def _cross_left_or_right(self, edge_piece, face_piece, face_color, move_1,
move_2):
# don't do anything if piece is in correct place
if (edge_piece.pos == (face_piece.pos.x, face_piece.pos.y, 1)
and edge_piece.colors[2] == self.cube.front_color()):
return
# ensure piece is at z = -1
undo_move = None
if edge_piece.pos.z == 0:
pos = Point(edge_piece.pos)
pos.x = 0 # pick the UP or DOWN face
cw, cc = cube.get_rot_from_face(pos)
if edge_piece.pos in (cube.LEFT + cube.UP, cube.RIGHT + cube.DOWN):
self.move(cw)
undo_move = cc
else:
self.move(cc)
undo_move = cw
elif edge_piece.pos.z == 1:
pos = Point(edge_piece.pos)
pos.z = 0
cw, cc = cube.get_rot_from_face(pos)
self.move("{0} {0}".format(cc))
# don't set the undo move if the piece starts out in the right position
# (with wrong orientation) or we'll screw up the remainder of the algorithm
if edge_piece.pos.x != face_piece.pos.x:
undo_move = "{0} {0}".format(cw)
assert edge_piece.pos.z == -1
# piece is at z = -1, rotate to correct face (LEFT or RIGHT)
count = 0
while (edge_piece.pos.x, edge_piece.pos.y) != (face_piece.pos.x,
face_piece.pos.y):
self.move("B")
count += 1
if count == 10:
raise Exception("Stuck in loop - unsolvable cube?\n" +
str(self.cube))
# if we moved a correctly-placed piece, restore it
if undo_move:
self.move(undo_move)
# the piece is on the correct face on plane z = -1, but has two orientations
if edge_piece.colors[0] == face_color:
self.move(move_1)
else:
self.move(move_2)
def _cross_left_or_right(self, edge_piece, face_piece, face_color, move_1, move_2):
if (edge_piece.pos == (face_piece.pos.x, face_piece.pos.y, 1)
and edge_piece.colors[2] == self.cube.front_color()):
return
undo_move = None
if edge_piece.pos.z == 0:
pos = Point(edge_piece.pos)
pos.x = 0
cw, cc = cube.get_rot_from_face(pos)
if edge_piece.pos in (cube.LEFT + cube.UP, cube.RIGHT + cube.DOWN):
self.move(cw)
undo_move = cc
else:
self.move(cc)
undo_move = cw
elif edge_piece.pos.z == 1:
pos = Point(edge_piece.pos)
pos.z = 0
cw, cc = cube.get_rot_from_face(pos)
self.move("{0} {0}".format(cc))
# don't set the undo move if the piece starts out in the right position
if edge_piece.pos.x != face_piece.pos.x:
undo_move = "{0} {0}".format(cw)
assert edge_piece.pos.z == -1
#rotate to correct face (LEFT or RIGHT)
count = 0
while (edge_piece.pos.x, edge_piece.pos.y) != (face_piece.pos.x, face_piece.pos.y):
self.move("B")
count += 1
if count == 10:
raise Exception("Stuck in loop - unsolvable cube?\n" + str(self.cube))
# if we moved a correctly-placed piece, restore it
if undo_move:
self.move(undo_move)
if edge_piece.colors[0] == face_color:
self.move(move_1)
else:
self.move(move_2)