wait() in paint()

[hi19hi19]

public void paint(Graphics gfx)
    {
    if (this.gameState == GAME_STATE_RUNNING)
        {
            this.drawMyStuff();

            try
            {
                wait(WAIT_TIME);
            }
            catch(InterruptedException e)
            {
                System.out.println("Something screwed up: " + e);
            }
            catch(IllegalMonitorStateException e)
            {
                System.out.println("Something screwed up: " + e);
            }
            
            this.repaint();
        }
    }

This is paint() method from my program. The class extends JFrame FYI.

I want it to wait long WAIT_TIME milliseconds before the repaint().
To make pause before looping my painting.
When I run this, it generates an exception every single time I repaint()
Specifically, it throws a java.lang.IllegalMonitorStateException every time.

How to fix?

[evilbutterfly]

Re: wait() in paint()

I'm guessing you're making some sort of game or something and you don't want some computers to blaze through the whole thing. If you're getting started making a game, this tutorial I used to start off is really helpful: http://www.planetalia.com/cursos/

Somewhere in there it tells how to do what I believe you're looking for. Instead of putting it in the paint method for things, they do it like this:

while (!gameEnded)
{
	long startTime = System.currentTimeMillis();

	checkCollisions();
	updateWorld();
	paintWorld();
	usedTime = System.currentTimeMillis()-startTime;
	do
	{
		Thread.yield();
	}while (System.currentTimeMillis()-startTime< 17);
}

Basically it stops it for 17 milliseconds every frame. You can change that and the game will speed up or down. Maybe I'm mistaken and you're not making a game, but the thread yielding thing should still work.

[hi19hi19]

Re: wait() in paint()

Elegant. Thanks.

Yes, I was making a simulation for the Game of Life for a school project. It took 10 minutes to code the actual stuff so I was using the remaining time to make a graphical interface just for fun.

EDIT- If I make the grid really big, like 70 x 70, the lag due to my sloppy-ish code alone slows it down enough. But for smaller grids that works nicely.

[unknown_soldier]

Re: wait() in paint()

im new

[seththelezzy]

Re: wait() in paint()

im new

...Go to the newbie forum. Read the stickies.

This is the wrong place to put this.

[midnghtraver]

Re: wait() in paint()

April 23rd. and only 4 posts, and 3 that only really matter. omg. And it was made by the step w1zz3r3d.