46 lines
1.4 KiB
GDScript
46 lines
1.4 KiB
GDScript
class_name LinearMotionBehavior
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extends BulletBehavior
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## Makes bullets move in [member Bullet.direction], potentially accelerating.
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## Rate at which the bullet will speed up.
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@export_custom(0, "suffix:px/s²") var acceleration: float = 0.0
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## Speed will be clamped between [member min_speed] and [member max_speed].
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@export_custom(0, "suffix:px/s") var min_speed: float = -INF
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## Speed will be clamped between [member min_speed] and [member max_speed].
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@export_custom(0, "suffix:px/s") var max_speed: float = INF
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@export_group("Actions", "action_")
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## Performed when the bullet reaches either [member min_speed] or
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## [member max_speed] for the first time.
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@export var action_speed_clamped: BulletAction
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var _bullet_data: Dictionary[Bullet, Data] = {}
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func _init_bullet(bullet: Bullet) -> void:
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var data = Data.new()
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_bullet_data[bullet] = data
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func _deinit_bullet(bullet: Bullet) -> void:
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_bullet_data.erase(bullet)
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func _process_bullet(bullet: Bullet, delta: float) -> void:
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if not _bullet_data.has(bullet):
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return
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var data = _bullet_data[bullet]
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bullet.speed += acceleration * delta
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if not data.already_clamped and (bullet.speed <= min_speed or bullet.speed >= max_speed):
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data.already_clamped = true
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if action_speed_clamped:
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action_speed_clamped.perform(bullet)
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bullet.speed = clampf(bullet.speed, min_speed, max_speed)
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bullet.position += bullet.direction * bullet.speed * delta
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class Data:
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var already_clamped: bool = false
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