Inner-Transparent Selection Window in Java using GlassPane

I am trying to achieve the following

http://www.qksnap.com/i/3hunq/4ld0v/screenshot.png

I am currently able to draw rectangles successfully on a semi-transparent glasspane background using the following code:

    protected void paintComponent(Graphics g) {
          Graphics2D g2 = (Graphics2D) g;
          g.setColor(Color.black); // black background
          g.fillRect(0, 0, frame.getWidth(), frame.getHeight());
          g2.setColor(Color.GREEN.darker());
          if (getRect() != null && isDrawing()) {
            g2.draw(getRect()); // draw our rectangle (simple Rectangle class)
          }
         g2.dispose();
}

Which works great, however, I would love to have the area within the rectangle be completely transparent while the outside was still darken much like the screenshot above.

Any ideas?

..have the area within the rectangle be completely transparent while the outside was still darken much like the screenshot above.

• Create a Rectangle (componentRect) that is the size of the component being painted.
• Create an Area (componentArea) of that shape (new Area(componentRect)).
• Create an Area (selectionArea) of the selectionRectangle.
• Call componentArea.subtract(selectionArea) to remove the selected part.
• Call Graphics.setClip(componentArea)
• Paint the semi-transparent color.
• (Clear the clipping area if more paint operations are required).