1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>strategy::buffer::distance_asymmetric</title> 5<link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../index.html" title="Chapter 1. Geometry"> 8<link rel="up" href="../strategies.html" title="Strategies"> 9<link rel="prev" href="strategy_buffer_distance_symmetric.html" title="strategy::buffer::distance_symmetric"> 10<link rel="next" href="strategy_buffer_point_circle.html" title="strategy::buffer::point_circle"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="strategy_buffer_distance_symmetric.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../strategies.html"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="strategy_buffer_point_circle.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 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="idm45635670586192"></a><a class="indexterm" name="idm45635670585504"></a><a class="indexterm" name="idm45635670584816"></a> 31Let 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"><</span><span class="keyword">typename</span> <span class="identifier">NumericType</span><span class="special">></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">&</span> <span class="identifier">left</span><span class="special">,</span> <span class="identifier">NumericType</span> <span class="keyword">const</span> <span class="special">&</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 &</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 &</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"><</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">></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"><</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> 152<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> 153<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> 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"><</span><span class="keyword">double</span><span class="special">></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"><</span><span class="identifier">point</span><span class="special">></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"><</span><span class="identifier">point</span><span class="special">></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"><</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="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"><</span><span class="identifier">linestring</span><span class="special">></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"><</span><span class="identifier">polygon</span><span class="special">></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 © 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> 216</div></td> 217</tr></table> 218<hr> 219<div class="spirit-nav"> 220<a accesskey="p" href="strategy_buffer_distance_symmetric.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../strategies.html"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="strategy_buffer_point_circle.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 221</div> 222</body> 223</html> 224
