Zooming in on a picture?

[Gary Bryan]

I am making a program which involves zooming in on a picture made out of an Image and several shapes drawn on using Graphics methods, where a JSlider is used to change the magnification, and the picture is on a JPanel subclass. I have written a zoom method, which works but is very slow and often causes the computer to run out of memory, especially when zooming in on images larger than about 200x200, with a magnification of over 3x. Here is the code (toDraw is an Image of what is currently on the display, and is painted onto the screen in the paint method):

    public void zoom(double mag) {
        Image zoomedImage = toDraw.getScaledInstance((int)(toDraw.getWidth(this) * mag), (int)(toDraw.getHeight(this) * mag),Image.SCALE_FAST);
        toDraw = zoomedImage;
        
        repaint();
    }

Is there any way I could change this to make the zooming a lot faster?
Thanks.
[ June 30, 2003: Message edited by: G Bryan ]