1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>buffer (with strategies)</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_4.html" title="buffer"> 10<link rel="next" href="return_buffer.html" title="return_buffer"> 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_4.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="return_buffer.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_7_with_strategies"></a><a class="link" href="buffer_7_with_strategies.html" title="buffer (with strategies)">buffer 28 (with strategies)</a> 29</h5></div></div></div> 30<p> 31 <a class="indexterm" name="idm45635706289920"></a> 32Calculates the buffer of a geometry. 33 </p> 34<h6> 35<a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.h0"></a> 36 <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.description"></a></span><a class="link" href="buffer_7_with_strategies.html#geometry.reference.algorithms.buffer.buffer_7_with_strategies.description">Description</a> 37 </h6> 38<p> 39 The free function buffer calculates the buffer (a polygon being the spatial 40 point set collection within a specified maximum distance from a geometry) 41 of a geometry. 42 </p> 43<h6> 44<a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.h1"></a> 45 <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.synopsis"></a></span><a class="link" href="buffer_7_with_strategies.html#geometry.reference.algorithms.buffer.buffer_7_with_strategies.synopsis">Synopsis</a> 46 </h6> 47<p> 48</p> 49<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">GeometryIn</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">MultiPolygon</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">DistanceStrategy</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">SideStrategy</span><span class="special">,</span> 50 <span class="keyword">typename</span> <span class="identifier">JoinStrategy</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">EndStrategy</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">PointStrategy</span><span class="special">></span> 51<span class="keyword">void</span> <span class="identifier">buffer</span><span class="special">(</span><span class="identifier">GeometryIn</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">geometry_in</span><span class="special">,</span> <span class="identifier">MultiPolygon</span> <span class="special">&</span> <span class="identifier">geometry_out</span><span class="special">,</span> <span class="identifier">DistanceStrategy</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">distance_strategy</span><span class="special">,</span> 52 <span class="identifier">SideStrategy</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">side_strategy</span><span class="special">,</span> <span class="identifier">JoinStrategy</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">join_strategy</span><span class="special">,</span> <span class="identifier">EndStrategy</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">end_strategy</span><span class="special">,</span> 53 <span class="identifier">PointStrategy</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">point_strategy</span><span class="special">)</span></pre> 54<p> 55 </p> 56<h6> 57<a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.h2"></a> 58 <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.parameters"></a></span><a class="link" href="buffer_7_with_strategies.html#geometry.reference.algorithms.buffer.buffer_7_with_strategies.parameters">Parameters</a> 59 </h6> 60<div class="informaltable"><table class="table"> 61<colgroup> 62<col> 63<col> 64<col> 65<col> 66</colgroup> 67<thead><tr> 68<th> 69 <p> 70 Type 71 </p> 72 </th> 73<th> 74 <p> 75 Concept 76 </p> 77 </th> 78<th> 79 <p> 80 Name 81 </p> 82 </th> 83<th> 84 <p> 85 Description 86 </p> 87 </th> 88</tr></thead> 89<tbody> 90<tr> 91<td> 92 <p> 93 GeometryIn const & 94 </p> 95 </td> 96<td> 97 <p> 98 Any type fulfilling a Geometry Concept 99 </p> 100 </td> 101<td> 102 <p> 103 geometry_in 104 </p> 105 </td> 106<td> 107 <p> 108 A model of the specified concept 109 </p> 110 </td> 111</tr> 112<tr> 113<td> 114 <p> 115 MultiPolygon & 116 </p> 117 </td> 118<td> 119 <p> 120 A type fulfilling the MultiPolygon Concept 121 </p> 122 </td> 123<td> 124 <p> 125 geometry_out 126 </p> 127 </td> 128<td> 129 <p> 130 output multi polygon (or std:: collection of polygons), will 131 contain a buffered version of the input geometry 132 </p> 133 </td> 134</tr> 135<tr> 136<td> 137 <p> 138 DistanceStrategy const & 139 </p> 140 </td> 141<td> 142 <p> 143 A strategy defining distance (or radius) 144 </p> 145 </td> 146<td> 147 <p> 148 distance_strategy 149 </p> 150 </td> 151<td> 152 <p> 153 The distance strategy to be used 154 </p> 155 </td> 156</tr> 157<tr> 158<td> 159 <p> 160 SideStrategy const & 161 </p> 162 </td> 163<td> 164 <p> 165 A strategy defining creation along sides 166 </p> 167 </td> 168<td> 169 <p> 170 side_strategy 171 </p> 172 </td> 173<td> 174 <p> 175 The side strategy to be used 176 </p> 177 </td> 178</tr> 179<tr> 180<td> 181 <p> 182 JoinStrategy const & 183 </p> 184 </td> 185<td> 186 <p> 187 A strategy defining creation around convex corners 188 </p> 189 </td> 190<td> 191 <p> 192 join_strategy 193 </p> 194 </td> 195<td> 196 <p> 197 The join strategy to be used 198 </p> 199 </td> 200</tr> 201<tr> 202<td> 203 <p> 204 EndStrategy const & 205 </p> 206 </td> 207<td> 208 <p> 209 A strategy defining creation at linestring ends 210 </p> 211 </td> 212<td> 213 <p> 214 end_strategy 215 </p> 216 </td> 217<td> 218 <p> 219 The end strategy to be used 220 </p> 221 </td> 222</tr> 223<tr> 224<td> 225 <p> 226 PointStrategy const & 227 </p> 228 </td> 229<td> 230 <p> 231 A strategy defining creation around points 232 </p> 233 </td> 234<td> 235 <p> 236 point_strategy 237 </p> 238 </td> 239<td> 240 <p> 241 The point strategy to be used 242 </p> 243 </td> 244</tr> 245</tbody> 246</table></div> 247<h6> 248<a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.h3"></a> 249 <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.header"></a></span><a class="link" href="buffer_7_with_strategies.html#geometry.reference.algorithms.buffer.buffer_7_with_strategies.header">Header</a> 250 </h6> 251<p> 252 Either 253 </p> 254<p> 255 <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> 256 </p> 257<p> 258 Or 259 </p> 260<p> 261 <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> 262 </p> 263<h6> 264<a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.h4"></a> 265 <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.strategies"></a></span><a class="link" href="buffer_7_with_strategies.html#geometry.reference.algorithms.buffer.buffer_7_with_strategies.strategies">Strategies</a> 266 </h6> 267<p> 268 The 5 strategies give the user control to the generated buffer 269 </p> 270<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 271<li class="listitem"> 272 convex corners can be rounded or sharp 273 </li> 274<li class="listitem"> 275 line-ends can be rounded or flat 276 </li> 277<li class="listitem"> 278 distance can be symmetric or assymetric, and positive or negative 279 </li> 280<li class="listitem"> 281 around points the shape can be circular or square 282 </li> 283<li class="listitem"> 284 the sides can be controlled (currently there is only one option provided) 285 </li> 286</ul></div> 287<p> 288 By specifying a negative distance for the distance_strategy, for the 289 (multi) polygon case, the polygon will be smaller (also known as deflate). 290 The distance cannot be 0. 291 </p> 292<p> 293 The next figure shows where in the generated buffer the strategies have 294 effect 295 </p> 296<p> 297 <span class="inlinemediaobject"><img src="../../../../img/algorithms/buffer_strategies.png" alt="buffer_strategies"></span> 298 </p> 299<h6> 300<a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.h5"></a> 301 <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.conformance"></a></span><a class="link" href="buffer_7_with_strategies.html#geometry.reference.algorithms.buffer.buffer_7_with_strategies.conformance">Conformance</a> 302 </h6> 303<p> 304 The function buffer implements function Buffer from the <a href="http://www.opengeospatial.org/standards/sfa" target="_top">OGC 305 Simple Feature Specification</a>. 306 </p> 307<p> 308 It is conformant if used with the following combination of strategies: 309 <a class="link" href="../../strategies/strategy_buffer_join_round.html" title="strategy::buffer::join_round">join_round</a>, 310 <a class="link" href="../../strategies/strategy_buffer_end_round.html" title="strategy::buffer::end_round">end_round</a>, 311 <a class="link" href="../../strategies/strategy_buffer_distance_symmetric.html" title="strategy::buffer::distance_symmetric">distance_symmetric</a>, 312 <a class="link" href="../../strategies/strategy_buffer_point_circle.html" title="strategy::buffer::point_circle">point_circle</a>, 313 side_straight 314 </p> 315<h6> 316<a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.h6"></a> 317 <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.supported_geometries"></a></span><a class="link" href="buffer_7_with_strategies.html#geometry.reference.algorithms.buffer.buffer_7_with_strategies.supported_geometries">Supported 318 geometries</a> 319 </h6> 320<div class="informaltable"><table class="table"> 321<colgroup> 322<col> 323<col> 324<col> 325</colgroup> 326<thead><tr> 327<th> 328 </th> 329<th> 330 <p> 331 2D Cartesian 332 </p> 333 </th> 334<th> 335 <p> 336 Geographic 337 </p> 338 </th> 339</tr></thead> 340<tbody> 341<tr> 342<td> 343 <p> 344 Point 345 </p> 346 </td> 347<td> 348 <p> 349 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span> 350 </p> 351 </td> 352<td> 353 <p> 354 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span> 355 </p> 356 </td> 357</tr> 358<tr> 359<td> 360 <p> 361 Segment 362 </p> 363 </td> 364<td> 365 <p> 366 <span class="inlinemediaobject"><img src="../../../../img/nyi.png" alt="nyi"></span> 367 </p> 368 </td> 369<td> 370 <p> 371 <span class="inlinemediaobject"><img src="../../../../img/nyi.png" alt="nyi"></span> 372 </p> 373 </td> 374</tr> 375<tr> 376<td> 377 <p> 378 Box 379 </p> 380 </td> 381<td> 382 <p> 383 <span class="inlinemediaobject"><img src="../../../../img/nyi.png" alt="nyi"></span> 384 </p> 385 </td> 386<td> 387 <p> 388 <span class="inlinemediaobject"><img src="../../../../img/nyi.png" alt="nyi"></span> 389 </p> 390 </td> 391</tr> 392<tr> 393<td> 394 <p> 395 Linestring 396 </p> 397 </td> 398<td> 399 <p> 400 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span> 401 </p> 402 </td> 403<td> 404 <p> 405 <span class="inlinemediaobject"><img src="../../../../img/nyi.png" alt="nyi"></span> 406 </p> 407 </td> 408</tr> 409<tr> 410<td> 411 <p> 412 Ring 413 </p> 414 </td> 415<td> 416 <p> 417 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span> 418 </p> 419 </td> 420<td> 421 <p> 422 <span class="inlinemediaobject"><img src="../../../../img/nyi.png" alt="nyi"></span> 423 </p> 424 </td> 425</tr> 426<tr> 427<td> 428 <p> 429 Polygon 430 </p> 431 </td> 432<td> 433 <p> 434 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span> 435 </p> 436 </td> 437<td> 438 <p> 439 <span class="inlinemediaobject"><img src="../../../../img/nyi.png" alt="nyi"></span> 440 </p> 441 </td> 442</tr> 443<tr> 444<td> 445 <p> 446 MultiPoint 447 </p> 448 </td> 449<td> 450 <p> 451 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span> 452 </p> 453 </td> 454<td> 455 <p> 456 <span class="inlinemediaobject"><img src="../../../../img/nyi.png" alt="nyi"></span> 457 </p> 458 </td> 459</tr> 460<tr> 461<td> 462 <p> 463 MultiLinestring 464 </p> 465 </td> 466<td> 467 <p> 468 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span> 469 </p> 470 </td> 471<td> 472 <p> 473 <span class="inlinemediaobject"><img src="../../../../img/nyi.png" alt="nyi"></span> 474 </p> 475 </td> 476</tr> 477<tr> 478<td> 479 <p> 480 MultiPolygon 481 </p> 482 </td> 483<td> 484 <p> 485 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span> 486 </p> 487 </td> 488<td> 489 <p> 490 <span class="inlinemediaobject"><img src="../../../../img/nyi.png" alt="nyi"></span> 491 </p> 492 </td> 493</tr> 494</tbody> 495</table></div> 496<h6> 497<a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.h7"></a> 498 <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.examples"></a></span><a class="link" href="buffer_7_with_strategies.html#geometry.reference.algorithms.buffer.buffer_7_with_strategies.examples">Examples</a> 499 </h6> 500<p> 501 Shows how the buffer algorithm can be used to create a buffer of a linestring, 502 a multi point, a multi polygon 503 </p> 504<p> 505</p> 506<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> 507<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> 508<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> 509 510 511<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> 512<span class="special">{</span> 513 <span class="keyword">typedef</span> <span class="keyword">double</span> <span class="identifier">coordinate_type</span><span class="special">;</span> 514 <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="identifier">coordinate_type</span><span class="special">></span> <span class="identifier">point</span><span class="special">;</span> 515 <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> 516 517 <span class="comment">// Declare strategies</span> 518 <span class="keyword">const</span> <span class="keyword">double</span> <span class="identifier">buffer_distance</span> <span class="special">=</span> <span class="number">1.0</span><span class="special">;</span> 519 <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">points_per_circle</span> <span class="special">=</span> <span class="number">36</span><span class="special">;</span> 520 <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="identifier">coordinate_type</span><span class="special">></span> <span class="identifier">distance_strategy</span><span class="special">(</span><span class="identifier">buffer_distance</span><span class="special">);</span> 521 <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">points_per_circle</span><span class="special">);</span> 522 <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="identifier">points_per_circle</span><span class="special">);</span> 523 <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">circle_strategy</span><span class="special">(</span><span class="identifier">points_per_circle</span><span class="special">);</span> 524 <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> 525 526 <span class="comment">// Declare output</span> 527 <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> 528 529 <span class="comment">// Declare/fill a linestring</span> 530 <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">ls</span><span class="special">;</span> 531 <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">"LINESTRING(0 0,4 5,7 4,10 6)"</span><span class="special">,</span> <span class="identifier">ls</span><span class="special">);</span> 532 533 <span class="comment">// Create the buffer of a linestring</span> 534 <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">ls</span><span class="special">,</span> <span class="identifier">result</span><span class="special">,</span> 535 <span class="identifier">distance_strategy</span><span class="special">,</span> <span class="identifier">side_strategy</span><span class="special">,</span> 536 <span class="identifier">join_strategy</span><span class="special">,</span> <span class="identifier">end_strategy</span><span class="special">,</span> <span class="identifier">circle_strategy</span><span class="special">);</span> 537 538 539 <span class="comment">// Declare/fill a multi point</span> 540 <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_point</span><span class="special"><</span><span class="identifier">point</span><span class="special">></span> <span class="identifier">mp</span><span class="special">;</span> 541 <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">"MULTIPOINT((3 3),(4 4),(6 2))"</span><span class="special">,</span> <span class="identifier">mp</span><span class="special">);</span> 542 543 <span class="comment">// Create the buffer of a multi point</span> 544 <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> 545 <span class="identifier">distance_strategy</span><span class="special">,</span> <span class="identifier">side_strategy</span><span class="special">,</span> 546 <span class="identifier">join_strategy</span><span class="special">,</span> <span class="identifier">end_strategy</span><span class="special">,</span> <span class="identifier">circle_strategy</span><span class="special">);</span> 547 548 549 <span class="comment">// Declare/fill a multi_polygon</span> 550 <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">mpol</span><span class="special">;</span> 551 <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(((0 1,2 5,5 3,0 1)),((1 1,5 2,5 0,1 1)))"</span><span class="special">,</span> <span class="identifier">mpol</span><span class="special">);</span> 552 553 <span class="comment">// Create the buffer of a multi polygon</span> 554 <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">mpol</span><span class="special">,</span> <span class="identifier">result</span><span class="special">,</span> 555 <span class="identifier">distance_strategy</span><span class="special">,</span> <span class="identifier">side_strategy</span><span class="special">,</span> 556 <span class="identifier">join_strategy</span><span class="special">,</span> <span class="identifier">end_strategy</span><span class="special">,</span> <span class="identifier">circle_strategy</span><span class="special">);</span> 557 558 559 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 560<span class="special">}</span> 561</pre> 562<p> 563 </p> 564<h6> 565<a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.h8"></a> 566 <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.the_linestring_case"></a></span><a class="link" href="buffer_7_with_strategies.html#geometry.reference.algorithms.buffer.buffer_7_with_strategies.the_linestring_case">The 567 linestring case</a> 568 </h6> 569<p> 570 <span class="inlinemediaobject"><img src="../../../../img/algorithms/buffer_linestring.png" alt="buffer_linestring"></span> 571 </p> 572<h6> 573<a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.h9"></a> 574 <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.the_multi_point_case"></a></span><a class="link" href="buffer_7_with_strategies.html#geometry.reference.algorithms.buffer.buffer_7_with_strategies.the_multi_point_case">The 575 multi_point case</a> 576 </h6> 577<p> 578 <span class="inlinemediaobject"><img src="../../../../img/algorithms/buffer_multi_point.png" alt="buffer_multi_point"></span> 579 </p> 580<h6> 581<a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.h10"></a> 582 <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.the_multi_polygon_case"></a></span><a class="link" href="buffer_7_with_strategies.html#geometry.reference.algorithms.buffer.buffer_7_with_strategies.the_multi_polygon_case">The 583 multi_polygon case</a> 584 </h6> 585<p> 586 <span class="inlinemediaobject"><img src="../../../../img/algorithms/buffer_multi_polygon.png" alt="buffer_multi_polygon"></span> 587 </p> 588<h6> 589<a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.h11"></a> 590 <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_7_with_strategies.available_strategies"></a></span><a class="link" href="buffer_7_with_strategies.html#geometry.reference.algorithms.buffer.buffer_7_with_strategies.available_strategies">Available 591 Strategies</a> 592 </h6> 593<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 594<li class="listitem"> 595 JoinStrategy: <a class="link" href="../../strategies/strategy_buffer_join_round.html" title="strategy::buffer::join_round">join_round 596 (cartesian)</a> 597 </li> 598<li class="listitem"> 599 JoinStrategy: <a class="link" href="../../strategies/strategy_buffer_join_miter.html" title="strategy::buffer::join_miter">join_miter 600 (cartesian)</a> 601 </li> 602<li class="listitem"> 603 EndStrategy: <a class="link" href="../../strategies/strategy_buffer_end_round.html" title="strategy::buffer::end_round">end_round 604 (cartesian)</a> 605 </li> 606<li class="listitem"> 607 EndStrategy: <a class="link" href="../../strategies/strategy_buffer_end_flat.html" title="strategy::buffer::end_flat">end_flat 608 (cartesian)</a> 609 </li> 610<li class="listitem"> 611 DistanceStrategy: <a class="link" href="../../strategies/strategy_buffer_distance_symmetric.html" title="strategy::buffer::distance_symmetric">distance_symmetric</a> 612 </li> 613<li class="listitem"> 614 DistanceStrategy: <a class="link" href="../../strategies/strategy_buffer_distance_asymmetric.html" title="strategy::buffer::distance_asymmetric">distance_asymmetric</a> 615 </li> 616<li class="listitem"> 617 PointStrategy: <a class="link" href="../../strategies/strategy_buffer_point_circle.html" title="strategy::buffer::point_circle">point_circle 618 (cartesian)</a> 619 </li> 620<li class="listitem"> 621 PointStrategy: <a class="link" href="../../strategies/strategy_buffer_point_square.html" title="strategy::buffer::point_square">point_square 622 (cartesian)</a> 623 </li> 624<li class="listitem"> 625 PointStrategy: <a class="link" href="../../strategies/strategy_buffer_geographic_point_circle.html" title="strategy::buffer::geographic_point_circle">geographic_point_circle 626 (geographic)</a> 627 </li> 628<li class="listitem"> 629 SideStrategy: <a class="link" href="../../strategies/strategy_buffer_side_straight.html" title="strategy::buffer::side_straight">side_straight 630 (cartesian)</a> 631 </li> 632</ul></div> 633</div> 634<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 635<td align="left"></td> 636<td align="right"><div class="copyright-footer">Copyright © 2009-2019 Barend Gehrels, Bruno Lalande, Mateusz Loskot, Adam 637 Wulkiewicz, Oracle and/or its affiliates<p> 638 Distributed under the Boost Software License, Version 1.0. (See accompanying 639 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>) 640 </p> 641</div></td> 642</tr></table> 643<hr> 644<div class="spirit-nav"> 645<a accesskey="p" href="buffer_4.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="return_buffer.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 646</div> 647</body> 648</html> 649
