【unity3D】鼠标控制camera的移动、放大（俯视浏览效果、LOL摄像机移动效果）

在Unity开发中，用鼠标滚轮来实现摄像机的视野范围，鼠标左键拖拉控制摄像机的移动，代码如下：

1.俯视浏览效果

 using UnityEngine;
 using System.Collections;

 public class CameraCol : MonoBehaviour {
     //控制视野缩放的速率
     public float view_value;
     //控制摄像机移动的速率
     public float move_speed;
     void Update () {
         //放大、缩小
         if( Input.GetAxis("Mouse ScrollWheel") !=  )
         {
             this.gameObject.transform.Translate(new Vector3(,,Input.GetAxis("Mouse ScrollWheel")*Time.deltaTime*view_value));
         }
         //移动视角
         if (Input.GetMouseButton ()) {
             transform.Translate (Vector3.left * Input.GetAxis ("Mouse X") * move_speed);
             transform.Translate(Vector3.up * Input.GetAxis("Mouse Y") * -move_speed);
         }
     }
 }

2.LOL摄像机效果

　　鼠标移至屏幕边控向相应位置移动

 //整体移动速度
 var speed=; 

 //关于鼠标滑轮的参数
 var MouseWheelSensitivity = 0.0001f;
 var MouseZoomMin = -2.4f;
 var MouseZoomMax = 1.0f;
 var normalDistance = -1.1; 

 //水平和垂直的移动速度
 var horizontalMoveSpeed = 0.1;
 var verticalMoveSpeed = 0.1; 

 //上左下右的标记
 var topTag = ;
 var leftTag = ;
 var botTag = ;
 var rightTag = ;

 function Start () {

 }

 function Update () {
     if( Input.GetAxis("Mouse ScrollWheel") !=  )
         {
             this.gameObject.transform.Translate(new Vector3(,,Input.GetAxis("Mouse ScrollWheel")*Time.deltaTime*));
         }
     //获取cursor坐标
     var msPos = Input.mousePosition;

     //边界最小值
     var widthBorder = Screen.width/;
     var heightBorder = Screen.height/; 

     var x = 0.0f;
     var y = 0.0f; 

     //当前鼠标位置标记
     var posTag = ; 

     if(widthBorder<=msPos.x && msPos.x<=Screen.width-widthBorder &&
         heightBorder<=msPos.y && msPos.y<=Screen.height-heightBorder)
     {
         transform.Translate(x,y,y);
         Debug.Log("asd"+msPos.x+" "+msPos.y);
     }
     else
     {
     //  posTag
     //
     // 1100 | 1000 | 1001
     // 0100 | 0000 | 0001
     // 0110 | 0010 | 0011
     //
     // 12   |  8   |  9
     // 4    |  0   |  1
     // 6    |  2   |  3
     //
         if(msPos.y>Screen.height-heightBorder)
             posTag = posTag | topTag;
         if(msPos.x<widthBorder)
             posTag = posTag | leftTag;
         if(msPos.y<heightBorder)
             posTag = posTag | botTag;
         if(msPos.x>Screen.width-widthBorder)
             posTag = posTag | rightTag;

         switch(posTag)
         {
         case : break;
         case : x = horizontalMoveSpeed; break;
         case : y = -verticalMoveSpeed; break;
         case : x = horizontalMoveSpeed; y = -verticalMoveSpeed; break;
         case : x = -horizontalMoveSpeed; break;
         case : x = -horizontalMoveSpeed; y = -verticalMoveSpeed; break;
         case : y = verticalMoveSpeed; break;
         case : x = horizontalMoveSpeed; y = verticalMoveSpeed; break;
         case :x = -horizontalMoveSpeed;y = verticalMoveSpeed; break;
         default: break;
         }

         x *= speed*Time.deltaTime;
         y *= speed*Time.deltaTime;

         //
         transform.Translate(x, y, y);
     }

 }