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<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_1TopologyPreservingSimplifier.html">TopologyPreservingSimplifier</a></li> </ul>
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<p>Simplifies a geometry, ensuring that the result is a valid geometry having the same dimension and number of components as the input.
<a href="classgeos_1_1simplify_1_1TopologyPreservingSimplifier.html#details">More...</a></p>
<p><code>#include &lt;<a class="el" href="TopologyPreservingSimplifier_8h_source.html">TopologyPreservingSimplifier.h</a>&gt;</code></p>
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Public Member Functions</h2></td></tr>
<tr class="memitem:ac49755ec6f280635d1562a38567d74d4"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1simplify_1_1TopologyPreservingSimplifier.html#ac49755ec6f280635d1562a38567d74d4">TopologyPreservingSimplifier</a> (const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> *geom)</td></tr>
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<tr class="memitem:a9e387d4f27f7bf6284368484b3b5f23c"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1simplify_1_1TopologyPreservingSimplifier.html#a9e387d4f27f7bf6284368484b3b5f23c">setDistanceTolerance</a> (double tolerance)</td></tr>
<tr class="memdesc:a9e387d4f27f7bf6284368484b3b5f23c"><td class="mdescLeft">&#160;</td><td class="mdescRight">Sets the distance tolerance for the simplification. <a href="#a9e387d4f27f7bf6284368484b3b5f23c">More...</a><br /></td></tr>
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<tr class="memitem:a4a88ca1664b7c4955a30342f7a3cf349"><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_1TopologyPreservingSimplifier.html#a4a88ca1664b7c4955a30342f7a3cf349">getResultGeometry</a> ()</td></tr>
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Static Public Member Functions</h2></td></tr>
<tr class="memitem:aee60d91e45049364f2431e60b43abfc9"><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_1TopologyPreservingSimplifier.html#aee60d91e45049364f2431e60b43abfc9">simplify</a> (const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> *geom, double tolerance)</td></tr>
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Private Attributes</h2></td></tr>
<tr class="memitem:a95aa253921dff154fae7edc16ebd1eeb"><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_1TopologyPreservingSimplifier.html#a95aa253921dff154fae7edc16ebd1eeb">inputGeom</a></td></tr>
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<tr class="memitem:a5f6cc23987ed05017c1f28830f173e18"><td class="memItemLeft" align="right" valign="top">std::unique_ptr&lt; <a class="el" href="classgeos_1_1simplify_1_1TaggedLinesSimplifier.html">TaggedLinesSimplifier</a> &gt;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1simplify_1_1TopologyPreservingSimplifier.html#a5f6cc23987ed05017c1f28830f173e18">lineSimplifier</a></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Simplifies a geometry, ensuring that the result is a valid geometry having the same dimension and number of components as the input. </p>
<p>The simplification uses a maximum distance difference algorithm similar to the one used in the Douglas-Peucker algorithm.</p>
<p>In particular, if the input is an areal geometry ( Polygon or MultiPolygon )</p>
<ul>
<li>The result has the same number of shells and holes (rings) as the input, in the same order</li>
<li>The result rings touch at <b>no more</b> than the number of touching point in the input (although they may touch at fewer points) </li>
</ul>
<p>Definition at line <a class="el" href="TopologyPreservingSimplifier_8h_source.html#l00057">57</a> of file <a class="el" href="TopologyPreservingSimplifier_8h_source.html">TopologyPreservingSimplifier.h</a>.</p>
</div><h2 class="groupheader">Constructor &amp; Destructor Documentation</h2>
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<td class="memname">geos::simplify::TopologyPreservingSimplifier::TopologyPreservingSimplifier </td>
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<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>
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<h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">std::unique_ptr&lt;<a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a>&gt; geos::simplify::TopologyPreservingSimplifier::getResultGeometry </td>
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<td class="memname">void geos::simplify::TopologyPreservingSimplifier::setDistanceTolerance </td>
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<td class="paramtype">double&#160;</td>
<td class="paramname"><em>tolerance</em></td><td>)</td>
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<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>
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<tr><td class="paramname">tolerance</td><td>the approximation tolerance to use </td></tr>
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<td class="memname">static std::unique_ptr&lt;<a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a>&gt; geos::simplify::TopologyPreservingSimplifier::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>
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<td class="paramtype">double&#160;</td>
<td class="paramname"><em>tolerance</em>&#160;</td>
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<h2 class="groupheader">Member Data Documentation</h2>
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<td class="memname">const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a>* geos::simplify::TopologyPreservingSimplifier::inputGeom</td>
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<p>Definition at line <a class="el" href="TopologyPreservingSimplifier_8h_source.html#l00083">83</a> of file <a class="el" href="TopologyPreservingSimplifier_8h_source.html">TopologyPreservingSimplifier.h</a>.</p>
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<td class="memname">std::unique_ptr&lt;<a class="el" href="classgeos_1_1simplify_1_1TaggedLinesSimplifier.html">TaggedLinesSimplifier</a>&gt; geos::simplify::TopologyPreservingSimplifier::lineSimplifier</td>
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<p>Definition at line <a class="el" href="TopologyPreservingSimplifier_8h_source.html#l00085">85</a> of file <a class="el" href="TopologyPreservingSimplifier_8h_source.html">TopologyPreservingSimplifier.h</a>.</p>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="TopologyPreservingSimplifier_8h_source.html">TopologyPreservingSimplifier.h</a></li>
</ul>
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