UGUI实现unity摇杆

http://www.winig.cc/archives/348

好久没有写文章了，最近在做项目是用的unity最新的ui系统UGUI，项目需要做一个摇杆，网上大部分都是用的插件和NGUI做的摇杆，unity自带的摇杆也不怎么好用，而最新的unity4.6.x来了，加入了最新的UI系统“UGUI”，那我们怎么用UGUI来制作摇杆呢~大神勿喷，本人是技术渣渣。

还是主要讲讲我们自己怎么做。

1. 首先在unity场景里面新建一个空物体和两个Image，把空物体放在创建Image自动生成的Canvas里面，再把两个Image放在空物体里

   Image建立方式：GameObject->UI->Image   或者直接在“Hierarchy”右键然后UI->Image，看喜好。

   空物体和两个Image的命名看个人喜好。

   威恩的节点是这样的：

   节点中的joystack是刚刚建立的空节点。

   Backgound是摇杆的背景。

   JoystackControl是真实的可以拖动的摇杆。

2. 把Backgound和JoystackControl的SourceImage替换成自己喜欢的图片，并且把JoystackControl的图片缩小点，这里我就用系统自带的图片了，威恩这两个节点的inspector如下（我修改过得地方用红框标注了，其他都没改）：

   最终样子如下：

3. 那么样子有了就需要让他动起来，需要三个类“EventTriggerListener”、“JoystackCc”、“PlayerMoveControl”。

   直接上代码，写了注释，就不哔哔了。

   EventTriggerListener.cs

4. 
   
   using UnityEngine;
   
   using System.Collections;
   
   using UnityEngine.EventSystems;
   
   using System.Collections.Generic;
   
   /// <summary>
   
   /// UGUI事件监听类
   
   /// </summary>
   
   public class EventTriggerListener : UnityEngine.EventSystems.EventTrigger{
   
   	publicdelegate void VoidDelegate (GameObject go);
   
   	publicdelegate void VectorDelegate(GameObject go, Vector2 delta);
   
   	publicVoidDelegate onClick;
   
   	publicVoidDelegate onDown;
   
   	publicVoidDelegate onEnter;
   
   	publicVoidDelegate onExit;
   
   	publicVoidDelegate onUp;
   
   	publicVoidDelegate onSelect;
   
   	publicVoidDelegate onUpdateSelect;
   
   	publicVectorDelegate onDrag;
   
   	publicVoidDelegate onDragOut;
   
   	staticpublic EventTriggerListener Get (GameObject go)
   
   	{
   
   		if(go==null){
   
   			Debug.LogError("EventTriggerListener_go_is_NULL");
   
   			return null;
   
   		}
   
   		else{
   
   			EventTriggerListener listener = go.GetComponent<EventTriggerListener>();
   
   			if (listener == null) listener = go.AddComponent<EventTriggerListener>();
   
   			return listener;
   
   		}
   
   	}
   
   	publicoverride void OnDrag(PointerEventData eventData)
   
   	{
   
   		if(onDrag != null) onDrag(gameObject, eventData.delta);
   
   	}
   
   	publicoverride void OnEndDrag(PointerEventData eventData)
   
   	{
   
   		if(onDragOut != null) onDragOut(gameObject);
   
   	}
   
   	publicoverride void OnPointerClick(PointerEventData eventData)
   
   	{
   
   		if(onClick !=null)  onClick(gameObject);
   
   	}
   
   	publicoverride void OnPointerDown (PointerEventData eventData){
   
   		if(onDown !=null) onDown(gameObject);
   
   	}
   
   	publicoverride void OnPointerEnter (PointerEventData eventData){
   
   		if(onEnter !=null) onEnter(gameObject);
   
   	}
   
   	publicoverride void OnPointerExit (PointerEventData eventData){
   
   		if(onExit !=null) onExit(gameObject);
   
   	}
   
   	publicoverride void OnPointerUp (PointerEventData eventData){
   
   		if(onUp !=null) onUp(gameObject);
   
   	}
   
   	publicoverride void OnSelect (BaseEventData eventData){
   
   		if(onSelect !=null) onSelect(gameObject);
   
   	}
   
   	publicoverride void OnUpdateSelected (BaseEventData eventData){
   
   		if(onUpdateSelect !=null) onUpdateSelect(gameObject);
   
   	}
   
   } 

5. JoystackCc.cs

6. using UnityEngine;
   
   using System.Collections;
   
   public class JoystackCc : MonoBehaviour {
   
   	privateVector3 Origin;
   
   	Transform mTrans;
   
   	privateVector3 _deltaPos;
   
   	privatebool _drag = false;
   
   	privateVector3 deltaPosition;
   
   	floatdis;
   
   	[SerializeField]
   
   	privatefloat MoveMaxDistance = 80;            //最大拖动距离
   
   	[HideInInspector]
   
   	publicVector3 FiexdMovePosiNorm; //固定8个角度移动的距离
   
   	[HideInInspector]
   
   	publicVector3 MovePosiNorm;  //标准化移动的距离
   
   	[SerializeField]
   
   	privatefloat ActiveMoveDistance = 1;              //激活移动的最低距离
   
   	voidAwake()
   
   	{
   
   		EventTriggerListener.Get(gameObject).onDrag = OnDrag;
   
   		EventTriggerListener.Get(gameObject).onDragOut = OnDragOut;
   
   		EventTriggerListener.Get(gameObject).onDown = OnMoveStart;
   
   	}
   
   	// Use this for initialization
   
   	voidStart () {
   
   		Origin = transform.localPosition;//设置原点
   
   		mTrans = transform;
   
   	}
   
   	// Update is called once per frame
   
   	voidUpdate()
   
   	{
   
   		dis = Vector3.Distance(transform.localPosition, Origin);//拖动距离，这不是最大的拖动距离，是根据触摸位置算出来的
   
   		if(dis >= MoveMaxDistance)       //如果大于可拖动的最大距离
   
   		{
   
   			Vector3 vec = Origin + (transform.localPosition - Origin) * MoveMaxDistance / dis;  //求圆上的一点：(目标点-原点) * 半径/原点到目标点的距离
   
   			transform.localPosition = vec;
   
   		}
   
   		if(Vector3.Distance(transform.localPosition, Origin) > ActiveMoveDistance) //距离大于激活移动的距离
   
   		{
   
   			MovePosiNorm = (transform.localPosition - Origin).normalized;
   
   			MovePosiNorm = new Vector3(MovePosiNorm.x, 0, MovePosiNorm.y);
   
   		}
   
   		else
   
   			MovePosiNorm = Vector3.zero;
   
   	}
   
   	voidMiouseDown()
   
   	{
   
   		if((Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Moved))
   
   		{
   
   		}
   
   		else
   
   			mTrans.localPosition = Origin;
   
   	}
   
   	Vector3 result;
   
   	privateVector3 _checkPosition(Vector3 movePos, Vector3 _offsetPos)
   
   	{
   
   		result = movePos + _offsetPos;
   
   		returnresult;
   
   	}
   
   	voidOnDrag(GameObject go, Vector2 delta)
   
   	{
   
   		if(!_drag)
   
   		{
   
   			_drag = true;
   
   		}
   
   		_deltaPos = delta;
   
   		mTrans.localPosition +=new Vector3(_deltaPos.x, _deltaPos.y, 0);
   
   	}
   
   	voidOnDragOut(GameObject go)
   
   	{
   
   		_drag =false;
   
   		mTrans.localPosition = Origin;
   
   		if(PlayerMoveControl.moveEnd != null) PlayerMoveControl.moveEnd();
   
   	}
   
   	voidOnMoveStart(GameObject go)
   
   	{
   
   		if(PlayerMoveControl.moveStart != null) PlayerMoveControl.moveStart();
   
   	}
   
   }

7. PlayerMoveControl.cs

8. using UnityEngine;
   
   using System.Collections;
   
   public class PlayerMoveControl : MonoBehaviour {
   
   	privateTransform _mTransform;
   
   	publicJoystackCc _mJoystackCc;
   
   	publicfloat moveSpeed = 50;
   
   	publicdelegate void MoveDelegate();
   
   	publicstatic MoveDelegate moveEnd;
   
   	publicstatic MoveDelegate moveStart;
   
   	publicstatic PlayerMoveControl Instance;
   
   	// Use this for initialization
   
   	voidAwake()
   
   	{
   
   		Instance =this;
   
   		_mTransform = transform;
   
   		moveEnd = OnMoveEnd;
   
   		moveStart = OnMoveStart;
   
   	}
   
   	voidStart () {
   
   	}
   
   	voidOnMoveEnd()
   
   	{
   
   		_turnBase =false;
   
   	}
   
   	voidOnMoveStart()
   
   	{
   
   		_turnBase =true;
   
   	}
   
   	// Update is called once per frame
   
   	privatefloat angle;
   
   	privatebool _turnBase = false;
   
   	voidUpdate()
   
   	{
   
   		if(_turnBase)
   
   		{
   
   			Vector3 vecMove = _mJoystackCc.MovePosiNorm*Time.deltaTime*moveSpeed/10;
   
   			_mTransform.localPosition+=vecMove;
   
   			angle = Mathf.Atan2 (_mJoystackCc.MovePosiNorm.x, _mJoystackCc.MovePosiNorm.z) * Mathf.Rad2Deg - 10;
   
   			_mTransform.localRotation = Quaternion.Euler(Vector3.up*angle);
   
   		}
   
   	}
   
   }

   建好这三个类之后，把他们绑定到相应的节点上。都挂在哪，代码上面有写

9. 测试一下，威恩新建了一个cube来作为测试对象，加了个plane作为“伪”地面，太黑了再打个灯….

   下面是测试效果：

如果有任何问题直接留言~尽自己所能帮忙解决~