Use absolute angle turn

Fix angle errors when hitting a turning key when a rotation was already
in progress.

CharTween.gd

@@ -1,6 +1,6 @@
 extends Tween
 
-export var duration = 0.75
+export var duration = 0.1
 
 # Called when the node enters the scene tree for the first time.
 func _ready():
@@ -14,6 +14,6 @@ func move_char(c, t_pos):
 	interpolate_property(c, "position", c.get_position(), t_pos, duration, Tween.TRANS_LINEAR, Tween.EASE_OUT_IN)
 	pass
 
-func rotate_char(c, t_rot):
-	interpolate_property(c, "rotation_degrees", c.rotation_degrees, t_rot, duration, Tween.TRANS_LINEAR, Tween.EASE_OUT)
+func rotate_char(c, from, to):
+	interpolate_property(c, "rotation_degrees", from, to, duration, Tween.TRANS_LINEAR, Tween.EASE_OUT)
 	pass

Player.gd

@@ -58,16 +58,10 @@ func _ready():
 func _unhandled_input(event):
 	if event.is_pressed():
 		if event.is_action(turn_left_action):
-			tween.rotate_char(self, rotation_degrees - 90)
-			tween.start()
-
-			dire_delta = Side.LEFT
+			turn(Side.LEFT)
 			get_tree().set_input_as_handled()
 		elif event.is_action(turn_right_action):
-			tween.rotate_char(self, rotation_degrees + 90)
-			tween.start()
-
-			dire_delta = Side.RIGHT
+			turn(Side.RIGHT)
 			get_tree().set_input_as_handled()
 
 func _on_game_start():
@@ -80,11 +74,22 @@ func _on_tween_completed(_o, key):
 func _on_crash(body):
 	die()
 	generate_wall()
+	# TODO : use enum for blocks
 	grid.set_cell(posix, posiy, 2)
 
 func generate_wall():
+	# TODO : use enum for blocks
 	grid.set_cell(posix - dirx, posiy - diry, 1)
 
+func turn(left_or_right:int):
+	var current_angle = dire * 90
+	var aim_angle = current_angle + 90 * left_or_right
+
+	tween.rotate_char(self, current_angle, aim_angle)
+	tween.start()
+
+	dire_delta = left_or_right
+
 func move():
 	if !alive:
 		return

Player.tscn

@@ -24,5 +24,4 @@ __meta__ = {
 
 [node name="Tween" type="Tween" parent="."]
 script = ExtResource( 3 )
-duration = 0.1
 [connection signal="body_entered" from="." to="." method="_on_crash"]