept |
| </p> |
| </td> |
| <td> |
| <p> |
| geometry2 |
| </p> |
| </td> |
| <td> |
| <p> |
| A model of the specified concept |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| GeometryOut & |
| </p> |
| </td> |
| <td> |
| <p> |
| Collection of geometries (e.g. std::vector, std::deque, boost::geometry::multi*) |
| of which the value_type fulfills a Point, LineString or Polygon |
| concept, or it is the output geometry (e.g. for a box) |
| </p> |
| </td> |
| <td> |
| <p> |
| geometry_out |
| </p> |
| </td> |
| <td> |
| <p> |
| The output geometry, either a multi_point, multi_polygon, multi_linestring, |
| or a box (for intersection of two boxes) |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <h6> |
| <a name="geometry.reference.algorithms.intersection.h3"></a> |
| <span class="phrase"><a name="geometry.reference.algorithms.intersection.header"></a></span><a class="link" href="intersection.html#geometry.reference.algorithms.intersection.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">intersection</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code> |
| </p> |
| <h6> |
| <a name="geometry.reference.algorithms.intersection.h4"></a> |
| <span class="phrase"><a name="geometry.reference.algorithms.intersection.conformance"></a></span><a class="link" href="intersection.html#geometry.reference.algorithms.intersection.conformance">Conformance</a> |
| </h6> |
| <p> |
| The function intersection implements function Intersection from the <a href="http://www.opengeospatial.org/standards/sfa" target="_top">OGC Simple Feature Specification</a>. |
| </p> |
| <h6> |
| <a name="geometry.reference.algorithms.intersection.h5"></a> |
| <span class="phrase"><a name="geometry.reference.algorithms.intersection.behavior"></a></span><a class="link" href="intersection.html#geometry.reference.algorithms.intersection.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> |
| GeometryOut is a Point |
| </p> |
| </td> |
| <td> |
| <p> |
| Calculates intersection points of input geometries |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| GeometryOut is a Linestring |
| </p> |
| </td> |
| <td> |
| <p> |
| Calculates intersection linestrings of input (multi)linestrings |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| GeometryOut is a Polygon |
| </p> |
| </td> |
| <td> |
| <p> |
| Calculates intersection polygons of input (multi)polygons and/or |
| boxes |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <div class="note"><table border="0" summary="Note"> |
| <tr> |
| <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../doc/src/images/note.png"></td> |
| <th align="left">Note</th> |
| </tr> |
| <tr><td align="left" valign="top"><p> |
| Check the <a class="link" href="../concepts/concept_polygon.html" title="Polygon Concept">Polygon |
| Concept</a> for the rules that polygon input for this algorithm should |
| fulfill |
| </p></td></tr> |
| </table></div> |
| <h6> |
| <a name="geometry.reference.algorithms.intersection.h6"></a> |
| <span class="phrase"><a name="geometry.reference.algorithms.intersection.example"></a></span><a class="link" href="intersection.html#geometry.reference.algorithms.intersection.example">Example</a> |
| </h6> |
| <p> |
| Shows the intersection of two polygons |
| </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">deque</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">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">foreach</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">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">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="identifier">polygon</span><span class="special">;</span> |
| |
| <span class="identifier">polygon</span> <span class="identifier">green</span><span class="special">,</span> <span class="identifier">blue</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">"POLYGON((2 1.3,2.4 1.7,2.8 1.8,3.4 1.2,3.7 1.6,3.4 2,4.1 3,5.3 2.6,5.4 1.2,4.9 0.8,2.9 0.7,2 1.3)"</span> |
| <span class="string">"(4.0 2.0, 4.2 1.4, 4.8 1.9, 4.4 2.2, 4.0 2.0))"</span><span class="special">,</span> <span class="identifier">green</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">"POLYGON((4.0 -0.5 , 3.5 1.0 , 2.0 1.5 , 3.5 2.0 , 4.0 3.5 , 4.5 2.0 , 6.0 1.5 , 4.5 1.0 , 4.0 -0.5))"</span><span class="special">,</span> <span class="identifier">blue</span><span class="special">);</span> |
| |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">deque</span><span class="special"><</span><span class="identifier">polygon</span><span class="special">></span> <span class="identifier">output</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">intersection</span><span class="special">(</span><span class="identifier">green</span><span class="special">,</span> <span class="identifier">blue</span><span class="special">,</span> <span class="identifier">output</span><span class="special">);</span> |
| |
| <span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</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">"green && blue:"</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="identifier">BOOST_FOREACH</span><span class="special">(</span><span class="identifier">polygon</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">output</span><span class="special">)</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="identifier">i</span><span class="special">++</span> <span class="special"><<</span> <span class="string">": "</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">area</span><span class="special">(</span><span class="identifier">p</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="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">green && blue: |
| 0: 2.50205 |
| |
| <img src="../../../img/algorithms/intersection.png" alt="intersection"> |
| |
| </pre> |
| <h6> |
| <a name="geometry.reference.algorithms.intersection.h7"></a> |
| <span class="phrase"><a name="geometry.reference.algorithms.intersection.see_also"></a></span><a class="link" href="intersection.html#geometry.reference.algorithms.intersection.see_also">See also</a> |
| </h6> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem"> |
| <a class="link" href="union_.html" title="union_">union</a> |
| </li> |
| <li class="listitem"> |
| <a class="link" href="difference.html" title="difference">difference</a> |
| </li> |
| <li class="listitem"> |
| <a class="link" href="sym_difference.html" title="sym_difference">sym_difference |
| (symmetric difference)</a> |
| </li> |
| </ul></div> |
| </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 © 2009-2015 Barend Gehrels, Bruno Lalande, |
| Mateusz Loskot, Adam Wulkiewicz, Oracle and/or its affiliates<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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