systemtimer.java

一个java的免费游戏引擎,里面有文档,和例子

// Decompiled by Jad v1.5.7g. Copyright 2000 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/SiliconValley/Bridge/8617/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi 

package com.golden.gamedev.engine.timer;

import com.golden.gamedev.engine.BaseTimer;

// Referenced classes of package com.golden.gamedev.engine.timer:
//            FPSCounter

public class SystemTimer
    implements BaseTimer
{

    private int a;
    private long b;
    private long c;
    private long d;
    private long e;
    private long f;
    private long g;
    private boolean h;
    private FPSCounter i;

    public SystemTimer()
    {
        a = 50;
        i = new FPSCounter();
    }

    public void startTimer()
    {
        if(h)
            stopTimer();
        h = true;
        b = 1000 / a;
        refresh();
        i.refresh();
    }

    public void stopTimer()
    {
        h = false;
    }

    public long sleep()
    {
        d = System.currentTimeMillis();
        e = d - c;
        f = b - e - g;
        if(f > 0L)
        {
            try
            {
                Thread.sleep(f);
            }
            catch(InterruptedException _ex) { }
            g = System.currentTimeMillis() - d - f;
        } else
        {
            try
            {
                Thread.sleep(1L);
            }
            catch(InterruptedException _ex) { }
            g = 0L;
        }
        i.calculateFPS();
        long l;
        long l1 = (l = System.currentTimeMillis()) - c;
        c = l;
        return l1;
    }

    public boolean isRunning()
    {
        return h;
    }

    public int getCurrentFPS()
    {
        return i.getCurrentFPS();
    }

    public int getFPS()
    {
        return a;
    }

    public void setFPS(int j)
    {
        if(a != j)
        {
            a = j;
            if(h)
                startTimer();
        }
    }

    public long getTime()
    {
        return System.currentTimeMillis();
    }

    public void refresh()
    {
        c = System.currentTimeMillis();
        g = 0L;
    }
}