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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="idp119324304"></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 class="toc"><dl class="toc">
+<dt><span class="section"><a href="intersection/intersection_4_with_strategy.html">intersection
+ (with strategy)</a></span></dt>
+<dt><span class="section"><a href="intersection/intersection_3.html">intersection</a></span></dt>
+</dl></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>
+<td align="right"><div class="copyright-footer">Copyright © 2009-2017 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>)
</p>
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