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  Small design question: Worms  (Read 1241 times)
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Offline shikantaza

Junior Newbie





« Posted 2006-05-17 22:00:41 »

Hi,

I rewrote an example from the good book "Killer Game Programming in Java" and now have a question about design.

The main setup is as follows:

There is JPanel implementing the interface runnable. The method run looks like this:

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      while (running) {
         gameUpdate();
         gameRender(); // render the game to a buffer

         paintScreen(); // draw the buffer on-screen


Then follow some rather sophistiacted techniques for sleeping and skipping frames

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         if (sleepTime > 0) { // some time left in this cycle
           try {
               // sleep a bit,
              Thread.sleep(sleepTime / 1000000L); // nano -> ms
           } catch (InterruptedException ex) {
            }
            overSleepTime = (System.nanoTime() - afterTime) - sleepTime;
         } else { // sleepTime <= 0; the frame took longer than the period
           excess -= sleepTime; // store excess time value
           overSleepTime = 0L;

            // count the frames with no delays and yield
           if (++noDelays >= NO_DELAYS_PER_YIELD) {
               Thread.yield(); // give another thread a chance to run
              noDelays = 0;
            }
         }

         beforeTime = System.nanoTime();


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         int skips = 0;
         while ((excess > period) && (skips < MAX_FRAME_SKIPS)) {
            excess -= period;
            gameUpdate(); // update state but don't render
           skips++;
         }
         framesSkipped += skips;



I added a KeyListener to the JPanel and in the gameUpdate() method I added
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         if (keyPressed) {
               worm.moveLeft()


It works, but somehow some keyEvents are not processed. When I press 'down' the worm moves down, but every third time or so it doesn't move.

How can I solve this? What is the principle design pattern?

Should I add some message coming from the worm saying moving was performed successfully?
I'll provide more code if necessary.

Thx for any help.



Offline Kova

Senior Member





« Reply #1 - Posted 2006-05-18 15:05:29 »

strange choice of code you wanted us to see... sleeping techniques that are totally irrelevant you put but not adding key listener or complete code for moving the worm. From code you gave your worm can only move left if any key is pressed (or moveLeft() actually moves him down which would be incredibly stupid Tongue ). Post whole code for moving the worm as the problem is probably there, in the way you determine if down is pressed.
Also note that keyboard can't handle some keys pressed at the same time, did you test it with only down pressed?
Offline shikantaza

Junior Newbie





« Reply #2 - Posted 2006-05-18 18:57:37 »

Yes you're right. I didn't pose my question very well. I think I have solved my original issue.

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