183 lines
6.8 KiB
C#
183 lines
6.8 KiB
C#
using System.Collections.Generic;
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using UnityEngine;
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/// <summary>
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/// 手游触屏输入分发器：每帧遍历所有触摸点（及编辑器鼠标），用 Physics2D.OverlapPoint
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/// 命中带 TrackTouchZone 的透明 Collider2D，把按下/抬起转发给 InputManager。
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///
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/// 为什么用这种方式而不是 UI 的 IPointerDownHandler：
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/// - 轨道会平移+旋转晃动，点击区必须跟随晃动的 Collider（OverlapPoint 支持旋转过的碰撞体）。
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/// - 需要多点触控：每根手指独立按住各自的轨道（靠 fingerId 配对按下/抬起）。
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///
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/// 判定逻辑完全不变：这里只调用现成的 PressTrack/ReleaseTrack，
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/// 判定时间戳仍由 Note.HandlePress 读取 GameplayClock.NowSongTime（dspTime）。
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///
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/// 用法：场景里放一个空物体挂本脚本，把主相机拖到 gameplayCamera（留空则自动取 Camera.main）。
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/// 5 块透明轨道点击区各挂 TrackTouchZone 并设置 trackIndex。
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/// </summary>
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public class TrackTouchInput : MonoBehaviour
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{
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[Tooltip("渲染 gameplay 的相机。留空则自动使用 Camera.main。")]
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[SerializeField] private Camera gameplayCamera;
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[Tooltip("是否在编辑器/PC 上用鼠标模拟单点触摸（方便调试）。")]
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[SerializeField] private bool enableMouseFallback = true;
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[Tooltip("命中检测使用的层。默认 Everything；如需只检测点击区层可在此限制。")]
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[SerializeField] private LayerMask hitLayers = ~0;
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[Tooltip("透视相机必填：轨道点击区所在平面的世界 Z 坐标（轨道 Collider 的 Z）。\n" +
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"透视相机下屏幕点转世界点依赖深度，用它把射线交到轨道平面，相机怎么晃/推拉都精确。\n" +
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"正交相机可忽略此项。")]
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[SerializeField] private float trackPlaneWorldZ = 0f;
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[Tooltip("相机是否为正交投影。正交相机忽略深度，命中转换更简单。\n" +
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"留空自动按相机 orthographic 判断；一般不用手动改。")]
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[SerializeField] private bool forceOrthographicMode = false;
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// fingerId -> 当前按住的轨道索引。用于在抬起/取消时精确释放对应轨道。
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private readonly Dictionary<int, int> _activeTouches = new Dictionary<int, int>();
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// 鼠标模拟用的"手指 id"，取一个不会和真实 fingerId 冲突的值。
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private const int MouseFingerId = -100;
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private int _mouseHeldTrack = -1;
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private Camera Cam
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{
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get
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{
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if (gameplayCamera == null) gameplayCamera = Camera.main;
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return gameplayCamera;
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}
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}
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private void Update()
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{
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var im = InputManager.Instance;
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if (im == null) return;
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Camera cam = Cam;
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if (cam == null) return;
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ProcessTouches(im, cam);
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if (enableMouseFallback && Input.touchCount == 0)
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{
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ProcessMouse(im, cam);
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}
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}
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private void ProcessTouches(InputManager im, Camera cam)
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{
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for (int i = 0; i < Input.touchCount; i++)
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{
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Touch t = Input.GetTouch(i);
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switch (t.phase)
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{
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case TouchPhase.Began:
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{
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int track = ResolveTrack(cam, t.position);
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if (track >= 0)
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{
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_activeTouches[t.fingerId] = track;
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im.PressTrack(track);
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}
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break;
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}
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case TouchPhase.Ended:
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case TouchPhase.Canceled:
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{
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if (_activeTouches.TryGetValue(t.fingerId, out int track))
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{
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_activeTouches.Remove(t.fingerId);
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im.ReleaseTrack(track);
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}
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break;
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}
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// Moved / Stationary：手指在轨道内保持按住即可，不重新判定归属，
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// 避免手指轻微滑动跨到相邻轨道时反复 Press/Release 造成误判。
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}
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}
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}
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private void ProcessMouse(InputManager im, Camera cam)
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{
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if (Input.GetMouseButtonDown(0))
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{
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int track = ResolveTrack(cam, Input.mousePosition);
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if (track >= 0)
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{
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_mouseHeldTrack = track;
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im.PressTrack(track);
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}
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}
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else if (Input.GetMouseButtonUp(0))
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{
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if (_mouseHeldTrack >= 0)
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{
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im.ReleaseTrack(_mouseHeldTrack);
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_mouseHeldTrack = -1;
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}
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}
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}
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/// <summary>
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/// 把屏幕坐标转换为轨道平面上的世界点，用 OverlapPoint 命中轨道点击区，返回轨道索引；无命中返回 -1。
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///
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/// 相机移动/晃动/推拉时，每帧都用当前相机状态转换，所以命中自动跟随相机。
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/// - 正交相机：ScreenToWorldPoint 忽略深度，直接取 x/y。
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/// - 透视相机：从相机发射线，求与轨道平面（Z = trackPlaneWorldZ）的交点，
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/// 避免因相机 Z 变化（如 cameraDash）导致命中点偏移。
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/// </summary>
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private int ResolveTrack(Camera cam, Vector2 screenPos)
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{
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Vector2 point;
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if (forceOrthographicMode || cam.orthographic)
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{
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Vector3 world = cam.ScreenToWorldPoint(screenPos);
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point = new Vector2(world.x, world.y);
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}
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else
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{
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// 透视：射线与轨道平面（法线 +Z，过 z = trackPlaneWorldZ）求交。
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Ray ray = cam.ScreenPointToRay(screenPos);
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float denom = ray.direction.z;
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if (Mathf.Abs(denom) < 1e-6f)
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{
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return -1; // 射线与平面近乎平行，无有效交点
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}
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float t = (trackPlaneWorldZ - ray.origin.z) / denom;
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if (t < 0f)
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{
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return -1; // 交点在相机背后
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}
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Vector3 world = ray.origin + ray.direction * t;
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point = new Vector2(world.x, world.y);
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}
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Collider2D hit = Physics2D.OverlapPoint(point, hitLayers);
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if (hit == null) return -1;
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TrackTouchZone zone = hit.GetComponent<TrackTouchZone>();
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if (zone == null) zone = hit.GetComponentInParent<TrackTouchZone>();
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return zone != null ? zone.trackIndex : -1;
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}
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private void OnDisable()
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{
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// 组件被关闭/切场景时，释放所有还按住的轨道，避免音符卡在 held 状态。
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var im = InputManager.Instance;
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if (im != null)
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{
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foreach (var kv in _activeTouches)
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{
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im.ReleaseTrack(kv.Value);
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}
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if (_mouseHeldTrack >= 0) im.ReleaseTrack(_mouseHeldTrack);
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}
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_activeTouches.Clear();
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_mouseHeldTrack = -1;
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}
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}
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