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| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="geometry.reference.strategies.strategy_buffer_point_square"></a><a class="link" href="strategy_buffer_point_square.html" title="strategy::buffer::point_square">strategy::buffer::point_square</a> |
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| <p> |
| <a class="indexterm" name="idp132690896"></a><a class="indexterm" name="idp132691584"></a><a class="indexterm" name="idp132692272"></a> |
| Create a squared form buffer around a point. |
| </p> |
| <h6> |
| <a name="geometry.reference.strategies.strategy_buffer_point_square.h0"></a> |
| <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_point_square.description"></a></span><a class="link" href="strategy_buffer_point_square.html#geometry.reference.strategies.strategy_buffer_point_square.description">Description</a> |
| </h6> |
| <p> |
| This strategy can be used as PointStrategy for the buffer algorithm. It |
| creates a square from each point, where the point lies in the center. It |
| can be applied for points and multi_points, but also for a linestring (if |
| it is degenerate, so consisting of only one point) and for polygons (if |
| it is degenerate). This strategy is only applicable for Cartesian coordinate |
| systems. |
| </p> |
| <h6> |
| <a name="geometry.reference.strategies.strategy_buffer_point_square.h1"></a> |
| <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_point_square.synopsis"></a></span><a class="link" href="strategy_buffer_point_square.html#geometry.reference.strategies.strategy_buffer_point_square.synopsis">Synopsis</a> |
| </h6> |
| <p> |
| </p> |
| <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">strategy</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">::</span><span class="identifier">point_square</span> |
| <span class="special">{</span> |
| <span class="comment">// ...</span> |
| <span class="special">};</span> |
| </pre> |
| <p> |
| </p> |
| <h6> |
| <a name="geometry.reference.strategies.strategy_buffer_point_square.h2"></a> |
| <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_point_square.header"></a></span><a class="link" href="strategy_buffer_point_square.html#geometry.reference.strategies.strategy_buffer_point_square.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">strategies</span><span class="special">/</span><span class="identifier">cartesian</span><span class="special">/</span><span class="identifier">buffer_point_square</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code> |
| </p> |
| <h6> |
| <a name="geometry.reference.strategies.strategy_buffer_point_square.h3"></a> |
| <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_point_square.example"></a></span><a class="link" href="strategy_buffer_point_square.html#geometry.reference.strategies.strategy_buffer_point_square.example">Example</a> |
| </h6> |
| <p> |
| Shows how the point_square strategy can be used as a PointStrategy to create |
| square buffers where the original point lies in the center |
| </p> |
| <p> |
| </p> |
| <pre class="programlisting"><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">geometries</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">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="identifier">point</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">point</span><span class="special">></span> <span class="identifier">polygon</span><span class="special">;</span> |
| |
| <span class="comment">// Declare the point_square strategy</span> |
| <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">strategy</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">::</span><span class="identifier">point_square</span> <span class="identifier">point_strategy</span><span class="special">;</span> |
| |
| <span class="comment">// Declare other strategies</span> |
| <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">strategy</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">::</span><span class="identifier">distance_symmetric</span><span class="special"><</span><span class="keyword">double</span><span class="special">></span> <span class="identifier">distance_strategy</span><span class="special">(</span><span class="number">0.5</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">strategy</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">::</span><span class="identifier">join_round</span> <span class="identifier">join_strategy</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">strategy</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">::</span><span class="identifier">end_round</span> <span class="identifier">end_strategy</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">strategy</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">::</span><span class="identifier">side_straight</span> <span class="identifier">side_strategy</span><span class="special">;</span> |
| |
| <span class="comment">// Declare/fill of a multi point</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_point</span><span class="special"><</span><span class="identifier">point</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">"MULTIPOINT((3 3),(3 4),(4 4),(7 3))"</span><span class="special">,</span> <span class="identifier">mp</span><span class="special">);</span> |
| |
| <span class="comment">// Create the buffer of a multi point</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">polygon</span><span class="special">></span> <span class="identifier">result</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">buffer</span><span class="special">(</span><span class="identifier">mp</span><span class="special">,</span> <span class="identifier">result</span><span class="special">,</span> |
| <span class="identifier">distance_strategy</span><span class="special">,</span> <span class="identifier">side_strategy</span><span class="special">,</span> |
| <span class="identifier">join_strategy</span><span class="special">,</span> <span class="identifier">end_strategy</span><span class="special">,</span> <span class="identifier">point_strategy</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> |
| <h6> |
| <a name="geometry.reference.strategies.strategy_buffer_point_square.h4"></a> |
| <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_point_square.output"></a></span><a class="link" href="strategy_buffer_point_square.html#geometry.reference.strategies.strategy_buffer_point_square.output">Output</a> |
| </h6> |
| <p> |
| <span class="inlinemediaobject"><img src="../../../img/strategies/buffer_point_square.png" alt="buffer_point_square"></span> |
| </p> |
| <h6> |
| <a name="geometry.reference.strategies.strategy_buffer_point_square.h5"></a> |
| <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_point_square.see_also"></a></span><a class="link" href="strategy_buffer_point_square.html#geometry.reference.strategies.strategy_buffer_point_square.see_also">See |
| also</a> |
| </h6> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem"> |
| <a class="link" href="../algorithms/buffer/buffer_7_with_strategies.html" title="buffer (with strategies)">buffer |
| (with strategies)</a> |
| </li> |
| <li class="listitem"> |
| <a class="link" href="strategy_buffer_point_circle.html" title="strategy::buffer::point_circle">point_circle</a> |
| </li> |
| </ul></div> |
| </div> |
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| <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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