1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>intersection (with strategy)</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="../intersection.html" title="intersection"> 9<link rel="prev" href="../intersection.html" title="intersection"> 10<link rel="next" href="intersection_3.html" title="intersection"> 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="../intersection.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../intersection.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="intersection_3.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.intersection.intersection_4_with_strategy"></a><a class="link" href="intersection_4_with_strategy.html" title="intersection (with strategy)">intersection 28 (with strategy)</a> 29</h5></div></div></div> 30<p> 31 <a class="indexterm" name="idm45635695927840"></a> 32Calculate the intersection of two geometries. 33 </p> 34<h6> 35<a name="geometry.reference.algorithms.intersection.intersection_4_with_strategy.h0"></a> 36 <span class="phrase"><a name="geometry.reference.algorithms.intersection.intersection_4_with_strategy.description"></a></span><a class="link" href="intersection_4_with_strategy.html#geometry.reference.algorithms.intersection.intersection_4_with_strategy.description">Description</a> 37 </h6> 38<p> 39 The free function intersection calculates the spatial set theoretic intersection 40 of two geometries. 41 </p> 42<h6> 43<a name="geometry.reference.algorithms.intersection.intersection_4_with_strategy.h1"></a> 44 <span class="phrase"><a name="geometry.reference.algorithms.intersection.intersection_4_with_strategy.synopsis"></a></span><a class="link" href="intersection_4_with_strategy.html#geometry.reference.algorithms.intersection.intersection_4_with_strategy.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">Geometry1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Geometry2</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">GeometryOut</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Strategy</span><span class="special">></span> 49<span class="keyword">bool</span> <span class="identifier">intersection</span><span class="special">(</span><span class="identifier">Geometry1</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">geometry1</span><span class="special">,</span> <span class="identifier">Geometry2</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">geometry2</span><span class="special">,</span> <span class="identifier">GeometryOut</span> <span class="special">&</span> <span class="identifier">geometry_out</span><span class="special">,</span> 50 <span class="identifier">Strategy</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">strategy</span><span class="special">)</span></pre> 51<p> 52 </p> 53<h6> 54<a name="geometry.reference.algorithms.intersection.intersection_4_with_strategy.h2"></a> 55 <span class="phrase"><a name="geometry.reference.algorithms.intersection.intersection_4_with_strategy.parameters"></a></span><a class="link" href="intersection_4_with_strategy.html#geometry.reference.algorithms.intersection.intersection_4_with_strategy.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 Geometry1 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 geometry1 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 Geometry2 const & 113 </p> 114 </td> 115<td> 116 <p> 117 Any type fulfilling a Geometry Concept 118 </p> 119 </td> 120<td> 121 <p> 122 geometry2 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 GeometryOut & 135 </p> 136 </td> 137<td> 138 <p> 139 Collection of geometries (e.g. std::vector, std::deque, boost::geometry::multi*) 140 of which the value_type fulfills a Point, LineString or Polygon 141 concept, or it is the output geometry (e.g. for a box) 142 </p> 143 </td> 144<td> 145 <p> 146 geometry_out 147 </p> 148 </td> 149<td> 150 <p> 151 The output geometry, either a multi_point, multi_polygon, multi_linestring, 152 or a box (for intersection of two boxes) 153 </p> 154 </td> 155</tr> 156<tr> 157<td> 158 <p> 159 Strategy const & 160 </p> 161 </td> 162<td> 163 <p> 164 Any type fulfilling a Intersection Strategy Concept 165 </p> 166 </td> 167<td> 168 <p> 169 strategy 170 </p> 171 </td> 172<td> 173 <p> 174 The strategy which will be used for intersection calculations 175 </p> 176 </td> 177</tr> 178</tbody> 179</table></div> 180<h6> 181<a name="geometry.reference.algorithms.intersection.intersection_4_with_strategy.h3"></a> 182 <span class="phrase"><a name="geometry.reference.algorithms.intersection.intersection_4_with_strategy.header"></a></span><a class="link" href="intersection_4_with_strategy.html#geometry.reference.algorithms.intersection.intersection_4_with_strategy.header">Header</a> 183 </h6> 184<p> 185 Either 186 </p> 187<p> 188 <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> 189 </p> 190<p> 191 Or 192 </p> 193<p> 194 <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">intersection</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code> 195 </p> 196<h6> 197<a name="geometry.reference.algorithms.intersection.intersection_4_with_strategy.h4"></a> 198 <span class="phrase"><a name="geometry.reference.algorithms.intersection.intersection_4_with_strategy.conformance"></a></span><a class="link" href="intersection_4_with_strategy.html#geometry.reference.algorithms.intersection.intersection_4_with_strategy.conformance">Conformance</a> 199 </h6> 200<p> 201 The function intersection implements function Intersection from the 202 <a href="http://www.opengeospatial.org/standards/sfa" target="_top">OGC Simple Feature 203 Specification</a>. 204 </p> 205<h6> 206<a name="geometry.reference.algorithms.intersection.intersection_4_with_strategy.h5"></a> 207 <span class="phrase"><a name="geometry.reference.algorithms.intersection.intersection_4_with_strategy.behavior"></a></span><a class="link" href="intersection_4_with_strategy.html#geometry.reference.algorithms.intersection.intersection_4_with_strategy.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> 227<tr> 228<td> 229 <p> 230 GeometryOut is a Point 231 </p> 232 </td> 233<td> 234 <p> 235 Calculates intersection points of input geometries 236 </p> 237 </td> 238</tr> 239<tr> 240<td> 241 <p> 242 GeometryOut is a Linestring 243 </p> 244 </td> 245<td> 246 <p> 247 Calculates intersection linestrings of input (multi)linestrings 248 </p> 249 </td> 250</tr> 251<tr> 252<td> 253 <p> 254 GeometryOut is a Polygon 255 </p> 256 </td> 257<td> 258 <p> 259 Calculates intersection polygons of input (multi)polygons and/or 260 boxes 261 </p> 262 </td> 263</tr> 264</tbody> 265</table></div> 266<div class="note"><table border="0" summary="Note"> 267<tr> 268<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../../doc/src/images/note.png"></td> 269<th align="left">Note</th> 270</tr> 271<tr><td align="left" valign="top"><p> 272 Check the <a class="link" href="../../concepts/concept_polygon.html" title="Polygon Concept">Polygon 273 Concept</a> for the rules that polygon input for this algorithm 274 should fulfill 275 </p></td></tr> 276</table></div> 277<h6> 278<a name="geometry.reference.algorithms.intersection.intersection_4_with_strategy.h6"></a> 279 <span class="phrase"><a name="geometry.reference.algorithms.intersection.intersection_4_with_strategy.example"></a></span><a class="link" href="intersection_4_with_strategy.html#geometry.reference.algorithms.intersection.intersection_4_with_strategy.example">Example</a> 280 </h6> 281<p> 282 Shows the intersection of two polygons 283 </p> 284<p> 285</p> 286<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span> 287<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">deque</span><span class="special">></span> 288 289<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> 290<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> 291<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">polygon</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 292 293<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">foreach</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 294 295 296<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> 297<span class="special">{</span> 298 <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">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="special">></span> <span class="identifier">polygon</span><span class="special">;</span> 299 300 <span class="identifier">polygon</span> <span class="identifier">green</span><span class="special">,</span> <span class="identifier">blue</span><span class="special">;</span> 301 302 <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> 303 <span class="string">"POLYGON((2 1.3,2.4 1.7,2.8 1.8,3.4 1.2,3.7 1.6,3.4 2,4.1 3,5.3 2.6,5.4 1.2,4.9 0.8,2.9 0.7,2 1.3)"</span> 304 <span class="string">"(4.0 2.0, 4.2 1.4, 4.8 1.9, 4.4 2.2, 4.0 2.0))"</span><span class="special">,</span> <span class="identifier">green</span><span class="special">);</span> 305 306 <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> 307 <span class="string">"POLYGON((4.0 -0.5 , 3.5 1.0 , 2.0 1.5 , 3.5 2.0 , 4.0 3.5 , 4.5 2.0 , 6.0 1.5 , 4.5 1.0 , 4.0 -0.5))"</span><span class="special">,</span> <span class="identifier">blue</span><span class="special">);</span> 308 309 <span class="identifier">std</span><span class="special">::</span><span class="identifier">deque</span><span class="special"><</span><span class="identifier">polygon</span><span class="special">></span> <span class="identifier">output</span><span class="special">;</span> 310 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">intersection</span><span class="special">(</span><span class="identifier">green</span><span class="special">,</span> <span class="identifier">blue</span><span class="special">,</span> <span class="identifier">output</span><span class="special">);</span> 311 312 <span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> 313 <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"green && blue:"</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> 314 <span class="identifier">BOOST_FOREACH</span><span class="special">(</span><span class="identifier">polygon</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">output</span><span class="special">)</span> 315 <span class="special">{</span> 316 <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">i</span><span class="special">++</span> <span class="special"><<</span> <span class="string">": "</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">area</span><span class="special">(</span><span class="identifier">p</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> 317 <span class="special">}</span> 318 319 320 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 321<span class="special">}</span> 322</pre> 323<p> 324 </p> 325<p> 326 Output: 327 </p> 328<pre class="programlisting">green && blue: 3290: 2.50205 330 331<img src="../../../../img/algorithms/intersection.png" alt="intersection"> 332 333</pre> 334<h6> 335<a name="geometry.reference.algorithms.intersection.intersection_4_with_strategy.h7"></a> 336 <span class="phrase"><a name="geometry.reference.algorithms.intersection.intersection_4_with_strategy.see_also"></a></span><a class="link" href="intersection_4_with_strategy.html#geometry.reference.algorithms.intersection.intersection_4_with_strategy.see_also">See 337 also</a> 338 </h6> 339<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 340<li class="listitem"> 341 <a class="link" href="../union_.html" title="union_">union</a> 342 </li> 343<li class="listitem"> 344 <a class="link" href="../difference.html" title="difference">difference</a> 345 </li> 346<li class="listitem"> 347 <a class="link" href="../sym_difference.html" title="sym_difference">sym_difference 348 (symmetric difference)</a> 349 </li> 350</ul></div> 351</div> 352<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 353<td align="left"></td> 354<td align="right"><div class="copyright-footer">Copyright © 2009-2019 Barend Gehrels, Bruno Lalande, Mateusz Loskot, Adam 355 Wulkiewicz, Oracle and/or its affiliates<p> 356 Distributed under the Boost Software License, Version 1.0. (See accompanying 357 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>) 358 </p> 359</div></td> 360</tr></table> 361<hr> 362<div class="spirit-nav"> 363<a accesskey="p" href="../intersection.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../intersection.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="intersection_3.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 364</div> 365</body> 366</html> 367
