Danmaku system

Scripts/Resources/PatternGroup.cs

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+using Godot;
+using System.Collections.Generic;
+using Cirno.Scripts.Actors;
+using Godot.Collections;
+
+namespace Cirno.Scripts.Resources;
+
+[GlobalClass]
+public partial class PatternGroup : AttackPattern
+{
+    [Export] private Array<AttackPattern> patterns;
+    private int currentPatternIndex = 0;
+
+    public override void Start(Boss boss)
+    {
+        Boss = boss;
+        currentPatternIndex = 0;
+        patterns[currentPatternIndex].Start(boss);
+    }
+
+    public override void UpdatePattern(double delta)
+    {
+        if (currentPatternIndex < patterns.Count)
+        {
+            patterns[currentPatternIndex].UpdatePattern(delta);
+
+            if (!patterns[currentPatternIndex].WaitForCompletion || patterns[currentPatternIndex].IsComplete())
+            {
+                currentPatternIndex++;
+                if (currentPatternIndex < patterns.Count)
+                {
+                    patterns[currentPatternIndex].Start(Boss);
+                }
+            }
+        }
+    }
+
+    public override bool IsComplete()
+    {
+        return currentPatternIndex >= patterns.Count;
+    }
+}