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79 lines
3.0 KiB
79 lines
3.0 KiB
extends CharacterBody2D
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## 球：未发射时停在挡板上，空格发射后在场地内反弹。
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##
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## 反弹规则：
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## - 撞墙/砖块：镜面反射（用 collision.get_normal()）
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## - 撞挡板：按击中挡板的横向偏移换算反弹角度——挡板中心=竖直反弹，
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## 越靠边缘反弹角越大（打砖块手感的核心）。
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## - 球速随击砖次数缓慢上升，到 max_speed 封顶。
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signal lost ## 球出界
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signal brick_hit(brick) ## 命中砖块（用于计连击/提速）
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@export var speed: float = 400.0 ## 初始球速
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@export var max_speed: float = 700.0 ## 球速上限
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@export var speed_gain_per_hit: float = 4.0 ## 每击碎一砖后提速
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@export var spawn_offset_y: float = -24.0 ## 球相对挡板的垂直偏移
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@export var launch_angle_deg: float = 60.0 ## 初始发射角度
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@export var max_bounce_angle_deg: float = 75.0 ## 挡板最大反弹角（中心绝对值）
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@onready var _paddle: CharacterBody2D = get_parent().get_node("Paddle")
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var _launched: bool = false
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var _current_speed: float = 0.0
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func _ready() -> void:
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_current_speed = speed
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velocity = Vector2.ZERO
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func _physics_process(_delta: float) -> void:
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if not _launched:
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# 跟随挡板
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position.x = _paddle.position.x
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position.y = _paddle.position.y + spawn_offset_y
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if Input.is_key_pressed(KEY_SPACE):
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_launch()
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return
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# 已发射：每帧移动并检测碰撞
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var motion: Vector2 = velocity * _delta
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var collision: KinematicCollision2D = move_and_collide(motion)
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if collision:
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var body := collision.get_collider()
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# 命中挡板：按击中位置算反弹角度
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if body == _paddle:
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_bounce_off_paddle(collision)
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else:
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# 撞墙/砖块：镜面反射
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velocity = velocity.bounce(collision.get_normal())
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velocity.x += randf_range(-5.0, 5.0)
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# 命中砖块：转给 main 并提速
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if body and body.is_in_group("bricks"):
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brick_hit.emit(body)
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_current_speed = min(_current_speed + speed_gain_per_hit, max_speed)
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velocity = velocity.normalized() * _current_speed
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func _bounce_off_paddle(collision: KinematicCollision2D) -> void:
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# 球相对挡板中心的横向偏移，归一化到 [-1, 1]
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# 挡板加宽时，半宽从 paddle 实时读
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var half_paddle: float = _paddle.get_half_width() if _paddle.has_method("get_half_width") else 48.0
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var offset: float = clamp(
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(position.x - _paddle.position.x) / half_paddle, -1.0, 1.0
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)
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# 偏移 → 反弹角（0 = 竖直，max_bounce_angle_deg = 边缘）
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var angle_rad: float = deg_to_rad(offset * max_bounce_angle_deg)
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# 球只能向上飞（-Y 方向）
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velocity = Vector2(sin(angle_rad), -cos(angle_rad)) * _current_speed
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func _launch() -> void:
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_launched = true
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var rad: float = deg_to_rad(launch_angle_deg)
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var dir_x: float = [-1.0, 1.0][randi() % 2]
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velocity = Vector2(cos(rad) * dir_x, -sin(rad)) * _current_speed
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func reset_to_paddle() -> void:
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_launched = false
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_current_speed = speed
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velocity = Vector2.ZERO
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position.x = _paddle.position.x
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position.y = _paddle.position.y + spawn_offset_y
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