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| public class DemoRect {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(new BorderLayout());
final PanelRectangle panel = new PanelRectangle();
frame.getContentPane().add(panel);
frame.setSize(Toolkit.getDefaultToolkit().getScreenSize());
frame.setLocationRelativeTo(null);
frame.addWindowListener(new WindowAdapter() {
private Random random = new Random();
@Override
public void windowOpened(WindowEvent e) {
new Thread() {
public void run() {
for (int i=0;i<3;i++)
{
panel.setRect( random.nextInt(5)*30, random.nextInt(10)*29);
try {
Thread.sleep(1000);// on attend une seconde entre chaque nouveau rectangle
} catch (InterruptedException e) {
break;
}
}
panel.setRect( -1, -1); // pour effacer le rectangle
};
}.start();
}
});
frame.setVisible(true);
}
private static class PanelRectangle extends JPanel {
private int xcarvert=-1;
private int ycarvert=-1;
public void setRect(int x, int y) {
this.xcarvert=x;
this.ycarvert=y;
repaint();
}
@Override
public void paint(Graphics g) {
super.paint(g);
if ( xcarvert>=0 && ycarvert>=0 ) { // permet d'afficher ou pas le rectangle (x=-1 : pas d'affichage
g.setColor(new Color(0,255,0));
g.fillRect(xcarvert,ycarvert, 30, 29);
}
}
}
} |
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