unity中用鼠标控制物体实现缩放、平移、旋转

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class MouseMoveandScaleRotation : MonoBehaviour {

	public float rotationSpeed = 100; //设置旋转的速度
	public Transform PlayerTrans;    //设置空物体的位置
	public float maxh = 10;        //设置提升的最高高度

	enum RotationAxes {MouseXAndY,MouseX,MouseY}
	RotationAxes axes = RotationAxes.MouseXAndY;
	float sensitivityX = 15;
	float sensitivityY = 15;
	float minimumY = -80;
	float maximumY = 80;
	private float rotationY = 0;
	// Use this for initialization
	void Start () {

		PlayerTrans.position = PlayerTrans.position + new Vector3 (0, maxh, 0);   //提升空物体的位置，后面做旋转范围
	}
	
	// Update is called once per frame
	void Update () {

		if (Input.GetMouseButton (0)) {
		
			if (axes == RotationAxes.MouseXAndY) {
			
				float rotationX = transform.localEulerAngles.y + Input.GetAxis ("Mouse X") * sensitivityX;
				rotationY += Input.GetAxiis ("Mouse Y") * sensitivityY;
				rotationY = Mathf.Clamp (rotationY, mimimumY, maximumY);
				transform.localEulerAngles = new Vector3 (-rotationY, rotationX, 0);
			} 
			else if (axes == RotationAxes.MouseX) {
			
				transform.Rotate (0, Input.GetAxis ("Mouse X") * sensitivityY);
			}
			else {
			
				rotationY += Input.GetAxis ("Mouse Y") * sensitivityY;
				rotationY = Mathf.Clamp (rotationY, mimimumY, maximumY);
				transform.localEulerAngles = new Vector3 (-rotationY, transform.localEulerAnfles.y, 0);
			}
		}

		//通过鼠标滚轮实现场景缩放
		//鼠标滚轮的效果
		//Camera.main.fieldOfView    摄像机的视野
		//Camera.main.orthographicSize   摄像机的正交投影

		//Zoom out
		if (Input.GetAxis ("Mouse ScrollWheel") < 0) {
		
			if (Camera.main.fieldOfView <= 100)
				Camera.main.fieldOfView += 2;
			if (Camera.main.orthographicSize <= 20)
				Camera.main.orthographicSize -= 0.5f;
		}

		//右键旋转
		if (Input.GetMouseButton (1)) {
		
			float nor = Input.GetAxia ("Mouse X");  //获取鼠标的偏移量
			PlayerTrans.RotateAround(PlayerTrans.position,Vector3.up,Time.deltaTime*rotateSpeed*nor);  //每帧旋转空物体，相机也跟随旋转
		}
	}
}