darkblueb
/
geos_390_docs
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
geos_390_docs/classgeos_1_1simplify_1_1Do...

250 lines
13 KiB
HTML
Raw Permalink Blame History

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<meta name="generator" content="Doxygen 1.8.11"/>
<title>GEOS: geos::simplify::DouglasPeuckerSimplifier Class Reference</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr style="height: 56px;">
<td id="projectalign" style="padding-left: 0.5em;">
<div id="projectname">GEOS
&#160;<span id="projectnumber">3.9.1dev</span>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.11 -->
<div id="navrow1" class="tabs">
<ul class="tablist">
<li><a href="index.html"><span>Main&#160;Page</span></a></li>
<li><a href="pages.html"><span>Related&#160;Pages</span></a></li>
<li><a href="namespaces.html"><span>Namespaces</span></a></li>
<li class="current"><a href="annotated.html"><span>Classes</span></a></li>
<li><a href="files.html"><span>Files</span></a></li>
</ul>
</div>
<div id="navrow2" class="tabs2">
<ul class="tablist">
<li><a href="annotated.html"><span>Class&#160;List</span></a></li>
<li><a href="inherits.html"><span>Class&#160;Hierarchy</span></a></li>
<li><a href="functions.html"><span>Class&#160;Members</span></a></li>
</ul>
</div>
<div id="nav-path" class="navpath">
<ul>
<li class="navelem"><a class="el" href="namespacegeos.html">geos</a></li><li class="navelem"><a class="el" href="namespacegeos_1_1simplify.html">simplify</a></li><li class="navelem"><a class="el" href="classgeos_1_1simplify_1_1DouglasPeuckerSimplifier.html">DouglasPeuckerSimplifier</a></li> </ul>
</div>
</div><!-- top -->
<div class="header">
<div class="summary">
<a href="#pub-methods">Public Member Functions</a> &#124;
<a href="#pub-static-methods">Static Public Member Functions</a> &#124;
<a href="#pri-attribs">Private Attributes</a> &#124;
<a href="classgeos_1_1simplify_1_1DouglasPeuckerSimplifier-members.html">List of all members</a> </div>
<div class="headertitle">
<div class="title">geos::simplify::DouglasPeuckerSimplifier Class Reference</div> </div>
</div><!--header-->
<div class="contents">
<p>Simplifies a Geometry using the standard Douglas-Peucker algorithm.
<a href="classgeos_1_1simplify_1_1DouglasPeuckerSimplifier.html#details">More...</a></p>
<p><code>#include &lt;<a class="el" href="DouglasPeuckerSimplifier_8h_source.html">DouglasPeuckerSimplifier.h</a>&gt;</code></p>
<div class="dynheader">
Collaboration diagram for geos::simplify::DouglasPeuckerSimplifier:</div>
<div class="dyncontent">
<div class="center"><div class="zoom"><iframe scrolling="no" frameborder="0" src="classgeos_1_1simplify_1_1DouglasPeuckerSimplifier__coll__graph.svg" width="100%" height="431"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe></div>
</div>
<center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a93a33955dfb393ba359281623bd75616"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1simplify_1_1DouglasPeuckerSimplifier.html#a93a33955dfb393ba359281623bd75616">DouglasPeuckerSimplifier</a> (const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> *geom)</td></tr>
<tr class="separator:a93a33955dfb393ba359281623bd75616"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aef7fadc6a278ebcecb6c21813306a328"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1simplify_1_1DouglasPeuckerSimplifier.html#aef7fadc6a278ebcecb6c21813306a328">setDistanceTolerance</a> (double tolerance)</td></tr>
<tr class="memdesc:aef7fadc6a278ebcecb6c21813306a328"><td class="mdescLeft">&#160;</td><td class="mdescRight">Sets the distance tolerance for the simplification. <a href="#aef7fadc6a278ebcecb6c21813306a328">More...</a><br /></td></tr>
<tr class="separator:aef7fadc6a278ebcecb6c21813306a328"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a63f76ae1393b70728d0987ec05e7a7d6"><td class="memItemLeft" align="right" valign="top">std::unique_ptr&lt; <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> &gt;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1simplify_1_1DouglasPeuckerSimplifier.html#a63f76ae1393b70728d0987ec05e7a7d6">getResultGeometry</a> ()</td></tr>
<tr class="separator:a63f76ae1393b70728d0987ec05e7a7d6"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a>
Static Public Member Functions</h2></td></tr>
<tr class="memitem:a2cfdb2391067c7670478dc3e8186d708"><td class="memItemLeft" align="right" valign="top">static std::unique_ptr&lt; <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> &gt;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1simplify_1_1DouglasPeuckerSimplifier.html#a2cfdb2391067c7670478dc3e8186d708">simplify</a> (const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> *geom, double tolerance)</td></tr>
<tr class="separator:a2cfdb2391067c7670478dc3e8186d708"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pri-attribs"></a>
Private Attributes</h2></td></tr>
<tr class="memitem:a98f9ecb6d64ec6f8bc7865e13586330a"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1simplify_1_1DouglasPeuckerSimplifier.html#a98f9ecb6d64ec6f8bc7865e13586330a">inputGeom</a></td></tr>
<tr class="separator:a98f9ecb6d64ec6f8bc7865e13586330a"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a75b460d0cf7f1120dfa077186d46bd95"><td class="memItemLeft" align="right" valign="top">double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1simplify_1_1DouglasPeuckerSimplifier.html#a75b460d0cf7f1120dfa077186d46bd95">distanceTolerance</a></td></tr>
<tr class="separator:a75b460d0cf7f1120dfa077186d46bd95"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Simplifies a Geometry using the standard Douglas-Peucker algorithm. </p>
<p>Ensures that any polygonal geometries returned are valid. Simple lines are not guaranteed to remain simple after simplification.</p>
<p>Note that in general D-P does not preserve topology - e.g. polygons can be split, collapse to lines or disappear holes can be created or disappear, and lines can cross. To simplify geometry while preserving topology use <a class="el" href="classgeos_1_1simplify_1_1TopologyPreservingSimplifier.html" title="Simplifies a geometry, ensuring that the result is a valid geometry having the same dimension and num...">TopologyPreservingSimplifier</a>. (However, using D-P is significantly faster). </p>
<p>Definition at line <a class="el" href="DouglasPeuckerSimplifier_8h_source.html#l00050">50</a> of file <a class="el" href="DouglasPeuckerSimplifier_8h_source.html">DouglasPeuckerSimplifier.h</a>.</p>
</div><h2 class="groupheader">Constructor &amp; Destructor Documentation</h2>
<a class="anchor" id="a93a33955dfb393ba359281623bd75616"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">geos::simplify::DouglasPeuckerSimplifier::DouglasPeuckerSimplifier </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> *&#160;</td>
<td class="paramname"><em>geom</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<h2 class="groupheader">Member Function Documentation</h2>
<a class="anchor" id="a63f76ae1393b70728d0987ec05e7a7d6"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">std::unique_ptr&lt;<a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a>&gt; geos::simplify::DouglasPeuckerSimplifier::getResultGeometry </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<a class="anchor" id="aef7fadc6a278ebcecb6c21813306a328"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void geos::simplify::DouglasPeuckerSimplifier::setDistanceTolerance </td>
<td>(</td>
<td class="paramtype">double&#160;</td>
<td class="paramname"><em>tolerance</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Sets the distance tolerance for the simplification. </p>
<p>All vertices in the simplified geometry will be within this distance of the original geometry. The tolerance value must be non-negative. A tolerance value of zero is effectively a no-op.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">tolerance</td><td>the approximation tolerance to use </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="a2cfdb2391067c7670478dc3e8186d708"></a>
<div class="memitem">
<div class="memproto">
<table class="mlabels">
<tr>
<td class="mlabels-left">
<table class="memname">
<tr>
<td class="memname">static std::unique_ptr&lt;<a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a>&gt; geos::simplify::DouglasPeuckerSimplifier::simplify </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> *&#160;</td>
<td class="paramname"><em>geom</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double&#160;</td>
<td class="paramname"><em>tolerance</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">static</span></span> </td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<h2 class="groupheader">Member Data Documentation</h2>
<a class="anchor" id="a75b460d0cf7f1120dfa077186d46bd95"></a>
<div class="memitem">
<div class="memproto">
<table class="mlabels">
<tr>
<td class="mlabels-left">
<table class="memname">
<tr>
<td class="memname">double geos::simplify::DouglasPeuckerSimplifier::distanceTolerance</td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">private</span></span> </td>
</tr>
</table>
</div><div class="memdoc">
<p>Definition at line <a class="el" href="DouglasPeuckerSimplifier_8h_source.html#l00079">79</a> of file <a class="el" href="DouglasPeuckerSimplifier_8h_source.html">DouglasPeuckerSimplifier.h</a>.</p>
</div>
</div>
<a class="anchor" id="a98f9ecb6d64ec6f8bc7865e13586330a"></a>
<div class="memitem">
<div class="memproto">
<table class="mlabels">
<tr>
<td class="mlabels-left">
<table class="memname">
<tr>
<td class="memname">const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a>* geos::simplify::DouglasPeuckerSimplifier::inputGeom</td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">private</span></span> </td>
</tr>
</table>
</div><div class="memdoc">
<p>Definition at line <a class="el" href="DouglasPeuckerSimplifier_8h_source.html#l00077">77</a> of file <a class="el" href="DouglasPeuckerSimplifier_8h_source.html">DouglasPeuckerSimplifier.h</a>.</p>
</div>
</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="DouglasPeuckerSimplifier_8h_source.html">DouglasPeuckerSimplifier.h</a></li>
</ul>
</div><!-- contents -->
<!-- start footer part -->
<hr class="footer"/><address class="footer"><small>
Generated by &#160;<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/>
</a> 1.8.11
</small></address>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink