Basic HTML version of Foils prepared 13 October 97

Foil 24 Double Buffering to Reduce Flicker - I

From Java Tutorial, July 1, 1996 CSC499(JSU) CPS406/606 -- Fall Semester 97. 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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