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/**********************************************************************
* $Id: CentroidPoint.cpp,v 1.7 2004/07/02 13:28:26 strk Exp $
*
* GEOS - Geometry Engine Open Source
* http://geos.refractions.net
*
* Copyright (C) 2001-2002 Vivid Solutions Inc.
*
* This is free software; you can redistribute and/or modify it under
* the terms of the GNU Lesser General Public Licence as published
* by the Free Software Foundation.
* See the COPYING file for more information.
*
**********************************************************************
* $Log: CentroidPoint.cpp,v $
* Revision 1.7 2004/07/02 13:28:26 strk
* Fixed all #include lines to reflect headers layout change.
* Added client application build tips in README.
*
* Revision 1.6 2003/11/07 01:23:42 pramsey
* Add standard CVS headers licence notices and copyrights to all cpp and h
* files.
*
*
**********************************************************************/
#include <geos/geosAlgorithm.h>
#include <geos/platform.h>
#include <typeinfo>
namespace geos {
CentroidPoint::CentroidPoint() {
ptCount=0;
centSum=new Coordinate();
}
CentroidPoint::~CentroidPoint() {
delete centSum;
}
/**
* Adds the point(s) defined by a Geometry to the centroid total.
* If the geometry is not of dimension 0 it does not contribute to the centroid.
* @param geom the geometry to add
*/
void CentroidPoint::add(const Geometry *geom) {
if (typeid(*geom)==typeid(Point)) {
add(geom->getCoordinate());
} else if ((typeid(*geom)==typeid(GeometryCollection)) ||
(typeid(*geom)==typeid(MultiPoint)) ||
(typeid(*geom)==typeid(MultiPolygon)) ||
(typeid(*geom)==typeid(MultiLineString))) {
GeometryCollection *gc=(GeometryCollection*) geom;
for(int i=0;i<gc->getNumGeometries();i++) {
add(gc->getGeometryN(i));
}
}
}
/**
* Adds the length defined by an array of coordinates.
* @param pts an array of {@link Coordinate}s
*/
void CentroidPoint::add(const Coordinate *pt) {
ptCount+=1;
centSum->x+=pt->x;
centSum->y+=pt->y;
}
Coordinate* CentroidPoint::getCentroid() const {
return new Coordinate(centSum->x/ptCount,centSum->y/ptCount);
}
}
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