java - 在 Java 游戏中计算 FPS

Question

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Answer 1

最简单的方法是保存一个变量 whatTheLastTimeWas 并在你想检查帧速率的地方执行此操作:

double fps = 1000000.0 / (lastTime - (lastTime = System.nanoTime())); //This way, lastTime is assigned and used at the same time.

或者，您可以像这样制作一个 FPS 计数器:

class FPSCounter extends Thread{
    private long lastTime;
    private double fps; //could be int or long for integer values

    public void run(){
        while (true){//lazy me, add a condition for an finishable thread
            lastTime = System.nanoTime();
            try{
                Thread.sleep(1000); // longer than one frame
            }
            catch (InterruptedException e){

            }
            fps = 1000000000.0 / (System.nanoTime() - lastTime); //one second(nano) divided by amount of time it takes for one frame to finish
            lastTime = System.nanoTime();
        }
    }
    public double fps(){
        return fps;
    } 
}

然后在您的游戏中，有一个 FPSCounter 的实例，并在一帧完成时调用 nameOfInstance.interrupt();。