Basic HTML version of Foils prepared 18 May 97

Foil 27 Double Buffering to Reduce Flicker - II

From Java Tutorial - Spring 1997 Part 3:Graphics and the Abstract Windowing Toolkit Peking Tutorial, Web Certificate -- Spring-Summer 1997. by Nancy J. McCracken,Geoffrey C. Fox
1 In paint(), one will construct applet image in offscreenGraphics as opposed to the argument g of paint(). So one would see statements such as:
  • offscreenGraphics.drawImage(img,10,10,this);
2 Finally at end of paint(), one could transfer the off-screen image to g by
  • g.drawImage(offscreenImage,0,0,this);
3 One would also need to override the update() method by
4 public void update(Graphics g) {
  • paint(g);
  • }
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