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py2048.py
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py2048.py
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import numpy
import pprint
import random
import datetime
__author__ = 'Alex Pinkney'
DIRS = {
'UP',
'RIGHT',
'LEFT',
'DOWN',
}
VERTICAL = {'UP', 'DOWN'}
HORIZONTAL = {'LEFT', 'RIGHT'}
REVERSED = {'DOWN', 'RIGHT'}
pp = pprint.PrettyPrinter(indent=4)
class Board:
def __init__(self, size_x=4, size_y=4, start_nums=2):
self.board = numpy.array([0] * (size_x * size_y)).reshape((size_x, size_y))
self.prob_2 = 0.9
self.score = 0
for _ in xrange(start_nums):
self._insert_random()
def __str__(self):
return pp.pformat(self.board)
def get_legal_moves(self):
return filter(lambda d: self._get_legality(d), DIRS)
def _get_legality(self, direction):
"""
A move is said to be legal if at least one of the following applies:
- at least one column/row (dependent on direction) has adjacent similar nonzero values
- ie numbers can be collapsed
- there is at least one zero value separated from the far edge by a nonzero value
- ie numbers can slide
"""
if direction not in DIRS:
raise Exception("Bad direction '%s'" % direction)
if self._can_slide(direction):
return True
return self._can_collapse(direction)
@staticmethod
def _can_slide_row_left(row):
seen_zero = False
for val in row:
if seen_zero and val:
return True
if not val:
seen_zero = True
return False
@staticmethod
def _can_collapse_row(row):
last_seen = 0
for val in row:
if val and val == last_seen:
return True
if val:
last_seen = val
return False
def _can_slide(self, direction):
size_x, size_y = self.board.shape
if direction in HORIZONTAL:
indices = xrange(size_x)
else:
indices = xrange(size_y)
for i in indices:
if self._can_slide_row_left(self._get_list(direction, i)):
return True
return False
def _can_collapse(self, direction):
size_x, size_y = self.board.shape
if direction in HORIZONTAL:
indices = xrange(size_x)
else:
indices = xrange(size_y)
for i in indices:
if self._can_collapse_row(self._get_list(direction, i)):
return True
return False
def _get_list(self, direction, index):
if direction in HORIZONTAL:
ls = self.board[index, :].tolist()
else:
ls = self.board[:, index].tolist()
if direction in REVERSED:
ls.reverse()
return ls
def _get_empty_cells(self):
size_x, size_y = self.board.shape
empties = []
for x in xrange(size_x):
for y in xrange(size_y):
if not self.board[x][y]:
empties.append((x, y))
return empties
def _insert_random(self):
x, y = random.choice(self._get_empty_cells())
if random.random() <= self.prob_2:
num = 2
else:
num = 4
self.board[x][y] = num
def _collapse_row(self, direction, index):
points, new_row = self._get_collapsed_left_row(self._get_list(direction, index))
self.score += points
if direction in REVERSED:
new_row.reverse()
# Write it back to the board
# TODO: Find out if narrays support sliced assignment
for i, val in enumerate(new_row):
if direction in HORIZONTAL:
self.board[index][i] = val
else:
self.board[i][index] = val
@staticmethod
def _get_collapsed_left_row(row):
points = 0
new_row = filter(None, row)
runs = []
v = 0
c = 1
for val in new_row:
if val == v:
c += 1
elif v:
runs.append((v, c))
c = 1
v = val
if v:
runs.append((v, c))
new_row = []
for v, c in runs:
new_row.extend([v * 2] * (c // 2))
points += (v * 2) * (c // 2)
if c % 2 == 1:
new_row.append(v)
if len(new_row) < len(row):
new_row.extend([0] * (len(row) - len(new_row)))
return points, new_row
def move(self, direction):
if not self._get_legality(direction):
return False
size_x, size_y = self.board.shape
if direction in HORIZONTAL:
indices = xrange(size_x)
else:
indices = xrange(size_y)
for i in indices:
self._collapse_row(direction, i)
self._insert_random()
return True
def main():
board = Board(size_x=8, size_y=8)
print str(board)
nmoves = 0
start_time = datetime.datetime.now()
while True:
moves = board.get_legal_moves()
if not moves:
break
board.move(random.choice(moves))
nmoves += 1
if nmoves % 10000 == 0:
print "After %s moves and %s:" % (nmoves, datetime.datetime.now() - start_time)
print str(board)
print board.score
print "Game over! Score was %s from %s moves" % (board.score, nmoves)
print str(board)
print "Took %s" % (datetime.datetime.now() - start_time,)
if __name__ == '__main__':
main()