PennDraw.java
// draw onscreen if defer is false
draw onscreen if defer is false
draw onscreen if defer is false
private static void draw() {
        if (defer) return;
        onscreen.drawImage(offscreenImage, 0, 0, null);
        frame.repaint();
    }
private static void draw ( ) { if ( defer ) return ; onscreen . drawImage ( offscreenImage , 0 , 0 , null ) ; frame . repaint ( ) ; }
draw onscreen if defer is false
draw onscreen if defer is false