Added fade transition for scene switching

Closes #26

scripts/entities/door.gd

@@ -22,7 +22,7 @@ func _on_Area_body_enter_shape( body_id, body, body_shape, area_shape ):
 			animations.play("Double Opening", -1)
 			animations.seek(pos)
 		elif area_shape == 1: # Loading zone
-			globals.set_scene("test_level1")
+			globals.transition_scene("test_level1")
 		elif area_shape == 2: # Camera zone
 			take_camera()
 

scripts/fade_resize.gd

@@ -0,0 +1,19 @@
+extends Sprite
+
+var animations
+
+func fade_in():
+	animations.play("FadeIn")
+
+func fade_out():
+	animations.play("FadeIn", 0.5, -3, true)
+
+func _ready():
+	animations = get_node("animation")
+	set_process(true)
+
+func _process(delta):
+	var vp = get_viewport_rect().size
+	var scale = vp
+	set_scale(scale*2)
+	set_pos(scale/2)

scripts/globals.gd

@@ -6,6 +6,10 @@ var time = 0
 var rings = 0
 
 var camera
+var fade
+
+var switch_timer = null
+var next_scene_name
 
 var player = null
 var character = null
@@ -15,20 +19,27 @@ var level = null
 var paused = false
 
 func _ready():
+	var main_scene = get_tree().get_root().get_node("main")
+
 	camera = ResourceLoader.load("res://camera.scn").instance()
-	get_tree().get_root().get_node("main").add_child(camera)
+	main_scene.add_child(camera)
+
+	fade = ResourceLoader.load("res://fade.scn").instance()
+	main_scene.add_child(fade)
 
 	set_scene("test_level0")
+	fade.fade_in()
+
 	set_fixed_process(true)
 
 func _fixed_process(delta):
 	if not paused:
 		time += delta
 
 	if(Input.is_action_pressed("key_1")):
-		set_scene("test_level0")
+		transition_scene("test_level0")
 	elif(Input.is_action_pressed("key_2")):
-		set_scene("test_level1")
+		transition_scene("test_level1")
 
 func get_time_str():
 	# minutes, seconds, and milliseconds
@@ -56,6 +67,33 @@ func register_player(player_object):
 	player = player_object
 	character = player.get_node("character")
 
+func transition_scene(scene):
+	if switch_timer != null:
+		return
+
+	next_scene_name = scene
+
+	switch_timer = Timer.new()
+	switch_timer.set_wait_time(0.8)
+	switch_timer.set_one_shot(true)
+	switch_timer.set_autostart(true)
+	switch_timer.connect("timeout", self, "_on_switch_timeout")
+	add_child(switch_timer)
+
+	fade.fade_out()
+
+func _on_switch_timeout():
+	if next_scene_name == null:
+		print("WARNING: Scene switch timeout called, but there's no scene to switch to.")
+		return
+	set_scene(next_scene_name)
+
+	fade.fade_in()
+
+	switch_timer.queue_free()
+	switch_timer = null
+	next_scene_name = null
+
 func set_scene(scene):
 	# Clean up the current level if it's initialized
 	if level != null: