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/* ----------------------------------------------------------------------- *
 * This file is part of GEL, http://www.imm.dtu.dk/GEL
 * Copyright (C) the authors and DTU Informatics
 * For license and list of authors, see ../../doc/intro.pdf
 * ----------------------------------------------------------------------- */

/**
 * @file GradientFilter.h
 * Compute gradients from a voxel grid. The class maintains a reference to a 
 * voxel grid and acts as a filter for gradient computation.
 */

#ifndef __GEOMETRY_VOXELGRID_GRADIENTFILTER_H
#define __GEOMETRY_VOXELGRID_GRADIENTFILTER_H
// Author: J. Andreas Bærentzen,
// Created: Wed Feb 13 11:00:1

#include "../CGLA/Vec3i.h"
#include "../CGLA/Vec3f.h"


namespace Geometry
{
                ///     This class is a filter that computes gradients from a grid.
                template<class GridT>
  class GradientFilter
  {
                const GridT* const grid;
  public:
                typedef CGLA::Vec3f DataType;

    GradientFilter(const GridT* const _grid): grid(_grid) {}

                bool map(const CGLA::Vec3i&, CGLA::Vec3f&) const;

                bool in_domain(const CGLA::Vec3i& p) const;

                const CGLA::Vec3f operator[](const CGLA::Vec3i& pi) const
                {
                        CGLA::Vec3f g(0);
                        map(pi,g);
                        return g;
                }
  };

}
#endif