massive work towards godot 4

scripts/title_screen.gd

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+extends Control
+
+@export
+var music: AudioStream
+
+@export
+var new_game_scene: PackedScene
+
+var fade_to: PackedScene
+
+func _ready():
+	MusicPlayer.stop()
+	MusicPlayer.stream = music
+	MusicPlayer.volume_db = 0
+	MusicPlayer.play()
+	$Fader.modulate.a = 1
+	$CreditsMenu.hide()
+
+	$"New Game".connect("button_down",Callable(self,"new_game"))
+	$Credits.connect("button_down",Callable(self,"show_credits"))
+	$Quit.connect("button_down",Callable(self,"on_quit_down"))
+
+	fade_out(3, 1, -1)
+
+func new_game():
+	SaveManager.add_run()
+	fade_to = new_game_scene
+	fade_out(3, -80)
+
+func show_credits():
+	$CreditsMenu.show()
+
+func on_quit_down():
+	get_tree().quit()
+
+
+var timePassed = 0 #Current amount of time spend displaying te
+const CHECK_LENGTH = 0.05 #Interval to check for updates
+var timeNeeded = 0 #Time that it takes to display the text
+var fadeTimer #Timer object
+
+var multiplier = 1
+var adder = 0
+func fade_out(seconds, multi = 1, add = 0):
+	multiplier = multi
+	adder = add
+	timeNeeded = seconds
+	timePassed = 0
+	if(!fadeTimer):
+		fadeTimer = Timer.new()
+		add_child(fadeTimer)
+		fadeTimer.connect("timeout",Callable(self,"on_fade_timeout"))
+	fadeTimer.start(CHECK_LENGTH)
+
+func on_fade_timeout():
+	timePassed += CHECK_LENGTH
+	MusicPlayer.volume_db = multiplier * (timePassed/timeNeeded)
+	$Fader.modulate.a = abs(timePassed/timeNeeded + adder)
+	if(timePassed >= timeNeeded):
+		fadeTimer.stop()
+		if($Fader.modulate.a > 0.5):
+			get_tree().change_scene_to_packed(fade_to)
+	else:
+		fadeTimer.start(CHECK_LENGTH)
+	pass