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MinimumDiameter.h

00001 /**********************************************************************
00002  * $Id: MinimumDiameter.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_MINIMUMDIAMETER_H
00018 #define GEOS_ALGORITHM_MINIMUMDIAMETER_H
00019 
00020 #include <geos/export.h>
00021 
00022 // Forward declarations
00023 namespace geos {
00024         namespace geom {
00025                 class Geometry;
00026                 class LineSegment;
00027                 class LineString;
00028                 class Coordinate;
00029                 class CoordinateSequence;
00030         }
00031 }
00032 
00033 
00034 namespace geos {
00035 namespace algorithm { // geos::algorithm
00036 
00055 class GEOS_DLL MinimumDiameter {
00056 private:
00057         const geom::Geometry* inputGeom;
00058         bool isConvex;
00059         geom::LineSegment* minBaseSeg;
00060         geom::Coordinate* minWidthPt;
00061         int minPtIndex;
00062         double minWidth;
00063         void computeMinimumDiameter();
00064         void computeWidthConvex(const geom::Geometry* geom);
00065 
00073         void computeConvexRingMinDiameter(const geom::CoordinateSequence *pts);
00074 
00075         unsigned int findMaxPerpDistance(const geom::CoordinateSequence* pts,
00076                 geom::LineSegment* seg, unsigned int startIndex);
00077 
00078         static unsigned int getNextIndex(const geom::CoordinateSequence* pts,
00079                 unsigned int index);
00080 
00081 public:
00082         ~MinimumDiameter();
00083 
00089         MinimumDiameter(const geom::Geometry* newInputGeom);
00090 
00100         MinimumDiameter(const geom::Geometry* newInputGeom,
00101                         const bool newIsConvex);
00102 
00108         double getLength();
00109 
00115         geom::Coordinate* getWidthCoordinate();
00116 
00122         geom::LineString* getSupportingSegment();
00123 
00129         geom::LineString* getDiameter();
00130 };
00131 
00132 } // namespace geos::algorithm
00133 } // namespace geos
00134 
00135 #endif // GEOS_ALGORITHM_MINIMUMDIAMETER_H
00136 
00137 /**********************************************************************
00138  * $Log$
00139  * Revision 1.1  2006/03/09 16:46:48  strk
00140  * geos::geom namespace definition, first pass at headers split
00141  *
00142  **********************************************************************/
00143 

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