xiandie/scene/ground/script/c01/s12_飘动的寻人启事.gd

@tool
extends Node2D

@export var velocity := 0.15
@export var area_size := Vector2(500, 150):
	set(val):
		area_size = val
		queue_redraw()
@export var gizmo_outline_color := Color(0.5, 0.3, 0.4, 0.8):
	set(val):
		gizmo_outline_color = val
		queue_redraw()

@onready var remote_node := $Node2D
@onready var remote_sprite := %Sprite2D
@onready var sign_mark := %Sign as Sign

var interacted_x = -10000


func _draw() -> void:
	if Engine.is_editor_hint():
		# draw gizmo
		var area_rect = Rect2(Vector2.ZERO, area_size)
		# fill
		var fill_color = gizmo_outline_color
		fill_color.a = 0.4
		draw_rect(area_rect, fill_color)
		# outline
		draw_rect(area_rect, gizmo_outline_color, false, 1.0)


# 最多保持 4 个点; 先生成两个在左侧，再生成两个在右侧，然后再回到左侧，以此循环，形成左右摇摆的闭合路径
var bezier_points = [Vector2(0, 0), Vector2(150, 20), Vector2(250, 40), Vector2(350, 60), Vector2(400, 80), Vector2(300, 100), Vector2(250, 120), Vector2(160, 130), Vector2(120, 140), Vector2(60, 150), Vector2(0, 150)]
var current_position = Vector2.ZERO
var weight := 0.0


func _ready() -> void:
	if Engine.is_editor_hint():
		return
	# 手动配置运动点
	# # init points
	# for i in range(5):
	# 	bezier_points.append(_rand_point())
	sign_mark.enabled = visible
	sign_mark.interacted.connect(_on_interacted)
	visibility_changed.connect(_on_visibility_changed)
	interacted_x = ArchiveManager.archive.ground_archive().get_value(
		name, "interacted_x", interacted_x
	)
	if interacted_x > -10000:
		remote_node.position = Vector2(interacted_x, area_size.y)
		remote_sprite.material = null


func _on_visibility_changed() -> void:
	sign_mark.enabled = visible


func _next_point() -> void:
	# remove the first point
	bezier_points.remove_at(0)
	# # add a new point
	# bezier_points.append(_rand_point())


func _on_interacted() -> void:
	if interacted_x == -10000:
		_set_current_x_as_interacted_x()
	var inspect_texture = preload("res://asset/art/scene/c01/s07_书店外/纸片_正面.png")
	SceneManager.get_inspector().pop_prop_inspection("", inspect_texture, true)


func _set_current_x_as_interacted_x() -> void:
	interacted_x = remote_node.position.x
	remote_node.position.y = area_size.y
	remote_sprite.material = null
	ArchiveManager.archive.ground_archive().set_pair(name, "interacted_x", interacted_x)
	if GlobalConfig.DEBUG:
		print("interacted_x:", interacted_x)


# var _generated_points = -1

# func _rand_point() -> Vector2:
# 	_generated_points += 1
# 	# upleft,mid,downright,upright,mid,downleft,...
# 	match _generated_points % 6:
# 		0:
# 			_generated_points = 0
# 			# upleft
# 			return Vector2(
# 				randf_range(0, area_size.x * 0.3), randf_range(area_size.y * 0.6, area_size.y)
# 			)
# 		1:
# 			# upleft to center
# 			return Vector2(
# 				randf_range(area_size.x * 0.4, area_size.x * 0.6),
# 				randf_range(area_size.y * 0.3, area_size.y * 0.7)
# 			)
# 		2:
# 			# center to downright
# 			return Vector2(
# 				randf_range(area_size.x * 0.7, area_size.x), randf_range(0, area_size.y * 0.4)
# 			)
# 		3:
# 			# downright to upright
# 			return Vector2(
# 				randf_range(area_size.x * 0.7, area_size.x),
# 				randf_range(area_size.y * 0.6, area_size.y)
# 			)
# 		4:
# 			# upright to center
# 			return Vector2(
# 				randf_range(area_size.x * 0.4, area_size.x * 0.6),
# 				randf_range(area_size.y * 0.3, area_size.y * 0.7)
# 			)
# 		_:
# 			# center to downleft
# 			return Vector2(randf_range(0, area_size.x * 0.3), randf_range(0, area_size.y * 0.4))


# 从 bezier_points 中取出 4 个点，然后进行贝塞尔曲线插值
# 设置到 remote_transform 的 position 与 rotation
# 速度为 velocity，权重为 weight
func _process(delta: float) -> void:
	if Engine.is_editor_hint() or not visible or interacted_x > -10000:
		return

	# 如果不到 4 个点，跳过
	if bezier_points.size() < 4:
		return

	weight += velocity * delta
	if weight >= 1.0:
		weight = 0.0
		_next_point()

	# 当不到 4 个点时，落到地上
	if bezier_points.size() < 4:
		remote_node.position.y = area_size.y
		_set_current_x_as_interacted_x()
		return

	var p0 = bezier_points[0]
	var p1 = bezier_points[1]
	var p2 = bezier_points[2]
	var p3 = bezier_points[3]

	var p = p1.cubic_interpolate(p2, p0, p3, weight)
	# var p = p1.bezier_interpolate(p0, p3, p2, weight)
	remote_node.position = p
	# bezier 插值获得角度
	remote_sprite.rotation = lerp_angle(remote_sprite.rotation, p1.angle_to(p2), delta)
	remote_sprite.skew = -remote_sprite.rotation * 0.5