Unity 移动摄像机的脚本(类似于魔兽争霸， LOL的摄像机移动方式)

类似LOL、魔兽争霸摄像机的移动， 

当鼠标移动到窗口上下左右边界的时候， 移动摄像机。 

将屏幕分为9份， 每一份一个标记， 标记划分参考计算机图形学

 //整体移动速度
 var speed=5;

 //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 = 8;
 var leftTag = 4;
 var botTag = 2;
 var rightTag = 1;

 function Start () {

 }

 function Update () {

     //获取cursor坐标
     var msPos = Input.mousePosition;

     //边界最小值
     var widthBorder = Screen.width/50;
     var heightBorder = Screen.height/50;

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

     //当前鼠标位置标记
     var posTag = 0;

     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
             posTag = posTag | leftTag;
         if(msPos.y
             posTag = posTag | botTag;
         if(msPos.x>Screen.width-widthBorder)
             posTag = posTag | rightTag;

         switch(posTag)
         {
         case 0: break;
         case 1: x = horizontalMoveSpeed; break;
         case 2: y = -verticalMoveSpeed; break;
         case 3: x = horizontalMoveSpeed; y = -verticalMoveSpeed; break;
         case 4: x = -horizontalMoveSpeed; break;
         case 6: x = -horizontalMoveSpeed; y = -verticalMoveSpeed; break;
         case 8: y = verticalMoveSpeed; break;
         case 9: x = horizontalMoveSpeed; y = verticalMoveSpeed; break;
         case 12:x = -horizontalMoveSpeed;y = verticalMoveSpeed; break;
         default: break;
         }

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

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


 }