Programatically Create CollisionPolygon2D based on AnimatedSprite2D

collision_polygon_2d.gd

extends CollisionPolygon2D

@export var animatedSprite2D: AnimatedSprite2D

#	Programatically Create CollisionPolygon2D based on AnimatedSprite2D


func update_collision_polygon() -> void:
	var data = (
		animatedSprite2D
		. sprite_frames
		. get_frame_texture(animatedSprite2D.animation, animatedSprite2D.frame)
		. get_image()
	)

	var bitmap = BitMap.new()
	bitmap.create_from_image_alpha(data)

	var polys = bitmap.opaque_to_polygons(Rect2(Vector2.ZERO, Vector2(data.get_size())), 1)

	for poly in polys:
		polygon = poly

#	Polygon needs to be centered
	position = -Vector2(data.get_size()) / 2


func _on_animated_sprite_2d_frame_changed():
	update_collision_polygon()


func _on_animated_sprite_2d_animation_changed():
	update_collision_polygon()