69 lines
2.1 KiB
GDScript
69 lines
2.1 KiB
GDScript
## 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
|