fix

scripts/train.gd

@@ -38,6 +38,7 @@ var distance_traveled: float = 0.0
 var locomotive: Node3D
 var wagons: Array = []
 var wagon_distances: Array = []
+var _horn_player: AudioStreamPlayer
 
 
 func _ready() -> void:
@@ -46,6 +47,7 @@ func _ready() -> void:
 	await get_tree().process_frame
 	_create_train()
 	current_speed = base_speed
+	_create_horn()
 
 
 func _remove_train():
@@ -144,6 +146,9 @@ 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"):
+		_play_horn()
 
 func _update_movement(delta: float) -> void:
 	distance_traveled += current_speed * delta
@@ -187,3 +192,54 @@ 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 := 22050
+	var duration := 1.8
+	var num_samples := int(sample_rate * duration)
+	
+	var audio := AudioStreamWAV.new()
+	audio.format = AudioStreamWAV.FORMAT_16_BITS
+	audio.mix_rate = sample_rate
+	audio.stereo = false
+	
+	var data := PackedByteArray()
+	data.resize(num_samples * 2)
+	
+	var freq1 := 277.0  # C#4
+	var freq2 := 370.0  # F#4
+	var freq3 := 311.0  # Eb4
+	
+	for i in num_samples:
+		var t := float(i) / sample_rate
+		var envelope := 1.0
+		if t < 0.15:
+			envelope = t / 0.15
+		elif t > duration - 0.4:
+			envelope = (duration - t) / 0.4
+		envelope = clampf(envelope, 0.0, 1.0)
+		
+		var sample := sin(t * freq1 * TAU) * 0.4
+		sample += sin(t * freq2 * TAU) * 0.3
+		sample += sin(t * freq3 * TAU) * 0.2
+		sample += sin(t * freq1 * 2.0 * TAU) * 0.1
+		sample *= envelope
+		
+		var value := clampi(int(sample * 24000.0), -32768, 32767)
+		data[i * 2] = value & 0xFF
+		data[i * 2 + 1] = (value >> 8) & 0xFF
+	
+	audio.data = data
+	_horn_player.stream = audio
+
+
+func _play_horn() -> void:
+	if _horn_player and not _horn_player.playing:
+		_horn_player.play()