控制模型展示视角

  1 using UnityEngine;
  2 using System.Collections;
  3 
  4 public class CameraControl : MonoBehaviour {
  5     public Transform target;
  6     public float distance = 5f;//缩放系数
  7     public float mixdistance = 2;//摄像机离物体的最近距离，越小放大倍数越大
  8     public float maxdistance = 10;//摄像机离物体的最远距离，越大缩小程度越高
  9 
 10     public float xSpeed = 250.0f;
 11     public float ySpeed = 120.0f;
 12 
 13     public float yMinLimit = -80;//角度限制系数
 14     public float yMaxLimit = 80;
 15 
 16     public float x = 0.0f;//摄像头的位置
 17     public float y = 0.0f;
 18     private Vector2 oldPosition1;
 19     private Vector2 oldPosition2;
 20     // Use this for initialization
 21     void Start () {
 22         Vector3 angles = transform.eulerAngles;
 23         x = angles.y;
 24         y = angles.x;
 25         //this.transform.position = target.transform.position + new Vector3(0,0,2);//赋予摄像头位置
 26 
 27         // Make the rigid body not change rotation
 28         if (GetComponent< Rigidbody >())
 29             GetComponent< Rigidbody >().freezeRotation = true;
 30     }
 31 
 32 
 33     // Update is called once per frame
 34     void Update()
 35     {
 36         if (Input.touchCount == 1)
 37         {
 38 
 39             if (Input.GetTouch(0).phase == TouchPhase.Moved)
 40             {
 41 
 42                 x += Input.GetAxis("Mouse X") * xSpeed * 0.02f;
 43                 y -= Input.GetAxis("Mouse Y") * ySpeed * 0.02f;
 44 
 45             }
 46         }
 47 
 48 
 49         if (Input.touchCount > 1)
 50         {
 51 
 52             if (Input.GetTouch(0).phase == TouchPhase.Moved || Input.GetTouch(1).phase == TouchPhase.Moved)
 53             {
 54 
 55                 var tempPosition1 = Input.GetTouch(0).position;
 56                 var tempPosition2 = Input.GetTouch(1).position;
 57                 if (isEnlarge(oldPosition1, oldPosition2, tempPosition1, tempPosition2))
 58                 {
 59                     if (distance > mixdistance)
 60                     {
 61                         distance -= 0.5f;
 62                     }
 63                 }
 64                 else
 65                 {
 66                     if (distance < maxdistance)
 67                     {
 68                         distance += 0.5f;
 69                     }
 70                 }
 71                 oldPosition1 = tempPosition1;
 72                 oldPosition2 = tempPosition2;
 73             }
 74         }
 75     }
 76 bool  isEnlarge(Vector2 oP1, Vector2 oP2,Vector2 nP1, Vector2 nP2)
 77 {
 78     var leng1 = Mathf.Sqrt((oP1.x - oP2.x) * (oP1.x - oP2.x) + (oP1.y - oP2.y) * (oP1.y - oP2.y));
 79     var leng2 = Mathf.Sqrt((nP1.x - nP2.x) * (nP1.x - nP2.x) + (nP1.y - nP2.y) * (nP1.y - nP2.y));
 80     if(leng1<leng2)
 81     {
 82          return true; 
 83     }else
 84     {
 85         return false; 
 86     }
 87 }
 88     void LateUpdate()
 89     {
 90         if (target)
 91         {
 92 
 93             y = ClampAngle(y, yMinLimit, yMaxLimit);
 94             var rotation = Quaternion.Euler(y, x, 0);
 95             var position = rotation * new Vector3(0.0f, 0.0f, -distance) + target.position;
 96 
 97             transform.rotation = rotation;
 98             transform.position = position;
 99         }
100     }
101    static float ClampAngle(float angle,float min,float max)
102     {
103         if (angle < -360)
104             angle += 360;
105         if (angle > 360)
106             angle -= 360;
107         return Mathf.Clamp(angle, min, max);
108     }
109 }