<!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"/> <title>GEOS: geos::simplify::DouglasPeuckerSimplifier Class Reference</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <link href="doxygen.css" rel="stylesheet" type="text/css"/> </head> <body> <!-- Generated by Doxygen 1.7.1 --> <div class="navigation" id="top"> <div class="tabs"> <ul class="tablist"> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="pages.html"><span>Related 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 class="tabs2"> <ul class="tablist"> <li><a href="annotated.html"><span>Class List</span></a></li> <li><a href="hierarchy.html"><span>Class Hierarchy</span></a></li> <li><a href="functions.html"><span>Class Members</span></a></li> </ul> </div> <div class="navpath"> <ul> <li><a class="el" href="namespacegeos.html">geos</a> </li> <li><b>simplify</b> </li> <li><a class="el" href="classgeos_1_1simplify_1_1DouglasPeuckerSimplifier.html">geos::simplify::DouglasPeuckerSimplifier</a> </li> </ul> </div> </div> <div class="header"> <div class="summary"> <a href="#pub-methods">Public Member Functions</a> | <a href="#pub-static-methods">Static Public Member Functions</a> </div> <div class="headertitle"> <h1>geos::simplify::DouglasPeuckerSimplifier Class Reference</h1> </div> </div> <div class="contents"> <!-- doxytag: class="geos::simplify::DouglasPeuckerSimplifier" --> <p>Simplifies a Geometry using the standard Douglas-Peucker algorithm. <a href="#_details">More...</a></p> <p><code>#include <<a class="el" href="DouglasPeuckerSimplifier_8h_source.html">DouglasPeuckerSimplifier.h</a>></code></p> <p><a href="classgeos_1_1simplify_1_1DouglasPeuckerSimplifier-members.html">List of all members.</a></p> <table class="memberdecls"> <tr><td colspan="2"><h2><a name="pub-methods"></a> Public Member Functions</h2></td></tr> <tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a93a33955dfb393ba359281623bd75616"></a><!-- doxytag: member="geos::simplify::DouglasPeuckerSimplifier::DouglasPeuckerSimplifier" ref="a93a33955dfb393ba359281623bd75616" args="(const geom::Geometry *geom)" --> </td><td class="memItemRight" valign="bottom"><b>DouglasPeuckerSimplifier</b> (const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> *geom)</td></tr> <tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1simplify_1_1DouglasPeuckerSimplifier.html#aef7fadc6a278ebcecb6c21813306a328">setDistanceTolerance</a> (double tolerance)</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Sets the distance tolerance for the simplification. <a href="#aef7fadc6a278ebcecb6c21813306a328"></a><br/></td></tr> <tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a41f6f32818f2223aac67b4b4eadf9de5"></a><!-- doxytag: member="geos::simplify::DouglasPeuckerSimplifier::getResultGeometry" ref="a41f6f32818f2223aac67b4b4eadf9de5" args="()" --> std::auto_ptr< <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> > </td><td class="memItemRight" valign="bottom"><b>getResultGeometry</b> ()</td></tr> <tr><td colspan="2"><h2><a name="pub-static-methods"></a> Static Public Member Functions</h2></td></tr> <tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a34a2490b21fcc91280978a3e71c0e298"></a><!-- doxytag: member="geos::simplify::DouglasPeuckerSimplifier::simplify" ref="a34a2490b21fcc91280978a3e71c0e298" args="(const geom::Geometry *geom, double tolerance)" --> static std::auto_ptr<br class="typebreak"/> < <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> > </td><td class="memItemRight" valign="bottom"><b>simplify</b> (const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> *geom, double tolerance)</td></tr> </table> <hr/><a name="_details"></a><h2>Detailed Description</h2> <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> <hr/><h2>Member Function Documentation</h2> <a class="anchor" id="aef7fadc6a278ebcecb6c21813306a328"></a><!-- doxytag: member="geos::simplify::DouglasPeuckerSimplifier::setDistanceTolerance" ref="aef7fadc6a278ebcecb6c21813306a328" args="(double tolerance)" --> <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 </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><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>distanceTolerance</em> </td><td>the approximation tolerance to use </td></tr> </table> </dd> </dl> </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> <hr class="footer"/><address class="footer"><small>Generated on Thu Jul 22 2010 for GEOS by <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.7.1 </small></address> </body> </html>