Organize files. WIP score system.

rhythm_game/note/view/view.gd

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+## Abstract class representing a range of notes in some kind of array,
+## expressed by a beginning index and an ending index: [begin, end).
+@abstract class_name View extends Node
+
+## Get the array this View refers to.
+@abstract func get_data() -> Variant
+
+## Update the view to be relative to beat.
+## Can be connected to a beat update signal.
+@abstract func update_current_beat(beat: float) -> void
+
+## Beginning of the range relative to te current beat where notes will be visible.
+## Any notes where (hit_beat < current_beat + offset_begin) will NOT be visible.
+@export var offset_begin: float = -4.0
+
+## End of the range relative to the current beat where notes will be visible.
+## Any notes where (hit_beat > current_beat + offset_end) will NOT be visible.
+@export var offset_end: float = 4.0
+
+## Return the index to the first element.
+func begin() -> int:
+	return _begin
+
+## Return the index after the last element (equal to last index + 1).
+func end() -> int:
+	return _end
+
+## Size of the range encompassed by begin() and end().
+func size() -> int:
+	return int(_begin >= 0) * _end - _begin
+
+# ======= IMPLEMENETATION ======= #
+var _begin: int = -1
+var _end: int = -1
+
+var _current_beat: float = -999
+var _previous_beat: float = -999
+
+func _reset_view() -> void:
+	_begin = -1
+	_end = -1
+	_current_beat = -999
+	_previous_beat = -999
+
+## Update the view to match _current_beat.
+func _update_view_relative_to_notes(notes: NoteArray) -> void:
+	var new_begin = _begin
+	var new_end = _end
+	if _current_beat > _previous_beat:
+		# Update forward.
+		while(new_begin < notes.size()) and (notes.beat_at(new_begin) < _current_beat + offset_begin):
+			new_begin += 1
+		while(new_end < notes.size()) and (notes.beat_at(new_end) <= _current_beat + offset_end):
+			new_end += 1
+	elif _current_beat < _previous_beat:
+		# Update backward.
+		while(new_begin >= 0) and (notes.beat_at(new_begin) >= _current_beat + offset_begin):
+			_begin -= 1
+		while(new_end >= 0) and (notes.beat_at(new_end) > _current_beat + offset_end):
+			new_end -= 1
+		if(new_begin != _begin):
+			new_begin += 1
+		if(new_end != _end):
+			new_end += 1
+	
+	_begin = new_begin
+	_end = new_end
+	_previous_beat = _current_beat