code: public void setImageSize(Point size) {
  		Assert.isNotNull(size);
  		Assert.isTrue(size.x >= 0 && size.y >= 0);
  		fSize = size;
  	}
docs: Sets the size of the image created by calling {@link #createImage()}.
  
  @param size
  the size of the image returned from calling
  {@link #createImage()}