48 lines
1.2 KiB
GDScript3
48 lines
1.2 KiB
GDScript3
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class_name TypewriterReveal
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extends RefCounted
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const DEFAULT_CHARACTERS_PER_SECOND: float = 28.0
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const MIN_CHARACTERS_PER_SECOND: float = 12.0
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const MAX_CHARACTERS_PER_SECOND: float = 60.0
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static var _characters_per_second: float = DEFAULT_CHARACTERS_PER_SECOND
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static func set_characters_per_second(value: float) -> void:
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_characters_per_second = clampf(
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value,
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MIN_CHARACTERS_PER_SECOND,
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MAX_CHARACTERS_PER_SECOND,
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)
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static func get_characters_per_second() -> float:
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return _characters_per_second
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static func start(
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label: Label,
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characters_per_second: float = -1.0,
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) -> float:
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if label == null:
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return 0.0
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var character_count: int = label.get_total_character_count()
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if character_count <= 0:
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label.visible_characters = -1
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return 0.0
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label.visible_characters = 0
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var resolved_characters_per_second := (
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characters_per_second
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if characters_per_second > 0.0
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else _characters_per_second
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)
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var duration := float(character_count) / resolved_characters_per_second
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var reveal_tween := label.create_tween()
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reveal_tween.tween_property(
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label,
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"visible_characters",
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character_count,
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duration,
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).from(0).set_trans(Tween.TRANS_LINEAR)
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return duration
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