First (and I hope last) commit

Balloon.gd

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+extends Area2D
+
+signal pop
+
+var increase # speed ratio
+var current_color # name of current animation (sprite set) of AnimatedSprite
+var random = RandomNumberGenerator.new() # randomizer
+# harcoded names of AnimatedSprite's animations
+const colors = ['blue', 'green', 'orange', 'pink', 'purple', 'red', 'yellow']
+
+# Get random animation except current one
+func get_color():
+	var new_color = colors[random.randi_range(0, colors.size() - 1)]
+	if new_color == current_color:
+		new_color = get_color()
+	return new_color
+
+# Hide balloon when its pop sound is finished
+func hide_balloon():
+	print("Sound finished")
+	queue_free()
+
+# Initialize scene
+func _init():
+	random.randomize()
+	current_color = get_color()
+	increase = random.randf_range(1, 1.75)
+
+# When node tree has been created and initialized
+func _ready():
+	# set random sprite set to balloon
+	$AnimatedSprite.set_animation(current_color)
+	print("New balloon: ", current_color)
+	# connect "pop" signal to handler in Playground 
+	connect('pop', get_parent(), 'update_score')
+	# the "finished" signal of every PopSoundN must hide current balloon
+	for i in range(1, 5):
+		get_node('PopSound' + str(i)).connect('finished', self, 'hide_balloon')
+
+# On every Timer's interval we move current balloon up
+func _on_Timer_timeout():
+	position.y -= increase
+	# we need to detect how far balloon from upper edge is and destroy it
+	# ballon becomes invisible when its first scaled frame height totally above Playground
+	var height = $AnimatedSprite.frames.get_frame(current_color, 0).get_size().y * scale.y
+	var y = position.y + height
+	if y < 0:
+		print("Die (out of playground at ", position.y, ")")
+		queue_free()
+
+# Detect click/touch event on balloon
+func _on_Balloon_input_event(_viewport, event, _shape_idx):
+	if event is InputEventMouseButton or event is InputEventScreenTouch:
+		if event.is_pressed():
+			print("Click: ", event.as_text())
+			# start pop animation
+			$AnimatedSprite.play()
+			# play pop sound
+			var sound_idx = random.randi_range(1, 5)
+			get_node("PopSound" + str(sound_idx)).play()
+			print("Sound started: ", sound_idx)
+			# emit poop signal so that we can increase score counter in Playground
+			emit_signal('pop')