extends Sprite2D

@export var export_path := ""
@export var height := 300
@export var l_ease_in_x := 500.0
@export var mid := 1000.0
@export var r_ease_out_x := 500.0


func _ready() -> void:
	if export_path:
		var width := (l_ease_in_x + mid + r_ease_out_x) as int
		var image = Image.create_empty(width, height, false, Image.FORMAT_RGBA8)
		# convert to transparent BG point light image
		for y in range(height):
			for x in range(width):
				var color = Color(1.0, 1.0, 1.0, 1.0)
				if x < l_ease_in_x:
					# color.a = smoothstep(0.0, 1.0, x / l_ease_in_x)
					color.a = x / l_ease_in_x
				elif x > l_ease_in_x + mid:
					# color.a = smoothstep(1.0, 0.0, (x - l_ease_in_x - mid) / r_ease_out_x)
					color.a = 1.0 - (x - l_ease_in_x - mid) / r_ease_out_x
				image.set_pixel(x, y, color)
		image.save_png(export_path)
		texture = ImageTexture.create_from_image(image)
		print("Exported to: " + export_path)
	else:
		print("No export path found")