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/**********************************************************************
* $Id: CentroidLine.cpp 1986 2007-06-08 15:27:42Z mloskot $
*
* GEOS - Geometry Engine Open Source
* http://geos.refractions.net
*
* Copyright (C) 2001-2002 Vivid Solutions Inc.
* Copyright (C) 2005 Refractions Research 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.
*
**********************************************************************
*
**********************************************************************/
#include <geos/algorithm/CentroidLine.h>
#include <geos/geom/Coordinate.h>
#include <geos/geom/CoordinateSequence.h>
#include <geos/geom/Geometry.h>
#include <geos/geom/GeometryCollection.h>
#include <geos/geom/LineString.h>
#include <typeinfo>
using namespace geos::geom;
namespace geos {
namespace algorithm { // geos.algorithm
/*public*/
void
CentroidLine::add(const Geometry *geom)
{
const LineString* ls = dynamic_cast<const LineString*>(geom);
if ( ls )
{
add(ls->getCoordinatesRO());
return;
}
const GeometryCollection* gc = dynamic_cast<const GeometryCollection*>(geom);
if (gc)
{
for(std::size_t i=0, n=gc->getNumGeometries(); i<n; i++) {
add(gc->getGeometryN(i));
}
}
}
/*public*/
void
CentroidLine::add(const CoordinateSequence *pts)
{
std::size_t const npts=pts->getSize();
for(std::size_t i=1; i<npts; ++i)
{
const Coordinate &p1=pts->getAt(i-1);
const Coordinate &p2=pts->getAt(i);
double segmentLen=p1.distance(p2);
totalLength+=segmentLen;
double midx=(p1.x+p2.x)/2;
centSum.x+=segmentLen*midx;
double midy=(p1.y+p2.y)/2;
centSum.y+=segmentLen*midy;
}
}
Coordinate *
CentroidLine::getCentroid() const
{
return new Coordinate(centSum.x/totalLength, centSum.y/totalLength);
}
bool
CentroidLine::getCentroid(Coordinate& c) const
{
if ( totalLength == 0.0 ) return false;
c=Coordinate(centSum.x/totalLength, centSum.y/totalLength);
return true;
}
} // namespace geos.algorithm
} // namespace geos
/**********************************************************************
* $Log$
* Revision 1.16 2006/03/21 11:12:23 strk
* Cleanups: headers inclusion and Log section
*
* Revision 1.15 2006/03/09 16:46:45 strk
* geos::geom namespace definition, first pass at headers split
*
**********************************************************************/
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