1 using UnityEngine;
2 using System.Collections;
3 /*
4 * 摄像机视野远近的控制
5 */
6 public class CameraCS : MonoBehaviour {
7
8 private Transform player;
9 private Vector3 offsetPosition;
10 private float distance;
11 private float scrollSpeed = 10; //鼠标滚轮速度
12 // Use this for initialization
13
14 void Awake(){
15 player = GameObject.FindGameObjectWithTag ("Player").transform;
16 }
17
18 void Start () {
19 //摄像机朝向player
20 transform.LookAt (player.position);
21 //获取摄像机与player的位置偏移
22 offsetPosition = transform.position - player.position;
23 }
24
25 // Update is called once per frame
26 void Update () {
27 //摄像机跟随player与player保持相对位置偏移
28 transform.position = offsetPosition + player.position;
29 ScrollView ();
30 }
31
32 void ScrollView(){
33 //返回位置偏移的向量长度
34 distance = offsetPosition.magnitude;
35
36 //根据鼠标滚轮的前后移动获取变化长度
37 distance -= Input.GetAxis ("Mouse ScrollWheel") * scrollSpeed;
38
39 //限制变化长度的范围在最小为4最大为22之间
40 distance = Mathf.Clamp (distance,4,22);
41
42 //新的偏移值为偏移值的单位向量*变换长度
43 offsetPosition = offsetPosition.normalized * distance;
44
45 //打印变化长度
46 Debug.Log (distance);
47 }
48 }
