Unity教程之-UGUI实现操纵摇杆

转自http://www.unity.5helpyou.com/3226.html

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，比较出色的摇杆插件《Easy Touch》（很强大），还是主要讲讲我们自己怎么做。

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。
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）：

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

EventTriggerListener：在NGUI开发的时候处理事件都会用到UIEventListener，我们已经用的习惯的不得了，而UGUI则不是这种机制，

并且我觉得这种是最合理的方式，所以自己写一套类似的。

只是一个帮助类，不需要挂在任何的游戏对象上。

JoystackCc：这是主要来控制摇杆的。

挂在JoystackControl节点上

PlayerMoveControl：这是主要来通过摇杆来控制角色的。

挂在你想控制的物体上

直接上代码，写了注释，就不哔哔了。

EventTriggerListener.cs

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{
public delegate void VoidDelegate (GameObject go);
public delegate void VectorDelegate(GameObject go, Vector2 delta);
public VoidDelegate onClick;
public VoidDelegate onDown;
public VoidDelegate onEnter;
public VoidDelegate onExit;
public VoidDelegate onUp;
public VoidDelegate onSelect;
public VoidDelegate onUpdateSelect;

public VectorDelegate onDrag;
public VoidDelegate onDragOut;

static public 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;
}
}

public override void OnDrag(PointerEventData eventData)
{
if (onDrag != null) onDrag(gameObject, eventData.delta);
}

public override void OnEndDrag(PointerEventData eventData)
{
if (onDragOut != null) onDragOut(gameObject);
}

public override void OnPointerClick(PointerEventData eventData)
{
if(onClick != null)  onClick(gameObject);
}
public override void OnPointerDown (PointerEventData eventData){
if(onDown != null) onDown(gameObject);
}
public override void OnPointerEnter (PointerEventData eventData){
if(onEnter != null) onEnter(gameObject);
}
public override void OnPointerExit (PointerEventData eventData){
if(onExit != null) onExit(gameObject);
}
public override void OnPointerUp (PointerEventData eventData){
if(onUp != null) onUp(gameObject);
}
public override void OnSelect (BaseEventData eventData){
if(onSelect != null) onSelect(gameObject);
}
public override void OnUpdateSelected (BaseEventData eventData){
if(onUpdateSelect != null) onUpdateSelect(gameObject);
}
}

JoystackCc.cs

using UnityEngine;
using System.Collections;

public class JoystackCc : MonoBehaviour {
private Vector3 Origin;

Transform mTrans;

private Vector3 _deltaPos;
private bool _drag = false;

private Vector3 deltaPosition;

float dis;
[SerializeField]
private float MoveMaxDistance = 80;             //最大拖动距离

[HideInInspector]
public Vector3 FiexdMovePosiNorm; //固定8个角度移动的距离

[HideInInspector]
public Vector3 MovePosiNorm;  //标准化移动的距离
[SerializeField]
private float ActiveMoveDistance = 1;               //激活移动的最低距离
void Awake()
{
EventTriggerListener.Get(gameObject).onDrag = OnDrag;
EventTriggerListener.Get(gameObject).onDragOut = OnDragOut;

EventTriggerListener.Get(gameObject).onDown = OnMoveStart;
}

// Use this for initialization
void Start () {
Origin = transform.localPosition; //设置原点
mTrans = transform;
}

// Update is called once per frame
void Update()
{
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;
}
void MiouseDown()
{
if ((Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Moved))
{
}
else
mTrans.localPosition = Origin;
}
Vector3 result;
private Vector3 _checkPosition(Vector3 movePos, Vector3 _offsetPos)
{
result = movePos + _offsetPos;
return result;
}

void OnDrag(GameObject go, Vector2 delta)
{
if (!_drag)
{
_drag = true;
}
_deltaPos = delta;

mTrans.localPosition += new Vector3(_deltaPos.x, _deltaPos.y, 0);
}

void OnDragOut(GameObject go)
{
_drag = false;
mTrans.localPosition = Origin;
if (PlayerMoveControl.moveEnd != null) PlayerMoveControl.moveEnd();
}

void OnMoveStart(GameObject go)
{
if (PlayerMoveControl.moveStart != null) PlayerMoveControl.moveStart();
}
}

PlayerMoveControl.cs

using UnityEngine;
using System.Collections;

public class PlayerMoveControl : MonoBehaviour {
private Transform _mTransform;
public JoystackCc _mJoystackCc;

public float moveSpeed = 50;

public delegate void MoveDelegate();
public static MoveDelegate moveEnd;
public static MoveDelegate moveStart;
public static PlayerMoveControl Instance;
// Use this for initialization
void Awake()
{
Instance = this;
_mTransform = transform;

moveEnd = OnMoveEnd;
moveStart = OnMoveStart;
}
void Start () {

}
void OnMoveEnd()
{
_turnBase = false;
}

void OnMoveStart()
{
_turnBase = true;
}

// Update is called once per frame
private float angle;
private bool _turnBase = false;
void Update()
{
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

Unity教程之-UGUI实现操纵摇杆

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