text: //*******************************************************************
  // Copyright (C) 2000 ImageLinks Inc.
  //
  // License:  MIT
  // 
  // See LICENSE.txt file in the top level directory for more details.
  //
  // Author:  David Burken Copied from TiledImageHash.
  //
  // Description: Hashing function for tiled rectangles.  Will hash a
  //              dpt or fpt to a single index value.
  //
  // NOTE:  Works on rectangles that are positive in the line up (y)
  //        direction.  Use TiledImageHash for rectangles that are positive
  //        in the line down direction.
  //              
  //*******************************************************************
  //  $Id: ossimTileHash.h 9094 2006-06-13 19:12:40Z dburken $
  
  #ifndef TileHash_HEADER
  #define TileHash_HEADER
  
  #include <ossim/base/ossimDrect.h>
  #include <ossim/base/ossimPointHash.h>
  
  class OSSIMDLLEXPORT ossimTileHash : public ossimPointHash
  {
  public:
     ossimTileHash(const ossimDrect &imageRect,
                   double tileWidth,
                   double tileHeight);
  
     virtual ~ossimTileHash();
  
     virtual long operator()(const ossimDpt &aPoint);
     virtual long operator()(const ossimFpt &aPoint);
     
  private:
     ossimDrect   theImageRect;
     double  theTileWidth;
     double  theTileHeight;
     long    theNumberOfHorizTiles;
     long    theNumberOfVertTiles;
  };
  
  #endif
  