/**
* Method to force the picture to repaint itself. This is very useful after you have changed the
* pixels in a picture and you want to see the change.
*/
public void repaint() {
// if there is a picture frame tell it to repaint
if (pictureFrame != null) pictureFrame.repaint();
// else create a new picture frame
else pictureFrame = new PictureFrame(this);
}
