Update 2D navigation demos

2d/navigation/navigation.gd

@@ -1,46 +1,44 @@
 extends Navigation2D
 
-export(float) var CHARACTER_SPEED = 400.0
+export(float) var character_speed = 400.0
 var path = []
 
+func _process(delta):
+	var walk_distance = character_speed * delta
+	move_along_path(walk_distance)
+
+
 # The 'click' event is a custom input action defined in
-# Project > Project Settings > Input Map tab
+# Project > Project Settings > Input Map tab.
 func _input(event):
-	if not event.is_action_pressed('click'):
+	if not event.is_action_pressed("click"):
 		return
 	_update_navigation_path($Character.position, get_local_mouse_position())
 
 
-func _update_navigation_path(start_position, end_position):
-	# get_simple_path is part of the Navigation2D class
-	# it returns a PoolVector2Array of points that lead you from the
-	# start_position to the end_position
-	path = get_simple_path(start_position, end_position, true)
-	# The first point is always the start_position
-	# We don't need it in this example as it corresponds to the character's position
-	path.remove(0)
-	set_process(true)
-
-
-func _process(delta):
-	var walk_distance = CHARACTER_SPEED * delta
-	move_along_path(walk_distance)
-
-
 func move_along_path(distance):
 	var last_point = $Character.position
 	while path.size():
 		var distance_between_points = last_point.distance_to(path[0])
-
-		# the position to move to falls between two points
+		# The position to move to falls between two points.
 		if distance <= distance_between_points:
 			$Character.position = last_point.linear_interpolate(path[0], distance / distance_between_points)
 			return
-
-		# the position is past the end of the segment
+		# The position is past the end of the segment.
 		distance -= distance_between_points
 		last_point = path[0]
 		path.remove(0)
-	# the character reached the end of the path
+	# The character reached the end of the path.
 	$Character.position = last_point
 	set_process(false)
+
+
+func _update_navigation_path(start_position, end_position):
+	# get_simple_path is part of the Navigation2D class.
+	# It returns a PoolVector2Array of points that lead you
+	# from the start_position to the end_position.
+	path = get_simple_path(start_position, end_position, true)
+	# The first point is always the start_position.
+	# We don't need it in this example as it corresponds to the character's position.
+	path.remove(0)
+	set_process(true)