/**
* Set the canvas visibility and brings canvas to the front of screen when made visible. This
* method can also be used to bring an already visible canvas to the front of other windows.
*
* @param visible boolean value representing the desired visibility of the canvas (true or false)
*/
public void setVisible(boolean visible) {
if (graphic == null) {
// first time: instantiate the offscreen image and fill it with
// the background color
Dimension size = canvas.getSize();
canvasImage = canvas.createImage(size.width, size.height);
graphic = (Graphics2D) canvasImage.getGraphics();
graphic.setColor(backgroundColor);
graphic.fillRect(0, 0, size.width, size.height);
graphic.setColor(Color.black);
}
frame.setVisible(visible);
}
