feat: add flashing red border when mistake is made

To aid the player with visual feedback, the main level display now
flashes red three times to inform them of mistakes.

Author: danielzting

scenes/play.tscn

@@ -55,6 +55,14 @@ margin_bottom = 1020.0
 size_flags_vertical = 3
 script = ExtResource( 3 )
 
+[node name="Label" type="Label" parent="PlayingScreen/DisplayBorder"]
+margin_left = 20.0
+margin_top = 448.0
+margin_right = 1840.0
+margin_bottom = 486.0
+text = "ready..."
+align = 1
+
 [node name="Timer" type="Timer" parent="."]
 one_shot = true
 autostart = true

scripts/border.gd

@@ -1,10 +1,32 @@
 extends MarginContainer
 
-var GREEN = Color(0.2, 1, 0.2)
-var WIDTH = 5
+const GREEN = Color(0.2, 1, 0.2)
+const RED = Color(1, 0, 0)
+const WIDTH = 5
+var color = GREEN
+var timer = Timer.new()
+const FLASHES = 3
+var color_changes = 0
 
 func _ready():
-	pass
+	# Input should be reenabled right after the last red flash
+	timer.wait_time = 1.0 / (FLASHES * 2 - 1)
+	timer.connect("timeout", self, "_on_Timer_timeout")
+	add_child(timer)
+
+func flash():
+	_on_Timer_timeout()
+	timer.start()
+
+func _on_Timer_timeout():
+	if color_changes == FLASHES * 2 - 1:
+		timer.stop()
+		color_changes = 0
+		color = GREEN
+	else:
+		color = RED if color_changes % 2 == 0 else GREEN
+		color_changes += 1
+	update()
 
 func _draw():
-	draw_rect(Rect2(Vector2(), rect_size), GREEN, false, WIDTH)
+	draw_rect(Rect2(Vector2(), rect_size), color, false, WIDTH)

scripts/play.gd

@@ -4,11 +4,6 @@ var start_time = -1
 
 func _ready():
 	$HUDBorder/HUD/Level.text = scene.get_param("level")
-	# Show ready text
-	var label = Label.new()
-	label.text = "ready..."
-	label.align = Label.ALIGN_CENTER
-	$DisplayBorder.add_child(label)
 
 func _process(delta):
 	# Show elapsed time in milliseconds
@@ -18,7 +13,7 @@ func _process(delta):
 func _on_Timer_timeout():
 	start_time = OS.get_ticks_msec()
 	# Delete ready text
-	$DisplayBorder.get_child(0).queue_free()
+	$DisplayBorder/Label.queue_free()
 	# Load level
 	var array = ArrayModel.new(10)
 	var level = getLevel(scene.get_param("level")).new(array)

views/array_view.gd

@@ -25,4 +25,4 @@ func _process(delta):
 		rects[i].rect_size.y = rect_size.y * level.array.get(i) / level.array.size
 
 func _on_Level_mistake():
-	pass
+	get_parent().flash()