unity3d简单的震屏效果

using UnityEngine;
using System.Collections;
public class SC_shakeCamera : MonoBehaviour {

private float shakeTime = 0.0f;
private float fps= 20.0f;
private float frameTime =0.0f;
private float shakeDelta =0.005f;
public Camera cam ;
public static bool isshakeCamera =false;
// Use this for initialization
void Start ()
{
shakeTime = 1.0f;
fps= 20.0f;
frameTime =0.03f;
shakeDelta =0.005f;

}

// Update is called once per frame
void Update ()
{
if (isshakeCamera)
{
if(shakeTime > 0)
{
shakeTime -= Time.deltaTime;
if(shakeTime <= 0)
{
cam.rect = new Rect(0.0f,0.0f,1.0f,1.0f);
isshakeCamera =false;
shakeTime = 1.0f;
fps= 20.0f;
frameTime =0.03f;
shakeDelta =0.005f;
}
else
{
frameTime += Time.deltaTime;

if(frameTime > 1.0 / fps)
{
frameTime = 0;
cam.rect = new Rect(shakeDelta * ( -1.0f + 2.0f * Random.value),shakeDelta * ( -1.0f + 2.0f * Random.value), 1.0f, 1.0f);

}
}
}
}

}

public static void shakeCamera()
{
isshakeCamera =true;
}
}