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triangle.h

// Copyright 2004 David Hilvert <dhilvert@auricle.dyndns.org>,
//                              <dhilvert@ugcs.caltech.edu>

/*  This file is part of the Anti-Lamenessing Engine.

    The Anti-Lamenessing Engine 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.

    The Anti-Lamenessing Engine 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 the Anti-Lamenessing Engine; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef __triangle_h__
#define __triangle_h__

/*
 * A triangle filter class.
 */

class triangle : public filter {
private:
      ale_real half_width;

      /*
       * Triangle filter.
       */
      double _triangle(ale_pos p) const {
            if (fabs(p) >= half_width)
                  return 0;

            return (1 - fabs(p) / half_width);
      }

      double _triangle(point p) const {
            return _triangle(p[0]) * _triangle(p[1]);
      }

public:

      /*
       * Size of filter support, in number of half-cycles to each side of the
       * filter center.
       */
      virtual ale_real support() const {
            return half_width;
      }

      virtual int equals(const filter *f) const {
            if (typeid(*f) == typeid(*this))
                  return ((triangle *)f)->half_width == half_width;
            return 0;
      }

      /*
       * Response of filter at point p
       */
      virtual ale_real response(point p) const {
            return _triangle(p);
      }

      triangle(ale_real half_width) {
            this->half_width = half_width;
      }

};
#endif

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