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424 lines
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<a href="#pub-methods">Public Member Functions</a> |
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<p>Computes an approximate intersection of two line segments by taking the most central of the endpoints of the segments.
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<a href="classgeos_1_1algorithm_1_1CentralEndpointIntersector.html#details">More...</a></p>
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<p><code>#include <<a class="el" href="CentralEndpointIntersector_8h_source.html">CentralEndpointIntersector.h</a>></code></p>
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Collaboration diagram for geos::algorithm::CentralEndpointIntersector:</div>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:a56ec030bb80411d71e89bb5d1d7c4cb6"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1CentralEndpointIntersector.html#a56ec030bb80411d71e89bb5d1d7c4cb6">CentralEndpointIntersector</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p00, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p01, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p10, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p11)</td></tr>
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<tr class="memitem:ac3a89d035a86575d64cea70bf15c5eab"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1CentralEndpointIntersector.html#ac3a89d035a86575d64cea70bf15c5eab">getIntersection</a> () const </td></tr>
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Static Public Member Functions</h2></td></tr>
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<tr class="memitem:a211c7713eb75c1ab668c418bf3a4279a"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1CentralEndpointIntersector.html#a211c7713eb75c1ab668c418bf3a4279a">getIntersection</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p00, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p01, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p10, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p11)</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pri-methods"></a>
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Private Member Functions</h2></td></tr>
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<tr class="memitem:aedc172ba92a6c51fe0e8980a2ec1d827"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1CentralEndpointIntersector.html#aedc172ba92a6c51fe0e8980a2ec1d827">compute</a> ()</td></tr>
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<tr class="memitem:a8a31ccf786fef55ca199b8d2a7f5543a"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1CentralEndpointIntersector.html#a8a31ccf786fef55ca199b8d2a7f5543a">findNearestPoint</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p, const std::vector< <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> > &pts) const </td></tr>
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Static Private Member Functions</h2></td></tr>
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<tr class="memitem:a9cc2cef18a587ebda0f2d73f221c9ae5"><td class="memItemLeft" align="right" valign="top">static <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1CentralEndpointIntersector.html#a9cc2cef18a587ebda0f2d73f221c9ae5">average</a> (const std::vector< <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> > &pts)</td></tr>
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Private Attributes</h2></td></tr>
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<tr class="memitem:abe96ee7071a0411418eeeb178fb1f968"><td class="memItemLeft" align="right" valign="top">std::vector< <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1CentralEndpointIntersector.html#abe96ee7071a0411418eeeb178fb1f968">_pts</a></td></tr>
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<tr class="memitem:a2c0b4d22924947bd70d3dc191130ddc1"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1CentralEndpointIntersector.html#a2c0b4d22924947bd70d3dc191130ddc1">_intPt</a></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Computes an approximate intersection of two line segments by taking the most central of the endpoints of the segments. </p>
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<p>This is effective in cases where the segments are nearly parallel and should intersect at an endpoint. It is also a reasonable strategy for cases where the endpoint of one segment lies on or almost on the interior of another one. Taking the most central endpoint ensures that the computed intersection point lies in the envelope of the segments. Also, by always returning one of the input points, this should result in reducing segment fragmentation. Intended to be used as a last resort for computing ill-conditioned intersection situations which cause other methods to fail.</p>
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<dl class="section author"><dt>Author</dt><dd>Martin Davis </dd></dl>
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<dl class="section version"><dt>Version</dt><dd>1.8 </dd></dl>
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<p>Definition at line <a class="el" href="CentralEndpointIntersector_8h_source.html#l00062">62</a> of file <a class="el" href="CentralEndpointIntersector_8h_source.html">CentralEndpointIntersector.h</a>.</p>
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</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<td class="memname">geos::algorithm::CentralEndpointIntersector::CentralEndpointIntersector </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> & </td>
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<td class="paramname"><em>p00</em>, </td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> & </td>
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<td class="paramname"><em>p01</em>, </td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> & </td>
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<td class="paramname"><em>p10</em>, </td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> & </td>
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<td class="paramname"><em>p11</em> </td>
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<p>Definition at line <a class="el" href="CentralEndpointIntersector_8h_source.html#l00075">75</a> of file <a class="el" href="CentralEndpointIntersector_8h_source.html">CentralEndpointIntersector.h</a>.</p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">static <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> geos::algorithm::CentralEndpointIntersector::average </td>
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<td>(</td>
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<td class="paramtype">const std::vector< <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> > & </td>
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<p>Definition at line <a class="el" href="CentralEndpointIntersector_8h_source.html#l00112">112</a> of file <a class="el" href="CentralEndpointIntersector_8h_source.html">CentralEndpointIntersector.h</a>.</p>
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<p>References <a class="el" href="Coordinate_8h_source.html#l00080">geos::geom::Coordinate::x</a>, and <a class="el" href="Coordinate_8h_source.html#l00083">geos::geom::Coordinate::y</a>.</p>
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<td class="memname">void geos::algorithm::CentralEndpointIntersector::compute </td>
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<td>(</td>
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<p>Definition at line <a class="el" href="CentralEndpointIntersector_8h_source.html#l00105">105</a> of file <a class="el" href="CentralEndpointIntersector_8h_source.html">CentralEndpointIntersector.h</a>.</p>
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<td class="memname"><a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> geos::algorithm::CentralEndpointIntersector::findNearestPoint </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> & </td>
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<p>Determines a point closest to the given point.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">p</td><td>the point to compare against </td></tr>
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<tr><td class="paramname">p1</td><td>a potential result point </td></tr>
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<tr><td class="paramname">p2</td><td>a potential result point </td></tr>
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<tr><td class="paramname">q1</td><td>a potential result point </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>the point closest to the input point p </dd></dl>
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<p>Definition at line <a class="el" href="CentralEndpointIntersector_8h_source.html#l00140">140</a> of file <a class="el" href="CentralEndpointIntersector_8h_source.html">CentralEndpointIntersector.h</a>.</p>
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<p>References <a class="el" href="classgeos_1_1geom_1_1Coordinate.html#af351abe86cf377f506413aa869f8959a">geos::geom::Coordinate::distanceSquared()</a>, and <a class="el" href="classgeos_1_1geom_1_1Coordinate.html#a45201240fe444687d56c1e3cb751d8df">geos::geom::Coordinate::getNull()</a>.</p>
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<td class="memname">static const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a>& geos::algorithm::CentralEndpointIntersector::getIntersection </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> & </td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> & </td>
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<p>Definition at line <a class="el" href="CentralEndpointIntersector_8h_source.html#l00067">67</a> of file <a class="el" href="CentralEndpointIntersector_8h_source.html">CentralEndpointIntersector.h</a>.</p>
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<p>References <a class="el" href="CentralEndpointIntersector_8h_source.html#l00067">getIntersection()</a>.</p>
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<p>Referenced by <a class="el" href="CentralEndpointIntersector_8h_source.html#l00067">getIntersection()</a>.</p>
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<div class="center"><iframe scrolling="no" frameborder="0" src="classgeos_1_1algorithm_1_1CentralEndpointIntersector_a211c7713eb75c1ab668c418bf3a4279a_icgraph.svg" width="260" height="79"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe>
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<td class="memname">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a>& geos::algorithm::CentralEndpointIntersector::getIntersection </td>
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<td>(</td>
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<p>Definition at line <a class="el" href="CentralEndpointIntersector_8h_source.html#l00090">90</a> of file <a class="el" href="CentralEndpointIntersector_8h_source.html">CentralEndpointIntersector.h</a>.</p>
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<h2 class="groupheader">Member Data Documentation</h2>
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<td class="memname"><a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> geos::algorithm::CentralEndpointIntersector::_intPt</td>
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<p>Definition at line <a class="el" href="CentralEndpointIntersector_8h_source.html#l00102">102</a> of file <a class="el" href="CentralEndpointIntersector_8h_source.html">CentralEndpointIntersector.h</a>.</p>
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<td class="memname">std::vector<<a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a>> geos::algorithm::CentralEndpointIntersector::_pts</td>
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<p>Definition at line <a class="el" href="CentralEndpointIntersector_8h_source.html#l00100">100</a> of file <a class="el" href="CentralEndpointIntersector_8h_source.html">CentralEndpointIntersector.h</a>.</p>
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<hr/>The documentation for this class was generated from the following file:<ul>
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<li><a class="el" href="CentralEndpointIntersector_8h_source.html">CentralEndpointIntersector.h</a></li>
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