class_name EnemyBullet
extends Area2D
## 敌方弹丸：直线飞行，出屏即回收。

const TEX := preload("res://assets/svg/bullet_enemy.svg")

var velocity := Vector2(0.0, 260.0)


func _ready() -> void:
	collision_layer = 8
	collision_mask = 0
	var sprite := Sprite2D.new()
	sprite.texture = TEX
	add_child(sprite)
	var shape := CollisionShape2D.new()
	var circle := CircleShape2D.new()
	circle.radius = 5.0
	shape.shape = circle
	add_child(shape)


func _process(delta: float) -> void:
	position += velocity * delta
	if position.y < -40.0 or position.y > 1000.0 or position.x < -40.0 or position.x > 580.0:
		queue_free()