1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>MultiPolygon Concept</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="../concepts.html" title="Concepts"> 9<link rel="prev" href="concept_multi_linestring.html" title="MultiLinestring Concept"> 10<link rel="next" href="concept_box.html" title="Box Concept"> 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="concept_multi_linestring.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../concepts.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="concept_box.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.concepts.concept_multi_polygon"></a><a class="link" href="concept_multi_polygon.html" title="MultiPolygon Concept">MultiPolygon 28 Concept</a> 29</h4></div></div></div> 30<h6> 31<a name="geometry.reference.concepts.concept_multi_polygon.h0"></a> 32 <span class="phrase"><a name="geometry.reference.concepts.concept_multi_polygon.description"></a></span><a class="link" href="concept_multi_polygon.html#geometry.reference.concepts.concept_multi_polygon.description">Description</a> 33 </h6> 34<p> 35 The MultiPolygon Concept describes the requirements for a multi polygon 36 type. All algorithms in Boost.Geometry will check any geometry arguments 37 against the concept requirements. 38 </p> 39<h6> 40<a name="geometry.reference.concepts.concept_multi_polygon.h1"></a> 41 <span class="phrase"><a name="geometry.reference.concepts.concept_multi_polygon.concept_definition"></a></span><a class="link" href="concept_multi_polygon.html#geometry.reference.concepts.concept_multi_polygon.concept_definition">Concept 42 Definition</a> 43 </h6> 44<p> 45 The MultiPolygon Concept is defined as following: 46 </p> 47<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 48<li class="listitem"> 49 There must be a specialization of the metafunction <code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">tag</span></code>, 50 defining <code class="computeroutput"><span class="identifier">multi_polygon_tag</span></code> 51 as type 52 </li> 53<li class="listitem"> 54 It must behave like a Boost.Range Random Access Range 55 </li> 56<li class="listitem"> 57 The type defined by the metafunction <code class="computeroutput"><span class="identifier">range_value</span><span class="special"><...>::</span><span class="identifier">type</span></code> 58 must fulfill the <a class="link" href="concept_polygon.html" title="Polygon Concept">Polygon 59 Concept</a> 60 </li> 61</ul></div> 62<h6> 63<a name="geometry.reference.concepts.concept_multi_polygon.h2"></a> 64 <span class="phrase"><a name="geometry.reference.concepts.concept_multi_polygon.rules"></a></span><a class="link" href="concept_multi_polygon.html#geometry.reference.concepts.concept_multi_polygon.rules">Rules</a> 65 </h6> 66<p> 67 Besides the Concepts, which are checks on compile-time, there are rules 68 that valid MultiPolygons must fulfill. See the <a class="link" href="concept_polygon.html" title="Polygon Concept">Polygon 69 Concept</a> for more information on the rules a polygon (and also a 70 multi polygon) must fulfill. 71 </p> 72<p> 73 Additionally: 74 </p> 75<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 76<li class="listitem"> 77 Individual polygons making up a multi-polygon may not intersect each 78 other, but tangencies are allowed. 79 </li> 80<li class="listitem"> 81 One polygon might be located within the interior ring of another polygon. 82 </li> 83</ul></div> 84<h6> 85<a name="geometry.reference.concepts.concept_multi_polygon.h3"></a> 86 <span class="phrase"><a name="geometry.reference.concepts.concept_multi_polygon.available_models"></a></span><a class="link" href="concept_multi_polygon.html#geometry.reference.concepts.concept_multi_polygon.available_models">Available 87 Models</a> 88 </h6> 89<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> 90 <a class="link" href="../models/model_multi_polygon.html" title="model::multi_polygon">model::multi_polygon</a> 91 </li></ul></div> 92</div> 93<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 94<td align="left"></td> 95<td align="right"><div class="copyright-footer">Copyright © 2009-2019 Barend Gehrels, Bruno Lalande, Mateusz Loskot, Adam 96 Wulkiewicz, Oracle and/or its affiliates<p> 97 Distributed under the Boost Software License, Version 1.0. (See accompanying 98 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>) 99 </p> 100</div></td> 101</tr></table> 102<hr> 103<div class="spirit-nav"> 104<a accesskey="p" href="concept_multi_linestring.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../concepts.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="concept_box.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 105</div> 106</body> 107</html> 108
