Java Implementing A Working FPS System

I am coding a "Gravity Simulator" in java, which just includes a ball that has ax and y force.

The way I'm doing it at the moment (which is not working) is the following:

Rules of the program: 4 pixels count as 1 meter. the gravity is 9.8m/s^2, so earth gravity.

in my main class I have this:

public int sleepMilli = 17; //the thread will sleep 17 milliseconds after every execution
public double g = 9.8; //gravity

then, in the main loop I have this:

try {
            Thread.sleep(17);
        } catch (InterruptedException e) {
            System.out.println("Thread couldn't sleep.");
            e.printStackTrace();
        }

so. how would I go about implementing a working fps system into this "game" so it doesn't affect the movement speed of the ball?

If you want any more information provided, simply ask me to do so.

---

One common solution is make all your simulation methods take the amount of seconds that elapsed since the last frame as an argument. For example public void move(float secondsElapsed) .

Then, in that main thread, measure the time that elapsed since last frame using System.currentTimeMilis() , don't assume that Thread.sleep(17); will sleep for exactly 17 miliseconds.

This has two advantages: 1) super easy change of desired FPS and 2) your objects will move at correct speeds even if the game FPS would drop.

链接地址: http://www.djcxy.com/p/65408.html

上一篇: 太阳系模拟器物理整合问题（虚幻引擎4，C ++）

下一篇: Java实现一个工作FPS系统