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CentroidArea.h

00001 /**********************************************************************
00002  * $Id: CentroidArea.h 2556 2009-06-06 22:22:28Z strk $
00003  *
00004  * GEOS - Geometry Engine Open Source
00005  * http://geos.refractions.net
00006  *
00007  * Copyright (C) 2005-2006 Refractions Research Inc.
00008  * Copyright (C) 2001-2002 Vivid Solutions Inc.
00009  *
00010  * This is free software; you can redistribute and/or modify it under
00011  * the terms of the GNU Lesser General Public Licence as published
00012  * by the Free Software Foundation. 
00013  * See the COPYING file for more information.
00014  *
00015  **********************************************************************/
00016 
00017 #ifndef GEOS_ALGORITHM_CENTROIDAREA_H
00018 #define GEOS_ALGORITHM_CENTROIDAREA_H
00019 
00020 
00021 #include <geos/export.h>
00022 #include <geos/geom/Coordinate.h>
00023 
00024 // Forward declarations
00025 namespace geos {
00026         namespace geom {
00027                 class CoordinateSequence;
00028                 class Geometry;
00029                 class Polygon;
00030         }
00031 }
00032 
00033 namespace geos {
00034 namespace algorithm { // geos::algorithm
00035 
00050 class GEOS_DLL CentroidArea {
00051 
00052 public:
00053 
00054         CentroidArea()
00055                 :
00056                 basePt(0.0, 0.0),
00057                 areasum2(0)
00058         {}
00059 
00060         ~CentroidArea() {}
00061 
00068         void add(const geom::Geometry *geom);
00069 
00076         void add(const geom::CoordinateSequence *ring);
00077 
00078         geom::Coordinate* getCentroid() const;
00079 
00081         bool getCentroid(geom::Coordinate& ret) const;
00082 
00083 private:
00084 
00086         geom::Coordinate basePt;
00087 
00088         // temporary variable to hold centroid of triangle
00089         geom::Coordinate triangleCent3;
00090 
00092         double areasum2;       
00093 
00095         geom::Coordinate cg3;
00096 
00097         void setBasePoint(const geom::Coordinate &newbasePt);
00098 
00099         void add(const geom::Polygon *poly);
00100 
00101         void addShell(const geom::CoordinateSequence *pts);
00102 
00103         void addHole(const geom::CoordinateSequence *pts);
00104         
00105         void addTriangle(const geom::Coordinate &p0, const geom::Coordinate &p1,
00106                         const geom::Coordinate &p2,bool isPositiveArea);
00107 
00108         static void centroid3(const geom::Coordinate &p1, const geom::Coordinate &p2,
00109                         const geom::Coordinate &p3, geom::Coordinate &c);
00110 
00111         static double area2(const geom::Coordinate &p1, const geom::Coordinate &p2,
00112                         const geom::Coordinate &p3);
00113 
00114 };
00115 
00116 } // namespace geos::algorithm
00117 } // namespace geos
00118 
00119 
00120 #endif // GEOS_ALGORITHM_CENTROIDAREA_H
00121 
00122 /**********************************************************************
00123  * $Log$
00124  * Revision 1.1  2006/03/09 16:46:48  strk
00125  * geos::geom namespace definition, first pass at headers split
00126  *
00127  **********************************************************************/
00128 

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