public class CMAC {

  int tilings,//number of tilings over state space
      xTile,  //number of gridworld states spanned by tile in x dimension
      yTile,  //number of gridworld states spanned by tile in y dimension
      xWorld, //number of gridworld states in the x dimension
      yWorld; //number of gridworld states in the y dimension

  public CMAC(int tilings, int tileWidth, int tileHeight, int worldWidth, int worldHeight) {
    this.tilings = tilings;
    xTile = tileWidth;
    yTile = tileHeight;
    xWorld = worldWidth;
    yWorld = worldHeight;
  }//CMAC()

  //returns unique indices of tiles covering gridworld state x,y
  //x must be between 0 and xWorld-1, y must be between 0 and yWorld-1
  public long[] getTiles(int x, int y) {
    long[] tiles = new long[tilings];
    for(int i=0; i<tilings; i++) {
      long id = 0;
      id += i;
      id *= Math.ceil((double) xWorld/xTile + 1);
      id += (x+xTile-(long)Math.round((double)i*xTile/tilings))/xTile;
      id *= Math.ceil((double) yWorld/yTile + 1);
      id += (y+yTile-(long)Math.round((double)i*yTile/tilings))/yTile;
      tiles[i] = id;
    }//for
    return tiles;
  }//getTiles()

}//CMAC