using UnityEngine;
using System.Collections;
 
public class NewBehaviourScript : MonoBehaviour {
 
 private bool onDrag = false; //是否被拖拽//  
 public float speed = 6f;  //旋轉速度//  
 private float tempSpeed;  //阻尼速度// 
 private float axisX = 1;
 //鼠標沿水平方向移動的增量//  
 private float axisY = 1;  //鼠標沿豎直方向移動的增量//  
 private float cXY;
 void OnMouseDown()
 {
 //接受鼠標按下的事件// 
 
 axisX = 0f; axisY = 0f;
 }
 void OnMouseDrag()   //鼠標拖拽時的操作// 
 {
 
 onDrag = true;
 axisX = -Input.GetAxis("moveX");
 //獲得鼠標增量// 
 axisY = Input.GetAxis("moveY");
 cXY = Mathf.Sqrt(axisX * axisX + axisY * axisY); //計算鼠標移動的長度//
 if (cXY == 0f) { cXY = 1f; }
 
 }
 float Rigid()   //計算阻尼速度//  
 {
 if (onDrag)
 {
  tempSpeed = speed;
 }
 else
 {
  if (tempSpeed > 0)
  {
  tempSpeed -= speed * 2 * Time.deltaTime / cXY; //通過除以鼠標移動長度實現(xiàn)拖拽越長速度減緩越慢// 
  }
  else { 
  tempSpeed = 0; 
  }
 }
 return tempSpeed;
 }
 
 void Update()
 {
 // this.transform.Rotate(new Vector3(axisY, axisX, 0) * Rigid(), Space.World); //這個是是按照之前方向一直慢速旋轉
 if (!Input.GetMouseButton(0))
 { 
  onDrag = false;
  this.transform.Rotate(new Vector3(axisY, axisX, 0)*0.5f, Space.World); 
 }
 }
}