757 lines
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757 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_1Centroid.html">Centroid</a></li> </ul>
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<a href="#pub-methods">Public Member Functions</a> |
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<a href="#pub-static-methods">Static Public Member Functions</a> |
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<a href="#pri-methods">Private Member Functions</a> |
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<div class="title">geos::algorithm::Centroid Class Reference</div> </div>
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<p>Computes the centroid of a <a class="el" href="classgeos_1_1geom_1_1Geometry.html">Geometry</a> of any dimension.
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<a href="classgeos_1_1algorithm_1_1Centroid.html#details">More...</a></p>
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<p><code>#include <<a class="el" href="Centroid_8h_source.html">Centroid.h</a>></code></p>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:a004060aaa21454f3dfc50cd859e78b16"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1Centroid.html#a004060aaa21454f3dfc50cd859e78b16">Centroid</a> (const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> &geom)</td></tr>
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<tr class="memdesc:a004060aaa21454f3dfc50cd859e78b16"><td class="mdescLeft"> </td><td class="mdescRight">Creates a new instance for computing the centroid of a geometry. <a href="#a004060aaa21454f3dfc50cd859e78b16">More...</a><br /></td></tr>
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<tr class="separator:a004060aaa21454f3dfc50cd859e78b16"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aa5fbc3111811a4de330abb141f4972d3"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1Centroid.html#aa5fbc3111811a4de330abb141f4972d3">getCentroid</a> (<a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &cent) const </td></tr>
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<tr class="memdesc:aa5fbc3111811a4de330abb141f4972d3"><td class="mdescLeft"> </td><td class="mdescRight">Gets the computed centroid. <a href="#aa5fbc3111811a4de330abb141f4972d3">More...</a><br /></td></tr>
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<tr class="separator:aa5fbc3111811a4de330abb141f4972d3"><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:a98fc3729507b19fd5b6617f3ca8a5f8e"><td class="memItemLeft" align="right" valign="top">static bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1Centroid.html#a98fc3729507b19fd5b6617f3ca8a5f8e">getCentroid</a> (const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> &geom, <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &cent)</td></tr>
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<tr class="memdesc:a98fc3729507b19fd5b6617f3ca8a5f8e"><td class="mdescLeft"> </td><td class="mdescRight">Computes the centroid point of a geometry. <a href="#a98fc3729507b19fd5b6617f3ca8a5f8e">More...</a><br /></td></tr>
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<tr class="separator:a98fc3729507b19fd5b6617f3ca8a5f8e"><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:a984f4fd002ed21bf4e82b8d907a9ead8"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1Centroid.html#a984f4fd002ed21bf4e82b8d907a9ead8">add</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:afa19510be15158bee8f93619336dd3da"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1Centroid.html#afa19510be15158bee8f93619336dd3da">setAreaBasePoint</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &basePt)</td></tr>
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<tr class="separator:afa19510be15158bee8f93619336dd3da"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aabb4af85e80a970529caf7cbd654c8e4"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1Centroid.html#aabb4af85e80a970529caf7cbd654c8e4">add</a> (const <a class="el" href="classgeos_1_1geom_1_1Polygon.html">geom::Polygon</a> &poly)</td></tr>
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<tr class="memitem:a96d215b1749f345c716d22d0e9f46ac7"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1Centroid.html#a96d215b1749f345c716d22d0e9f46ac7">addShell</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:af8c1b0bbb0b04dce8e83d2d8ffcac35b"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1Centroid.html#af8c1b0bbb0b04dce8e83d2d8ffcac35b">addHole</a> (const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> &pts)</td></tr>
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<tr class="separator:af8c1b0bbb0b04dce8e83d2d8ffcac35b"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a5c30e22bb35f53de7e63b3b8d666261e"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1Centroid.html#a5c30e22bb35f53de7e63b3b8d666261e">addTriangle</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p0, 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, bool isPositiveArea)</td></tr>
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<tr class="separator:a5c30e22bb35f53de7e63b3b8d666261e"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a40b58e18a7672ea2cd6d93f02c4f26a5"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1Centroid.html#a40b58e18a7672ea2cd6d93f02c4f26a5">addLineSegments</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:a51d463fce0fce5196b545ef171f3e3b0"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1Centroid.html#a51d463fce0fce5196b545ef171f3e3b0">addPoint</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &pt)</td></tr>
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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:a00e93348b39d426e18dd0b9b37505155"><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1Centroid.html#a00e93348b39d426e18dd0b9b37505155">centroid3</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> &p3, <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &c)</td></tr>
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<tr class="memitem:a73844e978ef37954f0e126fe5739e05a"><td class="memItemLeft" align="right" valign="top">static double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1Centroid.html#a73844e978ef37954f0e126fe5739e05a">area2</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> &p3)</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-attribs"></a>
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Private Attributes</h2></td></tr>
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<tr class="memitem:a288c5d7a0daf8e599b9f95fbcfc9fce5"><td class="memItemLeft" align="right" valign="top">std::unique_ptr< <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_1Centroid.html#a288c5d7a0daf8e599b9f95fbcfc9fce5">areaBasePt</a></td></tr>
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<tr class="separator:a288c5d7a0daf8e599b9f95fbcfc9fce5"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a2af51982d521a3775f3ca9c2b263eaea"><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_1Centroid.html#a2af51982d521a3775f3ca9c2b263eaea">triangleCent3</a></td></tr>
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<tr class="separator:a2af51982d521a3775f3ca9c2b263eaea"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aef256a4f2184a44809db3d8ddb3f79de"><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_1Centroid.html#aef256a4f2184a44809db3d8ddb3f79de">cg3</a></td></tr>
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<tr class="separator:aef256a4f2184a44809db3d8ddb3f79de"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a16af303b7f76b2f732e09eb3cbb80152"><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_1Centroid.html#a16af303b7f76b2f732e09eb3cbb80152">lineCentSum</a></td></tr>
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<tr class="separator:a16af303b7f76b2f732e09eb3cbb80152"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a4f98b633fdda1e829ab5f2b8316a7339"><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_1Centroid.html#a4f98b633fdda1e829ab5f2b8316a7339">ptCentSum</a></td></tr>
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<tr class="separator:a4f98b633fdda1e829ab5f2b8316a7339"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a4e8ba6c730aed0b4fd88e97857046ebc"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1Centroid.html#a4e8ba6c730aed0b4fd88e97857046ebc">areasum2</a></td></tr>
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<tr class="memitem:a33d6ed4f752f5061eab08ffd94448c36"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1Centroid.html#a33d6ed4f752f5061eab08ffd94448c36">totalLength</a></td></tr>
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<tr class="memitem:ada1341dc956f040facb809ca89e73a74"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1Centroid.html#ada1341dc956f040facb809ca89e73a74">ptCount</a></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>Computes the centroid of a <a class="el" href="classgeos_1_1geom_1_1Geometry.html">Geometry</a> of any dimension. </p>
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<p>If the geometry is nomimally of higher dimension, but contains only components having a lower effective dimension (i.e. zero length or area), the centroid will be computed appropriately.</p>
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<h3>Algorithm</h3>
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<ul>
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<li><b>Dimension = 2</b> - Based on the usual algorithm for calculating the centroid as a weighted sum of the centroids of a decomposition of the area into (possibly overlapping) triangles. The algorithm has been extended to handle holes and multi-polygons. See <a href="http://www.faqs.org/faqs/graphics/algorithms-faq/">http://www.faqs.org/faqs/graphics/algorithms-faq/</a> for further details of the basic approach.</li>
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<li><b>Dimension = 1</b> - Computes the average of the midpoints of all line segments weighted by the segment length.</li>
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<li><b>Dimension = 0</b> - Compute the average coordinate over all points.</li>
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</ul>
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<p>If the input geometries are empty, a <code>null</code> Coordinate is returned. </p>
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<p>Definition at line <a class="el" href="Centroid_8h_source.html#l00061">61</a> of file <a class="el" href="Centroid_8h_source.html">Centroid.h</a>.</p>
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</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<a class="anchor" id="a004060aaa21454f3dfc50cd859e78b16"></a>
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<td class="memname">geos::algorithm::Centroid::Centroid </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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<td class="paramname"><em>geom</em></td><td>)</td>
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<p>Creates a new instance for computing the centroid of a geometry. </p>
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<p>Definition at line <a class="el" href="Centroid_8h_source.html#l00079">79</a> of file <a class="el" href="Centroid_8h_source.html">Centroid.h</a>.</p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">void geos::algorithm::Centroid::add </td>
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<p>Adds a Geometry to the centroid total.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">geom</td><td>the geometry to add </td></tr>
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<td class="memname">void geos::algorithm::Centroid::add </td>
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<td class="memname">void geos::algorithm::Centroid::addHole </td>
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<td class="memname">void geos::algorithm::Centroid::addLineSegments </td>
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<p>Adds the line segments defined by an array of coordinates to the linear centroid accumulators.</p>
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<td class="memname">void geos::algorithm::Centroid::addPoint </td>
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<p>Adds a point to the point centroid accumulator. </p><dl class="params"><dt>Parameters</dt><dd>
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<td class="memname">void geos::algorithm::Centroid::addShell </td>
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<td class="memname">void geos::algorithm::Centroid::addTriangle </td>
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<td class="memname">static double geos::algorithm::Centroid::area2 </td>
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<p>Returns twice the signed area of the triangle p1-p2-p3. The area is positive if the triangle is oriented CCW, and negative if CW. </p>
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<td class="memname">static void geos::algorithm::Centroid::centroid3 </td>
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<p>Computes three times the centroid of the triangle p1-p2-p3. The factor of 3 is left in to permit division to be avoided until later. </p>
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<p>Computes the centroid point of a geometry. </p>
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<dl class="section return"><dt>Returns</dt><dd><code>true</code> if a centroid could be computed, <code>false</code> otherwise (empty geom) </dd></dl>
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<td class="memname">bool geos::algorithm::Centroid::getCentroid </td>
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<p>Gets the computed centroid. </p>
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<dl class="section return"><dt>Returns</dt><dd><code>true</code> if a centroid could be computed, <code>false</code> otherwise (empty geom) </dd></dl>
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<td class="memname">void geos::algorithm::Centroid::setAreaBasePoint </td>
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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_1Coordinate.html">geom::Coordinate</a>> geos::algorithm::Centroid::areaBasePt</td>
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<p>Definition at line <a class="el" href="Centroid_8h_source.html#l00100">100</a> of file <a class="el" href="Centroid_8h_source.html">Centroid.h</a>.</p>
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<td class="memname">double geos::algorithm::Centroid::areasum2</td>
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<p>Definition at line <a class="el" href="Centroid_8h_source.html#l00105">105</a> of file <a class="el" href="Centroid_8h_source.html">Centroid.h</a>.</p>
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<p>Definition at line <a class="el" href="Centroid_8h_source.html#l00102">102</a> of file <a class="el" href="Centroid_8h_source.html">Centroid.h</a>.</p>
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<p>Definition at line <a class="el" href="Centroid_8h_source.html#l00103">103</a> of file <a class="el" href="Centroid_8h_source.html">Centroid.h</a>.</p>
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<p>Definition at line <a class="el" href="Centroid_8h_source.html#l00104">104</a> of file <a class="el" href="Centroid_8h_source.html">Centroid.h</a>.</p>
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<p>Definition at line <a class="el" href="Centroid_8h_source.html#l00107">107</a> of file <a class="el" href="Centroid_8h_source.html">Centroid.h</a>.</p>
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<td class="memname">double geos::algorithm::Centroid::totalLength</td>
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<p>Definition at line <a class="el" href="Centroid_8h_source.html#l00106">106</a> of file <a class="el" href="Centroid_8h_source.html">Centroid.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::Centroid::triangleCent3</td>
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<p>Definition at line <a class="el" href="Centroid_8h_source.html#l00101">101</a> of file <a class="el" href="Centroid_8h_source.html">Centroid.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="Centroid_8h_source.html">Centroid.h</a></li>
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