【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") != 0 )
        {
            this.gameObject.transform.Translate(new Vector3(0,0,Input.GetAxis("Mouse ScrollWheel")*Time.deltaTime*view_value));
        }
        //移动视角
        if (Input.GetMouseButton (2)) {
            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=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 () {
    if( Input.GetAxis("Mouse ScrollWheel") != 0 )
        {
            this.gameObject.transform.Translate(new Vector3(0,0,Input.GetAxis("Mouse ScrollWheel")*Time.deltaTime*500));
        }
    //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<widthBorder)
            posTag = posTag | leftTag;
        if(msPos.y<heightBorder) 
            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); 
    }
        
    
}