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comparison gamelib/tiles.py @ 379:a8a7ada27fa2

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Multilayer sprite ordering. Only used by cursors so far.
author Jeremy Thurgood <firxen@gmail.com>
date Sat, 24 Oct 2009 21:43:15 +0000
parents e12d99215b74
children 7a58dadfd251
comparison
equal deleted inserted replaced
378:71f5897ac5ef 379:a8a7ada27fa2
40 yield n 40 yield n
41 41
42 TILE_MAP = TileMap() 42 TILE_MAP = TileMap()
43 REVERSE_TILE_MAP = TILE_MAP._reverse_map 43 REVERSE_TILE_MAP = TILE_MAP._reverse_map
44 44
45 class FarmSprites(list): 45
46 def __init__(self): 46 class LayeredSprites(object):
47 list.__init__(self) 47 # This is as small a subset of list behaviour as we can get away with.
48 # WARNING: It makes assumptions that may not be justified in the general case.
49 # Caveat utilitor and all the rest.
50
51 def __init__(self, layers=None, default_layer=None):
52 # Layers are ordered from bottom to top.
53 if layers is None:
54 layers = ['default']
55 self.layers = layers
56 if default_layer is None:
57 default_layer = layers[0]
58 self.default_layer = default_layer
59 self._sprites = {}
60 for layer in layers:
61 self._sprites[layer] = []
48 self.removed = [] 62 self.removed = []
49 self._cursor = None
50 63
51 def append(self, sprite): 64 def append(self, sprite, layer=None):
52 if self._cursor is not None: 65 if layer is None:
53 assert(self._cursor is self[-1]) 66 layer = self.default_layer
54 list.insert(self, -1, sprite) 67 self._sprites[layer].append(sprite)
55 else:
56 list.append(self, sprite)
57 sprite.updated = 1 68 sprite.updated = 1
58 69
59 def remove(self, sprite): 70 def remove(self, sprite, layer=None):
60 list.remove(self, sprite) 71 if layer is None:
72 layer = self.default_layer
73 self._sprites[layer].remove(sprite)
61 sprite.updated = 1 74 sprite.updated = 1
62 self.removed.append(sprite) 75 self.removed.append(sprite)
63 76
64 def set_cursor(self, cursor): 77 def __getitem__(self, key):
65 if self._cursor is not None: 78 # vid.py uses sprites[:] to get a mutation-safe list copy, so we need this.
66 self.remove(self._cursor) 79 # No other indexing or slicing operations make sense.
67 self._cursor = cursor 80 if not isinstance(key, slice):
68 if cursor is not None: 81 raise IndexError('[:] is the only supported slice/index operation.')
69 list.append(self, cursor) 82 return iter(self)
83
84 def __iter__(self):
85 # We iterate over all sprites in layer order.
86 for layer in self.layers:
87 for sprite in self._sprites[layer]:
88 yield sprite
70 89
71 90
72 class FarmVid(tilevid.Tilevid): 91 class FarmVid(tilevid.Tilevid):
73 """Extension of pgu's TileVid class to handle the complications 92 """Extension of pgu's TileVid class to handle the complications
74 of raising chickens. 93 of raising chickens.
75 """ 94 """
76 def __init__(self): 95 def __init__(self):
77 tilevid.Tilevid.__init__(self) 96 tilevid.Tilevid.__init__(self)
78 self.sprites = FarmSprites() 97 self.sprites = LayeredSprites(['animals', 'buildings', 'animations', 'cursor'], 'animals')
79 98
80 def png_folder_load_tiles(self, path): 99 def png_folder_load_tiles(self, path):
81 """Load tiles from a folder of PNG files.""" 100 """Load tiles from a folder of PNG files."""
82 full_path = data.filepath(path) 101 full_path = data.filepath(path)
83 for dirpath, dirnames, filenames in os.walk(full_path): 102 for dirpath, dirnames, filenames in os.walk(full_path):