FPS计算New

using UnityEngine;
using System.Collections;

public class CarGUI : MonoBehaviour
{
    private const float FPS_UPDATE_INTERVAL = 0.5f;
    private float fpsAccum = 0;
    private int fpsFrames = 0;
    private float fpsTimeLeft = FPS_UPDATE_INTERVAL;
    private float fps = 0;

    void Update()
    {
        fpsTimeLeft -= Time.deltaTime;
        fpsAccum += Time.timeScale / Time.deltaTime;
        fpsFrames++;

        if (fpsTimeLeft <= 0)
        {
            fps = fpsAccum / fpsFrames;
            fpsTimeLeft = FPS_UPDATE_INTERVAL;
            fpsAccum = 0;
            fpsFrames = 0;
        }
    }

    void OnGUI()
    {
        GUILayout.BeginArea(new Rect(5, 5, 500, 500));
        GUILayout.Label("Arrows: movement\nCtrl: flip car");
        GUILayout.Label("FPS: " + fps.ToString("f1"));
        GUILayout.EndArea();
    }
}