30
Sep
Figure 2-2 Rectangle boogie This boogie action is
public void start() { System.out.println(”>> start <<"); animation = new Thread(this); if (animation != null) { animation.start(); } } public void paint(Graphics g) { System.out.println(">> paint <<"); g.setColor(Color.yellow); g.fillRect(0,0,90,90); g.fillRect(250,0,40,190); g.fillRect(80,110,100,20); // hidden rectangle g.setColor(Color.blue); g.fillRect(80,200,220,90); g.fillRect(100,10,90,80); g.setColor(Color.lightGray); g.fillRect(locx,locy,width,height); g.setColor(Color.red); g.fillRect(200,0,45,45); g.fillRect(0,100,70,200); g.setColor(Color.magenta); g.fillRect(200,55,60,135); } // update the center rectangle void updateRectangle() { switch (state) { case DOWN: locy += 2; if (locy >= 110) { state = UP; } break; case UP: locy -= 2; if (locy <= 90) { state = RIGHT; } break;
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