FPS计算New

using UnityEngine;
using System.Collections;

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

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

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

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