awesome shit (see desc)

No longer Additive, it just sets the scroll speed

Now you can set it to either strumline

source/funkin/play/PlayState.hx

@@ -239,7 +239,7 @@ class PlayState extends MusicBeatSubState
   /**
    * An FlxTween that changes the additive speed to the desired amount.
    */
-  public var additiveScrollSpeedTween:FlxTween;
+  public var scrollSpeedTweens:Array<FlxTween> = [];
 
   /**
    * The camera follow point from the last stage.
@@ -1184,10 +1184,14 @@ class PlayState extends MusicBeatSubState
         cameraZoomTween.active = false;
         cameraTweensPausedBySubState.add(cameraZoomTween);
       }
-      if (additiveScrollSpeedTween != null && additiveScrollSpeedTween.active)
+
+      for (tween in scrollSpeedTweens)
       {
-        additiveScrollSpeedTween.active = false;
-        cameraTweensPausedBySubState.add(additiveScrollSpeedTween);
+        if (tween != null && tween.active)
+        {
+          tween.active = false;
+          cameraTweensPausedBySubState.add(tween);
+        }
       }
 
       // Pause the countdown.
@@ -3035,7 +3039,7 @@ class PlayState extends MusicBeatSubState
 
     // Cancel camera and scroll tweening if it's active.
     cancelAllCameraTweens();
-    cancelAdditiveScrollSpeedTween();
+    cancelScrollSpeedTweens();
 
     // If the opponent is GF, zoom in on the opponent.
     // Else, if there is no GF, zoom in on BF.
@@ -3256,37 +3260,39 @@ class PlayState extends MusicBeatSubState
   }
 
   /**
-   * The magical function that shall tween the additive scroll speed.
+   * The magical function that shall tween the scroll speed.
    */
-  public function tweenAdditiveScrollSpeed(?speed:Float, ?duration:Float, ?ease:Null<Float->Float>):Void
+  public function tweenScrollSpeed(?speed:Float, ?duration:Float, ?ease:Null<Float->Float>, strumlines:Array<String>):Void
   {
     // Cancel the current tween if it's active.
-    cancelAdditiveScrollSpeedTween();
-    var strumLineTargets:Array<Float> = [
-      playerStrumline.scrollSpeedAdditive + speed,
-      opponentStrumline.scrollSpeedAdditive + speed
-    ];
+    cancelScrollSpeedTweens();
+    for (i in strumlines)
+    {
+      var value:Float = speed;
+      var strum:Strumline = Reflect.getProperty(this, i);
 
-    if (duration == 0)
-    {
-      playerStrumline.scrollSpeedAdditive = strumLineTargets[0];
-      opponentStrumline.scrollSpeedAdditive = strumLineTargets[1];
-    }
-    else
-    {
-      additiveScrollSpeedTween = FlxTween.tween(this,
-        {
-          "playerStrumline.scrollSpeedAdditive": strumLineTargets[0],
-          "opponentStrumline.scrollSpeedAdditive": strumLineTargets[1]
-        }, duration, {ease: ease});
+      if (duration == 0)
+      {
+        strum.scrollSpeed = value;
+      }
+      else
+      {
+        scrollSpeedTweens.push(FlxTween.tween(strum,
+          {
+            'scrollSpeed': value
+          }, duration, {ease: ease}));
+      }
     }
   }
 
-  public function cancelAdditiveScrollSpeedTween()
+  public function cancelScrollSpeedTweens()
   {
-    if (additiveScrollSpeedTween != null)
+    for (tween in scrollSpeedTweens)
     {
-      additiveScrollSpeedTween.cancel();
+      if (tween != null)
+      {
+        tween.cancel();
+      }
     }
   }
 

source/funkin/play/event/ScrollSpeedEvent.hx

@@ -17,30 +17,31 @@ import funkin.data.event.SongEventSchema.SongEventFieldType;
  * Example: Scroll speed change of both strums from 1x to 1.3x:
  * ```
  * {
- *   'e': 'AdditiveScrollSpeed',
+ *   'e': 'ScrollSpeed',
  *   "v": {
- *      "scroll": "0.3",
+ *      "scroll": "1.3",
  *      "duration": "4",
  *      "ease": "linear"
  *    }
  * }
  * ```
  */
-class AdditiveScrollSpeedEvent extends SongEvent
+class ScrollSpeedEvent extends SongEvent
 {
   public function new()
   {
-    super('AdditiveScrollSpeed');
+    super('ScrollSpeed');
   }
 
-  static final DEFAULT_SCROLL:Float = 0;
+  static final DEFAULT_SCROLL:Float = 1;
   static final DEFAULT_DURATION:Float = 4.0;
   static final DEFAULT_EASE:String = 'linear';
+  static final DEFAULT_STRUMLINE:String = 'both'; // my special little trick
 
   public override function handleEvent(data:SongEventData):Void
   {
-    // Does nothing if there is no PlayState camera or stage.
-    if (PlayState.instance == null || PlayState.instance.currentStage == null) return;
+    // Does nothing if there is no PlayState.
+    if (PlayState.instance == null) return;
 
     var scroll:Float = data.getFloat('scroll') ?? DEFAULT_SCROLL;
 
@@ -48,11 +49,28 @@ class AdditiveScrollSpeedEvent extends SongEvent
 
     var ease:String = data.getString('ease') ?? DEFAULT_EASE;
 
+    var strumline:String = data.getString('strumline') ?? DEFAULT_STRUMLINE;
+
+    var strumlineNames:Array<String> = [];
+
+    if (scroll == 0)
+    {
+      // if the parameter is set to 0, reset the scroll speed to normal.
+      scroll = PlayState.instance?.currentChart?.scrollSpeed ?? 1.0;
+    }
+
+    switch (strumline)
+    {
+      case 'both':
+        strumlineNames = ['playerStrumline', 'opponentStrumline'];
+      default:
+        strumlineNames = [strumline + 'Strumline'];
+    }
     // If it's a string, check the value.
     switch (ease)
     {
       case 'INSTANT':
-        PlayState.instance.tweenAdditiveScrollSpeed(scroll, 0);
+        PlayState.instance.tweenScrollSpeed(scroll, 0, null, strumlineNames);
       default:
         var durSeconds = Conductor.instance.stepLengthMs * duration / 1000;
         var easeFunction:Null<Float->Float> = Reflect.field(FlxEase, ease);
@@ -62,19 +80,19 @@ class AdditiveScrollSpeedEvent extends SongEvent
           return;
         }
 
-        PlayState.instance.tweenAdditiveScrollSpeed(scroll, durSeconds, easeFunction);
+        PlayState.instance.tweenScrollSpeed(scroll, durSeconds, easeFunction, strumlineNames);
     }
   }
 
   public override function getTitle():String
   {
-    return 'Additive Scroll Speed';
+    return 'Scroll Speed';
   }
 
   /**
    * ```
    * {
-   *   'scroll': FLOAT, // Target additive scroll level.
+   *   'scroll': FLOAT, // Target scroll level.
    *   'duration': FLOAT, // Duration in steps.
    *   'ease': ENUM, // Easing function.
    * }
@@ -85,7 +103,7 @@ class AdditiveScrollSpeedEvent extends SongEvent
     return new SongEventSchema([
       {
         name: 'scroll',
-        title: 'Additive Scroll Amount',
+        title: 'Scroll Amount',
         defaultValue: 0.0,
         step: 0.1,
         type: SongEventFieldType.FLOAT,
@@ -106,7 +124,7 @@ class AdditiveScrollSpeedEvent extends SongEvent
         type: SongEventFieldType.ENUM,
         keys: [
           'Linear' => 'linear',
-          'Instant' => 'INSTANT',
+          'Instant (Ignores Duration)' => 'INSTANT',
           'Sine In' => 'sineIn',
           'Sine Out' => 'sineOut',
           'Sine In/Out' => 'sineInOut',
@@ -132,6 +150,13 @@ class AdditiveScrollSpeedEvent extends SongEvent
           'Elastic Out' => 'elasticOut',
           'Elastic In/Out' => 'elasticInOut'
         ]
+      },
+      {
+        name: 'strumline',
+        title: 'Target Strumline',
+        defaultValue: 'both',
+        type: SongEventFieldType.ENUM,
+        keys: ['Both' => 'both', 'Player' => 'player', 'Opponent' => 'opponent']
       }
     ]);
   }

source/funkin/play/notes/Strumline.hx

@@ -52,13 +52,12 @@ class Strumline extends FlxSpriteGroup
    */
   public var conductorInUse(get, set):Conductor;
 
-  // Used in-game to control the scroll speed within a song, for example if a song has an additive scroll speed of 1 and the base scroll speed is 1, it will be 2 - burgerballs
-  public var scrollSpeedAdditive:Float = 0;
-  public var scrollSpeed(get, never):Float;
+  // Used in-game to control the scroll speed within a song
+  public var scrollSpeed:Float = 1.0;
 
-  function get_scrollSpeed():Float
+  public function resetScrollSpeed():Void
   {
-    return (PlayState.instance?.currentChart?.scrollSpeed ?? 1.0) + scrollSpeedAdditive;
+    scrollSpeed = PlayState.instance?.currentChart?.scrollSpeed ?? 1.0;
   }
 
   var _conductorInUse:Null<Conductor>;
@@ -143,6 +142,7 @@ class Strumline extends FlxSpriteGroup
     this.refresh();
 
     this.onNoteIncoming = new FlxTypedSignal<NoteSprite->Void>();
+    resetScrollSpeed();
 
     for (i in 0...KEY_COUNT)
     {
@@ -217,11 +217,6 @@ class Strumline extends FlxSpriteGroup
     return null;
   }
 
-  public function resetScrollSpeed():Void
-  {
-    scrollSpeedAdditive = 0;
-  }
-
   public function getHoldNoteSprite(noteData:SongNoteData):SustainTrail
   {
     if (noteData == null || ((noteData.length ?? 0.0) <= 0.0)) return null;
@@ -552,7 +547,7 @@ class Strumline extends FlxSpriteGroup
     {
       playStatic(dir);
     }
-    scrollSpeedAdditive = 0;
+    resetScrollSpeed();
   }
 
   public function applyNoteData(data:Array<SongNoteData>):Void