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[java] Double Buffering

Started by Kertap Mar 30, 2004 at 4:55 AM 3 replies 950+ views

Original Post

Mar 30, 2004 at 4:55 AM

I was just makeing a form the other night when I noticed that the default constructor for JPanel makes one with a double buffer and a flow layout. Question 1: Does the window the JPanel appear have to be double buffered? Question 2: Is it possible to get access to the JPanel''s buffers or do you call paint()?

cyrax256

Mar 30, 2004 at 6:51 AM

Hi!:

1) All the Swing components are double buffered by default, if that's what you ask. The window that holds it doesn't have anything to do with the JPanel.

2) You should override the paintComponent() method (instead of the traditional paint() method). That's because Swing does some things in paint(), and if you override them the result wouldn't be the best.

Bye,

Ciro.

[EDIT: I said update() method, which was wrong. Thanks to Anonymous Poster]

[edited by - cyrax256 on March 30, 2004 1:00:58 PM]

Strife

Mar 30, 2004 at 4:44 PM

Just FYI, this is one of the questions that will be appearing in the FAQ in the near future, so stay tuned.

nonnus29

Mar 31, 2004 at 12:05 PM

You can use createBufferStrategy(int numofbuffers) to get double buffering in a Window or Canvas class/subclass. Then use getDrawGraphics() to get the Graphics to the current backbuffer. Then do a BufferStategy.show() to flip them.

See the wiki here for an example:

http://community.java.net/games/

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