796 lines
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796 lines
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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_1MinimumDiameter.html">MinimumDiameter</a></li> </ul>
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<div class="title">geos::algorithm::MinimumDiameter Class Reference</div> </div>
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<p>Computes the minimum diameter of a <a class="el" href="classgeos_1_1geom_1_1Geometry.html" title="Basic implementation of Geometry, constructed and destructed by GeometryFactory. ">geom::Geometry</a>.
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<a href="classgeos_1_1algorithm_1_1MinimumDiameter.html#details">More...</a></p>
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<p><code>#include <<a class="el" href="MinimumDiameter_8h_source.html">MinimumDiameter.h</a>></code></p>
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Collaboration diagram for geos::algorithm::MinimumDiameter:</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:afa3b3df034fc3e72c48e09ae9f882c3d"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#afa3b3df034fc3e72c48e09ae9f882c3d">~MinimumDiameter</a> ()=default</td></tr>
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<tr class="separator:afa3b3df034fc3e72c48e09ae9f882c3d"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ab3986f0716ce07de04dbd988c16db4b3"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#ab3986f0716ce07de04dbd988c16db4b3">MinimumDiameter</a> (const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> *newInputGeom)</td></tr>
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<tr class="memdesc:ab3986f0716ce07de04dbd988c16db4b3"><td class="mdescLeft"> </td><td class="mdescRight">Compute a minimum diameter for a given <a class="el" href="classgeos_1_1geom_1_1Geometry.html">Geometry</a>. <a href="#ab3986f0716ce07de04dbd988c16db4b3">More...</a><br /></td></tr>
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<tr class="separator:ab3986f0716ce07de04dbd988c16db4b3"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:add67a087e3ee67750f08b26eef52bd6e"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#add67a087e3ee67750f08b26eef52bd6e">MinimumDiameter</a> (const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> *newInputGeom, const bool newIsConvex)</td></tr>
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<tr class="memdesc:add67a087e3ee67750f08b26eef52bd6e"><td class="mdescLeft"> </td><td class="mdescRight">Compute a minimum diameter for a given Geometry, with a hint if the Geometry is convex (e.g. a convex Polygon or LinearRing, or a two-point LineString, or a Point). <a href="#add67a087e3ee67750f08b26eef52bd6e">More...</a><br /></td></tr>
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<tr class="separator:add67a087e3ee67750f08b26eef52bd6e"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a8761c629d0aee8f0c45f587ca0898ea3"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#a8761c629d0aee8f0c45f587ca0898ea3">getLength</a> ()</td></tr>
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<tr class="memdesc:a8761c629d0aee8f0c45f587ca0898ea3"><td class="mdescLeft"> </td><td class="mdescRight">Gets the length of the minimum diameter of the input Geometry. <a href="#a8761c629d0aee8f0c45f587ca0898ea3">More...</a><br /></td></tr>
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<tr class="separator:a8761c629d0aee8f0c45f587ca0898ea3"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a16d50521cdbdb69d46d2979e60124b5d"><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_1MinimumDiameter.html#a16d50521cdbdb69d46d2979e60124b5d">getWidthCoordinate</a> ()</td></tr>
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<tr class="memdesc:a16d50521cdbdb69d46d2979e60124b5d"><td class="mdescLeft"> </td><td class="mdescRight">Gets the <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> forming one end of the minimum diameter. <a href="#a16d50521cdbdb69d46d2979e60124b5d">More...</a><br /></td></tr>
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<tr class="separator:a16d50521cdbdb69d46d2979e60124b5d"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a384340ccaff682c80653dcae651abffd"><td class="memItemLeft" align="right" valign="top">std::unique_ptr< <a class="el" href="classgeos_1_1geom_1_1LineString.html">geom::LineString</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#a384340ccaff682c80653dcae651abffd">getSupportingSegment</a> ()</td></tr>
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<tr class="memdesc:a384340ccaff682c80653dcae651abffd"><td class="mdescLeft"> </td><td class="mdescRight">Gets the segment forming the base of the minimum diameter. <a href="#a384340ccaff682c80653dcae651abffd">More...</a><br /></td></tr>
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<tr class="separator:a384340ccaff682c80653dcae651abffd"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ae9de89b6811dc28471d6a7886748f621"><td class="memItemLeft" align="right" valign="top">std::unique_ptr< <a class="el" href="classgeos_1_1geom_1_1LineString.html">geom::LineString</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#ae9de89b6811dc28471d6a7886748f621">getDiameter</a> ()</td></tr>
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<tr class="memdesc:ae9de89b6811dc28471d6a7886748f621"><td class="mdescLeft"> </td><td class="mdescRight">Gets a LineString which is a minimum diameter. <a href="#ae9de89b6811dc28471d6a7886748f621">More...</a><br /></td></tr>
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<tr class="separator:ae9de89b6811dc28471d6a7886748f621"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a503cb5f3281902beafd2561dd83c2c78"><td class="memItemLeft" align="right" valign="top">std::unique_ptr< <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#a503cb5f3281902beafd2561dd83c2c78">getMinimumRectangle</a> ()</td></tr>
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<tr class="memdesc:a503cb5f3281902beafd2561dd83c2c78"><td class="mdescLeft"> </td><td class="mdescRight">Gets the minimum rectangular Polygon which encloses the input geometry. <a href="#a503cb5f3281902beafd2561dd83c2c78">More...</a><br /></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:a5cc466adaf96af9ef703b1b1ba8f0ade"><td class="memItemLeft" align="right" valign="top">static std::unique_ptr< <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#a5cc466adaf96af9ef703b1b1ba8f0ade">getMinimumRectangle</a> (<a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> *geom)</td></tr>
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<tr class="memdesc:a5cc466adaf96af9ef703b1b1ba8f0ade"><td class="mdescLeft"> </td><td class="mdescRight">Gets the minimum rectangle enclosing a geometry. <a href="#a5cc466adaf96af9ef703b1b1ba8f0ade">More...</a><br /></td></tr>
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<tr class="separator:a5cc466adaf96af9ef703b1b1ba8f0ade"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a69928d5be1428f58731078dd59b1b7a1"><td class="memItemLeft" align="right" valign="top">static std::unique_ptr< <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#a69928d5be1428f58731078dd59b1b7a1">getMinimumDiameter</a> (<a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> *geom)</td></tr>
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<tr class="memdesc:a69928d5be1428f58731078dd59b1b7a1"><td class="mdescLeft"> </td><td class="mdescRight">Gets the length of the minimum diameter enclosing a geometry. <a href="#a69928d5be1428f58731078dd59b1b7a1">More...</a><br /></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:a6b989d1cffcc53a85147a2a37b9e897e"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#a6b989d1cffcc53a85147a2a37b9e897e">computeMinimumDiameter</a> ()</td></tr>
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<tr class="memitem:a2689964d8d5ab77d6aaeed8c0c0373ad"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#a2689964d8d5ab77d6aaeed8c0c0373ad">computeWidthConvex</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:a48da750b81ec7c2ed89cf5abb75c0820"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#a48da750b81ec7c2ed89cf5abb75c0820">computeConvexRingMinDiameter</a> (const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> *pts)</td></tr>
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<tr class="memitem:ac50bef9b2a054c6e89edaea2fcf23c5b"><td class="memItemLeft" align="right" valign="top">unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#ac50bef9b2a054c6e89edaea2fcf23c5b">findMaxPerpDistance</a> (const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> *pts, const <a class="el" href="classgeos_1_1geom_1_1LineSegment.html">geom::LineSegment</a> *seg, unsigned int startIndex)</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-static-methods"></a>
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Static Private Member Functions</h2></td></tr>
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<tr class="memitem:adfd8130241515cfd1c053b25dfe91558"><td class="memItemLeft" align="right" valign="top">static unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#adfd8130241515cfd1c053b25dfe91558">getNextIndex</a> (const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> *pts, unsigned int index)</td></tr>
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<tr class="memitem:a7a7978709b53684d939280b5b6969af9"><td class="memItemLeft" align="right" valign="top">static double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#a7a7978709b53684d939280b5b6969af9">computeC</a> (double a, double b, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p)</td></tr>
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<tr class="memitem:a3f9886ec2812644a5f72aab632c13853"><td class="memItemLeft" align="right" valign="top">static <a class="el" href="classgeos_1_1geom_1_1LineSegment.html">geom::LineSegment</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#a3f9886ec2812644a5f72aab632c13853">computeSegmentForLine</a> (double a, double b, double c)</td></tr>
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Private Attributes</h2></td></tr>
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<tr class="memitem:ae8402e87a00a3b9ded585a3b49493932"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#ae8402e87a00a3b9ded585a3b49493932">inputGeom</a></td></tr>
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<tr class="memitem:a51d8fc7fd976b8e7be902ba1a59ab032"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#a51d8fc7fd976b8e7be902ba1a59ab032">isConvex</a></td></tr>
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<tr class="memitem:a5c6beef02f3a59549a517e6d236aa041"><td class="memItemLeft" align="right" valign="top">std::unique_ptr< <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#a5c6beef02f3a59549a517e6d236aa041">convexHullPts</a></td></tr>
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<tr class="memitem:a80f13938f12d0c94fbfebd791bf569fd"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classgeos_1_1geom_1_1LineSegment.html">geom::LineSegment</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#a80f13938f12d0c94fbfebd791bf569fd">minBaseSeg</a></td></tr>
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<tr class="memitem:aeb38c30c98bbb8c6212e680e2a00e52e"><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_1MinimumDiameter.html#aeb38c30c98bbb8c6212e680e2a00e52e">minWidthPt</a></td></tr>
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<tr class="memitem:a9b7500666f38e22957c4a808e8d3a46f"><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#a9b7500666f38e22957c4a808e8d3a46f">minPtIndex</a></td></tr>
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<tr class="memitem:a0fa35c41bc81ca2d0d4b51ce22a6e93f"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1MinimumDiameter.html#a0fa35c41bc81ca2d0d4b51ce22a6e93f">minWidth</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 the minimum diameter of a <a class="el" href="classgeos_1_1geom_1_1Geometry.html" title="Basic implementation of Geometry, constructed and destructed by GeometryFactory. ">geom::Geometry</a>. </p>
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<p>The minimum diameter is defined to be the width of the smallest band that contains the geometry, where a band is a strip of the plane defined by two parallel lines. This can be thought of as the smallest hole that the geometry can be moved through, with a single rotation.</p>
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<p>The first step in the algorithm is computing the convex hull of the Geometry. If the input Geometry is known to be convex, a hint can be supplied to avoid this computation.</p>
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<p>This class can also be used to compute a line segment representing the minimum diameter, the supporting line segment of the minimum diameter, and a minimum rectangle enclosing the input geometry. This rectangle will have width equal to the minimum diameter, and have one side parallel to the supporting segment.</p>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="classgeos_1_1algorithm_1_1ConvexHull.html" title="Computes the convex hull of a Geometry. ">ConvexHull</a> </dd></dl>
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<p>Definition at line <a class="el" href="MinimumDiameter_8h_source.html#l00063">63</a> of file <a class="el" href="MinimumDiameter_8h_source.html">MinimumDiameter.h</a>.</p>
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</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<td class="memname">geos::algorithm::MinimumDiameter::MinimumDiameter </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> * </td>
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<p>Compute a minimum diameter for a given <a class="el" href="classgeos_1_1geom_1_1Geometry.html">Geometry</a>. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> * </td>
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<p>Compute a minimum diameter for a given Geometry, with a hint if the Geometry is convex (e.g. a convex Polygon or LinearRing, or a two-point LineString, or a Point). </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">newInputGeom</td><td>a Geometry which is convex </td></tr>
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<h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">void geos::algorithm::MinimumDiameter::computeConvexRingMinDiameter </td>
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<p>Compute the width information for a ring of <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a>s. Leaves the width information in the instance variables.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<td class="memname">void geos::algorithm::MinimumDiameter::computeMinimumDiameter </td>
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<td class="memname">void geos::algorithm::MinimumDiameter::computeWidthConvex </td>
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<p>Gets a LineString which is a minimum diameter. </p>
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<p>Gets the length of the minimum diameter of the input Geometry. </p>
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<dl class="section return"><dt>Returns</dt><dd>the length of the minimum diameter </dd></dl>
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<p>Gets the length of the minimum diameter enclosing a geometry. </p>
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<p>Gets the minimum rectangular Polygon which encloses the input geometry. </p>
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<p>The rectangle has width equal to the minimum diameter, and a longer length. If the convex hill of the input is degenerate (a line or point) a LineString or Point is returned. The minimum rectangle can be used as an extremely generalized representation for the given geometry.</p>
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<dl class="section return"><dt>Returns</dt><dd>the minimum rectangle enclosing the input (or a line or point if degenerate) </dd></dl>
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<p>Gets the minimum rectangle enclosing a geometry. </p>
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<td class="paramname"><em>index</em> </td>
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<td class="memname">std::unique_ptr<<a class="el" href="classgeos_1_1geom_1_1LineString.html">geom::LineString</a>> geos::algorithm::MinimumDiameter::getSupportingSegment </td>
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<p>Gets the segment forming the base of the minimum diameter. </p>
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<dl class="section return"><dt>Returns</dt><dd>the segment forming the base of the minimum diameter </dd></dl>
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<td class="memname">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a>& geos::algorithm::MinimumDiameter::getWidthCoordinate </td>
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<p>Gets the <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> forming one end of the minimum diameter. </p>
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<dl class="section return"><dt>Returns</dt><dd>a coordinate forming one end of the minimum diameter </dd></dl>
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<h2 class="groupheader">Member Data Documentation</h2>
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<td class="memname">std::unique_ptr<<a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a>> geos::algorithm::MinimumDiameter::convexHullPts</td>
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<p>Definition at line <a class="el" href="MinimumDiameter_8h_source.html#l00068">68</a> of file <a class="el" href="MinimumDiameter_8h_source.html">MinimumDiameter.h</a>.</p>
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<td class="memname">const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a>* geos::algorithm::MinimumDiameter::inputGeom</td>
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<p>Definition at line <a class="el" href="MinimumDiameter_8h_source.html#l00065">65</a> of file <a class="el" href="MinimumDiameter_8h_source.html">MinimumDiameter.h</a>.</p>
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<p>Definition at line <a class="el" href="MinimumDiameter_8h_source.html#l00066">66</a> of file <a class="el" href="MinimumDiameter_8h_source.html">MinimumDiameter.h</a>.</p>
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<td class="memname"><a class="el" href="classgeos_1_1geom_1_1LineSegment.html">geom::LineSegment</a> geos::algorithm::MinimumDiameter::minBaseSeg</td>
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<p>Definition at line <a class="el" href="MinimumDiameter_8h_source.html#l00070">70</a> of file <a class="el" href="MinimumDiameter_8h_source.html">MinimumDiameter.h</a>.</p>
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<td class="memname">size_t geos::algorithm::MinimumDiameter::minPtIndex</td>
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<p>Definition at line <a class="el" href="MinimumDiameter_8h_source.html#l00072">72</a> of file <a class="el" href="MinimumDiameter_8h_source.html">MinimumDiameter.h</a>.</p>
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<td class="memname">double geos::algorithm::MinimumDiameter::minWidth</td>
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<p>Definition at line <a class="el" href="MinimumDiameter_8h_source.html#l00073">73</a> of file <a class="el" href="MinimumDiameter_8h_source.html">MinimumDiameter.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::MinimumDiameter::minWidthPt</td>
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<p>Definition at line <a class="el" href="MinimumDiameter_8h_source.html#l00071">71</a> of file <a class="el" href="MinimumDiameter_8h_source.html">MinimumDiameter.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="MinimumDiameter_8h_source.html">MinimumDiameter.h</a></li>
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