UGUI实现的变速摇杆

去年刚刚结束UGUI，想做个贪吃蛇小游戏~

结果当然是跟大多数程序猿一样，实现了核心操作逻辑，后面就不了了之了。

但是昨天网上看到个跟我这个demo一模一样的帖子，我贪吃蛇的蛇头还被抄袭了，这真是不能忍了，还是把原版放出来好了~

---效果图点这里---

这么朴实的中文+拼音的编程风格恐怕就我好意思用了。

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

public class JoyPlayerCtrl : MonoBehaviour
{
    public enum AxisOption
    {
        Both, // Use both
        OnlyHorizontal, // Only horizontal
        OnlyVertical // Only vertical
    }

    public JoystickInput mJoystick;
    public int 距离Max = 100;
    public AxisOption axesToUse = AxisOption.Both;
    bool m_UseX; // Toggle for using the x axis
    bool m_UseY; // Toggle for using the Y axis

    Vector3 StartPos;
    Vector3 FirstPos;

    Image IMGBG;
    public Image IMGCheck;

    public static JoyPlayerCtrl Instance;
    void Awake()
    {
        Instance = this;

        IMGBG = GetComponent<Image>();
        m_UseX = (axesToUse == AxisOption.Both || axesToUse == AxisOption.OnlyHorizontal);
        m_UseY = (axesToUse == AxisOption.Both || axesToUse == AxisOption.OnlyVertical);

        mJoystick = new JoystickInput();
        mJoystick.距离Max = 距离Max;
        StartPos = transform.localPosition;
        OnPointerUp();
    }

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Mouse0))
        {
            OnPointerDown(new Vector2(Input.mousePosition.x, Input.mousePosition.y));
        }
        if (Input.GetKey(KeyCode.Mouse0))
        {
            OnDragDuan(new Vector2(Input.mousePosition.x, Input.mousePosition.y));
        }
        if (Input.GetKeyUp(KeyCode.Mouse0))
        {
            OnPointerUp();
        }
    }

    /// <summary>
    /// 首次按下
    /// </summary>
    /// <param name="mousePos"></param>
    public void OnPointerDown(Vector2 mousePos)
    {
        IMGBG.enabled = true;
        IMGCheck.enabled = true;
        mJoystick.isUser = true;
        IMGCheck.transform.localPosition = Vector3.zero;

        FirstPos = mousePos;
        transform.localPosition = new Vector3(mousePos.x - Screen.width / 2, mousePos.y - Screen.height / 2, StartPos.z);
    }

    /// <summary>
    /// 弹起
    /// </summary>
    public void OnPointerUp()
    {
        IMGBG.enabled = false;
        IMGCheck.enabled = false;
        mJoystick.isUser = false;
    }

    /// <summary>
    /// 拖动
    /// </summary>
    /// <param name="DragPos"></param>
    void OnDragDuan(Vector3 DragPos)
    {
        Vector3 方向v3 = (DragPos - FirstPos).normalized;
        if (方向v3 != Vector3.zero)
        {
            mJoystick.方向 = Quaternion.LookRotation(方向v3, new Vector3(0, 0, -1));
            mJoystick.距离 = Mathf.Clamp(Vector3.Distance(DragPos, FirstPos), 0, mJoystick.距离Max);
            IMGCheck.transform.localPosition = mJoystick.方向 * Vector3.forward * mJoystick.距离;
        }
    }

    public class JoystickInput
    {
        public bool isUser;
        public Quaternion 方向;
        public float 距离;
        public float 距离Max;

        public float get力度()
        {
            return 距离 / 距离Max;
        }
        public Quaternion getY方向()
        {
            Quaternion temp = JoyPlayerCtrl.Instance.mJoystick.方向 * Quaternion.Euler(90,0,0);
            return Quaternion.Euler(0, -temp.eulerAngles.z, 0);
        }
    }

    void OnGUI()
    {
        if (mJoystick.isUser)
        {
            GUI.Label(new Rect(10, 10, 200, 30), "方向" + mJoystick.方向.eulerAngles.ToString());
            GUI.Label(new Rect(10, 50, 200, 30), "距离" + mJoystick.距离);
            GUI.Label(new Rect(10, 90, 200, 30), "力度" + mJoystick.get力度());
        }
    }
}

场景布置结构如下：