work2.py

def isValidMove(board, move):
    blankx, blanky = getBlankPosition(board)
    return (move == UP and blanky != len(board[0]) - 1) or \
           (move == DOWN and blanky != 0) or \
           (move == LEFT and blankx != len(board) - 1) or \
           (move == RIGHT and blankx != 0)


def getRandomMove(board, lastMove=None):
     #start with a full list of all 4 moves
    validMoves = [UP, DOWN, LEFT, RIGHT]

    #remove moves from the list as they are disqualified
    if lastMove == UP or not isValidMove(board, DOWN):
        validMoves.remove(DOWN)
    if lastMove == DOWN or not isValidMove(board, UP):
        validMoves.remove(UP)
    if lastMove == LEFT or not isValidMove(board, RIGHT):
        validMoves.remove(RIGHT)
    if lastMove == RIGHT or not isValidMove(board, LEFT):
        validMoves.remove(LEFT)

    #return a random move from the list of remaining moves
    return random.choice(validMoves)


def getLeftTopOfTile(tileX, tileY):
    #converts board coordinates to pixel coordinates
    left = XMARGIN + (tileX * TILESIZE) + (tileX - 1)
    top = YMARGIN + (tileY * TILESIZE) + (tileY - 1)
    return (left, top)

def getSpotClicked(board, x, y):
     # from the x & y pixel coordinates, get the x & y board coordinates
     for tileX in range(len(board)):
         for tileY in range(len(board[0])):
             left, top = getLeftTopOfTile(tileX, tileY)
             tileRect = pygame.Rect(left, top, TILESIZE, TILESIZE)
             if tileRect.collidepoint(x, y):
                 return (tileX, tileY)
    return (None, None)


def drawTile(tilex, tiley, number, adjx=0, adjy=0):
    # draw a tile at board coordinates tilex and tiley
    left, top = getLeftTopOfTile(tilex, tiley)
    pygame.draw.rect(DISPLAYSURF, TILECOLOR, (left + adjx, top + adjy, TILESIZE, TILESIZE))
    textSurf = BASICFONT.render(str(number), True, TEXTCOLOR)
    textRect = textSurf.get_rect()
    textRect.center = left + int(TILESIZE / 2) + adjx, top + int(TILESIZE / 2) + adjy
    DISPLAYSURF.blit(textSurf, textRect)