//(c) A+ Computer Science

// www.apluscompsci.com

//double buffering example

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Color;

import java.awt.image.BufferedImage;

import java.awt.Canvas;

public class DoubleBuffer extends Canvas

{

private BufferedImage back;

public DoubleBuffer()

{

setBackground(Color.WHITE);

}

public void paint( Graphics window )

{

Graphics2D twoDGraph = (Graphics2D)window;

//take a snap shop of the current Frame and same it as an image

//that is the exact same width and height as the current Frame

if(back==null)

back = (BufferedImage)(createImage(getWidth(),getHeight()));

//create a graphics reference to the back ground image

//we will draw all changes on the background image

Graphics graphToBack = back.createGraphics();

graphToBack.setColor(Color.RED);

for (int count=50; count<getWidth()/2; count+=20)

{

graphToBack.fillRect(count, count, 15, count/2);

}

//load the background image as the forground image

//loading all changes as one image reduces flicker

twoDGraph.drawImage(back, null, 0, 0);

}

}