using System.Collections;
using System.Collections.Generic;

using UnityEngine;

public class ShakeCamera : MonoBehaviour
{
    public float shakeLevel = 3f;// 震动幅度
    public float setShakeTime = 0.5f;   // 震动时间
    public float shakeFps = 45f;    // 震动的FPS
    public bool isshakeCamera = false;// 震动标志
    private float fps;
    private float shakeTime = 0.0f;
    private float frameTime = 0.0f;
    private float shakeDelta = 0.005f;
    private Camera selfCamera;
    public void Init()
    {
        isshakeCamera = true;
        if (selfCamera == null)
        {
            selfCamera = this.gameObject.GetComponent<Camera>();
        }
        shakeTime = setShakeTime;
        fps = shakeFps;
        frameTime = 0.03f;
        shakeDelta = 0.005f;
    }
    void OnDisable()
    {
        if (selfCamera != null)
        {
            selfCamera.rect = new Rect(0.0f, 0.0f, 1.0f, 1.0f);
        }
        isshakeCamera = false;
    }
    void Update()
    {
        /*        if (Input.GetKeyDown(KeyCode.B))
                {
                    Init();
                }
        */
        if (isshakeCamera)
        {
            if (shakeTime > 0)
            {
                shakeTime -= Time.deltaTime;
                if (shakeTime <= 0)
                {
                    if (selfCamera != null)
                    {
                        selfCamera.rect = new Rect(0.0f, 0.0f, 1.0f, 1.0f);
                    }
                    isshakeCamera = false;
                    //enabled = false;
                }
                else
                {
                    frameTime += Time.deltaTime;
                    if (frameTime > 1.0 / fps)
                    {
                        frameTime = 0;
                        if (selfCamera != null)
                        {
                            if (selfCamera != null)
                            {
                                selfCamera.rect = new Rect(shakeDelta * (-1.0f + shakeLevel * Random.value),
                                shakeDelta * (-1.0f + shakeLevel * Random.value), 1.0f, 1.0f);
                            }
                        }
                    }
                }
            }
        }
        else
        {
            if (selfCamera != null)
            {
                if (selfCamera.rect != new Rect(0.0f, 0.0f, 1.0f, 1.0f))
                {
                    selfCamera.rect = new Rect(0.0f, 0.0f, 1.0f, 1.0f);
                }
            }
        }
    }
}