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//
// Filename : GridDensityProvider.h
// Author(s) : Alexander Beels
// Purpose : Class to define a cell grid surrounding
// the projected image of a scene
// Date of creation : 2011-2-5
//
///////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) : Please refer to the COPYRIGHT file distributed
// with this source distribution.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef GRIDDENSITYPROVIDER_H
#define GRIDDENSITYPROVIDER_H
#include <stdexcept>
#include <memory>
#include "OccluderSource.h"
#include "../geometry/BBox.h"
class GridDensityProvider {
// Disallow copying and assignment
GridDensityProvider (const GridDensityProvider& other);
GridDensityProvider& operator= (const GridDensityProvider& other);
public:
GridDensityProvider (OccluderSource& source)
: source(source) {
}
virtual ~GridDensityProvider() {};
float cellSize() {
return _cellSize;
}
unsigned cellsX() {
return _cellsX;
}
unsigned cellsY() {
return _cellsY;
}
float cellOrigin(int index) {
if ( index < 2 ) {
return _cellOrigin[index];
} else {
throw new out_of_range("GridDensityProvider::cellOrigin can take only indexes of 0 or 1.");
}
}
static void calculateOptimalProscenium(OccluderSource& source, real proscenium[4]) {
source.begin();
if ( source.isValid() ) {
const Vec3r& initialPoint = source.getGridSpacePolygon().getVertices()[0];
proscenium[0] = proscenium[1] = initialPoint[0];
proscenium[2] = proscenium[3] = initialPoint[1];
while ( source.isValid() ) {
GridHelpers::expandProscenium (proscenium, source.getGridSpacePolygon());
source.next();
}
}
cout << "Proscenium: (" << proscenium[0] << ", " << proscenium[1] << ", " << proscenium[2] << ", " << proscenium[3] << ")" << endl;
}
static void calculateQuickProscenium(const GridHelpers::Transform& transform, const BBox<Vec3r>& bbox, real proscenium[4]) {
real z;
// We want to use the z-coordinate closest to the camera to determine the proscenium face
if ( ::fabs(bbox.getMin()[2]) < ::fabs(bbox.getMax()[2]) ) {
z = bbox.getMin()[2];
} else {
z = bbox.getMax()[2];
}
// Now calculate the proscenium according to the min and max values of the x and y coordinates
Vec3r minPoint = transform(Vec3r(bbox.getMin()[0], bbox.getMin()[1], z));
Vec3r maxPoint = transform(Vec3r(bbox.getMax()[0], bbox.getMax()[1], z));
cout << "Bounding box: " << minPoint << " to " << maxPoint << endl;
proscenium[0] = std::min(minPoint[0], maxPoint[0]);
proscenium[1] = std::max(minPoint[0], maxPoint[0]);
proscenium[2] = std::min(minPoint[1], maxPoint[1]);
proscenium[3] = std::max(minPoint[1], maxPoint[1]);
cout << "Proscenium : " << proscenium[0] << ", " << proscenium[1] << ", " << proscenium[2] << ", " << proscenium[3] << endl;
}
protected:
OccluderSource& source;
unsigned _cellsX, _cellsY;
float _cellSize;
float _cellOrigin[2];
};
class GridDensityProviderFactory {
// Disallow copying and assignment
GridDensityProviderFactory (const GridDensityProviderFactory& other);
GridDensityProviderFactory& operator= (const GridDensityProviderFactory& other);
public:
GridDensityProviderFactory()
{
}
virtual auto_ptr<GridDensityProvider> newGridDensityProvider(OccluderSource& source, const real proscenium[4]) =0;
virtual auto_ptr<GridDensityProvider> newGridDensityProvider(OccluderSource& source, const BBox<Vec3r>& bbox, const GridHelpers::Transform& transform) =0;
virtual auto_ptr<GridDensityProvider> newGridDensityProvider(OccluderSource& source) =0;
virtual ~GridDensityProviderFactory () {}
};
#endif // GRIDDENSITYPROVIDER_H
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