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/**********************************************************************
* $Id: ElevationMatrix.cpp,v 1.5 2004/12/08 13:54:44 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 <sstream>
#include <geos/geom.h>
#include <geos/opOverlay.h>
#define DEBUG 0
#define ASSERT 1
namespace geos
{
ElevationMatrix::ElevationMatrix(const Envelope &newEnv,
unsigned int newRows, unsigned int newCols):
env(newEnv), cols(newCols), rows(newRows),
avgElevationComputed(false),
avgElevation(DoubleNotANumber),
cells(newRows*newCols)
{
cellwidth=env.getWidth()/cols;
cellheight=env.getHeight()/rows;
if ( ! cellwidth ) cols=1;
if ( ! cellheight ) rows=1;
}
ElevationMatrix::~ElevationMatrix()
{
}
void
ElevationMatrix::add(const Geometry *geom)
{
#if DEBUG
cerr<<"ElevationMatrix::add(Geometry *) called"<<endl;
#endif // DEBUG
#if ASSERT
Assert::isTrue(!avgElevationComputed, "Cannot add Geometries to an ElevationMatrix after it's average elevation has been computed");
#endif
// Todo: optimize so to not require a CoordinateSequence copy
CoordinateSequence *cs = geom->getCoordinates();
add(cs);
delete cs;
}
void
ElevationMatrix::add(const CoordinateSequence *cs)
{
unsigned int ncoords = cs->getSize();
for (unsigned int i=0; i<ncoords; i++)
{
add(cs->getAt(i));
}
}
void
ElevationMatrix::add(const Coordinate &c)
{
if ( ISNAN(c.z) ) return;
try {
ElevationMatrixCell &emc = getCell(c);
emc.add(c);
} catch (IllegalArgumentException *exp) {
// coordinate do not overlap matrix
cerr<<"ElevationMatrix::add("<<c.toString()<<"): Coordinate does not overlap grid extent: "<<exp->toString()<<endl;
delete exp;
return;
}
}
ElevationMatrixCell &
ElevationMatrix::getCell(const Coordinate &c)
{
int col, row;
if ( ! cellwidth ) col=0;
else
{
double xoffset = c.x - env.getMinX();
col = (int)(xoffset/cellwidth);
if ( col == (int)cols ) col = cols-1;
}
if ( ! cellheight ) row=0;
else
{
double yoffset = c.y - env.getMinY();
row = (int)(yoffset/cellheight);
if ( row == (int)rows ) row = rows-1;
}
int celloffset = (cols*row)+col;
if (celloffset<0 || celloffset >= (int)(cols*rows))
{
ostringstream s;
s<<"ElevationMatrix::getCell got a Coordinate out of grid extent ("<<env.toString()<<") - cols:"<<cols<<" rows:"<<rows;
throw new IllegalArgumentException(s.str());
}
return cells[celloffset];
}
const ElevationMatrixCell &
ElevationMatrix::getCell(const Coordinate &c) const
{
return (const ElevationMatrixCell &)
((ElevationMatrix *)this)->getCell(c);
}
double
ElevationMatrix::getAvgElevation() const
{
if ( avgElevationComputed ) return avgElevation;
double ztot=0;
int zvals=0;
for (unsigned int r=0; r<rows; r++)
{
for(unsigned int c=0; c<cols; c++)
{
const ElevationMatrixCell &cell = cells[(r*cols)+c];
double e = cell.getAvg();
if ( !ISNAN(e) )
{
zvals++;
ztot+=e;
}
}
}
if ( zvals ) avgElevation = ztot/zvals;
return avgElevation;
}
string
ElevationMatrix::print() const
{
ostringstream ret;
ret << "Cols:"<<cols<<" Rows:"<<rows<<" AvgElevation:"<<getAvgElevation()<<endl;
for (unsigned int r=0; r<rows; r++)
{
for (unsigned int c=0; c<cols; c++)
{
ret << cells[(r*cols)+c].print() << '\t';
}
ret << endl;
}
return ret.str();
}
void
ElevationMatrix::elevate(Geometry *g) const
{
ElevationMatrixFilter filter(this);
g->apply_rw(&filter);
}
} // namespace geos;
/**********************************************************************
* $Log: ElevationMatrix.cpp,v $
* Revision 1.5 2004/12/08 13:54:44 strk
* gcc warnings checked and fixed, general cleanups.
*
* Revision 1.4 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 1.3 2004/11/26 09:22:50 strk
* Added FINITE(x) macro and its use.
* Made input geoms average Z computation optional in OverlayOp.
*
* Revision 1.2 2004/11/24 12:29:36 strk
* Handled boundary cases in ::getCell
*
* 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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