code: function( value, axis ){
  			if( !value ) return 0;
  			if( typeof value === 'number' ) return value;
  			// a percentage
  			return parseInt(value, 10) / 100 *
  				(axis === 'x' ? this.canvas.width : this.canvas.height);
  		}
docs: Returns the scaled pixels. Given the value passed
  @param {int/string} value - either an integer for # of pixels,
  or 'x%' for relative
  @param {char} axis - x, y