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//
// Filename : FastGrid.h
// Author(s) : Stephane Grabli
// Purpose : Class to define a cell grid surrounding the
// bounding box of the scene
// Date of creation : 30/07/2002
//
///////////////////////////////////////////////////////////////////////////////
//
// 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 FASTGRID_H
# define FASTGRID_H
# include "Grid.h"
# include <cassert>
/*! Class to define a regular grid used for ray
* casting computations
* We don't use a hashtable here. The grid is
* explicitly stored for faster computations.
* However, this might result in significant
* increase in memory usage (compared to the regular grid)
*/
class LIB_GEOMETRY_EXPORT FastGrid : public Grid
{
public:
FastGrid() : Grid() {
_cells = NULL;
_cells_size = 0;
}
virtual ~FastGrid() {
clear();
}
/*! clears the grid
* Deletes all the cells, clears the hashtable,
* resets size, size of cell, number of cells.
*/
virtual void clear();
/*! Sets the different parameters of the grid
* orig
* The grid origin
* size
* The grid's dimensions
* nb
* The number of cells of the grid
*/
virtual void configure(const Vec3r& orig, const Vec3r& size, unsigned nb);
/*! returns the cell whose coordinates are pased as argument */
Cell* getCell(const Vec3u& p) ;
/*! Fills the case p with the cell iCell */
virtual void fillCell(const Vec3u& p, Cell& cell);
protected:
Cell** _cells;
unsigned _cells_size;
};
#endif // FASTGRID_H
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