How to draw in JPanel

[tikual]

Hi all,

I create a JFrame and add a JPanel at the center. Then how to draw something to this panel? Do I need to create a circle class or rectangle class and then add by JPanel? If yes, can anyone give me example?

Thanks a lot!

tikual

 

[timw]

Have a read of the java.awt.Graphics2D class in the Java API docs and also visit :-

http://java.sun.com/products/jfc/tsc/articles/painting/index.html

Tim

 

[tikual]

Hi,

Thanks for timw answer, one more question. How can I click on a same panel and it draws circle/rectangle or something according to my choice in comboBox?

Thanks

tikual

 

[mackey333]

You would need to use a MouseListener to dectect the click.

see: java.awt.event.MouseListener

-Greg :-Q

 

[tikual]

Hi Greg,

I have implemented MouseListener and it could draw. But I would like it draws according to my comboBox choice. How to do that?

Thanks

tikual

 

[mackey333]

Hey there, glad you got it working so far. See
JComboBox.getSelectedItem() to get the currently selected item in the combo box. Also, you can use java.awt.Event.ItemListener and the ItemStateChanged() method to dectect the change in selection if you want to make it change dynamically.

-Greg :-Q