87 lines
2.9 KiB
C#
87 lines
2.9 KiB
C#
using BaseGames.Core.Events;
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using BaseGames.Input;
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using UnityEngine;
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namespace BaseGames.World
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{
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/// <summary>
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/// 挂在 Player 上，检测附近可交互物，驱动 UI 提示显示/隐藏。
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/// 通过 InputReaderSO.InteractEvent 绑定交互输入。
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/// </summary>
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public class InteractableDetector : MonoBehaviour
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{
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[SerializeField] private float _detectRadius = 1.5f;
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[SerializeField] private LayerMask _interactableLayer;
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[SerializeField] private InputReaderSO _inputReader;
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[SerializeField] private StringEventChannelSO _onShowInteractPrompt;
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[SerializeField] private VoidEventChannelSO _onHideInteractPrompt;
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private IInteractable _nearest;
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private IInteractable _previousNearest;
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// 预分配检测缓冲区，避免 OverlapCircleAll 每帧 GC 分配
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private readonly Collider2D[] _overlapBuffer = new Collider2D[16];
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private void OnEnable() => _inputReader.InteractEvent += TryInteract;
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private void OnDisable() => _inputReader.InteractEvent -= TryInteract;
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private void Update()
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{
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int count = Physics2D.OverlapCircleNonAlloc(
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transform.position, _detectRadius, _overlapBuffer, _interactableLayer);
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_nearest = FindNearest(_overlapBuffer, count);
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if (_nearest != _previousNearest)
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{
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if (_previousNearest != null)
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{
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_previousNearest.OnPlayerExitRange();
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_onHideInteractPrompt?.Raise();
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}
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if (_nearest != null)
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{
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_nearest.OnPlayerEnterRange(transform);
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_onShowInteractPrompt?.Raise(_nearest.InteractPrompt);
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}
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_previousNearest = _nearest;
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}
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}
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private void TryInteract()
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{
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if (_nearest != null && _nearest.CanInteract)
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_nearest.Interact(transform);
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}
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private IInteractable FindNearest(Collider2D[] hits, int count)
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{
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IInteractable best = null;
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float bestDist = float.MaxValue;
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for (int i = 0; i < count; i++)
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{
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var col = hits[i];
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var interactable = col.GetComponentInParent<IInteractable>();
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if (interactable == null || !interactable.CanInteract) continue;
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float dist = Vector2.Distance(transform.position, col.transform.position);
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if (dist < bestDist)
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{
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bestDist = dist;
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best = interactable;
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}
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}
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return best;
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}
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private void OnDrawGizmosSelected()
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{
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Gizmos.color = Color.cyan;
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Gizmos.DrawWireSphere(transform.position, _detectRadius);
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}
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}
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}
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