add sky to train scene

scripts/train.gd

@@ -38,6 +38,8 @@ var distance_traveled: float = 0.0
 var locomotive: Node3D
 var wagons: Array = []
 var wagon_distances: Array = []
+var _horn_player: AudioStreamPlayer
+var _horn_playing: bool = false
 
 
 func _ready() -> void:
@@ -46,6 +48,7 @@ func _ready() -> void:
 	await get_tree().process_frame
 	_create_train()
 	current_speed = base_speed
+	_create_horn()
 
 
 func _remove_train():
@@ -144,6 +147,9 @@ func _handle_input(delta: float) -> void:
 	elif Input.is_action_pressed("change_train"):
 		_create_train()
 		current_speed = base_speed
+	
+	if Input.is_action_just_pressed("horn") and not _horn_playing:
+		_play_horn()
 
 func _update_movement(delta: float) -> void:
 	distance_traveled += current_speed * delta
@@ -187,3 +193,56 @@ func get_locomotive_position() -> Vector3:
 
 func get_speed() -> float:
 	return current_speed
+
+
+func _create_horn() -> void:
+	_horn_player = AudioStreamPlayer.new()
+	_horn_player.name = "HornPlayer"
+	_horn_player.volume_db = -6.0
+	_horn_player.bus = "Master"
+	add_child(_horn_player)
+	
+	var sample_rate: int = 22050
+	var duration: float = 1.8
+	var num_samples: int = int(sample_rate * duration)
+	var fade_in: float = 0.15
+	var fade_out: float = 0.4
+	
+	var freqs: Array[float] = [277.18, 369.99, 311.13]
+	
+	var data := PackedByteArray()
+	data.resize(num_samples * 2)
+	
+	for i in range(num_samples):
+		var t: float = float(i) / sample_rate
+		var sample: float = 0.0
+		for freq in freqs:
+			sample += sin(TAU * freq * t)
+		sample /= freqs.size()
+		
+		var envelope: float = 1.0
+		if t < fade_in:
+			envelope = t / fade_in
+		elif t > duration - fade_out:
+			envelope = (duration - t) / fade_out
+		sample *= envelope
+		
+		var value: int = clampi(int(sample * 16000), -32768, 32767)
+		data[i * 2] = value & 0xFF
+		data[i * 2 + 1] = (value >> 8) & 0xFF
+	
+	var stream := AudioStreamWAV.new()
+	stream.format = AudioStreamWAV.FORMAT_16_BITS
+	stream.mix_rate = sample_rate
+	stream.data = data
+	_horn_player.stream = stream
+
+
+func _play_horn() -> void:
+	_horn_playing = true
+	_horn_player.play()
+	_horn_player.finished.connect(_on_horn_finished, CONNECT_ONE_SHOT)
+
+
+func _on_horn_finished() -> void:
+	_horn_playing = false

scripts/trainjourney.gd

@@ -51,6 +51,11 @@ func _process(_delta: float) -> void:
 	
 	if Input.is_action_just_pressed("ui_cancel"):
 		SceneSwitcher.switch_scene(main_scene.resource_path)
+	
+	if Input.is_action_just_pressed("toggle_debug"):
+		var sky := get_node_or_null("DynamicSky") as DynamicSkyRoot
+		if sky and sky._debug_canvas_layer:
+			sky._debug_canvas_layer.visible = not sky._debug_canvas_layer.visible
 
 
 func _update_ui() -> void: