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# MinimumDiameter.h

    00001 /**********************************************************************
    00002  * $Id: MinimumDiameter.h 1820 2006-09-06 16:54:23Z mloskot $
    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
    00021 // Forward declarations
    00022 namespace geos {
    00023         namespace geom {
    00024                 class Geometry;
    00025                 class LineSegment;
    00026                 class LineString;
    00027                 class Coordinate;
    00028                 class CoordinateSequence;
    00029         }
    00030 }
    00031
    00032
    00033 namespace geos {
    00034 namespace algorithm { // geos::algorithm
    00035
    00054 class MinimumDiameter {
    00055 private:
    00056         const geom::Geometry* inputGeom;
    00057         bool isConvex;
    00058         geom::LineSegment* minBaseSeg;
    00059         geom::Coordinate* minWidthPt;
    00060         int minPtIndex;
    00061         double minWidth;
    00062         void computeMinimumDiameter();
    00063         void computeWidthConvex(const geom::Geometry* geom);
    00064
    00072         void computeConvexRingMinDiameter(const geom::CoordinateSequence *pts);
    00073
    00074         unsigned int findMaxPerpDistance(const geom::CoordinateSequence* pts,
    00075                 geom::LineSegment* seg, unsigned int startIndex);
    00076
    00077         static unsigned int getNextIndex(const geom::CoordinateSequence* pts,
    00078                 unsigned int index);
    00079
    00080 public:
    00081         ~MinimumDiameter();
    00082
    00088         MinimumDiameter(const geom::Geometry* newInputGeom);
    00089
    00099         MinimumDiameter(const geom::Geometry* newInputGeom,
    00100                         const bool newIsConvex);
    00101
    00107         double getLength();
    00108
    00114         geom::Coordinate* getWidthCoordinate();
    00115
    00121         geom::LineString* getSupportingSegment();
    00122
    00128         geom::LineString* getDiameter();
    00129 };
    00130
    00131 } // namespace geos::algorithm
    00132 } // namespace geos
    00133
    00134 #endif // GEOS_ALGORITHM_MINIMUMDIAMETER_H
    00135
    00136 /**********************************************************************
    00137  * $Log$
    00138  * Revision 1.1  2006/03/09 16:46:48  strk
    00139  * geos::geom namespace definition, first pass at headers split
    00140  *
    00141  **********************************************************************/
    00142