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  26 <div class="titlepage"><div><div><h4 class="title">
  27 <a name="geometry.reference.strategies.strategy_buffer_distance_asymmetric"></a><a class="link" href="strategy_buffer_distance_asymmetric.html" title="strategy::buffer::distance_asymmetric">strategy::buffer::distance_asymmetric</a>
  28 </h4></div></div></div>
  29 <p>
  30           <a class="indexterm" name="idm46186974369648"></a><a class="indexterm" name="idm46186974368960"></a><a class="indexterm" name="idm46186974368272"></a>
  31 Let the buffer for linestrings be asymmetric.
  32         </p>
  33 <h6>
  34 <a name="geometry.reference.strategies.strategy_buffer_distance_asymmetric.h0"></a>
  35           <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_distance_asymmetric.synopsis"></a></span><a class="link" href="strategy_buffer_distance_asymmetric.html#geometry.reference.strategies.strategy_buffer_distance_asymmetric.synopsis">Synopsis</a>
  36         </h6>
  37 <p>
  38 </p>
  39 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">NumericType</span><span class="special">&gt;</span>
  40 <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">distance_asymmetric</span>
  41 <span class="special">{</span>
  42   <span class="comment">// ...</span>
  43 <span class="special">};</span>
  44 </pre>
  45 <p>
  46         </p>
  47 <h6>
  48 <a name="geometry.reference.strategies.strategy_buffer_distance_asymmetric.h1"></a>
  49           <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_distance_asymmetric.template_parameter_s_"></a></span><a class="link" href="strategy_buffer_distance_asymmetric.html#geometry.reference.strategies.strategy_buffer_distance_asymmetric.template_parameter_s_">Template
  50           parameter(s)</a>
  51         </h6>
  52 <div class="informaltable"><table class="table">
  53 <colgroup>
  54 <col>
  55 <col>
  56 </colgroup>
  57 <thead><tr>
  58 <th>
  59                   <p>
  60                     Parameter
  61                   </p>
  62                 </th>
  63 <th>
  64                   <p>
  65                     Description
  66                   </p>
  67                 </th>
  68 </tr></thead>
  69 <tbody><tr>
  70 <td>
  71                   <p>
  72                     typename NumericType
  73                   </p>
  74                 </td>
  75 <td>
  76                   <p>
  77                     numerical type (int, double, ttmath, ...)
  78                   </p>
  79                 </td>
  80 </tr></tbody>
  81 </table></div>
  82 <h6>
  83 <a name="geometry.reference.strategies.strategy_buffer_distance_asymmetric.h2"></a>
  84           <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_distance_asymmetric.constructor_s_"></a></span><a class="link" href="strategy_buffer_distance_asymmetric.html#geometry.reference.strategies.strategy_buffer_distance_asymmetric.constructor_s_">Constructor(s)</a>
  85         </h6>
  86 <div class="informaltable"><table class="table">
  87 <colgroup>
  88 <col>
  89 <col>
  90 <col>
  91 </colgroup>
  92 <thead><tr>
  93 <th>
  94                   <p>
  95                     Function
  96                   </p>
  97                 </th>
  98 <th>
  99                   <p>
 100                     Description
 101                   </p>
 102                 </th>
 103 <th>
 104                   <p>
 105                     Parameters
 106                   </p>
 107                 </th>
 108 </tr></thead>
 109 <tbody><tr>
 110 <td>
 111                   <p>
 112 </p>
 113 <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">distance_asymmetric</span><span class="special">(</span><span class="identifier">NumericType</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="identifier">left</span><span class="special">,</span> <span class="identifier">NumericType</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="identifier">right</span><span class="special">)</span></pre>
 114 <p>
 115                   </p>
 116                 </td>
 117 <td>
 118                   <p>
 119                     Constructs the strategy, two distances must be specified.
 120                   </p>
 121                 </td>
 122 <td>
 123                   <p>
 124                     <span class="bold"><strong>NumericType const &amp;</strong></span>: <span class="emphasis"><em>left</em></span>:
 125                     The distance (or radius) of the buffer on the left side
 126                   </p>
 127                   <p>
 128                     <span class="bold"><strong>NumericType const &amp;</strong></span>: <span class="emphasis"><em>right</em></span>:
 129                     The distance on the right side
 130                   </p>
 131                 </td>
 132 </tr></tbody>
 133 </table></div>
 134 <h6>
 135 <a name="geometry.reference.strategies.strategy_buffer_distance_asymmetric.h3"></a>
 136           <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_distance_asymmetric.header"></a></span><a class="link" href="strategy_buffer_distance_asymmetric.html#geometry.reference.strategies.strategy_buffer_distance_asymmetric.header">Header</a>
 137         </h6>
 138 <p>
 139           <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</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">agnostic</span><span class="special">/</span><span class="identifier">buffer_distance_asymmetric</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
 140         </p>
 141 <h6>
 142 <a name="geometry.reference.strategies.strategy_buffer_distance_asymmetric.h4"></a>
 143           <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_distance_asymmetric.example"></a></span><a class="link" href="strategy_buffer_distance_asymmetric.html#geometry.reference.strategies.strategy_buffer_distance_asymmetric.example">Example</a>
 144         </h6>
 145 <p>
 146           Shows how the distance_asymmetric strategy can be used as a DistanceStrategy
 147           to create asymmetric buffers
 148         </p>
 149 <p>
 150 </p>
 151 <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</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">&gt;</span>
 152 <span class="preprocessor">#include</span> <span class="special">&lt;</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">&gt;</span>
 153 <span class="preprocessor">#include</span> <span class="special">&lt;</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">&gt;</span>
 154
 155
 156 <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
 157 <span class="special">{</span>
 158     <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">&lt;</span><span class="keyword">double</span><span class="special">&gt;</span> <span class="identifier">point</span><span class="special">;</span>
 159     <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">&lt;</span><span class="identifier">point</span><span class="special">&gt;</span> <span class="identifier">linestring</span><span class="special">;</span>
 160     <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">&lt;</span><span class="identifier">point</span><span class="special">&gt;</span> <span class="identifier">polygon</span><span class="special">;</span>
 161
 162     <span class="comment">// Declare the asymmetric distance strategy</span>
 163     <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_asymmetric</span><span class="special">&lt;</span><span class="keyword">double</span><span class="special">&gt;</span> <span class="identifier">distance_strategy</span><span class="special">(</span><span class="number">1.0</span><span class="special">,</span> <span class="number">0.5</span><span class="special">);</span>
 164
 165     <span class="comment">// Declare other strategies</span>
 166     <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>
 167     <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>
 168     <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>
 169     <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>
 170
 171     <span class="comment">// Declare/fill a multi linestring</span>
 172     <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">&lt;</span><span class="identifier">linestring</span><span class="special">&gt;</span> <span class="identifier">ml</span><span class="special">;</span>
 173     <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>
 174
 175     <span class="comment">// Create the buffered geometry with left/right a different distance</span>
 176     <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">&lt;</span><span class="identifier">polygon</span><span class="special">&gt;</span> <span class="identifier">result</span><span class="special">;</span>
 177     <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>
 178                 <span class="identifier">distance_strategy</span><span class="special">,</span> <span class="identifier">side_strategy</span><span class="special">,</span>
 179                 <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>
 180
 181
 182     <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
 183 <span class="special">}</span>
 184 </pre>
 185 <p>
 186         </p>
 187 <h6>
 188 <a name="geometry.reference.strategies.strategy_buffer_distance_asymmetric.h5"></a>
 189           <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_distance_asymmetric.output"></a></span><a class="link" href="strategy_buffer_distance_asymmetric.html#geometry.reference.strategies.strategy_buffer_distance_asymmetric.output">Output</a>
 190         </h6>
 191 <p>
 192           <span class="inlinemediaobject"><img src="../../../img/strategies/buffer_distance_asymmetric.png" alt="buffer_distance_asymmetric"></span>
 193         </p>
 194 <h6>
 195 <a name="geometry.reference.strategies.strategy_buffer_distance_asymmetric.h6"></a>
 196           <span class="phrase"><a name="geometry.reference.strategies.strategy_buffer_distance_asymmetric.see_also"></a></span><a class="link" href="strategy_buffer_distance_asymmetric.html#geometry.reference.strategies.strategy_buffer_distance_asymmetric.see_also">See
 197           also</a>
 198         </h6>
 199 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 200 <li class="listitem">
 201               <a class="link" href="../algorithms/buffer/buffer_7_with_strategies.html" title="buffer (with strategies)">buffer
 202               (with strategies)</a>
 203             </li>
 204 <li class="listitem">
 205               <a class="link" href="strategy_buffer_distance_symmetric.html" title="strategy::buffer::distance_symmetric">distance_symmetric</a>
 206             </li>
 207 </ul></div>
 208 </div>
 209 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 210 <td align="left"></td>
 211 <td align="right"><div class="copyright-footer">Copyright &#169; 2009-2019 Barend Gehrels, Bruno Lalande, Mateusz Loskot, Adam
 212       Wulkiewicz, Oracle and/or its affiliates<p>
 213         Distributed under the Boost Software License, Version 1.0. (See accompanying
 214         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>)
 215       </p>
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