unity虚拟摇杆 + 多点触控方案

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

using UnityEngine.EventSystems;
using UnityEngine.UI;

public class Rocker : MonoBehaviour {

    public RectTransform RockerPoint;       //触控点
    public RectTransform BottomPlane;       //触控盘父物体
    public RectTransform BottomImage;       //边框
    public RectTransform RockerEffect;      //特效显示(头朝上)
    private float DragRadius; //拖动半径
    private Vector2 RockerPointPosition; //触点坐标
    private Vector2 initPosition; //按下时坐标
    public static Vector2 RockerXY =new Vector2(0,0);       //摇杆坐标数据等同于Input.GetAxis (0~1) 
    private float DragMin = 0.015f;         //最小移动距离

    private void Start()
    {  //根据分辨率自适应摇杆区域大小
        RockerPointPosition = new Vector2(Screen.height * 0.2f, Screen.height * 0.2f);
        BottomPlane.position = RockerPointPosition;
        BottomPlane.sizeDelta = new Vector2(Screen.width * 0.3f, Screen.width * 0.3f);
        BottomImage.sizeDelta = new Vector2(Screen.width * 0.16f, Screen.width * 0.16f);
        RockerEffect.sizeDelta = BottomImage.sizeDelta * 0.9f;
        RockerPoint.sizeDelta = new Vector2(Screen.width * 0.03f, Screen.width * 0.03f);
        RockerPoint.localPosition = new Vector2(0,0);
        DragRadius = Screen.width * 0.05f; //拖动距离
        DragMin = Screen.width * DragMin;  //最小拖动半径
        BottomImage.GetComponent().color = new Color(1, 1, 1, 0);
        RockerEffect.GetComponent().color = new Color(1, 1, 1, 0);
    }
    
    ///

    /// 淡出淡如特效
    ///

    ///
    ///
    IEnumerator EffectAnime(bool start)
    { //我这里设置10帧
        int x1 = start ? 0 : 10;
        int x2 = start ? 10 : 0;
        do
        {
            if (x1 >= 6)
            { RockerPoint.GetComponent().color = new Color(1, 1, 1, x1 * 0.1f); }
            RockerEffect.GetComponent().color = new Color(1, 1, 1, x1 * 0.1f);
            BottomImage.GetComponent().color = new Color(1, 1, 1, x1 * 0.1f);
            x1 += start ? 1 : -1;
            yield return new WaitForSeconds(0.03f);
        }
        while (start ? x1 <= x2 : x1 >= x2);
    }

    ///

    /// 按下摇杆
    ///

    /// 触发物体
    public void ClickDown()
    {
        StartCoroutine("EffectAnime",true);
        initPosition = GetTouches(1);
        if (initPosition.x > RockerPointPosition.x & initPosition.y > RockerPointPosition.y)
        { BottomPlane.position = initPosition; }
    }

    ///

    /// 抬起摇杆
    ///

    public void ClickUP()
    {
        StartCoroutine("EffectAnime", false);
        RockerXY = new Vector2(0, 0);
        RockerPoint.localPosition = new Vector2(0, 0);
        BottomPlane.position = RockerPointPosition;
        TouchUp(1);
    }
    //拖动摇杆
    public void RockerDrag()
    {
        Vector2 dir = GameToolScript.tool.GetTouches(1) - initPosition;
        if (Mathf.Abs(dir.x) > DragMin | Mathf.Abs(dir.y) > DragMin)
        {
            RockerEffect.gameObject.SetActive(true);
            RockerPoint.localPosition = dir.normalized * DragRadius;
            RockerXY = RockerPoint.localPosition.normalized;
            Vector3 v = (RockerPoint.transform.position - BottomPlane.transform.position).normalized;
            RockerEffect.up= v;
        }
        else
        {
            RockerEffect.gameObject.SetActive(false);
            RockerPoint.localPosition = dir;
            RockerXY = new Vector2(0, 0);
        }
    }

    private List touchesList = new List { };
    ///

    /// 查找是哪个触点
    /// 适用于多点触控自动判定触点, 推荐放置于静态变量中
    ///

    /// 触摸的物体
    ///
    public Vector2 GetTouches(int touch)
    {
        int index = touchesList.IndexOf(touch);
        if (index > -1)
        {
            return Input.touches[index].position;
        }
        touchesList.Add(touch);
        return Input.touches[Input.touchCount - 1].position;
    }
    public void TouchUp(int touch)
    {
        touchesList.Remove(touch);
    }
}