koperkapel/loaders/levelloader.py

   1 """Loader a level, using the pygame-zero ResourceLoader infrastructure"""
   2
   3 import os
   4 import json
   5
   6 from pgzero.loaders import images, ResourceLoader
   7 import os
   8 import random
   9 from pygame.transform import rotate
  10
  11 class Tile:
  12     IMG = None
  13     TILESET = None
  14
  15     @classmethod
  16     def image(cls, neighbors):
  17         if cls.IMG is None or cls.TILESET is None:
  18             raise NotImplementedError()
  19         return images.load(os.path.join(cls.TILESET, cls.IMG))
  20
  21 class OrientatedTile(Tile):
  22     ANGLE = None
  23
  24     @classmethod
  25     def image(cls, neighbors):
  26         if cls.IMG is None or cls.TILESET is None:
  27             raise NotImplementedError()
  28         img = images.load(os.path.join(cls.TILESET, cls.IMG))
  29         if cls.ANGLE:
  30             img = rotate(img, cls.ANGLE)
  31         return img
  32
  33
  34 class RandomizedTile(Tile):
  35     IMGDIR = None
  36     TILESET = None
  37     ROTATE = True
  38
  39     @classmethod
  40     def image(cls, neighbors):
  41         if cls.IMGDIR is None or cls.TILESET is None:
  42             raise NotImplementedError()
  43
  44         imgdir = os.path.join(os.path.dirname(__file__), '..', 'images',
  45                 cls.TILESET, cls.IMGDIR)
  46         imgpath = os.path.splitext(random.choice(os.listdir(imgdir)))[0]
  47         img = images.load(os.path.join(cls.TILESET, cls.IMGDIR, imgpath))
  48
  49         if cls.ROTATE:
  50             img = rotate(img, 90 * random.randint(0, 3))
  51
  52         return img
  53
  54 class Floor(RandomizedTile):
  55     IMGDIR = "floor"
  56
  57 class Wall(RandomizedTile):
  58     IMGDIR = "wall"
  59
  60 class Underground(RandomizedTile):
  61     IMGDIR = "underground"
  62
  63 class Tunnel(OrientatedTile):
  64
  65     @classmethod
  66     def image(cls, neighbors):
  67         connections = [True if 'walk' in x['behaviour'] else False for x in neighbors]
  68         conn_count = connections.count(True)
  69         # simple cases
  70         cls.ANGLE = 0
  71         if conn_count == 0:
  72             # return single point tunnel
  73             cls.IMG = os.path.join('tunnel', 'tunnel_none')
  74         elif conn_count == 4:
  75             # crossroads
  76             cls.IMG = os.path.join('tunnel', 'tunnel_crossroads')
  77         elif conn_count == 1:
  78             # 1 point connector, roatated correctly
  79             cls.IMG = os.path.join('tunnel', 'tunnel_1way')
  80             # because of the ordering of neighbors, we use this formulation
  81             for x, angle in zip(connections, (90, 270, 0, 180)):
  82                 if x:
  83                     cls.ANGLE = angle
  84                     break
  85         elif conn_count == 3:
  86             # 3 point connector, rotated correctly
  87             cls.IMG = os.path.join('tunnel', 'tunnel_3way')
  88             # find the missing connection.
  89             for x, angle in zip(connections, (0, 180, 270, 90)):
  90                 if not x:
  91                     cls.ANGLE = angle
  92                     break
  93         elif conn_count == 2:
  94             # Need to distinguish pass-through or corner, and
  95             # rotate correctly
  96             # neighbors is left, right then up, down
  97             if connections[0] == connections[1]:
  98                 cls.IMG = os.path.join('tunnel', 'tunnel_passthrough')
  99                 if connections[0]:
 100                     cls.ANGLE = 90
 101             else:
 102                 cls.IMG = os.path.join('tunnel', 'tunnel_corner')
 103                 if connections[0]:
 104                     if connections[2]:
 105                         # left, up
 106                         cls.ANGLE = 90
 107                     else:
 108                         # left, down
 109                         cls.ANGLE = 180
 110                 else:
 111                     if connections[2]:
 112                         # right, up
 113                         cls.ANGLE = 0
 114                     else:
 115                         # right, down
 116                         cls.ANGLE = 270
 117
 118         return super(Tunnel, cls).image(neighbors)
 119
 120
 121 TILES = {
 122     "cwall": Wall, # rename this everywhere
 123     "floor": Floor,
 124     "tunnel": Tunnel,
 125     "underground": Underground,
 126 }
 127
 128 class LevelLoader(ResourceLoader):
 129     """ Level loader. """
 130
 131     EXTNS = ['json']
 132     TYPE = 'level'
 133
 134     def _load(self, level_path):
 135         f = open(level_path, 'r')
 136         level_data = json.load(f)
 137         f.close()
 138         self._height = len(level_data['tiles'])
 139         self._width = len(level_data['tiles'][0])
 140         self._tiles = level_data['tiles']
 141         self._tileset = level_data['tileset']
 142         # Consistency check, so we can assume things are correct
 143         # in the level renderer
 144         for row, row_data in enumerate(self._tiles):
 145             if len(row_data) != self._width:
 146                 raise RuntimeError("Incorrect len for row %d" % row)
 147         for tile in TILES.values():
 148             tile.TILESET = self._tileset
 149         self._load_tile_images()
 150         return level_data
 151
 152     def _load_tile_images(self):
 153         """Load all the tile images"""
 154         height = len(self._tiles)
 155         width = len(self._tiles[0])
 156         for y, row_data in enumerate(self._tiles):
 157             for x, tile in enumerate(row_data):
 158                 # simplist case
 159                 # 4 -connected neighbors
 160                 neighborhood = [self._tiles[y][x-1] if x > 0 else None,
 161                                 self._tiles[y][x+1] if x < width - 1 else None,
 162                                 self._tiles[y-1][x] if y > 0 else None,
 163                                 self._tiles[y+1][x] if y < height- 1 else None,
 164                                ]
 165                 for layer in ['floor', 'tunnels']:
 166                     neighbors = [x[layer] if x else None for x in neighborhood]
 167                     tile['%s image' % layer] = \
 168                             TILES[tile[layer]['base']].image(neighbors)
 169
 170
 171 levels = LevelLoader('levels')