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draw behind component.

3 replies on 1 page. Most recent reply: Apr 7, 2005 10:31 PM by Matthias Neumair

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Matthias Neumair

Posts: 660
Nickname: neumi
Registered: Sep, 2003

draw behind component.

Posted: Apr 7, 2005 7:30 AM

I have a specialized panel containing some RadioButtons.

Now I need to draw some lines and Polygons on this panel.

So I did overwrite the paint method this way:

public void paint (Graphics g) {
  super.paint(g);
  g.drawLine (...);
  g.fillPolygon (...);
  // *1
}

The consequence is, that the Radio Buttons get overpainted wih the lines.

So at *1 I called the paint method of the buttons again, but that did not make any difference.

It also makes no difference, if the RadioButtons are opaque or not.

Is there a way to do this right?

Matthias Neumair

Posts: 660
Nickname: neumi
Registered: Sep, 2003

Re: draw behind component.

Posted: Apr 7, 2005 7:34 AM

Edit: I called of course the repaint() method of the items, since calling paint(g) would cause the RadioButton to be painted in the left upper corner of the panel.

Amol Brid

Posts: 43
Nickname: amolbrid
Registered: Feb, 2004

Re: draw behind component.

Posted: Apr 7, 2005 11:10 AM

Hi,

If you are using Swings then you should override the paintComponent() method instead of paint() method for custom painting on the component.

You problem will be solved by overriding paintComponent() method of JPanel.

public void paintComponent(Graphics g) {
  super.paintComponent(g); // don't forget to call this
  g.drawLine (...);
  g.fillPolygon (...);
}

While perfoming paint operation in swings the following methods get called in the given order:
1. paintComponent() - paints the component itself.
2. paintBorder() - draw the border of the component.
3. paintChildren() - asks the child controls to paint themselves.

These methods are called from the paint() method, therefore overriding of paint() method should be avoided.

Regards,
Amol Brid.

Matthias Neumair

Posts: 660
Nickname: neumi
Registered: Sep, 2003

Re: draw behind component.

Posted: Apr 7, 2005 10:31 PM

It worked!

Thanks a lot.

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