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26 <div class="titlepage"><div><div><h4 class="title">
27 <a name="geometry.reference.strategies.strategy_buffer_join_round"></a><a class="link" href="strategy_buffer_join_round.html" title="strategy::buffer::join_round">strategy::buffer::join_round</a>
28 </h4></div></div></div>
30 <a class="indexterm" name="idm46186975237808"></a><a class="indexterm" name="idm46186975237120"></a><a class="indexterm" name="idm46186975236432"></a>
31 Let the buffer create rounded corners.
34 <a name="geometry.reference.strategies.strategy_buffer_join_round.h0"></a>
35 <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_join_round.description"></a></span><a class="link" href="strategy_buffer_join_round.html#geometry.reference.strategies.strategy_buffer_join_round.description">Description</a>
38 This strategy can be used as JoinStrategy for the buffer algorithm. It
39 creates a rounded corners around each convex vertex. It can be applied
40 for (multi)linestrings and (multi)polygons. This strategy is only applicable
41 for Cartesian coordinate systems.
44 <a name="geometry.reference.strategies.strategy_buffer_join_round.h1"></a>
45 <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_join_round.synopsis"></a></span><a class="link" href="strategy_buffer_join_round.html#geometry.reference.strategies.strategy_buffer_join_round.synopsis">Synopsis</a>
49 <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">join_round</span>
50 <span class="special">{</span>
51 <span class="comment">// ...</span>
52 <span class="special">};</span>
57 <a name="geometry.reference.strategies.strategy_buffer_join_round.h2"></a>
58 <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_join_round.constructor_s_"></a></span><a class="link" href="strategy_buffer_join_round.html#geometry.reference.strategies.strategy_buffer_join_round.constructor_s_">Constructor(s)</a>
60 <div class="informaltable"><table class="table">
87 <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">join_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>
93 Constructs the strategy.
98 <span class="bold"><strong>std::size_t</strong></span>: <span class="emphasis"><em>points_per_circle</em></span>:
99 points which would be used for a full circle
105 <a name="geometry.reference.strategies.strategy_buffer_join_round.h3"></a>
106 <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_join_round.header"></a></span><a class="link" href="strategy_buffer_join_round.html#geometry.reference.strategies.strategy_buffer_join_round.header">Header</a>
109 <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_join_round</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code>
112 <a name="geometry.reference.strategies.strategy_buffer_join_round.h4"></a>
113 <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_join_round.example"></a></span><a class="link" href="strategy_buffer_join_round.html#geometry.reference.strategies.strategy_buffer_join_round.example">Example</a>
116 Shows how the join_round strategy can be used as a JoinStrategy to create
121 <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>
122 <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>
123 <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>
126 <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
127 <span class="special">{</span>
128 <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>
129 <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>
131 <span class="comment">// Declare the join_round strategy with 72 points for a full circle</span>
132 <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="number">72</span><span class="special">);</span>
134 <span class="comment">// Declare other strategies</span>
135 <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>
136 <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_flat</span> <span class="identifier">end_strategy</span><span class="special">;</span>
137 <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>
138 <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>
140 <span class="comment">// Declare/fill a multi polygon</span>
141 <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">mp</span><span class="special">;</span>
142 <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(((5 5,7 8,9 5,5 5)),((8 7,8 10,11 10,11 7,8 7)))"</span><span class="special">,</span> <span class="identifier">mp</span><span class="special">);</span>
144 <span class="comment">// Create the buffered geometry with rounded corners</span>
145 <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>
146 <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>
147 <span class="identifier">distance_strategy</span><span class="special">,</span> <span class="identifier">side_strategy</span><span class="special">,</span>
148 <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>
151 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
152 <span class="special">}</span>
157 <a name="geometry.reference.strategies.strategy_buffer_join_round.h5"></a>
158 <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_join_round.output"></a></span><a class="link" href="strategy_buffer_join_round.html#geometry.reference.strategies.strategy_buffer_join_round.output">Output</a>
161 <span class="inlinemediaobject"><img src="../../../img/strategies/buffer_join_round.png" alt="buffer_join_round"></span>
164 <a name="geometry.reference.strategies.strategy_buffer_join_round.h6"></a>
165 <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_join_round.see_also"></a></span><a class="link" href="strategy_buffer_join_round.html#geometry.reference.strategies.strategy_buffer_join_round.see_also">See
168 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
169 <li class="listitem">
170 <a class="link" href="../algorithms/buffer/buffer_7_with_strategies.html" title="buffer (with strategies)">buffer
171 (with strategies)</a>
173 <li class="listitem">
174 <a class="link" href="strategy_buffer_join_miter.html" title="strategy::buffer::join_miter">join_miter</a>
178 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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180 <td align="right"><div class="copyright-footer">Copyright © 2009-2019 Barend Gehrels, Bruno Lalande, Mateusz Loskot, Adam
181 Wulkiewicz, Oracle and/or its affiliates<p>
182 Distributed under the Boost Software License, Version 1.0. (See accompanying
183 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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