painting problems

[Tian Zhang]

hi there!

just a quick question, i have two classes as follows:

    public class GraphDisplayer extends Frame {
public GraphDisplayer(int width, int height, String title) {
super(title);
 
setSize(width, height);
 
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
dispose();
System.exit(0);
}
});
 
setVisible(false);
}
 
public void paint(Graphics g){
super.paint(g);
}

and the later on else where in a different class i have

Graphics g = display.getGraphics();
 
g.setColor(Color.black);
g.drawRect(inst.displayX(), inst.displayY(), 100, 100);
g.drawRect(fact.displayX(), fact.displayY(), 105, 105);
 
display.paint(g);

unfortunatly the instance of display does not show the two rectangles... could you tell me where i'm going wrong?

thanks,

[Rusty Shackleford]

I am not too knowlegable in GUI stuff, but don't you want setVisible(true); ?

It is painting it, but is the frame is not visible. Hope that helps.

[rob armstrong]

extends JFrame?
roba

[Ken Blair]

As Rusty mentioned you need to make the Frame visible using setVisible(true) not false. Your code won't work though, it's going to paint the rectangles once. As soon as the frame repaints the rectangles will be gone. You need to move your rectangle painting code to paint() method of the frame or to a widget which you add to the frame.