Merge branch 'master' of hongabar.org:robotgame

.gitignore

@@ -1,3 +1,2 @@
 *~
-*.pyc
+*.py[co]
-*.pyo

robotgame/logic/direction.py

@@ -53,13 +53,9 @@ class Left(Direction):
         x, y = pos
         return x - 1, y
 
-succ = {Up:    Right,
+all_directions = set((Up, Left, Down, Right))
-        Right: Down,
-        Down:  Left,
-        Left:  Up}.__getitem__
 
-pred = {Right: Up,
+succ = lambda d: all_directions[(all_directions.index(d) + 1) % 4]
-        Down:  Right,
+pred = lambda d: all_directions[(all_directions.index(d) - 1) % 4]
-        Left:  Down,
-        Up:    Left}.__getitem__
 
+isDirection = lambda obj: obj in (Up, Left, Down, Right)