// Shows Double buffering so no image flickering!
import java.applet.Applet;
import java.awt.*;

public class Flicker2 extends TerribleFlicker {
   
	int nextx;
	int nexty;
	Graphics og;
	Image offScrImg;

	void cliptoaffectedarea (Graphics g, int oldx, int oldy, int newx, int newy, int width, int height)
	{
		int x = Math.min(oldx, newx);
		int y = Math.min(oldy, newy);
		int w = ( Math.max(oldx, newx) + width) - x;
		int h = ( Math.max(oldy, newy) + height) - y;
		g.clipRect(x,y,w,h);
	}

   	//  update
   	public void update( Graphics g )
   	{
 		if (offScrImg == null)
			offScrImg = createImage(size().width, size().height);
		og = offScrImg.getGraphics();
	
 		int lastx = currentx;
		int lasty = currenty;
		currentx = nextx;
		currenty = nexty;
		cliptoaffectedarea (og, lastx, lasty, currentx, currenty, imgWidth, imgHeight);
		cliptoaffectedarea (g, lastx, lasty, currentx, currenty, imgWidth, imgHeight);

		paint(og);
		g.drawImage(offScrImg, 0, 0, this);
		og.dispose();
   	}

	public boolean mouseDrag (Event e, int x, int y)
	{
		nextx = x;
		nexty = y;
		repaint();
		return true;
	}
 }