Basic HTML version of Foils prepared Sept 21 1998

Foil 24 Double Buffering to Reduce Flicker - I

From Java Tutorial 98- 3: Graphics and the Abstract Windowing Toolkit NAVO Tutorial -- Sept 23 1998. by Geoffrey C. Fox, Nancy McCracken


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(getSize().width,getSize().height);
    • offscreenGraphics = offscreenImage.getGraphics();

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