增加skill、加入界面基础加载

Assets/Scripts/UI/VirtualJoystick.cs

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+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.UI;
+
+/// <summary>
+/// 屏幕虚拟摇杆（移动轮盘）。挂在预制体根节点上，子物体约定按名字查找：
+///   Background —— 底盘（RectTransform + Image）
+///   Handle     —— 摇杆头（RectTransform + Image）
+///
+/// 鼠标按住拖拽或手指触摸都可以操作，对外输出归一化方向 <see cref="Value"/>：
+/// x = 左右（右为正），y = 前后（上为正），模长 0~1 表示推杆幅度。
+/// 松手后方向归零。
+/// </summary>
+[DisallowMultipleComponent]
+public class VirtualJoystick : MonoBehaviour, IPointerDownHandler, IDragHandler, IPointerUpHandler
+{
+    [Header("引用（留空则按子物体名自动查找）")]
+    [SerializeField] private RectTransform background;
+    [SerializeField] private RectTransform handle;
+
+    [Header("手感（距离单位是 UI 像素，以底盘轴心为圆心）")]
+    [Tooltip("摇杆头允许离开中心的最大距离。拖到这个距离就是满值输入（Value 模长 = 1），再往外拖摇杆头也不动。" +
+             "底盘 280、摇杆头 120 时，80 ≈ 摇杆头刚好贴到底盘边缘。")]
+    [SerializeField] private float maxDragRadius = 80f;
+
+    [Tooltip("死区：拖动距离小于「最大半径 × 该比例」时不输出，避免手抖")]
+    [Range(0f, 0.9f)]
+    [SerializeField] private float deadZone = 0.12f;
+
+    [Tooltip("松手后摇杆头是否弹回中心")]
+    [SerializeField] private bool returnToCenter = true;
+
+    [Tooltip("松手后是否隐藏整个轮盘（移动端常用）")]
+    [SerializeField] private bool hideOnRelease = false;
+
+    /// <summary>归一化输入方向，x = 左右，y = 前后，模长 0~1。</summary>
+    public Vector2 Value { get; private set; }
+
+    /// <summary>当前是否按住了轮盘。</summary>
+    public bool IsPressed { get; private set; }
+
+    private Canvas _canvas;
+    private Vector2 _handleHomePosition;
+
+    private void Awake()
+    {
+        if (background == null)
+            background = FindChildRect("Background");
+        // 没有名为 Background 的子物体时，就把挂脚本的这个节点本身当作底盘
+        if (background == null)
+            background = transform as RectTransform;
+        if (handle == null)
+            handle = FindChildRect("Handle");
+
+        _canvas = GetComponentInParent<Canvas>();
+        if (handle != null)
+            _handleHomePosition = handle.anchoredPosition;
+    }
+
+    private void OnEnable()
+    {
+        ResetInput();
+    }
+
+    public void OnPointerDown(PointerEventData eventData)
+    {
+        IsPressed = true;
+        gameObject.SetActive(true);
+        UpdateFromPointer(eventData);
+    }
+
+    public void OnDrag(PointerEventData eventData)
+    {
+        IsPressed = true;
+        UpdateFromPointer(eventData);
+    }
+
+    public void OnPointerUp(PointerEventData eventData)
+    {
+        IsPressed = false;
+
+        if (returnToCenter)
+            ResetInput();
+
+        if (hideOnRelease)
+            gameObject.SetActive(false);
+    }
+
+    /// <summary>把摇杆归零，手柄回到初始位置。</summary>
+    public void ResetInput()
+    {
+        Value = Vector2.zero;
+        if (handle != null)
+            handle.anchoredPosition = _handleHomePosition;
+    }
+
+    private void UpdateFromPointer(PointerEventData eventData)
+    {
+        if (background == null) return;
+
+        Camera cam = _canvas != null && _canvas.renderMode == RenderMode.ScreenSpaceOverlay
+            ? null
+            : (eventData.pressEventCamera != null ? eventData.pressEventCamera : (_canvas != null ? _canvas.worldCamera : null));
+
+        if (!RectTransformUtility.ScreenPointToLocalPointInRectangle(background, eventData.position, cam, out Vector2 local))
+            return;
+
+        // local 是相对底盘轴心的像素偏移，直接按「最大拖动半径」归一化
+        float radius = Mathf.Max(1f, maxDragRadius);
+        float distance = local.magnitude;
+        Vector2 direction = distance > 0.0001f ? local / distance : Vector2.zero;
+        float magnitude = Mathf.Clamp01(distance / radius);
+
+        if (magnitude < deadZone)
+        {
+            Value = Vector2.zero;
+        }
+        else
+        {
+            // 死区外的部分重新映射到 0~1，避免刚出死区就一大跳
+            float remapped = Mathf.InverseLerp(deadZone, 1f, magnitude);
+            Value = direction * Mathf.Clamp01(remapped);
+        }
+
+        if (handle != null)
+            handle.anchoredPosition = _handleHomePosition + direction * (magnitude * radius);
+    }
+
+    private RectTransform FindChildRect(string childName)
+    {
+        Transform child = transform.Find(childName);
+        if (child == null)
+        {
+            // 允许更深层级，比如 Root/Art/Background
+            foreach (RectTransform rt in GetComponentsInChildren<RectTransform>(true))
+            {
+                if (rt != null && rt != transform && rt.name == childName)
+                    return rt;
+            }
+            return null;
+        }
+        return child as RectTransform;
+    }
+
+    private void OnValidate()
+    {
+        if (handle == null)
+            handle = FindChildRect("Handle");
+        if (background == null)
+            background = FindChildRect("Background") ?? transform as RectTransform;
+    }
+}