145 lines
3.8 KiB
GDScript
145 lines
3.8 KiB
GDScript
class_name Hook extends Node2D
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## ================
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## Export Field
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## ================
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@export var min_length := 140
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@export var max_length := 200
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@export var streching_speed:float = 1400
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## 线段
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@onready var line_2d: Line2D = %Line2D
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## 检测碰撞的区域
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@onready var area_2d: Area2D = %Area2D
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const GRAPABLE_GROUP = &"GRAPABLE"
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const ANCHOR_NODE = preload("uid://dfm5wy1rmci68")
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signal stretching_finished(reach_limit:bool, anchor_node: Node2D)
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## ================
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## Private Field
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## ================
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var _binded_hook_comp
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var _is_stretching: bool = false
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var _stretching_dir: Vector2 = Vector2.ZERO
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var _cached_cancel: bool = false
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var _anchor: Node2D
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func _ready() -> void:
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area_2d.position = Vector2.ZERO
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area_2d.area_entered.connect(grap_detected)
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area_2d.body_entered.connect(grap_detected)
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##初始化
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func init(hook_comp:SpawnHookComponet,reset_to_target: bool):
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_binded_hook_comp = hook_comp
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if reset_to_target:
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var p : Vector2= hook_comp.owner.global_position
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self.global_position = p
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##开始stretching
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func start_stretching(direction: Vector2) -> void:
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_is_stretching = true
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_cached_cancel = false
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_stretching_dir = direction
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##结束stretching
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func end_stretching(force_end: bool = false) -> bool:
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##如果还没有达到最短的stretching length，则继续
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if not force_end and _is_stretching:
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var d = self.global_position.distance_to(area_2d.global_position)
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if d < min_length:
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_cached_cancel = true
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return false
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_is_stretching = false
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_stretching_dir = Vector2.ZERO
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return true
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##是否正在stretching
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func is_stretching() -> bool:
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return _is_stretching
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##物理更新
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func _physics_process(delta: float) -> void:
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if _is_stretching:
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_update_stretching(delta)
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##更新绳索的动画表现
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func _process(delta: float) -> void:
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update_line_target_pos_with_index(0,self.global_position)
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update_line_target_pos_with_index(1,area_2d.global_position)
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##更新钩爪爪手的位置
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func _update_stretching(delta: float) -> void:
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var d = self.global_position.distance_to(area_2d.global_position)
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#如果已经存在一个缓存的取消，且当前的长度小于最小长度，则直接取消
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if _cached_cancel:
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if d >= min_length:
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stretching_finished.emit(true,null)
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end_stretching(true)
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return
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#如果达到的最大的长度，直接取消
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if d > max_length:
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stretching_finished.emit(true,null)
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end_stretching(true)
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return
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area_2d.global_position += delta * streching_speed * _stretching_dir
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## ================
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## Tool Func
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## ================
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##更新特定点的位置
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func update_line_target_pos_with_index(point_index: int, target_pos: Vector2) -> void:
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line_2d.set_point_position(
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point_index,
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target_pos - global_position
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)
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##当触碰到可以被抓握的Area后，自动在当前位置生成一个钩爪锚点，后续的移动交给其他系统
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func grap_detected(node: Node2D) -> void:
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if node.is_in_group(GRAPABLE_GROUP):
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end_stretching(true)
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var d : float= self.global_position.distance_to(area_2d.global_position)
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var b = d == max_length
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var anchor := _create_anchor_on_node(node)
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if anchor:
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stretching_finished.emit(b,anchor)
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##创建钩爪锚点
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func _create_anchor_on_node(area: Node2D) -> Node2D:
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# 如果之前有锚点，先清掉
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if _anchor and is_instance_valid(_anchor):
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_anchor.queue_free()
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# 1. 创建 Anchor
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_anchor = Node2D.new()
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_anchor.name = "Anchor"
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add_child(_anchor)
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# 2. Anchor 初始位置 = Area 当前世界位置
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_anchor.global_position = area.global_position
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# 3. 在 Area 上挂 RemoteTransform2D
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var remote := RemoteTransform2D.new()
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remote.name = "AnchorRemote"
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area.add_child(remote)
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remote.remote_path = _anchor.get_path()
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# 4. 只同步位置（锚点一般不需要跟旋转/缩放）
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remote.update_rotation = false
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remote.update_scale = false
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return _anchor
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