104 lines
3.0 KiB
GDScript
104 lines
3.0 KiB
GDScript
class_name GrappingHook extends Node2D
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@export var min_rope_length := 20
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@export var max_rope_length := 200
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@onready var anchor: StaticBody2D = %Anchor
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@onready var pin_joint_2d: PinJoint2D = %PinJoint2D
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@onready var player_anchor: RigidBody2D = %PlayerAnchor
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@onready var line_2d: Line2D = %Line2D
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const speed = 30
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var _binded_hook_comp:SpawnHookComponet
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var m_update_rope_with_nodes: bool = false
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func init(hook_comp:SpawnHookComponet):
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_binded_hook_comp = hook_comp
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##默认以PLAYER类开始Hook
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func start_hook(hookPosition):
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anchor.global_position = hookPosition
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var player = get_tree().get_first_node_in_group("PLAYER") as CharacterBody2D
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player_anchor.global_position = player.global_position
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player.reparent(player_anchor)
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##以注册者开始Hook
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func start_hook_with_instigator(hookPosition:Vector2,instigator:Node2D):
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anchor.global_position = hookPosition
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var i = instigator
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if not i: return
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player_anchor.global_position = i.global_position
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i.reparent(player_anchor)
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##离开Hook
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func _leave_rope():
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await get_tree().create_timer(.1).timeout
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var player: Node2D
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if _binded_hook_comp:
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player = _binded_hook_comp.component_owner
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player.reparent(get_tree().current_scene)
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#player.set_active(true)
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player.rotation = 0
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queue_free()
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##此函數通過外部的修改可以驅動物體在繩子上移動。
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func move_hook(input_dir: Vector2, delta: float) -> void:
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if input_dir == Vector2.ZERO:
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return
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var distance_to_anchor := player_anchor.global_position.distance_to(anchor.global_position)
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# === 左右摆动（切向力）===
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if input_dir.x != 0.0:
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var tangent := player_anchor.global_transform.x
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player_anchor.apply_central_impulse(
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tangent * input_dir.x * speed * delta
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)
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# === 上下：改变绳长 ===
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if input_dir.y != 0.0:
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# y < 0 → 上（收绳）
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# y > 0 → 下（放绳）
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var rope_dir := player_anchor.global_transform.y as Vector2
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var rope_delta := rope_dir * input_dir.y * speed * delta * 0.5 as Vector2
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if input_dir.y > 0.0 and distance_to_anchor >= max_rope_length:
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return
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if input_dir.y < 0.0 and distance_to_anchor <= min_rope_length:
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return
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# 暂时解绑 joint，手动移动 anchor
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pin_joint_2d.node_b = NodePath("")
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player_anchor.global_position += rope_delta
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pin_joint_2d.node_b = player_anchor.get_path()
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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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##更新锚点的位置
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func update_line_anchor_pos(target_pos: Vector2) -> void:
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update_line_target_pos_with_index(0,target_pos)
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##重置所有点的位置到指定的位置
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func reset_line_points_to_target(target_pos: Vector2)-> void:
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for i in range(line_2d.points.size()):
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update_line_target_pos_with_index(i, target_pos)
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func _process(delta: float) -> void:
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##如果不更新，直接返回。
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if not m_update_rope_with_nodes: return
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update_line_target_pos_with_index(0,player_anchor.global_position)
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update_line_target_pos_with_index(1,anchor.global_position)
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