Implement note visuals update method.

rhythm_game/note/visual/hold/hold_note.gd

@@ -6,13 +6,36 @@ class_name HoldNote extends NoteVisual
 
 var start_id: int
 var end_id: int
+var start_beat: float
+var end_beat: float
 
 func reset() -> void:
 	start_id = -1
 	end_id = -1
+	start_beat = -999.0
+	end_beat = -999.0
 
 func in_use() -> bool:
 	return start_id >= 0 or end_id >= 0
 
 func update(beat: float) -> void:
-	pass
+	var start_scroll: float
+	if start_beat:
+		start_scroll = _calculate_scroll(start_beat, beat)
+	else:
+		start_scroll = 999.0 # Decently up. (TODO Replace with offset_begin).
+	_set_start_scroll(start_scroll)
+	
+	var end_scroll: float
+	if end_beat:
+		end_scroll = _calculate_scroll(end_beat, beat)
+	else:
+		end_scroll = -999.0 # Decently down. (TODO Replace with offset_end).
+	_set_end_scroll(end_scroll)
+
+# ======== IMPLEMENTATION ======== #
+func _set_start_scroll(scroll: float) -> void:
+	start.y = scroll
+
+func _set_end_scroll(scroll: float) -> void:
+	end.y = scroll

rhythm_game/note/visual/hold/hold_note.tscn

@@ -2,8 +2,10 @@
 
 [ext_resource type="Script" uid="uid://cbsnb8bdby0d" path="res://rhythm_game/note/visual/hold/hold_note.gd" id="1_5cv34"]
 
-[node name="HoldNote" type="Node2D" unique_id=320259211]
+[node name="HoldNote" type="Node2D" unique_id=320259211 node_paths=PackedStringArray("start", "end")]
 script = ExtResource("1_5cv34")
+start = NodePath("NoteStart")
+end = NodePath("NoteEnd")
 metadata/_custom_type_script = "uid://cbsnb8bdby0d"
 
 [node name="NoteStart" type="Node2D" parent="." unique_id=1911676927]

rhythm_game/note/visual/note_visual.gd

@@ -20,3 +20,6 @@ func _notification(what: int) -> void:
 			_lane = get_parent() as Lane
 		NOTIFICATION_UNPARENTED:
 			_lane = null
+
+static func _calculate_scroll(target_beat: float, current_beat: float) -> float:
+	return Settings.get_note_scroll_speed() * (current_beat - target_beat)

rhythm_game/note/visual/tap/tap_note.gd

@@ -1,14 +1,16 @@
 class_name TapNote extends NoteVisual
 
+var hit_beat: float = -999.0
+
 var id: int = -1
 
-#TODO: Add all the members needed so a note can be updated.
-
 func reset() -> void:
 	id = -1
+	hit_beat = -999.0
+	position = Vector2(0, 9999.0)
 
 func in_use() -> bool:
 	return id >= 0
 
 func update(beat: float) -> void:
-	pass
+	position.y = _calculate_scroll(hit_beat, beat)