private void createScreen() {

		screenW = w-startScreenX;
		screenH = h-startScreenY-colorToolBarH;

		screen = new BufferedImage(screenW, screenH, BufferedImage.TYPE_INT_ARGB);
		screenGraphics = screen.createGraphics();
		screenGraphics.setColor(Color.WHITE);
		screenGraphics.fillRect(0, 0, screen.getWidth(), screen.getHeight());

	}