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Script/Item/BagItem.cs

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+using Godot;
+using System;
+using System.Collections.Generic;
+
+public partial class BagItem
+{
+    public ItemResource itemResource;
+    public int amount;
+
+    public string ItemName
+    {
+        get
+        {
+            return itemResource?.ItemName ?? "Unknown"; // 防止空引用
+        }
+    }
+
+    public string Description
+    {
+        get
+        {
+            return itemResource?.Description ?? "No description"; // 防止空引用
+        }
+    }
+
+    public void AddAmount(int value)
+    {
+        if (value < 0)
+        {
+            GD.PrintErr("Cannot add negative amount to BagItem.");
+            return;
+        }
+        amount += value;
+    }
+
+    public void RemoveAmount(int value)
+    {
+        if (value < 0 || value > amount)
+        {
+            GD.PrintErr("Invalid amount to remove from BagItem.");
+            return;
+        }
+        amount -= value;
+    }
+}

Script/Item/BagItem.cs.uid

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+uid://bbwjvic0ilxan

Script/Item/ItemResource.cs

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+using Godot;
+using System;
+
+[GlobalClass]
+public partial class ItemResource : Resource
+{
+    [Export] public string ItemName{ get; private set; }
+    [Export] public string Description{  get; private set; }
+    [Export] public Texture2D Icon{ get; private set; }
+    [Export] public bool Stackable{  get; private set; }
+}

Script/Item/ItemResource.cs.uid

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+uid://d02in2v01dbtb

Script/Item/Projectile.cs

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+using Godot;
+using System;
+
+public partial class Projectile : Area2D
+{
+    // === 子弹属性 ===
+    [Export] public float Speed = 500f;          // 子弹速度（像素/秒）
+    [Export] public float LifeTime = 2f;         // 子弹存在时间（秒）
+    [Export] public int Damage = 10;             // 子弹伤害值
+    [Export] public Texture2D ProjectileTexture; // 子弹视觉纹理
+
+    // === 内部状态 ===
+    public Vector2 Direction = Vector2.Right;    // 子弹方向（由武器设置）
+    public Node2D From;                         // 子弹所有者（用于避免自伤）
+
+    private Timer _lifeTimer;                    // 生命周期计时器
+    private Sprite2D _visualSprite;              // 视觉精灵节点
+
+    public override void _Ready()
+    {
+        // === 初始化视觉表现 ===
+        SetupVisualRepresentation();
+
+        // === 初始化生命周期计时器 ===
+        SetupLifeTimer();
+
+        // === 连接碰撞信号 ===
+        BodyEntered += OnBodyEntered;
+    }
+
+    /// <summary>
+    /// 设置子弹视觉表现
+    /// </summary>
+    private void SetupVisualRepresentation()
+    {
+        // 尝试获取现有的精灵节点
+        _visualSprite = GetNodeOrNull<Sprite2D>("VisualSprite");
+
+        // 如果不存在则创建
+        if (_visualSprite == null && ProjectileTexture != null)
+        {
+            _visualSprite = new Sprite2D();
+            _visualSprite.Name = "VisualSprite";
+            AddChild(_visualSprite);
+        }
+
+        // 应用纹理到视觉精灵
+        if (_visualSprite != null && ProjectileTexture != null)
+        {
+            _visualSprite.Texture = ProjectileTexture;
+        }
+
+        // 根据方向旋转子弹
+        if (Direction != Vector2.Zero)
+        {
+            Rotation = Mathf.Atan2(Direction.Y, Direction.X);
+        }
+    }
+
+    /// <summary>
+    /// 设置生命周期计时器
+    /// </summary>
+    private void SetupLifeTimer()
+    {
+        _lifeTimer = new Timer();
+        AddChild(_lifeTimer);
+        _lifeTimer.WaitTime = LifeTime;
+        _lifeTimer.OneShot = true; // 单次触发模式
+        _lifeTimer.Timeout += OnLifeTimerTimeout;
+        _lifeTimer.Start();
+    }
+
+    public override void _PhysicsProcess(double delta)
+    {
+        float deltaF = (float)delta;
+
+        // 移动子弹
+        GlobalPosition += Direction * Speed * deltaF;
+    }
+
+    /// <summary>
+    /// 生命周期计时器回调
+    /// </summary>
+    private void OnLifeTimerTimeout()
+    {
+        // 子弹超时自动销毁
+        Destroy();
+    }
+
+    /// <summary>
+    /// 碰撞检测回调
+    /// </summary>
+    private void OnBodyEntered(Node2D body)
+    {
+        // 忽略所有者
+        if (body == From) return;
+
+        // 对可伤害实体造成伤害
+        if (body is IDamageable damageable)
+        {
+            damageable.TakeDamage(Damage);
+        }
+
+        // 销毁子弹
+        Destroy();
+    }
+
+    /// <summary>
+    /// 销毁子弹
+    /// </summary>
+    private void Destroy()
+    {
+        // 实际应用中应该：
+        // 1. 播放爆炸/命中效果
+        // 2. 播放音效
+        // 3. 可选: 留下弹痕/痕迹
+        QueueFree();
+    }
+}
+
+// 可伤害接口
+public interface IDamageable
+{
+    void TakeDamage(float amount);
+}

Script/Item/Projectile.cs.uid

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+uid://dg675fsx6dpv1