160 lines
3.9 KiB
GDScript
160 lines
3.9 KiB
GDScript
class_name Hook
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extends Node2D
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## ================
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## Export Field
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## ================
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@export var min_length := 140.0
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@export var max_length := 200.0
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@export var stretching_speed: float = 1400.0
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@onready var line_2d: Line2D = %Line2D
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@onready var ray: RayCast2D = %RayCast2D
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const GRAPABLE_GROUP = &"GRAPABLE"
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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 := false
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var _stretching_dir := Vector2.ZERO
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var _cached_cancel := false
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var _current_length := 0.0
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var _anchor: Node2D
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# =================
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# Life Cycle
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# =================
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func _ready() -> void:
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ray.enabled = true
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ray.target_position = Vector2.ZERO
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## 初始化
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func init(hook_comp: SpawnHookComponet, reset_to_target: bool) -> void:
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_binded_hook_comp = hook_comp
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if reset_to_target:
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global_position = hook_comp.owner.global_position
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# =================
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# Stretch Control
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# =================
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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.normalized()
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_current_length = 0.0
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func end_stretching(force_end: bool = false) -> bool:
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if not force_end and _is_stretching:
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if _current_length < 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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func is_stretching() -> bool:
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return _is_stretching
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# =================
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# Update
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# =================
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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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func _process(_delta: float) -> void:
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_update_line()
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# =================
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# Core Logic
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# =================
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func _update_stretching(delta: float) -> void:
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# 先嘗試推進
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var next_length := _current_length + stretching_speed * delta
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next_length = min(next_length, max_length)
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# 先用「下一幀長度」做 Ray
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ray.target_position = _stretching_dir * next_length
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ray.force_raycast_update()
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# ===== 命中檢測（最高優先）=====
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if ray.is_colliding():
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var collider := ray.get_collider()
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if collider is Node2D and collider.is_in_group(GRAPABLE_GROUP):
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var hit_pos := ray.get_collision_point()
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_current_length = global_position.distance_to(hit_pos)
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ray.target_position = _stretching_dir * _current_length
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_handle_hit(collider as Node2D, hit_pos)
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return
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# ===== 沒命中，才正式推進 =====
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_current_length = next_length
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# 取消邏輯
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if _cached_cancel and _current_length >= 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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# 超過最大距離
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if _current_length >= max_length:
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stretching_finished.emit(true, null)
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end_stretching(true)
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func _handle_hit(target: Node2D, hit_pos: Vector2) -> void:
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_is_stretching = false
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_stretching_dir = Vector2.ZERO
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ray.target_position = to_local(hit_pos)
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var reach_max := is_equal_approx(_current_length, max_length)
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var anchor := _create_anchor_on_node(target, hit_pos)
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stretching_finished.emit(reach_max, anchor)
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## 釋放鉤爪（清理 Anchor 與狀態）
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func release_hook() -> void:
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# 1. 停止拉伸（保險）
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_is_stretching = false
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_stretching_dir = Vector2.ZERO
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_cached_cancel = false
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_current_length = 0.0
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# 2. 清掉 Anchor
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if _anchor and is_instance_valid(_anchor):
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# 先脫離父節點，避免殘留引用問題
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_anchor.get_parent().remove_child(_anchor)
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_anchor.queue_free()
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_anchor = null
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# 3. 重置 Ray 與 Line（視覺清乾淨）
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ray.target_position = Vector2.ZERO
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_update_line()
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func _update_line() -> void:
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line_2d.set_point_position(0, Vector2.ZERO)
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line_2d.set_point_position(1, ray.target_position)
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func _create_anchor_on_node(target: Node2D, hit_global_pos: Vector2) -> Node2D:
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if _anchor and is_instance_valid(_anchor):
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_anchor.queue_free()
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_anchor = Node2D.new()
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_anchor.name = "Anchor"
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target.add_child(_anchor)
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# 關鍵：固定命中點偏移
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_anchor.position = target.to_local(hit_global_pos)
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return _anchor
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