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522 lines
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<div class="title">geos::algorithm::RayCrossingCounterDD 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_1RayCrossingCounterDD.html#details">More...</a></p>
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<p><code>#include <<a class="el" href="RayCrossingCounterDD_8h_source.html">RayCrossingCounterDD.h</a>></code></p>
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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:a1f9e4b37c251c12df228f76478e15542"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounterDD.html#a1f9e4b37c251c12df228f76478e15542">RayCrossingCounterDD</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:a1f9e4b37c251c12df228f76478e15542"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a6be057bfdbcf1955179188b2980b37c6"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounterDD.html#a6be057bfdbcf1955179188b2980b37c6">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:a6be057bfdbcf1955179188b2980b37c6"><td class="mdescLeft"> </td><td class="mdescRight">Counts a segment. <a href="#a6be057bfdbcf1955179188b2980b37c6">More...</a><br /></td></tr>
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<tr class="separator:a6be057bfdbcf1955179188b2980b37c6"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a622decf42bc6ecbf316ffa296e61019b"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounterDD.html#a622decf42bc6ecbf316ffa296e61019b">isOnSegment</a> ()</td></tr>
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<tr class="memdesc:a622decf42bc6ecbf316ffa296e61019b"><td class="mdescLeft"> </td><td class="mdescRight">Reports whether the point lies exactly on one of the supplied segments. <a href="#a622decf42bc6ecbf316ffa296e61019b">More...</a><br /></td></tr>
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<tr class="separator:a622decf42bc6ecbf316ffa296e61019b"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a32e946a3adff29e77fc82e7251e2ff9a"><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_1RayCrossingCounterDD.html#a32e946a3adff29e77fc82e7251e2ff9a">getLocation</a> ()</td></tr>
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<tr class="memdesc:a32e946a3adff29e77fc82e7251e2ff9a"><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="#a32e946a3adff29e77fc82e7251e2ff9a">More...</a><br /></td></tr>
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<tr class="separator:a32e946a3adff29e77fc82e7251e2ff9a"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a2bb2dbc3eec8af82a1b226d5b39a39c0"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounterDD.html#a2bb2dbc3eec8af82a1b226d5b39a39c0">isPointInPolygon</a> ()</td></tr>
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<tr class="memdesc:a2bb2dbc3eec8af82a1b226d5b39a39c0"><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="#a2bb2dbc3eec8af82a1b226d5b39a39c0">More...</a><br /></td></tr>
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<tr class="separator:a2bb2dbc3eec8af82a1b226d5b39a39c0"><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:a8a7e4bdb2c7f0404bb3704fddf73446a"><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_1RayCrossingCounterDD.html#a8a7e4bdb2c7f0404bb3704fddf73446a">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:a8a7e4bdb2c7f0404bb3704fddf73446a"><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. This method is an exemplar of how to use this class. <a href="#a8a7e4bdb2c7f0404bb3704fddf73446a">More...</a><br /></td></tr>
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<tr class="separator:a8a7e4bdb2c7f0404bb3704fddf73446a"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a10ddc0fcfa241232ad7ffadb4d7e3666"><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_1RayCrossingCounterDD.html#a10ddc0fcfa241232ad7ffadb4d7e3666">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:a10ddc0fcfa241232ad7ffadb4d7e3666"><td class="mdescLeft"> </td><td class="mdescRight">Semantically equal to the above, just different args encoding. <a href="#a10ddc0fcfa241232ad7ffadb4d7e3666">More...</a><br /></td></tr>
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<tr class="separator:a10ddc0fcfa241232ad7ffadb4d7e3666"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a98a1bdae61284143d206bec140b8a69d"><td class="memItemLeft" align="right" valign="top">static int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounterDD.html#a98a1bdae61284143d206bec140b8a69d">orientationIndex</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, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &q)</td></tr>
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<tr class="memdesc:a98a1bdae61284143d206bec140b8a69d"><td class="mdescLeft"> </td><td class="mdescRight">Returns the index of the direction of the point <code>q</code> relative to a vector specified by <code>p1-p2</code>. <a href="#a98a1bdae61284143d206bec140b8a69d">More...</a><br /></td></tr>
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<tr class="separator:a98a1bdae61284143d206bec140b8a69d"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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Private Member Functions</h2></td></tr>
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<tr class="memitem:a585c6ddaedc94f5a3e159a4cfab06b60"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounterDD.html#a585c6ddaedc94f5a3e159a4cfab06b60">RayCrossingCounterDD</a> (const <a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounterDD.html">RayCrossingCounterDD</a> &other)=delete</td></tr>
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<tr class="memitem:a520e3e4e11997b366c06777579564a77"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounterDD.html">RayCrossingCounterDD</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounterDD.html#a520e3e4e11997b366c06777579564a77">operator=</a> (const <a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounterDD.html">RayCrossingCounterDD</a> &rhs)=delete</td></tr>
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Private Attributes</h2></td></tr>
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<tr class="memitem:a1aa2b15f5253c95ee126d79d3a5681db"><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_1RayCrossingCounterDD.html#a1aa2b15f5253c95ee126d79d3a5681db">point</a></td></tr>
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<tr class="memitem:aba8c74d2f578bf3d058a52e746d33af8"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounterDD.html#aba8c74d2f578bf3d058a52e746d33af8">crossingCount</a></td></tr>
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<tr class="memitem:af7707b3b63e04862a2c12befd9b81ccc"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounterDD.html#af7707b3b63e04862a2c12befd9b81ccc">isPointOnSegment</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>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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<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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<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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<p>Definition at line <a class="el" href="RayCrossingCounterDD_8h_source.html#l00064">64</a> of file <a class="el" href="RayCrossingCounterDD_8h_source.html">RayCrossingCounterDD.h</a>.</p>
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</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<td class="memname">geos::algorithm::RayCrossingCounterDD::RayCrossingCounterDD </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1algorithm_1_1RayCrossingCounterDD.html">RayCrossingCounterDD</a> & </td>
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<td class="memname">geos::algorithm::RayCrossingCounterDD::RayCrossingCounterDD </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>Definition at line <a class="el" href="RayCrossingCounterDD_8h_source.html#l00109">109</a> of file <a class="el" href="RayCrossingCounterDD_8h_source.html">RayCrossingCounterDD.h</a>.</p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">void geos::algorithm::RayCrossingCounterDD::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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<p>Counts a segment. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">p1</td><td>an 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::RayCrossingCounterDD::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::RayCrossingCounterDD::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="RayCrossingCounterDD_8h_source.html#l00134">134</a> of file <a class="el" href="RayCrossingCounterDD_8h_source.html">RayCrossingCounterDD.h</a>.</p>
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<td class="memname">bool geos::algorithm::RayCrossingCounterDD::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>true 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::RayCrossingCounterDD::locatePointInRing </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. 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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<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::RayCrossingCounterDD::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_1RayCrossingCounterDD.html">RayCrossingCounterDD</a>& geos::algorithm::RayCrossingCounterDD::operator= </td>
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<p>Returns the index of the direction of the point <code>q</code> relative to a vector specified by <code>p1-p2</code>. </p>
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<dl class="section return"><dt>Returns</dt><dd>1 if q is counter-clockwise (left) from p1-p2 </dd>
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<h2 class="groupheader">Member Data Documentation</h2>
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<p>Definition at line <a class="el" href="RayCrossingCounterDD_8h_source.html#l00068">68</a> of file <a class="el" href="RayCrossingCounterDD_8h_source.html">RayCrossingCounterDD.h</a>.</p>
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<p>Definition at line <a class="el" href="RayCrossingCounterDD_8h_source.html#l00071">71</a> of file <a class="el" href="RayCrossingCounterDD_8h_source.html">RayCrossingCounterDD.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::RayCrossingCounterDD::point</td>
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<p>Definition at line <a class="el" href="RayCrossingCounterDD_8h_source.html#l00066">66</a> of file <a class="el" href="RayCrossingCounterDD_8h_source.html">RayCrossingCounterDD.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="RayCrossingCounterDD_8h_source.html">RayCrossingCounterDD.h</a></li>
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