Unity3D实现物体旋转缩放移动效果

using UnityEngine;
using System.Collections;
 
public class ObjectControl : MonoBehaviour
{
 public Transform target;
 public float yawSensitivity = 80.0f;
 public float pitchSensitivity = 160.0f;
 public bool clampPitchAngle = true;
 public float pinchZoomSensitivity = 0.5f;//缩放速度
 public float smoothZoomSpeed = 10.0f;
 public float smoothOrbitSpeed = 20.0f;
 public float distance = 0;
 
 float yaw = 0;
 float pitch = 0;
 float idealYaw = 0;
 float idealPitch = 0;
 float fChangeScale = 0;
 float fChangeideal = 0;
 public Transform[] movementP;
 
 /// <summary>
 /// 控制模式枚举
 /// </summary>
 public enum ControlModel
 {
 Zoom, Rotate, Translate
 }
 
 public ControlModel controlModel = ControlModel.Rotate;
 
 //Vector3 position=new Vector3();
 public bool bArrive = false;//鼠标是否到达零件箱边界区域
 //平移方式是否根据鼠标拖动距离还是直接置为鼠标位置
 public bool ifDragMove = false;
 //平移方式为：根据鼠标拖动距离 时，评议的速度
 public float moveSpeed = 1.0f;
 //是够需要画出按钮（缩放、旋转、平移）
 public bool ifDrawBtn = true;
 //缩放方式改为：改变相机范围
 public bool zoomCamera = false;
 //zoomCamera = true ，相机的最小范围值
 public float minZoom = 0f;
 //zoomCamera = true ，相机的最大范围值
 public float maxZoom = 179f;
 //平移对象
 public Transform moveTarget;
 //平移对象的初始位置
 Vector3 moveTargetPos;
 //模型的直接父对象
 public Transform parentModel;
 Vector3 parentModelPos;
 
 void Start()
 {
 zoomCamera = true;
 }
 
 void OnEnable()
 {
 
 FingerGestures.OnDragMove += FingerGestures_OnDragMove;
 FingerGestures.OnPinchMove += FingerGestures_OnPinchMove;
 FingerGestures.OnFingerDragEnd += OnFingerDragEnd;
 
 }
 
 void OnDisable()
 {
 FingerGestures.OnDragMove -= FingerGestures_OnDragMove;
 FingerGestures.OnPinchMove -= FingerGestures_OnPinchMove;
 FingerGestures.OnFingerDragEnd -= OnFingerDragEnd;
 }
 
 public void setRotation()
 {
 Vector3 angles = target.eulerAngles;
 yaw = idealYaw = angles.y;
 pitch = idealPitch = angles.x;
 }
 
 void FingerGestures_OnDragMove(Vector2 fingerPos, Vector2 delta)
 {
 onDrag = true;
 try
 {
  Screen.showCursor = false;
 }
 catch
 {
  Screen.showCursor = false;
 }
 if (controlModel == ControlModel.Rotate && !bArrive)
 {
  idealYaw -= delta.x * yawSensitivity * 0.02f;
  idealPitch += delta.y * pitchSensitivity * 0.02f;
  len = delta;
  if (target) target.transform.Rotate(new Vector3(delta.y, -delta.x, 0), Space.World);
 }
 if (controlModel == ControlModel.Translate && !bArrive)
 {
  if (ifDragMove)
  {
  if (moveTarget == null)
  {
   target.position = new Vector3(target.position.x + delta.x * moveSpeed, target.position.y + delta.y * moveSpeed, target.localPosition.z);// GetWorldPos( fingerPos );
  }
  else
  {
   moveTarget.position = new Vector3(moveTarget.position.x + delta.x * moveSpeed, moveTarget.position.y + delta.y * moveSpeed, moveTarget.localPosition.z);
  }
  }
  else
  {
  if (moveTarget == null)
  {
   target.position = GetWorldPos(fingerPos);
  }
  else
  {
   moveTarget.position = GetWorldPos(fingerPos);
  }
  }
 }
 
 }
 
 void FingerGestures_OnPinchMove(Vector2 fingerPos1, Vector2 fingerPos2, float delta)
 {
 
 if (controlModel == ControlModel.Zoom && !bArrive)
 {
  if (zoomCamera)
  {
  float fZoom = camera.fieldOfView - delta * pinchZoomSensitivity * 800 * Time.deltaTime;
  fZoom = Mathf.Min(fZoom, maxZoom);
  fZoom = Mathf.Max(fZoom, minZoom);
  camera.fieldOfView = Mathf.Lerp(camera.fieldOfView, fZoom, Time.deltaTime * smoothZoomSpeed);
  // camera.transform.position = target.position - fZoom * camera.transform.forward;
  }
  else
  {
 
  fChangeScale = target.localScale.x + delta * pinchZoomSensitivity;
 
  Vector3 vc = new Vector3(fChangeScale, fChangeScale, fChangeScale);
  }
 }
 }
 //滑动结束
 void OnFingerDragEnd(int fingerIndex, Vector2 fingerPos)
 {
 Screen.showCursor = true;
 
 onDrag = false;
 }
 
 
 //把Unity屏幕坐标换算成3D坐标
 Vector3 GetWorldPos(Vector2 screenPos)
 {
 // Camera mainCamera = Camera.main;
 Camera mainCamera = GameObject.FindGameObjectWithTag("MainCamera").GetComponent<Camera>();
 if (!mainCamera.enabled)
 {
  mainCamera = mainCamera.transform.parent.FindChild("CameraOne").GetComponent<Camera>();
 }
 return mainCamera.ScreenToWorldPoint(new Vector3(screenPos.x, screenPos.y, Mathf.Abs(target.position.z - mainCamera.transform.position.z)));
 }
 
 void Apply()
 {
 if (controlModel == ControlModel.Rotate && !bArrive)
 {
  yaw = Mathf.Lerp(yaw, idealYaw, Time.deltaTime * smoothOrbitSpeed);
  pitch = Mathf.Lerp(pitch, idealPitch, Time.deltaTime * smoothOrbitSpeed);
 }
 }
 bool onDrag;
 Vector2 len;
 
 void LateUpdate()
 {
 if (Input.GetMouseButtonUp(1) || Input.GetMouseButtonUp(0))
 {
  Screen.showCursor = true;
 }
 Apply();
 }
 
 static float ClampAngle(float angle, float min, float max)
 {
 if (angle < -360)
  angle += 360;
 
 if (angle > 360)
  angle -= 360;
 
 return Mathf.Clamp(angle, min, max);
 }
 
 void Update()
 {
 ///自由切换
 
 if (Input.GetMouseButtonDown(0))
 {
 
  controlModel = ControlModel.Translate;
 }
 
 if (Input.GetMouseButtonDown(1))
 {
 
  controlModel = ControlModel.Rotate;
 }
 
 if (Input.GetAxis("Mouse ScrollWheel") != 0)
 {
  controlModel = ControlModel.Zoom;
 }
 
 }
 
 /// <summary>
 /// 复位
 /// </summary>
 public void ResetValue()
 {
 if (moveTarget != null)
 {
  moveTarget.localPosition = moveTargetPos;
 }
 if (parentModel != null)
 {
  parentModel.localPosition = parentModelPos;
 }
 yaw = 0;
 pitch = 0;
 idealYaw = 0;
 idealPitch = 0;
 }
 
}