public boolean isWithinModelSpace() 
		{
			final int x1 = x-radius;
			final int y1 = y-radius;
			final int x2 = x+radius;
			final int y2 = y+radius;

			return x1 > 0 && x2 >0 && x1 <= MODEL_WIDTH && x2 <= MODEL_WIDTH && y1 <= MODEL_HEIGHT && y2 <= MODEL_HEIGHT && y1 > 0 && y2 > 0;
		}