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<title>strategy::buffer::end_round</title>
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<div class="titlepage"><div><div><h4 class="title">
<a name="geometry.reference.strategies.strategy_buffer_end_round"></a><a class="link" href="strategy_buffer_end_round.html" title="strategy::buffer::end_round">strategy::buffer::end_round</a>
</h4></div></div></div>
<p>
<a class="indexterm" name="idp134196176"></a><a class="indexterm" name="idp134196864"></a><a class="indexterm" name="idp134197552"></a>
Let the buffer create rounded ends.
</p>
<h6>
<a name="geometry.reference.strategies.strategy_buffer_end_round.h0"></a>
<span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_end_round.description"></a></span><a class="link" href="strategy_buffer_end_round.html#geometry.reference.strategies.strategy_buffer_end_round.description">Description</a>
</h6>
<p>
This strategy can be used as EndStrategy for the buffer algorithm. It creates
a rounded end for each linestring-end. It can be applied for (multi)linestrings.
Also it is applicable for spikes in (multi)polygons. This strategy is only
applicable for Cartesian coordinate systems.
</p>
<h6>
<a name="geometry.reference.strategies.strategy_buffer_end_round.h1"></a>
<span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_end_round.synopsis"></a></span><a class="link" href="strategy_buffer_end_round.html#geometry.reference.strategies.strategy_buffer_end_round.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">end_round</span>
<span class="special">{</span>
<span class="comment">// ...</span>
<span class="special">};</span>
</pre>
<p>
</p>
<h6>
<a name="geometry.reference.strategies.strategy_buffer_end_round.h2"></a>
<span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_end_round.constructor_s_"></a></span><a class="link" href="strategy_buffer_end_round.html#geometry.reference.strategies.strategy_buffer_end_round.constructor_s_">Constructor(s)</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
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<thead><tr>
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<p>
Function
</p>
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<p>
Description
</p>
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<th>
<p>
Parameters
</p>
</th>
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<td>
<p>
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">end_round</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">points_per_circle</span> <span class="special">=</span> <span class="number">90</span><span class="special">)</span></pre>
<p>
</p>
</td>
<td>
<p>
Constructs the strategy.
</p>
</td>
<td>
<p>
<span class="bold"><strong>std::size_t</strong></span>: <span class="emphasis"><em>points_per_circle</em></span>:
points which would be used for a full circle
</p>
</td>
</tr></tbody>
</table></div>
<h6>
<a name="geometry.reference.strategies.strategy_buffer_end_round.h3"></a>
<span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_end_round.header"></a></span><a class="link" href="strategy_buffer_end_round.html#geometry.reference.strategies.strategy_buffer_end_round.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_end_round</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code>
</p>
<h6>
<a name="geometry.reference.strategies.strategy_buffer_end_round.h4"></a>
<span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_end_round.example"></a></span><a class="link" href="strategy_buffer_end_round.html#geometry.reference.strategies.strategy_buffer_end_round.example">Example</a>
</h6>
<p>
Shows how the end_round strategy can be used as a EndStrategy to create
rounded ends
</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">linestring</span><span class="special"><</span><span class="identifier">point</span><span class="special">></span> <span class="identifier">linestring</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 round-end strategy with 36 points for a full circle</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="number">36</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">1.0</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="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">point_circle</span> <span class="identifier">point_strategy</span><span class="special">;</span>
<span class="comment">// Declare/fill a multi linestring</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_linestring</span><span class="special"><</span><span class="identifier">linestring</span><span class="special">></span> <span class="identifier">ml</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">"MULTILINESTRING((3 5,5 10,7 5),(7 7,11 10,15 7,19 10))"</span><span class="special">,</span> <span class="identifier">ml</span><span class="special">);</span>
<span class="comment">// Create the buffered geometry with rounded ends</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">ml</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_end_round.h5"></a>
<span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_end_round.output"></a></span><a class="link" href="strategy_buffer_end_round.html#geometry.reference.strategies.strategy_buffer_end_round.output">Output</a>
</h6>
<p>
<span class="inlinemediaobject"><img src="../../../img/strategies/buffer_end_round.png" alt="buffer_end_round"></span>
</p>
<h6>
<a name="geometry.reference.strategies.strategy_buffer_end_round.h6"></a>
<span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_end_round.see_also"></a></span><a class="link" href="strategy_buffer_end_round.html#geometry.reference.strategies.strategy_buffer_end_round.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_end_flat.html" title="strategy::buffer::end_flat">end_flat</a>
</li>
</ul></div>
</div>
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<td align="right"><div class="copyright-footer">Copyright © 2009-2014 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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