/**
* Return the world's background image. The image may be used to draw onto the world's background.
*
* @return The background image
*/
public GreenfootImage getBackground() {
if (backgroundImage == null) {
backgroundImage = new GreenfootImage(getWidthInPixels(), getHeightInPixels());
backgroundImage.setColor(DEFAULT_BACKGROUND_COLOR);
backgroundImage.fill();
backgroundIsClassImage = false;
} else if (backgroundIsClassImage) {
// Make the image a copy of the original to avoid modifications
// to the original.
backgroundImage = backgroundImage.getCopyOnWriteClone();
backgroundIsClassImage = false;
}
return backgroundImage;
}
