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  Using timers in games, am I right?  (Read 940 times)
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Offline K.I.L.E.R

Senior Member




Java games rock!


« Posted 2005-02-08 06:38:37 »

frames passed / time taken to execute those frames = fps.

This is how I always understood it.
speed = distance / time.

I assume this is correct.

163ticks / 5 seconds = 32.6fps.

Right or wrong?

I'm using Sun's timer which is updated in 1.5(Tiger).
It can now be run as a daemon.
This is how I execute my game logic.

Timer class:
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public class GameIntervalTimer extends TimerTask
{
      private Timer timer;
      private boolean isConditionMet;
     
     
      public GameIntervalTimer(String nameOfThread, long periodOfExecution)
      {
            try
            {
                  timer = new Timer(nameOfThread, true);
                  timer.scheduleAtFixedRate(this, 0L, periodOfExecution);
            }catch(Exception e)
            {
                  System.out.println(e.getMessage());
            }
           
            isConditionMet = false;
      }


      /* (non-Javadoc)
       * @see java.lang.Runnable#run()
       */

      public void run()
      {
            this.isConditionMet = true;
      }
     
      /**
       * Call this method after the timer has finished a round of execution.
       * If you do not call this method at the appropriate time or not at all, you will have issues.
       */

      public void resetTimeToExecute()
      {
            this.isConditionMet = false;
      }
     
     
      public void setTimerRateOfExecution( long periodOfExecution )
      {
            this.timer.scheduleAtFixedRate(this, 0L, periodOfExecution);
      }
     
      public boolean isConditionMet()
      {
            return this.isConditionMet;
      }
     
}


How it's used:
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//this line of code is executed once in the constructor
timer = new GameIntervalTimer("Logic", 10);

if(timer.isConditionMet())
            {
                  playerMadeTurn = true;
                 
                  if(playerMadeTurn)
                  {
                        play.executeLogic();
                        playerMadeTurn = false;
                  }
                  System.out.println("executed " + ticks++);
                  timer.resetTimeToExecute();
            }

Vorax:
Is there a name for a "redneck" programmer?

Jeff:
Unemployed. Wink
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