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/**********************************************************************
* $Id: ElevationMatrixFilter.cpp,v 1.3 2004/11/29 16:05:33 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.
*
**********************************************************************/
#include <geos/geom.h>
#include <geos/opOverlay.h>
#define DEBUG 0
namespace geos
{
ElevationMatrixFilter::ElevationMatrixFilter(const ElevationMatrix *newEm):
em(newEm), avgElevation(newEm->getAvgElevation())
{
}
ElevationMatrixFilter::~ElevationMatrixFilter()
{
}
void
ElevationMatrixFilter::filter_rw(Coordinate *c)
{
#if DEBUG
cerr<<"ElevationMatrixFilter::filter_rw("<<c->toString()<<") called"
<<endl;
#endif
if ( ISNAN(c->z) && !ISNAN(avgElevation) )
{
try {
const ElevationMatrixCell &emc = em->getCell(*c);
c->z = emc.getAvg();
if ( ISNAN(c->z) ) c->z = avgElevation;
#if DEBUG
cerr<<" z set to "<<c->z<<endl;
#endif
} catch (IllegalArgumentException *ex) {
delete ex;
c->z = avgElevation;
}
}
#if DEBUG
else
{
cerr<<" already has a Z or avgElevation == NaN"<<endl;
}
#endif
}
} // namespace geos
/**********************************************************************
* $Log: ElevationMatrixFilter.cpp,v $
* Revision 1.3 2004/11/29 16:05:33 strk
* Fixed a bug in LineIntersector::interpolateZ causing NaN values
* to come out.
* Handled dimensional collapses in ElevationMatrix.
* Added ISNAN macro and changed ISNAN/FINITE macros to avoid
* dispendious isnan() and finite() calls.
*
* Revision 1.2 2004/11/26 09:22:50 strk
* Added FINITE(x) macro and its use.
* Made input geoms average Z computation optional in OverlayOp.
*
* Revision 1.1 2004/11/23 16:22:49 strk
* Added ElevationMatrix class and components to do post-processing draping of overlayed geometries.
*
**********************************************************************/
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