source: nagslang/level.py@ 164:06c681ff53aa

Last change on this file since 164:06c681ff53aa was 164:06c681ff53aa, checked in by Neil Muller <drnlmuller@…>, 7 years ago

Round-tripping through load/save shouldn't discard objects

File size: 6.2 KB
Line 
1import pygame
2import pygame.locals as pgl
3
4from nagslang import game_object as go
5from nagslang.resources import resources
6from nagslang.yamlish import load, dump
7
8POLY_COLORS = {
9 1: pygame.color.THECOLORS['red'],
10 2: pygame.color.THECOLORS['green'],
11 3: pygame.color.THECOLORS['yellow'],
12 4: pygame.color.THECOLORS['blue'],
13 5: pygame.color.THECOLORS['lightblue'],
14 6: pygame.color.THECOLORS['magenta'],
15}
16
17
18class Level(object):
19
20 def __init__(self, name):
21 self.name = name
22 # defaults
23 self.x = 800
24 self.y = 600
25 self.polygons = {}
26 self.basetile = 'tiles/floor.png'
27 self._tile_image = None
28 self._surface = None
29 self._exterior = False
30 self._glue = go.PuzzleGlue()
31 self._drawables = []
32 self._game_objects = []
33
34 def _get_data(self):
35 # For overriding in tests.
36 with resources.get_file('levels', self.name) as f:
37 return load(f)
38
39 def _dump_data(self, f):
40 # For manipulation in tests.
41 dump({
42 'size': [self.x, self.y],
43 'base_tile': self.basetile,
44 'polygons': self.polygons,
45 'game_objects': self._game_objects,
46 }, f)
47
48 def load(self, space):
49 data = self._get_data()
50 self.x, self.y = data['size']
51 self.base_tile = data['base_tile']
52 for i, points in data['polygons'].iteritems():
53 self.polygons[i] = []
54 for point in points:
55 self.polygons[i].append(tuple(point))
56 self._game_objects = data.get('game_objects', [])
57 for game_object_dict in self._game_objects:
58 self._create_game_object(space, **game_object_dict)
59
60 def _create_game_object(self, space, classname, args, name=None):
61 # We should probably build a registry of game objects or something.
62 # At least this is better than just calling `eval`, right?
63 cls = getattr(go, classname)
64 if issubclass(cls, go.Puzzler):
65 gobj = cls(*args)
66 elif issubclass(cls, go.GameObject):
67 gobj = cls(space, *args)
68 self._drawables.append(gobj)
69 else:
70 raise TypeError(
71 "Expected a subclass of Puzzler or GameObject, got %s" % (
72 classname))
73 if name is not None:
74 self._glue.add_component(name, gobj)
75
76 def all_closed(self):
77 """Check if all the polygons are closed"""
78 closed = True
79 messages = []
80 for index, poly in self.polygons.items():
81 if len(poly) == 0:
82 # We ignore empty polygons
83 continue
84 elif len(poly) == 1:
85 closed = False
86 messages.append("Error: polygon %s too small" % index)
87 elif poly[-1] != poly[0]:
88 closed = False
89 messages.append("Error: polygon %s not closed" % index)
90 return closed, messages
91
92 def save(self):
93 closed, _ = self.all_closed()
94 if not closed:
95 return False
96 with resources.get_file('levels', self.name, mode='w') as f:
97 self._dump_data(f)
98 return True
99
100 def get_size(self):
101 return self.x, self.y
102
103 def set_base_tile(self, new_tile):
104 self.basetile = new_tile
105 self._tile_image = None
106
107 def point_to_pygame(self, pos):
108 # Convert a point from pymunk (which is what we store)
109 # to pygame for drawing
110 return (pos[0], self.y - pos[1])
111
112 def get_walls(self):
113 return self.polygons.values()
114
115 def get_drawables(self):
116 return self._drawables
117
118 def _draw_walls(self):
119 for index, polygon in self.polygons.items():
120 color = POLY_COLORS[index]
121 if len(polygon) > 1:
122 pointlist = [self.point_to_pygame(p) for p in polygon]
123 pygame.draw.lines(self._surface, color, False, pointlist, 2)
124
125 def get_background(self):
126 self._draw_background()
127 self._draw_exterior()
128 # Draw polygons
129 self._draw_walls()
130 return self._surface
131
132 def _draw_exterior(self, force=False):
133 """Fill the exterior of the level with black"""
134 if self._exterior and not force:
135 return
136 white = pygame.color.THECOLORS['white']
137 black = pygame.color.THECOLORS['black']
138 surface = pygame.surface.Surface((self.x, self.y), pgl.SRCALPHA)
139 surface.fill(black)
140 for index, polygon in self.polygons.items():
141 if len(polygon) > 1:
142 pointlist = [self.point_to_pygame(p) for p in polygon]
143 # filled polygons
144 color = white
145 # If a polygon overlaps on of the existing polygons,
146 # it is treated as negative
147 # This is not a complete inversion, since any overlap
148 # triggers this (inversion is easy enough, but the
149 # behaviour doesn't seem useful)
150 # We also only check the vertexes - not breaking this
151 # assumption is left to the level designers
152 surface.lock()
153 for p in pointlist:
154 if surface.get_at(p) == white:
155 color = black
156 surface.unlock()
157 pygame.draw.polygon(surface, color, pointlist, 0)
158 self._surface.blit(surface, (0, 0), special_flags=pgl.BLEND_RGBA_MULT)
159 self._exterior = True
160
161 def _draw_background(self, force=False):
162 if self._tile_image is None:
163 self._tile_image = resources.get_image(self.basetile)
164 if self._surface is not None and not force:
165 # We assume we don't change
166 return self._surface
167 self._surface = pygame.surface.Surface((self.x, self.y), pgl.SRCALPHA)
168 self._surface.fill(pygame.color.THECOLORS['black'])
169 x_step = self._tile_image.get_rect().width
170 y_step = self._tile_image.get_rect().height
171 x_count = self.x // x_step + 1
172 y_count = self.y / y_step + 1
173 for x in range(x_count):
174 for y in range(y_count):
175 tile_rect = pygame.rect.Rect(x * x_step, y * y_step,
176 x_step, y_step)
177 self._surface.blit(self._tile_image, tile_rect)
178 return self._surface
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