120 lines
3.0 KiB
GDScript
120 lines
3.0 KiB
GDScript
@tool
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extends Node2D
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@export var velocity := 0.1
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@export var remote_node: Node2D:
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set(val):
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remote_node = val
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if is_node_ready():
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if remote_node:
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remote_transform.remote_path = remote_node.get_path()
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else:
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remote_transform.remote_path = ""
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@export var area_size := Vector2(400, 50):
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set(val):
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area_size = val
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queue_redraw()
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@export var gizmo_outline_color := Color(0.5, 0.3, 0.4, 0.8):
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set(val):
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gizmo_outline_color = val
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queue_redraw()
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@onready var remote_transform := $RemoteTransform2D as RemoteTransform2D
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func _draw() -> void:
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remote_transform.remote_path = remote_node.get_path()
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if Engine.is_editor_hint():
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# draw gizmo
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var area_rect = Rect2(Vector2.ZERO, area_size)
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# fill
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var fill_color = gizmo_outline_color
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fill_color.a = 0.4
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draw_rect(area_rect, fill_color)
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# outline
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draw_rect(area_rect, gizmo_outline_color, false, 1.0)
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# 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
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var bezier_points = []
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var current_position = Vector2.ZERO
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var weight := 0.0
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func _ready() -> void:
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# init points
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for i in range(4):
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bezier_points.append(_rand_point())
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func _new_point() -> void:
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# remove the first point
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bezier_points.remove_at(0)
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# add a new point
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bezier_points.append(_rand_point())
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var _generated_points = -1
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func _rand_point() -> Vector2:
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_generated_points += 1
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# upleft,mid,downright,upright,mid,downleft,...
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match _generated_points % 6:
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0:
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_generated_points = 0
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# upleft
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return Vector2(
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randf_range(0, area_size.x * 0.3), randf_range(area_size.y * 0.6, area_size.y)
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)
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1:
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# upleft to center
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return Vector2(
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randf_range(area_size.x * 0.4, area_size.x * 0.6),
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randf_range(area_size.y * 0.3, area_size.y * 0.7)
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)
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2:
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# center to downright
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return Vector2(
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randf_range(area_size.x * 0.7, area_size.x), randf_range(0, area_size.y * 0.4)
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)
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3:
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# downright to upright
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return Vector2(
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randf_range(area_size.x * 0.7, area_size.x),
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randf_range(area_size.y * 0.6, area_size.y)
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)
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4:
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# upright to center
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return Vector2(
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randf_range(area_size.x * 0.4, area_size.x * 0.6),
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randf_range(area_size.y * 0.3, area_size.y * 0.7)
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)
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_:
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# center to downleft
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return Vector2(randf_range(0, area_size.x * 0.3), randf_range(0, area_size.y * 0.4))
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# 从 bezier_points 中取出 4 个点，然后进行贝塞尔曲线插值
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# 设置到 remote_transform 的 position 与 rotation
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# 速度为 velocity，权重为 weight
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func _process(delta: float) -> void:
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if Engine.is_editor_hint():
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return
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weight += velocity * delta
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if weight >= 1.0:
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weight = 0.0
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_new_point()
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var p0 = bezier_points[0]
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var p1 = bezier_points[1]
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var p2 = bezier_points[2]
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var p3 = bezier_points[3]
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var p = p1.cubic_interpolate(p2, p0, p3, weight)
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# var p = p1.bezier_interpolate(p0, p3, p2, weight)
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remote_transform.position = p
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# bezier 插值获得角度
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remote_transform.rotation = lerp_angle(remote_transform.rotation, p1.angle_to(p2), delta)
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