Basic HTML version of Foils prepared 18 May 97

Foil 26 Double Buffering to Reduce Flicker - I

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 Here you have two "graphics contexts" (frame buffers of the size of the applet), and you construct the next image for an animation "off-line" in the second frame buffer.
2 This frame buffer is then directly copied to the main applet Graphics object without clearing image as in default update()
3 In init(), you would create the frame buffer:
  • Image OffscreenImage; // Place to hold Image
  • Graphics offscreenGraphics; /* The second graphics context of offscreenImage */
  • offscreenImage = createImage(width,height);
  • offscreenGraphics = offscreenImage.getGraphics();

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