import java.awt.*;
import javax.swing.JFrame;

public class DrawLayers extends Canvas
{
	private Image vMem;
	private Graphics2D gBuf;

	public void init()
	{
		vMem = createImage(getWidth(), getHeight());
		gBuf = (Graphics2D)vMem.getGraphics();
	}
	
	public void paint( Graphics g )
	{
		gBuf.setColor(Color.blue);
		gBuf.fillRect(20,20,100,200);
		
		gBuf.setColor(Color.white);
		gBuf.fillRect(120,20,100,200);

		gBuf.setColor(Color.red);
		gBuf.fillRect(220,20,100,200);

		g.drawImage(vMem, 0, 0, this);
	}
	
	public void update()
	{
		repaint();
	}

	public static void main(String[] args)
	{
		// You can change the title or size here if you want.
		JFrame win = new JFrame("Draw Layers");
		win.setSize(1024,768);
		win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		DrawLayers canvas = new DrawLayers();
		win.add( canvas );
		win.setVisible(true);
		canvas.init();
	}


}