[+] 为OgkChart，重写那些应该被重写的基类工具方法

Author: Starrah

chart/BaseChart.cs

@@ -120,16 +120,7 @@ public virtual void Sort()
     public virtual void Shift(Rational offset, decimal? bpm = null)
     {
         bpm ??= StartBpm;
-        
-        if (offset < 0)
-        { // 向前平移。此时存在的一种极端情况就是指定的区间跨过了多个BPM区间。
-            // 传入的bpm参数本质是一种写死的InvariantBar，因此要把它转为可变Bar，才是真正的要去应用的offset。
-            offset = -BpmList.ConvertTime(0, -offset, bpm, null);
-        }
-        else if (offset > 0)
-        { // 向后平移。需要把传入的offset的量换算到乐曲开头BPM下，才是真正的量。
-            offset = offset * (Rational)StartBpm / (Rational)bpm;
-        }
+        offset = _calcOffsetForShift(offset, bpm.Value);
 
         // 对BpmList和MetList的处理：需要确保首项为0
         BpmList = new BPMList(BpmList.Select(x => x with { Time = x.Time + offset })
@@ -160,4 +151,18 @@ BaseNote addOffset(BaseNote note)
             return note;
         }
     }
+
+    protected Rational _calcOffsetForShift(Rational offset, decimal bpm)
+    {
+        if (offset < 0)
+        { // 向前平移。此时存在的一种极端情况就是指定的区间跨过了多个BPM区间。
+            // 传入的bpm参数本质是一种写死的InvariantBar，因此要把它转为可变Bar，才是真正的要去应用的offset。
+            offset = -BpmList.ConvertTime(0, -offset, bpm, null);
+        }
+        else if (offset > 0)
+        { // 向后平移。需要把传入的offset的量换算到乐曲开头BPM下，才是真正的量。
+            offset = offset * (Rational)StartBpm / (Rational)bpm;
+        }
+        return offset;
+    }
 }

chart/ogk/Bullet.cs

@@ -7,6 +7,7 @@ namespace MuConvert.ogk;
 public interface IBullet
 {
     public BulletPallete? Detail { get; set; }
+    public Rational Time { get; }
 }
 
 /**
@@ -32,7 +33,7 @@ public class Bullet: IBullet
     public BulletPallete Detail { get; set; } = new();
 #pragma warning restore CS8767
 
-    public Rational Time;
+    public Rational Time { get; set; }
     public int Pos;
 
     public BulletDamage Damage = BulletDamage.NML;

chart/ogk/OgkChart.cs

@@ -38,4 +38,44 @@ public class OgkChart: BaseChart<OgkNote>
 
     // 部分谱面中会有，上方的敌人在上面进行水平方向的移动的情况。
     public List<EnemyMovement> EnemyMovements = [];
+
+    public override decimal StartTime => Math.Min(base.StartTime, (decimal)ToSecond(Bullets.First().Time));
+    public override decimal EndTime => Math.Max(base.EndTime, (decimal)ToSecond(Bullets.Last().Time));
+    public override int TotalNotes => throw new NotImplementedException();
+
+    public override void Sort()
+    {
+        base.Sort();
+        // 在base通用实现的基础上，额外排序我们自己新增的四个字段
+        Lanes = Lanes.OrderBy(x => x.Time).ToList();
+        Bullets = Bullets.OrderBy(x => x.Time).ToList();
+        EnemyList.Sort();
+        EnemyMovements = EnemyMovements.OrderBy(x => x.Time).ToList();
+    }
+
+    public override void Shift(Rational offset, decimal? bpm = null)
+    {
+        bpm ??= StartBpm;
+        offset = _calcOffsetForShift(offset, bpm.Value);
+        
+        base.Shift(offset, bpm);
+        // 在base通用实现的基础上，额外移动我们自己新增的四个字段
+        Lanes = Lanes.Where(x => addOffset(x).Time >= 0).ToList();
+        EnemyList = EnemyList.Select(x => x with {Time = x.Time + offset}).Where(x=>x.Time >= 0).ToList();
+        EnemyMovements = EnemyMovements.Where(x => addOffset(x).Time >= 0).ToList();
+        
+        foreach (var bul in Bullets)
+        {
+            if (bul is Bullet bullet) bullet.Time += offset;
+            else if (bul is Beam beam) beam.Points = beam.Points.Select(x => x with { Time = x.Time + offset }).ToList();
+            else throw Utils.Fail();
+        }
+        Bullets = Bullets.Where(x => x.Time >= 0).ToList();
+        
+        T addOffset<T>(T lane)where T: OgkBaseLane<OgkLanePoint>
+        {
+            lane.Points = lane.Points.Select(x => x with {Time = x.Time + offset}).ToList();
+            return lane;
+        }
+    }
 }