Danmaku system

Scripts/AttackPatterns/SpiralPattern.cs

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+using Cirno.Scripts.Actors;
+using Cirno.Scripts.Components;
+using Cirno.Scripts.Resources;
+using Godot;
+
+namespace Cirno.Scripts.AttackPatterns;
+
+[GlobalClass]
+public partial class SpiralPattern : AttackPattern
+{
+    [Export] public PackedScene BulletScene;
+    [Export] private float bulletSpeed = 5f;
+    [Export] private int bulletCount = 16;
+    [Export] private float rotationSpeed = 90f;
+    [Export] private float duration = 5f;
+    [Export] private float burstInterval = 0.5f;
+    [Export] private float spread = 360f;
+    [Export] private BulletOwner owner = BulletOwner.Enemy;
+
+    private double timer;
+    private double burstTimer;
+    private BulletSpawner spawner;
+
+    public override void Start(Boss boss)
+    {
+        Boss = boss;
+        timer = 0;
+        burstTimer = burstInterval; // start immediately
+        spawner = boss.GetNode<BulletSpawner>("BulletSpawner");
+    }
+
+    public override void UpdatePattern(double delta)
+    {
+        timer += delta;
+        burstTimer += delta;
+        if (timer < duration && burstTimer >= burstInterval)
+        {
+            spawner.SpawnSpiralPattern(Boss.GlobalPosition, bulletSpeed, owner, bulletCount, rotationSpeed, timer, spread, BulletScene);
+            burstTimer = 0;
+        }
+    }
+
+    public override bool IsComplete()
+    {
+        return timer >= duration;
+    }
+}