Transition

scripts/singletons/Transition.gd

@@ -0,0 +1,79 @@
+class_name TransitionSingleton extends Control
+
+enum FadeType {
+	NONE,
+	FADE_IN,
+	FADE_OUT
+}
+
+signal fadeOutStart
+signal fadeOutEnd
+signal fadeInStart
+signal fadeInEnd
+signal fadeUpdate(t:float)
+
+var fadeType:FadeType = FadeType.NONE
+var fadeDuration:float = 0.4
+var fadeTime:float = 0.0
+
+func _enter_tree() -> void:
+	$Overlay.visible = false
+
+func _process(delta: float) -> void:
+	if fadeType == FadeType.NONE:
+		return
+
+	fadeTime += delta
+	var t:float = fadeTime / fadeDuration
+
+	# Get destination alpha type.
+	var destAlpha:float = 0.0
+	var srcAlpha:float
+	if fadeType == FadeType.FADE_IN:
+		srcAlpha = 1.0
+		destAlpha = 0.0
+	elif fadeType == FadeType.FADE_OUT:
+		srcAlpha = 0.0
+		destAlpha = 1.0
+
+	# End?
+	if t >= 1.0:
+		fadeUpdate.emit(1.0)
+		var cFade = fadeType
+		print("Transition: Fade complete")
+		fadeType = FadeType.NONE
+
+		if cFade == FadeType.FADE_OUT:
+			$Overlay.visible = true
+			fadeOutEnd.emit()
+		elif cFade == FadeType.FADE_IN:
+			$Overlay.visible = false
+			fadeInEnd.emit()
+		
+		$Overlay.color.a = destAlpha
+		return
+
+	# TODO: Use curves
+	$Overlay.color.a = srcAlpha + (destAlpha - srcAlpha) * t
+	fadeUpdate.emit(t)
+	pass
+
+func fade(
+	fade:FadeType = FadeType.FADE_IN,
+	duration:float = 0.4,
+	color:Color = Color(0, 0, 0, 1),
+):
+	$Overlay.visible = false
+	$Overlay.color = color
+	fadeDuration = duration
+	fadeTime = 0
+	fadeType = fade
+
+	if fade == FadeType.FADE_IN:
+		fadeInStart.emit()
+		$Overlay.color.a = 0
+	elif fade == FadeType.FADE_OUT:
+		fadeOutStart.emit()
+		$Overlay.color.a = 1
+
+	$Overlay.visible = true