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  Recording FPS help  (Read 975 times)
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Offline zidsal

Senior Newbie





« Posted 2011-02-12 21:59:42 »

hi their I've been lurking on these forums for the last week or so and today I decided to make an account after being stuck with these issues (yay for leeching). I'm trying to make a game with java2d and I'm having issues recording the fps.

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//variables used for finding fps
    private long prevStatsTime;
    double fps = 0;
    int frameCount = 0;
    long totalElapsedTime = 0L;

    public void run(){
        .....
        prevStatsTime = System.nanoTime();
        while(running = true){
             .....
             beforeTime = System.nanoTime();    
        }
        ......
        recordInfo();
    }

    public void recordInfo()
    {
         long realElapsedTime = System.nanoTime() - prevStatsTime;


        frameCount++;
        totalElapsedTime += realElapsedTime;
        if(totalElapsedTime > 0)
        fps = (((double)frameCount/totalElapsedTime)*1000000000L);
        prevStatsTime = System.nanoTime();
    }

    public void drawInfo(Graphics g)
    {
         ...
        g.drawString("FPS: " + fps, 0, 30);
    }


the issue I'm having is that the fps slowly decreases so obviously its not recording the fps >.< any help would be really great I would prefer a nudge in the right direction rather then you flat out explaining it to me if you wouldn't mind.

many thanks
Offline Riven
Administrator

« JGO Overlord »


Medals: 1228
Projects: 4
Exp: 16 years


Hand over your head.


« Reply #1 - Posted 2011-02-12 22:06:13 »

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final long measureInterval = 1000 * 1000000L; // one second
long lastMeasure = System.nanoTime();
int frameCounter;
int lastFrameCount;

public void onRenderFrame()
{
    this.frameCounter++;

    long now = System.nanoTime();
    if(now >= this.lastMeasure + measureInterval)
    {
       this.lastFrameRate = this.frameCounter;
       this.frameCounter = 0;
       // WRONG: this.lastMeasure = now;
      this.lastMeasure += measureInterval;
    }
}

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Offline zidsal

Senior Newbie





« Reply #2 - Posted 2011-02-12 22:15:37 »

thank you very much <3
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Offline Captain Awesome

Junior Devvie


Medals: 2


Hi


« Reply #3 - Posted 2011-02-12 22:18:51 »

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final long measureInterval = 1000 * 1000000L; // one second
long lastMeasure = System.nanoTime();
int frameCounter;
int lastFrameCount;

public void onRenderFrame()
{
    this.frameCounter++;

    long now = System.nanoTime();
    if(now >= this.lastMeasure + measureInterval)
    {
       this.lastFrameRate = this.frameCounter;
       this.frameCounter = 0;
       // WRONG: this.lastMeasure = now;
      this.lastMeasure += measureInterval;
    }
}


*yoink*

Thanks  Wink
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