1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>discrete_hausdorff_distance</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="../discrete_hausdorff_distance.html" title="discrete_hausdorff_distance"> 9<link rel="prev" href="discrete_hausdorff_distance_3_with_strategy.html" title="discrete_hausdorff_distance (with strategy)"> 10<link rel="next" href="../disjoint.html" title="disjoint"> 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="discrete_hausdorff_distance_3_with_strategy.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../discrete_hausdorff_distance.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="../disjoint.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.discrete_hausdorff_distance.discrete_hausdorff_distance_2"></a><a class="link" href="discrete_hausdorff_distance_2.html" title="discrete_hausdorff_distance">discrete_hausdorff_distance</a> 28</h5></div></div></div> 29<p> 30 <a class="indexterm" name="idm45635700586800"></a> 31Calculate discrete Hausdorff distance between two geometries (currently 32 works for LineString-LineString, MultiPoint-MultiPoint, Point-MultiPoint, 33 MultiLineString-MultiLineString). 34 </p> 35<h6> 36<a name="geometry.reference.algorithms.discrete_hausdorff_distance.discrete_hausdorff_distance_2.h0"></a> 37 <span class="phrase"><a name="geometry.reference.algorithms.discrete_hausdorff_distance.discrete_hausdorff_distance_2.synopsis"></a></span><a class="link" href="discrete_hausdorff_distance_2.html#geometry.reference.algorithms.discrete_hausdorff_distance.discrete_hausdorff_distance_2.synopsis">Synopsis</a> 38 </h6> 39<p> 40</p> 41<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> 42<span class="identifier">distance_result</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">point_type</span><span class="special"><</span><span class="identifier">Geometry1</span><span class="special">>::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">point_type</span><span class="special"><</span><span class="identifier">Geometry2</span><span class="special">>::</span><span class="identifier">type</span> <span class="special">>::</span><span class="identifier">type</span> <span class="identifier">discrete_hausdorff_distance</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></pre> 43<p> 44 </p> 45<h6> 46<a name="geometry.reference.algorithms.discrete_hausdorff_distance.discrete_hausdorff_distance_2.h1"></a> 47 <span class="phrase"><a name="geometry.reference.algorithms.discrete_hausdorff_distance.discrete_hausdorff_distance_2.parameters"></a></span><a class="link" href="discrete_hausdorff_distance_2.html#geometry.reference.algorithms.discrete_hausdorff_distance.discrete_hausdorff_distance_2.parameters">Parameters</a> 48 </h6> 49<div class="informaltable"><table class="table"> 50<colgroup> 51<col> 52<col> 53<col> 54<col> 55</colgroup> 56<thead><tr> 57<th> 58 <p> 59 Type 60 </p> 61 </th> 62<th> 63 <p> 64 Concept 65 </p> 66 </th> 67<th> 68 <p> 69 Name 70 </p> 71 </th> 72<th> 73 <p> 74 Description 75 </p> 76 </th> 77</tr></thead> 78<tbody> 79<tr> 80<td> 81 <p> 82 Geometry1 const & 83 </p> 84 </td> 85<td> 86 <p> 87 Any type fulfilling a Geometry Concept 88 </p> 89 </td> 90<td> 91 <p> 92 geometry1 93 </p> 94 </td> 95<td> 96 <p> 97 Input geometry 98 </p> 99 </td> 100</tr> 101<tr> 102<td> 103 <p> 104 Geometry2 const & 105 </p> 106 </td> 107<td> 108 <p> 109 Any type fulfilling a Geometry Concept 110 </p> 111 </td> 112<td> 113 <p> 114 geometry2 115 </p> 116 </td> 117<td> 118 <p> 119 Input geometry 120 </p> 121 </td> 122</tr> 123</tbody> 124</table></div> 125<h6> 126<a name="geometry.reference.algorithms.discrete_hausdorff_distance.discrete_hausdorff_distance_2.h2"></a> 127 <span class="phrase"><a name="geometry.reference.algorithms.discrete_hausdorff_distance.discrete_hausdorff_distance_2.header"></a></span><a class="link" href="discrete_hausdorff_distance_2.html#geometry.reference.algorithms.discrete_hausdorff_distance.discrete_hausdorff_distance_2.header">Header</a> 128 </h6> 129<p> 130 Either 131 </p> 132<p> 133 <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> 134 </p> 135<p> 136 Or 137 </p> 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">algorithms</span><span class="special">/</span><span class="identifier">discrete_hausdorff_distance</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code> 140 </p> 141<h6> 142<a name="geometry.reference.algorithms.discrete_hausdorff_distance.discrete_hausdorff_distance_2.h3"></a> 143 <span class="phrase"><a name="geometry.reference.algorithms.discrete_hausdorff_distance.discrete_hausdorff_distance_2.behavior"></a></span><a class="link" href="discrete_hausdorff_distance_2.html#geometry.reference.algorithms.discrete_hausdorff_distance.discrete_hausdorff_distance_2.behavior">Behavior</a> 144 </h6> 145<p> 146 The algorithm calculate discrete hausdorff distance between two geometries. 147 </p> 148<div class="note"><table border="0" summary="Note"> 149<tr> 150<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../../doc/src/images/note.png"></td> 151<th align="left">Note</th> 152</tr> 153<tr><td align="left" valign="top"><p> 154 The units of the distance depends on strategy. In order to change the 155 default behavior a user has to create a strategy and pass it explicitly 156 into the algorithm. 157 </p></td></tr> 158</table></div> 159<h6> 160<a name="geometry.reference.algorithms.discrete_hausdorff_distance.discrete_hausdorff_distance_2.h4"></a> 161 <span class="phrase"><a name="geometry.reference.algorithms.discrete_hausdorff_distance.discrete_hausdorff_distance_2.example"></a></span><a class="link" href="discrete_hausdorff_distance_2.html#geometry.reference.algorithms.discrete_hausdorff_distance.discrete_hausdorff_distance_2.example">Example</a> 162 </h6> 163<p> 164 Calculate Similarity between two geometries as the discrete hasdorff 165 distance between them. 166 </p> 167<p> 168</p> 169<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span> 170 171<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> 172<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> 173<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">linestring</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 174 175<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> 176<span class="special">{</span> 177 <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_type</span><span class="special">;</span> 178 <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_type</span><span class="special">></span> <span class="identifier">linestring_type</span><span class="special">;</span> 179 180 <span class="identifier">linestring_type</span> <span class="identifier">ls1</span><span class="special">,</span> <span class="identifier">ls2</span><span class="special">;</span> 181 <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 0,1 1,1 2,2 1,2 2)"</span><span class="special">,</span> <span class="identifier">ls2</span><span class="special">);</span> 182 <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(1 0,0 1,1 1,2 1,3 1)"</span><span class="special">,</span> <span class="identifier">ls2</span><span class="special">);</span> 183 184 <span class="keyword">double</span> <span class="identifier">res</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">discrete_hausdorff_distance</span><span class="special">(</span><span class="identifier">ls1</span><span class="special">,</span> <span class="identifier">ls2</span><span class="special">);</span> 185 186 <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Discrete Hausdorff Distance: "</span> <span class="special"><<</span> <span class="identifier">res</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> 187 188 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 189<span class="special">}</span> 190</pre> 191<p> 192 </p> 193<p> 194 Output: 195 </p> 196<pre class="programlisting">Discrete Hausdorff Distance: 1.0 197</pre> 198</div> 199<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 200<td align="left"></td> 201<td align="right"><div class="copyright-footer">Copyright © 2009-2019 Barend Gehrels, Bruno Lalande, Mateusz Loskot, Adam 202 Wulkiewicz, Oracle and/or its affiliates<p> 203 Distributed under the Boost Software License, Version 1.0. (See accompanying 204 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>) 205 </p> 206</div></td> 207</tr></table> 208<hr> 209<div class="spirit-nav"> 210<a accesskey="p" href="discrete_hausdorff_distance_3_with_strategy.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../discrete_hausdorff_distance.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="../disjoint.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 211</div> 212</body> 213</html> 214
