Re: Dashboard effect in Java application

• Subject: Re: Dashboard effect in Java application
• From: Dmitry Markman <email@hidden>
• Date: Tue, 21 Dec 2004 22:34:55 -0500
• Delivered-to: email@hidden
• Delivered-to: email@hidden

yes I tried the very similar code
but instead of 	paint(getGraphics());
I used
                         Graphics g = getGraphics();
                            paint(g);
                         g.dispose();

it gives small gain (~5%) if at all
it requires some additional code to clean frame (images are transparent)

in general in cube situation painting time (80ms on PBG4)  >> dt (6ms)
you'll never sleep

so I decided not to use it

thanks anyway for your suggestion

On Dec 21, 2004, at 4:19 PM, Pete Kirkham wrote:

That reminds me- you are sleeping in an application that is having difficulty performing its operations fast enough:

            Thread.sleep(dt);
            repaint();

Whereas you can do something like:

       	start_time = System.currentTimeMillis();

       	paint current frame to buffer
		(so there's no req't to recalculate if paint
		 is called between frames)

	paint(getGraphics());

	sleep_time = start_time + dt - System.currentTimeMillis();

	if (sleep_time > 0) {
	  Thread.sleep(sleep_time);
	}

so you only sleep if you can render the frames fast enough, and then for an amount that lets you update at the frame rate, not some unknown period.

Pete
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Dmitry Markman

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