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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.
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This frame buffer is then directly copied to the main applet Graphics object without clearing image as in default update()
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Image OffscreenImage; // Place to hold Image
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Graphics offscreenGraphics; // The second graphics context which contains offscreenImage
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offscreenImage = createImage(width,height);
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offscreenGraphics = offscreenImage.getGraphics();
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