Unity---自制游戏中控制角色的移动摇杆

目录

• 1、摇杆界面制作
• 2、代码

1、摇杆界面制作

简单摇杆图片下载
链接：https://pan.baidu.com/s/1H3V7Nw2tfGwO33S6ijwtvw
提取码：7dtf

2、代码

摇杆监听事件，单独写一个类（可复用）

using System;
using UnityEngine;
using UnityEngine.EventSystems;

//后面三个为Unity的按下、按起、拖拽的事件接口

/// <summary>
/// 监听事件脚本单独写出，使用时可以直接添加，提高复用性
/// </summary>
public class RockerListener : MonoBehaviour,IPointerDownHandler,IPointerUpHandler,IDragHandler
{
	//定义3个action委托
    public Action<PointerEventData> onPointerDown;
    public Action<PointerEventData> onPointerUp;
    public Action<PointerEventData> onDrag;

    //这三个事件分别在鼠标按下、鼠标抬起、鼠标拖拽时触发
    public void OnPointerDown(PointerEventData eventData)
    {
        if (onPointerDown != null)
        {
            onPointerDown(eventData);
        }
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        if (onPointerUp != null)
        {
            onPointerUp(eventData);
        }
    }

    public void OnDrag(PointerEventData eventData)
    {
        if (onDrag != null)
        {
            onDrag(eventData);
        }
    }

}

挂载在摇杆上的具体类

using System;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class RockerTest : MonoBehaviour 
{
	//有效点击区域、外摇杆、内摇杆
    private GameObject rockerRange;
    private GameObject clickOutImg;
    private GameObject clickInImg;

	//摇杆默认位置、点击位置、内外摇杆最大距离差
    private Vector2 defaultPos;
    private Vector2 clickPos;
    private float maxDistance = 50;


    private void Start(){
        InitGO();
        InitListener();
	}
	private void Update(){
		
	}

    /// <summary>
    /// 初始化游戏物体对象
    /// </summary>
    private void InitGO()
    {
        rockerRange = this.gameObject;
        clickOutImg = transform.Find("clickOutImg").gameObject;
        clickInImg = transform.Find("clickOutImg/clickInImg").gameObject;
        defaultPos = clickOutImg.transform.position;
    }
    /// <summary>
    /// 初始化摇杆监听事件
    /// </summary>
    private void InitListener()
    {
        RockerListener listener = GetOrAddComponent<RockerListener>(rockerRange);
        //鼠标按下时移动到按下的位置
        listener.onPointerDown = (PointerEventData data) =>
        {
            clickOutImg.transform.position = data.position;
            clickPos = data.position;
        };
        //抬起时回到原位
        listener.onPointerUp = (PointerEventData data) =>
        {
            clickOutImg.transform.position = defaultPos;
            clickInImg.transform.localPosition = Vector2.zero;
        };
        //拖拽时小摇杆在大摇杆的一定范围内移动
        listener.onDrag = (PointerEventData data) =>
        {
            Vector2 dir = data.position - clickPos;
            float len = dir.magnitude;
            if (len >= maxDistance)
            {
                //限制内摇杆的最大移动距离
                Vector2 limitDistance = Vector2.ClampMagnitude(dir, maxDistance);
                clickInImg.transform.position = clickPos + limitDistance;
            }
            else
            {
                clickInImg.transform.position = data.position;
            }
        };
    }

    /// <summary>
    /// 得到或添加T组件到物体上（限制T范围为component）
    /// </summary>
    private T GetOrAddComponent<T>(GameObject go) where T : Component
    {
        T t = go.GetComponent<T>();
        if (t == null)
        {
            t = go.AddComponent<T>();
        }

        return t;
    }
}