code: public Icon offset(int offsetX, int offsetY)
  	{
  		initSprite(sheetWidth, sheetHeight, getOriginX() + offsetX, getOriginY() + offsetY, isRotated());
  		return this;
  	}
docs: Offsets this {@link Icon} by a specified amount. <b>offsetX</b> and <b>offsetY</b> are specified in pixels.
  
  @param offsetX the x offset
  @param offsetY the y offset
  @return this {@link Icon}