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Q4002 How can I preload an image before I paint it?

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Use ImageObserver interface, ImageObserver is an interface used to receive notification as an image is being generated. ImageObserver defines only one method: imageUpdate(). The following code waits until the image is completely loaded before snapping it onto the screen in a single repaint.

public boolean imageUpdate(Image img, int flags, int x, int y, int w, int h){
    if ((flags & ALLBITS) != 0{
    } else if (flags & (ABORT|ERROR)) != 0){
      error = true; //file not found
    return (flags & (ALLBITS|ABORT|ERROR)) == 0;

©2018 Martin Webb