How to speed up zoom-in/zoom-out of the image with swing?

Question

How to reduce the overhead of the image zoom in and zoom out.

Here is my code which takes too long time to zoom-in/zoom-out the image...

@Override
public void mouseWheelMoved(MouseWheelEvent e) {
    int myX = 0;
    int myY = 0;

    if (e.getScrollType() == MouseWheelEvent.WHEEL_UNIT_SCROLL) {
        try {
            float amount = e.getWheelRotation() * 5f;
            myX = (int) (label.getWidth() + amount);
            myY = (int) (label.getHeight() + amount);
            imgX = myX;
            imgY = myY;
            label.setSize(myX, myY);
            scalledItemImage = itemImage.getScaledInstance(imgX, imgY,
                    BufferedImage.TYPE_INT_ARGB);
            ImageIcon icon = new ImageIcon(scalledItemImage);
            label.setIcon(icon);
            repaint();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

How to speedup the image rendering with the expected resolution and clarity of the image.

Answer 1

you call the scale method in a wrong way....

• BufferedImage.TYPE_ARGB = 6; http://docs.oracle.com/javase/7/docs/api/constant-values.html#java.awt.image.BufferedImage.TYPE_4BYTE_ABGR
• Image.SCALE_FAST = 2; http://docs.oracle.com/javase/7/docs/api/constant-values.html#java.awt.Image.SCALE_FAST

try to call :

scalledItemImage = itemImage.getScaledInstance(imgX, imgY,
                BufferedImage.SCALE_FAST);

(as proposed above)