feat: 场景与核心玩法脚本（双机型/波次/Boss/道具/炸弹/地面单位/浮游炮激光）

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
2026-08-31 00:31:29 +08:00
parent 024447fbda
commit 3c6f31b503
36 changed files with 1692 additions and 0 deletions
@@ -0,0 +1,73 @@
+class_name EnemyBase
+extends Area2D
+## 敌机基类：血量、受击闪白、死亡结算与爆炸。
+
+var hp := 1
+var score_value := 100
+var dead := false
+var drops_powerup := false
+## 激光命中判定的近似半径（水平覆盖 + 垂直截断）
+var hit_radius := 16.0
+
+
+func apply_damage(dmg: int) -> void:
+	if dead:
+		return
+	hp -= dmg
+	if hp <= 0:
+		dead = true
+		_die()
+	else:
+		_flash()
+
+
+func _die() -> void:
+	_spawn_drop()
+	var game := get_tree().get_first_node_in_group("game") as Game
+	if game != null:
+		game.add_score(score_value)
+		game.spawn_explosion(global_position, 1.0)
+	queue_free()
+
+
+## 死亡时按标记掉落道具（可能在物理信号回调中调用，需延迟入树）。
+## forced 为 -1 时随机 P/B（各 50%）。
+func _spawn_drop(forced := -1) -> void:
+	if not drops_powerup:
+		return
+	var container := get_tree().get_first_node_in_group("powerups")
+	if container == null:
+		return
+	var pickup := Powerup.new()
+	pickup.position = global_position
+	if forced >= 0:
+		pickup.kind = forced
+	else:
+		pickup.kind = Powerup.Kind.BOMB if randf() < 0.5 else Powerup.Kind.POWER
+	container.call_deferred("add_child", pickup)
+
+
+func _flash() -> void:
+	modulate = Color(3.0, 3.0, 3.0)
+	create_tween().tween_property(self, "modulate", Color.WHITE, 0.12)
+
+
+## 朝玩家方向的单位向量；玩家不存在或不活跃时朝正下方
+func _aim_direction() -> Vector2:
+	var game := get_tree().get_first_node_in_group("game") as Game
+	if game != null and is_instance_valid(game.player) and game.player.active:
+		var to_player: Vector2 = game.player.global_position - global_position
+		if to_player.length() > 1.0:
+			return to_player.normalized()
+	return Vector2.DOWN
+
+
+## 向敌方弹幕容器发射一发子弹
+func _fire_bullet(velocity: Vector2, muzzle_offset := Vector2(0.0, 14.0)) -> void:
+	var container := get_tree().get_first_node_in_group("enemy_bullets")
+	if container == null:
+		return
+	var bullet := EnemyBullet.new()
+	bullet.velocity = velocity
+	container.add_child(bullet)
+	bullet.global_position = global_position + muzzle_offset