unity3d实现LOL中的相机控制功能

using UnityEngine;
using System.Collections;

public class CameraController : MonoBehaviour {

    private int SightDistancespeed = 15;
    private bool CameraIsLock = false; //相机是否锁定
    private float RectSize = 50f; //矩形大小
    private float CameraMoveSpeed=0.5f; //相机移动速度
    private Transform Player; //player的Transform
    private float CamerafieldOfView=60; //相机的锥形视野范围
    private Camera camera; //相机

    //屏幕边缘四个矩形
    private Rect RectUp;
    private Rect RectDown;
    private Rect RectLeft;
    private Rect RectRight;
	void Start () {
        //实例化屏幕边缘的四个矩形出来
         RectUp = new Rect(0,Screen.height-RectSize,Screen.width,Screen.height);
         RectDown = new Rect(0,0,Screen.width,RectSize);
         RectLeft = new Rect(0,0,RectSize,Screen.width);
         RectRight = new Rect(Screen.width-RectSize,0,Screen.width,Screen.height);

	//在场景内查找Tag为Player的物体
         Player = GameObject.FindGameObjectWithTag("Player").transform;
		 
        
         camera = this.GetComponent();
	
	}
	
	
	void Update () {

        //如果按下Y键锁定相机再次按下解锁。
        if(Input.GetKeyDown(KeyCode.Y))
        {
            CameraIsLock = !CameraIsLock;
        }

        
        CameraMoveAndLock();//视角移动和锁定
        SightDistance();//视距的缩放
	  
	}
    //视角移动
    void CameraMoveAndLock()
    {
        //空格回到自己
        if (Input.GetKey(KeyCode.Space))
        {
            transform.position = new Vector3(Player.position.x, transform.position.y, Player.position.z - 5f);
        }
        //如果没有锁定相机（视野）可以移动
        if(CameraIsLock==false)
        {
            //如果鼠标在屏幕上的位置包含在这个矩形里
            if (RectUp.Contains(Input.mousePosition))
            {
                transform.position = new Vector3(transform.position.x, transform.position.y, transform.position.z + CameraMoveSpeed);
            }
            if (RectDown.Contains(Input.mousePosition))
            {
                transform.position = new Vector3(transform.position.x, transform.position.y, transform.position.z - CameraMoveSpeed);
            }
            if (RectLeft.Contains(Input.mousePosition))
            {
                transform.position = new Vector3(transform.position.x - CameraMoveSpeed, transform.position.y, transform.position.z);
            }
            if (RectRight.Contains(Input.mousePosition))
            {
                transform.position = new Vector3(transform.position.x + CameraMoveSpeed, transform.position.y, transform.position.z);
            }
            //判断相机移动的边缘在哪里，不能 超过设定的最远距离
            if (transform.position.z >= 70f)
            {
                transform.position = new Vector3(transform.position.x, transform.position.y, 70f);
            }
            if (transform.position.z <= -80f)
            {
                transform.position = new Vector3(transform.position.x, transform.position.y, -80f);
            }
            if (transform.position.x >= -5)
            {
                transform.position = new Vector3(-5, transform.position.y, transform.position.z);
            }
            if (transform.position.x <= -200f)
            {
                transform.position = new Vector3(-200, transform.position.y, transform.position.z);
            }
        }
        else if (CameraIsLock == true)
        {
            //如果锁定视角，相机视野显示主角
            transform.position = new Vector3(Player.position.x, transform.position.y, Player.position.z - 5f);
        }
        
    }


    //中键滑轮拉远拉近
    void SightDistance()
    {
        float MouseScrollWheel = Input.GetAxis("Mouse ScrollWheel");

        CamerafieldOfView += MouseScrollWheel * -SightDistancespeed;
        CamerafieldOfView = Mathf.Clamp(CamerafieldOfView, 30, 60);
        camera.fieldOfView = Mathf.Lerp(camera.fieldOfView, CamerafieldOfView, Time.deltaTime * SightDistancespeed);
       
    }
}