118 lines
2.5 KiB
GDScript
118 lines
2.5 KiB
GDScript
class_name Rock
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extends CharacterBody2D
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## ===== 配置 =====
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@export var falling_gravity: float = 2000.0
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@export var max_fall_speed: float = 3000.0
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@export var kill_y: float = 10000000.0
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@export var shake_x := 2.0
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@export var shake_y := 2.0
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@export var step_time := 0.034
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@export var binded_rock_texture: Node2D
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## ===== 常量 =====
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const NO_TARGET_Y: float = 1e20
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## ===== 状态 =====
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var is_falling: bool = false
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var fall_target_y: float = NO_TARGET_Y
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## ===== 抖动量 =====
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var _shake_tween: Tween
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var _shake_origin_pos: Vector2
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##岩石开始抖动
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func start_shaking() -> void:
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var sprite := $Sprite2D
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if binded_rock_texture: sprite = binded_rock_texture
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if not sprite:
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return
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# 防止重复启动
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if _shake_tween and _shake_tween.is_running():
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return
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_shake_origin_pos = sprite.position
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_shake_tween = create_tween()
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_shake_tween.set_loops() # 无限循环
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_shake_tween.set_trans(Tween.TRANS_SINE)
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_shake_tween.set_ease(Tween.EASE_IN_OUT)
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# 左上 → 右下 → 左下 → 右上（循环更自然）
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_shake_tween.tween_property(
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sprite,
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"position",
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_shake_origin_pos + Vector2(-shake_x, -shake_y),
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step_time
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)
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_shake_tween.tween_property(
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sprite,
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"position",
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_shake_origin_pos + Vector2(shake_x, shake_y),
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step_time
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)
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_shake_tween.tween_property(
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sprite,
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"position",
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_shake_origin_pos + Vector2(-shake_x, shake_y),
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step_time
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)
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_shake_tween.tween_property(
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sprite,
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"position",
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_shake_origin_pos + Vector2(shake_x, -shake_y),
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step_time
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)
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##岩石结束抖动
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func stop_shaking() -> void:
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var sprite := $Sprite2D
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if not sprite:
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return
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if _shake_tween:
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_shake_tween.kill()
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_shake_tween = null
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# 强制回到原位，防止残留偏移
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sprite.position = _shake_origin_pos
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## 开始下落（可指定目标）
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func start_falling(target_y: float = NO_TARGET_Y) -> void:
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is_falling = true
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fall_target_y = target_y
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velocity = Vector2.ZERO
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func _physics_process(delta: float) -> void:
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if not is_falling:
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return
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_update_fall(delta)
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func _update_fall(delta: float) -> void:
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## 速度积分
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velocity.y += falling_gravity * delta
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velocity.y = min(velocity.y, max_fall_speed)
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## 预测下一帧位置
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var next_y: float = global_position.y + velocity.y * delta
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## 到达目标 / kill
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var limit_y: float = min(fall_target_y, kill_y)
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if next_y >= limit_y:
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global_position.y = limit_y
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_on_fall_finished()
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return
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move_and_slide()
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func _on_fall_finished() -> void:
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is_falling = false
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queue_free() # 或者变成平台 / 播动画
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