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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_1algorithm.html">algorithm</a></li><li class="navelem"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounter.html">RayCrossingCounter</a></li> </ul>
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<div class="title">geos::algorithm::RayCrossingCounter Class Reference</div> </div>
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<p>Counts the number of segments crossed by a horizontal ray extending to the right from a given point, in an incremental fashion.
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<a href="classgeos_1_1algorithm_1_1RayCrossingCounter.html#details">More...</a></p>
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<p><code>#include <<a class="el" href="RayCrossingCounter_8h_source.html">RayCrossingCounter.h</a>></code></p>
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Collaboration diagram for geos::algorithm::RayCrossingCounter:</div>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:a3f0c214c00e92e3173ef5efdee0afe67"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounter.html#a3f0c214c00e92e3173ef5efdee0afe67">RayCrossingCounter</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p_point)</td></tr>
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<tr class="separator:a3f0c214c00e92e3173ef5efdee0afe67"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ac6141964164d1f11d5358f367f0323a8"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounter.html#ac6141964164d1f11d5358f367f0323a8">countSegment</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p1, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p2)</td></tr>
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<tr class="memdesc:ac6141964164d1f11d5358f367f0323a8"><td class="mdescLeft"> </td><td class="mdescRight">Counts a segment. <a href="#ac6141964164d1f11d5358f367f0323a8">More...</a><br /></td></tr>
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<tr class="separator:ac6141964164d1f11d5358f367f0323a8"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aa1a0b63601c69e817aa262617667a41b"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounter.html#aa1a0b63601c69e817aa262617667a41b">isOnSegment</a> ()</td></tr>
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<tr class="memdesc:aa1a0b63601c69e817aa262617667a41b"><td class="mdescLeft"> </td><td class="mdescRight">Reports whether the point lies exactly on one of the supplied segments. <a href="#aa1a0b63601c69e817aa262617667a41b">More...</a><br /></td></tr>
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<tr class="separator:aa1a0b63601c69e817aa262617667a41b"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a5fe9f0a82e22a07790f8503d1dea888b"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespacegeos_1_1geom.html#ae55a225cd843a6b153a7b6ca5a4707c8">geom::Location</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounter.html#a5fe9f0a82e22a07790f8503d1dea888b">getLocation</a> ()</td></tr>
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<tr class="memdesc:a5fe9f0a82e22a07790f8503d1dea888b"><td class="mdescLeft"> </td><td class="mdescRight">Gets the <a class="el" href="namespacegeos_1_1geom.html#ae55a225cd843a6b153a7b6ca5a4707c8">Location</a> of the point relative to the ring, polygon or multipolygon from which the processed segments were provided. <a href="#a5fe9f0a82e22a07790f8503d1dea888b">More...</a><br /></td></tr>
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<tr class="separator:a5fe9f0a82e22a07790f8503d1dea888b"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ac83a02448d715c95644c13a03c7b5532"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounter.html#ac83a02448d715c95644c13a03c7b5532">isPointInPolygon</a> ()</td></tr>
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<tr class="memdesc:ac83a02448d715c95644c13a03c7b5532"><td class="mdescLeft"> </td><td class="mdescRight">Tests whether the point lies in or on the ring, polygon or multipolygon from which the processed segments were provided. <a href="#ac83a02448d715c95644c13a03c7b5532">More...</a><br /></td></tr>
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<tr class="separator:ac83a02448d715c95644c13a03c7b5532"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a>
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Static Public Member Functions</h2></td></tr>
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<tr class="memitem:aad834286a28d2fbd6c6459d7155f960a"><td class="memItemLeft" align="right" valign="top">static <a class="el" href="namespacegeos_1_1geom.html#ae55a225cd843a6b153a7b6ca5a4707c8">geom::Location</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounter.html#aad834286a28d2fbd6c6459d7155f960a">locatePointInRing</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p, const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> &ring)</td></tr>
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<tr class="memdesc:aad834286a28d2fbd6c6459d7155f960a"><td class="mdescLeft"> </td><td class="mdescRight">Determines the <a class="el" href="namespacegeos_1_1geom.html#ae55a225cd843a6b153a7b6ca5a4707c8">Location</a> of a point in a ring. <a href="#aad834286a28d2fbd6c6459d7155f960a">More...</a><br /></td></tr>
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<tr class="separator:aad834286a28d2fbd6c6459d7155f960a"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a68cf27ef5b63b7f361106c48301ce6dd"><td class="memItemLeft" align="right" valign="top">static <a class="el" href="namespacegeos_1_1geom.html#ae55a225cd843a6b153a7b6ca5a4707c8">geom::Location</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounter.html#a68cf27ef5b63b7f361106c48301ce6dd">locatePointInRing</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p, const std::vector< const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> * > &ring)</td></tr>
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<tr class="memdesc:a68cf27ef5b63b7f361106c48301ce6dd"><td class="mdescLeft"> </td><td class="mdescRight">Semantically equal to the above, just different args encoding. <a href="#a68cf27ef5b63b7f361106c48301ce6dd">More...</a><br /></td></tr>
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<tr class="separator:a68cf27ef5b63b7f361106c48301ce6dd"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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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:a288eb8118a606c656c74029cab8e1e0a"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounter.html#a288eb8118a606c656c74029cab8e1e0a">RayCrossingCounter</a> (const <a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounter.html">RayCrossingCounter</a> &other)=delete</td></tr>
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<tr class="separator:a288eb8118a606c656c74029cab8e1e0a"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a4ebf74b48ebc925a8931c6e60e4b8416"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounter.html">RayCrossingCounter</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounter.html#a4ebf74b48ebc925a8931c6e60e4b8416">operator=</a> (const <a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounter.html">RayCrossingCounter</a> &rhs)=delete</td></tr>
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</table><table class="memberdecls">
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Private Attributes</h2></td></tr>
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<tr class="memitem:aee47ec0b55ccb7d247bf1ea7fad2ffcf"><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_1RayCrossingCounter.html#aee47ec0b55ccb7d247bf1ea7fad2ffcf">point</a></td></tr>
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<tr class="separator:aee47ec0b55ccb7d247bf1ea7fad2ffcf"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a887ecdaa3d6d674617003072880a472c"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounter.html#a887ecdaa3d6d674617003072880a472c">crossingCount</a></td></tr>
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<tr class="separator:a887ecdaa3d6d674617003072880a472c"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ab359e039d9413dc25b8cc38c375746e9"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounter.html#ab359e039d9413dc25b8cc38c375746e9">isPointOnSegment</a></td></tr>
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<tr class="separator:ab359e039d9413dc25b8cc38c375746e9"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Counts the number of segments crossed by a horizontal ray extending to the right from a given point, in an incremental fashion. </p>
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<p>This can be used to determine whether a point lies in a polygonal geometry. The class determines the situation where the point lies exactly on a segment. When being used for Point-In-Polygon determination, this case allows short-circuiting the evaluation.</p>
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<p>This class handles polygonal geometries with any number of shells and holes. The orientation of the shell and hole rings is unimportant. In order to compute a correct location for a given polygonal geometry, it is essential that <b>all</b> segments are counted which</p>
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<ul>
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<li>touch the ray</li>
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<li>lie in in any ring which may contain the point</li>
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</ul>
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<p>The only exception is when the point-on-segment situation is detected, in which case no further processing is required. The implication of the above rule is that segments which can be a priori determined to <em>not</em> touch the ray (i.e. by a test of their bounding box or Y-extent) do not need to be counted. This allows for optimization by indexing.</p>
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<dl class="section author"><dt>Author</dt><dd>Martin Davis </dd></dl>
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<p>Definition at line <a class="el" href="RayCrossingCounter_8h_source.html#l00065">65</a> of file <a class="el" href="RayCrossingCounter_8h_source.html">RayCrossingCounter.h</a>.</p>
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</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<td class="memname">geos::algorithm::RayCrossingCounter::RayCrossingCounter </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounter.html">RayCrossingCounter</a> & </td>
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<td class="paramname"><em>other</em></td><td>)</td>
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<span class="mlabels"><span class="mlabel">private</span><span class="mlabel">delete</span></span> </td>
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<td class="memname">geos::algorithm::RayCrossingCounter::RayCrossingCounter </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>p_point</em></td><td>)</td>
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<p>Definition at line <a class="el" href="RayCrossingCounter_8h_source.html#l00095">95</a> of file <a class="el" href="RayCrossingCounter_8h_source.html">RayCrossingCounter.h</a>.</p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">void geos::algorithm::RayCrossingCounter::countSegment </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>p1</em>, </td>
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<td class="paramname"><em>p2</em> </td>
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<p>Counts a segment. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">p1</td><td>an endpoint of the segment </td></tr>
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<tr><td class="paramname">p2</td><td>another endpoint of the segment </td></tr>
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<td class="memname"><a class="el" href="namespacegeos_1_1geom.html#ae55a225cd843a6b153a7b6ca5a4707c8">geom::Location</a> geos::algorithm::RayCrossingCounter::getLocation </td>
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<p>Gets the <a class="el" href="namespacegeos_1_1geom.html#ae55a225cd843a6b153a7b6ca5a4707c8">Location</a> of the point relative to the ring, polygon or multipolygon from which the processed segments were provided. </p>
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<p>This method only determines the correct location if <b>all</b> relevant segments must have been processed.</p>
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<dl class="section return"><dt>Returns</dt><dd>the Location of the point </dd></dl>
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<td class="memname">bool geos::algorithm::RayCrossingCounter::isOnSegment </td>
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<p>Reports whether the point lies exactly on one of the supplied segments. </p>
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<p>This method may be called at any time as segments are processed. If the result of this method is <code>true</code>, no further segments need be supplied, since the result will never change again.</p>
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<dl class="section return"><dt>Returns</dt><dd><code>true</code> if the point lies exactly on a segment </dd></dl>
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<p>Definition at line <a class="el" href="RayCrossingCounter_8h_source.html#l00120">120</a> of file <a class="el" href="RayCrossingCounter_8h_source.html">RayCrossingCounter.h</a>.</p>
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<td class="memname">bool geos::algorithm::RayCrossingCounter::isPointInPolygon </td>
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<p>Tests whether the point lies in or on the ring, polygon or multipolygon from which the processed segments were provided. </p>
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<dl class="section return"><dt>Returns</dt><dd><code>true</code> if the point lies in or on the supplied polygon </dd></dl>
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<td class="memname">static <a class="el" href="namespacegeos_1_1geom.html#ae55a225cd843a6b153a7b6ca5a4707c8">geom::Location</a> geos::algorithm::RayCrossingCounter::locatePointInRing </td>
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<td>(</td>
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<p>Determines the <a class="el" href="namespacegeos_1_1geom.html#ae55a225cd843a6b153a7b6ca5a4707c8">Location</a> of a point in a ring. </p>
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<p>This method is an exemplar of how to use this class.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">p</td><td>the point to test </td></tr>
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<tr><td class="paramname">ring</td><td>an array of Coordinates forming a ring </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>the location of the point in the ring </dd></dl>
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<td class="memname">static <a class="el" href="namespacegeos_1_1geom.html#ae55a225cd843a6b153a7b6ca5a4707c8">geom::Location</a> geos::algorithm::RayCrossingCounter::locatePointInRing </td>
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<p>Semantically equal to the above, just different args encoding. </p>
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<td class="memname"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounter.html">RayCrossingCounter</a>& geos::algorithm::RayCrossingCounter::operator= </td>
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<h2 class="groupheader">Member Data Documentation</h2>
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<td class="memname">int geos::algorithm::RayCrossingCounter::crossingCount</td>
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<p>Definition at line <a class="el" href="RayCrossingCounter_8h_source.html#l00069">69</a> of file <a class="el" href="RayCrossingCounter_8h_source.html">RayCrossingCounter.h</a>.</p>
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<p>Definition at line <a class="el" href="RayCrossingCounter_8h_source.html#l00072">72</a> of file <a class="el" href="RayCrossingCounter_8h_source.html">RayCrossingCounter.h</a>.</p>
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<td class="memname">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a>& geos::algorithm::RayCrossingCounter::point</td>
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<p>Definition at line <a class="el" href="RayCrossingCounter_8h_source.html#l00067">67</a> of file <a class="el" href="RayCrossingCounter_8h_source.html">RayCrossingCounter.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="RayCrossingCounter_8h_source.html">RayCrossingCounter.h</a></li>
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