1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>buffer</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="../buffer.html" title="buffer"> 9<link rel="prev" href="../buffer.html" title="buffer"> 10<link rel="next" href="buffer_7_with_strategies.html" title="buffer (with strategies)"> 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="../buffer.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../buffer.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="buffer_7_with_strategies.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h5 class="title"> 27<a name="geometry.reference.algorithms.buffer.buffer_4"></a><a class="link" href="buffer_4.html" title="buffer">buffer</a> 28</h5></div></div></div> 29<p> 30 <a class="indexterm" name="idm45635706375280"></a> 31Calculates the buffer of a geometry. 32 </p> 33<h6> 34<a name="geometry.reference.algorithms.buffer.buffer_4.h0"></a> 35 <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_4.description"></a></span><a class="link" href="buffer_4.html#geometry.reference.algorithms.buffer.buffer_4.description">Description</a> 36 </h6> 37<p> 38 The free function buffer calculates the buffer (a polygon being the spatial 39 point set collection within a specified maximum distance from a geometry) 40 of a geometry. 41 </p> 42<h6> 43<a name="geometry.reference.algorithms.buffer.buffer_4.h1"></a> 44 <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_4.synopsis"></a></span><a class="link" href="buffer_4.html#geometry.reference.algorithms.buffer.buffer_4.synopsis">Synopsis</a> 45 </h6> 46<p> 47</p> 48<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Input</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Output</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Distance</span><span class="special">></span> 49<span class="keyword">void</span> <span class="identifier">buffer</span><span class="special">(</span><span class="identifier">Input</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">geometry_in</span><span class="special">,</span> <span class="identifier">Output</span> <span class="special">&</span> <span class="identifier">geometry_out</span><span class="special">,</span> <span class="identifier">Distance</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">distance</span><span class="special">,</span> 50 <span class="identifier">Distance</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">chord_length</span> <span class="special">=</span> <span class="special">-</span><span class="number">1</span><span class="special">)</span></pre> 51<p> 52 </p> 53<h6> 54<a name="geometry.reference.algorithms.buffer.buffer_4.h2"></a> 55 <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_4.parameters"></a></span><a class="link" href="buffer_4.html#geometry.reference.algorithms.buffer.buffer_4.parameters">Parameters</a> 56 </h6> 57<div class="informaltable"><table class="table"> 58<colgroup> 59<col> 60<col> 61<col> 62<col> 63</colgroup> 64<thead><tr> 65<th> 66 <p> 67 Type 68 </p> 69 </th> 70<th> 71 <p> 72 Concept 73 </p> 74 </th> 75<th> 76 <p> 77 Name 78 </p> 79 </th> 80<th> 81 <p> 82 Description 83 </p> 84 </th> 85</tr></thead> 86<tbody> 87<tr> 88<td> 89 <p> 90 Input const & 91 </p> 92 </td> 93<td> 94 <p> 95 Any type fulfilling a Geometry Concept 96 </p> 97 </td> 98<td> 99 <p> 100 geometry_in 101 </p> 102 </td> 103<td> 104 <p> 105 A model of the specified concept 106 </p> 107 </td> 108</tr> 109<tr> 110<td> 111 <p> 112 Output & 113 </p> 114 </td> 115<td> 116 <p> 117 Any type fulfilling a Geometry Concept 118 </p> 119 </td> 120<td> 121 <p> 122 geometry_out 123 </p> 124 </td> 125<td> 126 <p> 127 A model of the specified concept 128 </p> 129 </td> 130</tr> 131<tr> 132<td> 133 <p> 134 Distance const & 135 </p> 136 </td> 137<td> 138 <p> 139 numerical type (int, double, ttmath, ...) 140 </p> 141 </td> 142<td> 143 <p> 144 distance 145 </p> 146 </td> 147<td> 148 <p> 149 The distance to be used for the buffer 150 </p> 151 </td> 152</tr> 153<tr> 154<td> 155 <p> 156 Distance const & 157 </p> 158 </td> 159<td> 160 <p> 161 numerical type (int, double, ttmath, ...) 162 </p> 163 </td> 164<td> 165 <p> 166 chord_length 167 </p> 168 </td> 169<td> 170 <p> 171 (optional) The length of the chord's in the generated arcs 172 around points or bends 173 </p> 174 </td> 175</tr> 176</tbody> 177</table></div> 178<h6> 179<a name="geometry.reference.algorithms.buffer.buffer_4.h3"></a> 180 <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_4.header"></a></span><a class="link" href="buffer_4.html#geometry.reference.algorithms.buffer.buffer_4.header">Header</a> 181 </h6> 182<p> 183 Either 184 </p> 185<p> 186 <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">hpp</span><span class="special">></span></code> 187 </p> 188<p> 189 Or 190 </p> 191<p> 192 <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">algorithms</span><span class="special">/</span><span class="identifier">buffer</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code> 193 </p> 194<div class="note"><table border="0" summary="Note"> 195<tr> 196<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../../doc/src/images/note.png"></td> 197<th align="left">Note</th> 198</tr> 199<tr><td align="left" valign="top"><p> 200 This version without strategies enlarges a box. To buffer any geometry, 201 use <a class="link" href="buffer_7_with_strategies.html" title="buffer (with strategies)">buffer 202 (with strategies)</a> 203 </p></td></tr> 204</table></div> 205<h6> 206<a name="geometry.reference.algorithms.buffer.buffer_4.h4"></a> 207 <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_4.behavior"></a></span><a class="link" href="buffer_4.html#geometry.reference.algorithms.buffer.buffer_4.behavior">Behavior</a> 208 </h6> 209<div class="informaltable"><table class="table"> 210<colgroup> 211<col> 212<col> 213</colgroup> 214<thead><tr> 215<th> 216 <p> 217 Case 218 </p> 219 </th> 220<th> 221 <p> 222 Behavior 223 </p> 224 </th> 225</tr></thead> 226<tbody><tr> 227<td> 228 <p> 229 Box/Box 230 </p> 231 </td> 232<td> 233 <p> 234 Returns a new rectangular box, enlarged with the specified 235 distance. It is allowed that "geometry_out" the same 236 object as "geometry_in" 237 </p> 238 </td> 239</tr></tbody> 240</table></div> 241</div> 242<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 243<td align="left"></td> 244<td align="right"><div class="copyright-footer">Copyright © 2009-2019 Barend Gehrels, Bruno Lalande, Mateusz Loskot, Adam 245 Wulkiewicz, Oracle and/or its affiliates<p> 246 Distributed under the Boost Software License, Version 1.0. (See accompanying 247 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>) 248 </p> 249</div></td> 250</tr></table> 251<hr> 252<div class="spirit-nav"> 253<a accesskey="p" href="../buffer.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../buffer.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="buffer_7_with_strategies.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 254</div> 255</body> 256</html> 257
