#44
Maze Runner 2D

  1. """Maze Runner 2D, by Al Sweigart [email protected]
  2. Move around a maze and try to escape. Maze files are generated by
  3. mazemakerrec.py.
  4. This code is available at https://nostarch.com/big-book-small-python-programming
  5. Tags: large, game, maze"""
  6. 
  7. import sys, os
  8. 
  9. # Maze file constants:
 10. WALL = '#'
 11. EMPTY = ' '
 12. START = 'S'
 13. EXIT = 'E'
 14. 
 15. PLAYER = '@'  # (!) Try changing this to '+' or 'o'.
 16. BLOCK = chr(9617)  # Character 9617 is '░'
 17. 
 18. 
 19. def displayMaze(maze):
 20.     # Display the maze:
 21.     for y in range(HEIGHT):
 22.         for x in range(WIDTH):
 23.             if (x, y) == (playerx, playery):
 24.                 print(PLAYER, end='')
 25.             elif (x, y) == (exitx, exity):
 26.                 print('X', end='')
 27.             elif maze[(x, y)] == WALL:
 28.                 print(BLOCK, end='')
 29.             else:
 30.                 print(maze[(x, y)], end='')
 31.         print()  # Print a newline after printing the row.
 32. 
 33. 
 34. print('''Maze Runner 2D, by Al Sweigart [email protected]
 35. 
 36. (Maze files are generated by mazemakerrec.py)''')
 37. 
 38. # Get the maze file's filename from the user:
 39. while True:
 40.     print('Enter the filename of the maze (or LIST or QUIT):')
 41.     filename = input('> ')
 42. 
 43.     # List all the maze files in the current folder:
 44.     if filename.upper() == 'LIST':
 45.         print('Maze files found in', os.getcwd())
 46.         for fileInCurrentFolder in os.listdir():
 47.             if (fileInCurrentFolder.startswith('maze') and
 48.             fileInCurrentFolder.endswith('.txt')):
 49.                 print('  ', fileInCurrentFolder)
 50.         continue
 51. 
 52.     if filename.upper() == 'QUIT':
 53.         sys.exit()
 54. 
 55.     if os.path.exists(filename):
 56.         break
 57.     print('There is no file named', filename)
 58. 
 59. # Load the maze from a file:
 60. mazeFile = open(filename)
 61. maze = {}
 62. lines = mazeFile.readlines()
 63. playerx = None
 64. playery = None
 65. exitx = None
 66. exity = None
 67. y = 0
 68. for line in lines:
 69.     WIDTH = len(line.rstrip())
 70.     for x, character in enumerate(line.rstrip()):
 71.         assert character in (WALL, EMPTY, START, EXIT), 'Invalid character at column {}, line {}'.format(x + 1, y + 1)
 72.         if character in (WALL, EMPTY):
 73.             maze[(x, y)] = character
 74.         elif character == START:
 75.             playerx, playery = x, y
 76.             maze[(x, y)] = EMPTY
 77.         elif character == EXIT:
 78.             exitx, exity = x, y
 79.             maze[(x, y)] = EMPTY
 80.     y += 1
 81. HEIGHT = y
 82. 
 83. assert playerx != None and playery != None, 'No start in maze file.'
 84. assert exitx != None and exity != None, 'No exit in maze file.'
 85. 
 86. while True:  # Main game loop.
 87.     displayMaze(maze)
 88. 
 89.     while True:  # Get user move.
 90.         print('                           W')
 91.         print('Enter direction, or QUIT: ASD')
 92.         move = input('> ').upper()
 93. 
 94.         if move == 'QUIT':
 95.             print('Thanks for playing!')
 96.             sys.exit()
 97. 
 98.         if move not in ['W', 'A', 'S', 'D']:
 99.             print('Invalid direction. Enter one of W, A, S, or D.')
100.             continue
101. 
102.         # Check if the player can move in that direction:
103.         if move == 'W' and maze[(playerx, playery - 1)] == EMPTY:
104.             break
105.         elif move == 'S' and maze[(playerx, playery + 1)] == EMPTY:
106.             break
107.         elif move == 'A' and maze[(playerx - 1, playery)] == EMPTY:
108.             break
109.         elif move == 'D' and maze[(playerx + 1, playery)] == EMPTY:
110.             break
111. 
112.         print('You cannot move in that direction.')
113. 
114.     # Keep moving in this direction until you encounter a branch point.
115.     if move == 'W':
116.         while True:
117.             playery -= 1
118.             if (playerx, playery) == (exitx, exity):
119.                 break
120.             if maze[(playerx, playery - 1)] == WALL:
121.                 break  # Break if we've hit a wall.
122.             if (maze[(playerx - 1, playery)] == EMPTY
123.                 or maze[(playerx + 1, playery)] == EMPTY):
124.                 break  # Break if we've reached a branch point.
125.     elif move == 'S':
126.         while True:
127.             playery += 1
128.             if (playerx, playery) == (exitx, exity):
129.                 break
130.             if maze[(playerx, playery + 1)] == WALL:
131.                 break  # Break if we've hit a wall.
132.             if (maze[(playerx - 1, playery)] == EMPTY
133.                 or maze[(playerx + 1, playery)] == EMPTY):
134.                 break  # Break if we've reached a branch point.
135.     elif move == 'A':
136.         while True:
137.             playerx -= 1
138.             if (playerx, playery) == (exitx, exity):
139.                 break
140.             if maze[(playerx - 1, playery)] == WALL:
141.                 break  # Break if we've hit a wall.
142.             if (maze[(playerx, playery - 1)] == EMPTY
143.                 or maze[(playerx, playery + 1)] == EMPTY):
144.                 break  # Break if we've reached a branch point.
145.     elif move == 'D':
146.         while True:
147.             playerx += 1
148.             if (playerx, playery) == (exitx, exity):
149.                 break
150.             if maze[(playerx + 1, playery)] == WALL:
151.                 break  # Break if we've hit a wall.
152.             if (maze[(playerx, playery - 1)] == EMPTY
153.                 or maze[(playerx, playery + 1)] == EMPTY):
154.                 break  # Break if we've reached a branch point.
155. 
156.     if (playerx, playery) == (exitx, exity):
157.         displayMaze(maze)
158.         print('You have reached the exit! Good job!')
159.         print('Thanks for playing!')
160.         sys.exit()