anchor.diff:      int cwidth = canvas.canvas.width;
       int cheight = canvas.canvas.height;
   
  -    int cowidth = (cwidth / gridBlockWidth).round();
  -    int coheight = (cheight / gridBlockWidth).round();
  +    int cowidth = (cwidth / gridBlockSizeInPixels.getX()).round();
  +    int coheight = (cheight / gridBlockSizeInPixels.getY()).round();
   
       this.snake = new Snake(cowidth, coheight);
   
  
positive.code:   CanvasRenderingContext2D canvas;
  
    static Coord snakePenSizeInPixels = new Coord(640, 480);
  
    static const num gridBlockWidth = 10;
    static const num gridBlockHeight = 10;
  
    num initialPauseInMillis = 400;
    num pauseInMillis;
  
negative.code: 
    void renderSquare(final Coord c, final String color) {
       canvas.fillStyle = color;
       canvas.fillRect(gridBlockSizeInPixels.getX() * c.getX(), gridBlockSizeInPixels.getY() * c.getY(), gridBlockSizeInPixels.getX(), gridBlockSizeInPixels.getY());
    }
  
    String name;
  