d2/filter/filter.h

   1 // Copyright 2004 David Hilvert <dhilvert@auricle.dyndns.org>,
   2 //                              <dhilvert@ugcs.caltech.edu>
   3
   4 /*  This file is part of the Anti-Lamenessing Engine.
   5
   6     The Anti-Lamenessing Engine is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 3 of the License, or
   9     (at your option) any later version.
  10
  11     The Anti-Lamenessing Engine is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with the Anti-Lamenessing Engine; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 */
  20
  21 #ifndef __filterclass_h__
  22 #define __filterclass_h__
  23
  24 /*
  25  * A superclass for all filtering classes.
  26  */
  27
  28 class filter {
  29 public:
  30
  31         /*
  32          * Size of filter support, in number of half-cycles to each side of the
  33          * filter center.
  34          */
  35         virtual ale_real support() const = 0;
  36
  37         /*
  38          * Response of filter at point p
  39          */
  40         virtual ale_real response(point p) const = 0;
  41
  42         virtual int equals(const filter *f) const = 0;
  43
  44         virtual ~filter(){
  45         }
  46 };
  47 #endif