Mercurial > nagslang

annotate nagslang/level.py @ 425:1a85044f81a8

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Safer color access
author Neil Muller <drnlmuller@gmail.com>
date Sat, 07 Sep 2013 13:34:01 +0200
parents d04981e24fda
children fef028d65451
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rev   line source
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1 import os
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2
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3 import pygame
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4 import pygame.locals as pgl
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5
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6 from nagslang import collectable
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7 from nagslang import game_object as go
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8 from nagslang import enemies
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9 from nagslang import puzzle
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10 from nagslang.utils import tile_surface
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11 from nagslang.resources import resources
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12 from nagslang.yamlish import load, dump
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13
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14 POLY_COLORS = {
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15 1: pygame.color.THECOLORS['red'],
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16 2: pygame.color.THECOLORS['green'],
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17 3: pygame.color.THECOLORS['yellow'],
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18 4: pygame.color.THECOLORS['blue'],
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19 5: pygame.color.THECOLORS['lightblue'],
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20 6: pygame.color.THECOLORS['magenta'],
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21 7: pygame.color.THECOLORS['lightgreen'],
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22 8: pygame.color.THECOLORS['grey'],
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23 }
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25
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26 LINE_COLOR = pygame.color.THECOLORS['orange']
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27
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28
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29 class Level(object):
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30
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31 def __init__(self, name, world):
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32 self.name = name
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33 # defaults
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34 self.x = 800
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35 self.y = 600
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36 self.polygons = {}
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37 self.lines = []
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38 self.world = world
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39 self.world.level_state.setdefault(name, {})
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40 self.basetile = 'tiles/floor.png'
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41 self._tile_image = None
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42 self._surface = None
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43 self._exterior = False
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44 self._glue = puzzle.PuzzleGlue()
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45 self.drawables = []
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46 self.overlay_drawables = []
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47 self._game_objects = []
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48 self._enemies = []
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49
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50 def _get_data(self):
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51 # For overriding in tests.
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52 with resources.get_file('levels', self.name) as f:
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53 return load(f)
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54
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55 def _dump_data(self, f):
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56 # For manipulation in tests.
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57 dump({
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58 'size': [self.x, self.y],
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59 'base_tile': self.basetile,
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60 'polygons': self.polygons,
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61 'lines': self.lines,
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62 'game_objects': self._game_objects,
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63 'enemies': self._enemies,
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64 }, f)
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65
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66 @classmethod
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67 def list_levels(cls):
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68 dir_ = resources.get_resource_path('levels')
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69 for file_ in os.listdir(dir_):
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70 if file_ == 'meta':
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71 continue
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72 yield file_
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73
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74 @classmethod
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75 def game_starting_point(cls):
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76 with resources.get_file('levels', 'meta') as f:
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77 data = load(f)
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78 return (data['starting_level'], data['starting_position'])
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79
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80 def load(self, space):
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81 data = self._get_data()
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82 self.x, self.y = data['size']
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83 self.basetile = data['base_tile']
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84 for i, points in data['polygons'].iteritems():
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85 self.polygons[i] = []
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86 for point in points:
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87 self.polygons[i].append(tuple(point))
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88 self.lines = data.get('lines', [])
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89 self._game_objects = data.get('game_objects', [])
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90 for game_object_dict in self._game_objects:
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91 self._create_game_object(space, **game_object_dict)
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92 self._enemies = data.get('enemies', [])
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93 for enemy_dict in self._enemies:
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94 self._create_enemy(space, **enemy_dict)
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95
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96 def _create_game_object(self, space, classname, args, name=None):
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97 modules = {
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98 'collectable': collectable,
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99 'game_object': go,
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100 'puzzle': puzzle,
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101 }
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102 if '.' in classname:
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103 module, classname = classname.split('.')
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104 else:
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105 module = 'game_object'
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106 cls = getattr(modules[module], classname)
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107
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108 if module == 'collectable' and name in self.world.inventory:
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109 return
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110
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111 if issubclass(cls, puzzle.Puzzler):
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112 gobj = cls(*args)
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113 elif issubclass(cls, go.GameObject):
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114 gobj = cls(space, *args)
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115 level_state = self.world.level_state[self.name]
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116 stored_state = level_state.get(name, {})
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117 should_save = bool(gobj.set_stored_state_dict(stored_state))
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118 if should_save:
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119 if name is None:
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120 raise Exception(
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121 "Unnamed game object wants to save state:" % (gobj,))
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122 level_state[name] = stored_state
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123 self.drawables.append(gobj)
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124 if gobj.overlay:
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125 self.overlay_drawables.append(gobj.overlay)
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126 else:
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127 raise TypeError(
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128 "Expected a subclass of Puzzler or GameObject, got %s" % (
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129 classname))
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130 if name is not None:
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131 self._glue.add_component(name, gobj)
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132 return gobj
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133
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134 def _create_enemy(self, space, classname, args, name=None):
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135 cls = getattr(enemies, classname)
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136 if issubclass(cls, go.GameObject):
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137 gobj = cls(space, self.world, *args)
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138 self.drawables.append(gobj)
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139 else:
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140 raise TypeError(
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141 "Expected a subclass of GameObject, got %s" % (
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142 classname))
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143 if name is not None:
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144 self._glue.add_component(name, gobj)
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145 return gobj
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146
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147 def all_closed(self):
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148 """Check if all the polygons are closed"""
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149 closed = True
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150 messages = []
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151 for index, poly in self.polygons.items():
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152 if len(poly) == 0:
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153 # We ignore empty polygons
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154 continue
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155 elif len(poly) == 1:
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156 closed = False
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157 messages.append("Error: polygon %s too small" % index)
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158 elif poly[-1] != poly[0]:
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159 closed = False
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160 messages.append("Error: polygon %s not closed" % index)
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161 return closed, messages
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162
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163 def save(self):
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164 closed, _ = self.all_closed()
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165 if not closed:
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166 return False
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167 with resources.get_file('levels', self.name, mode='w') as f:
164
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168 self._dump_data(f)
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169 return True
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170
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171 def get_size(self):
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172 return self.x, self.y
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173
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174 def set_base_tile(self, new_tile):
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175 self.basetile = new_tile
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176 self._tile_image = None
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177
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178 def point_to_pygame(self, pos):
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179 # Convert a point from pymunk (which is what we store)
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180 # to pygame for drawing
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181 return (pos[0], self.y - pos[1])
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182
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183 def get_walls(self):
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184 walls = self.polygons.values()
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185 walls.extend(self.lines)
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186 return walls
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187
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188 def _draw_walls(self):
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189 for index, polygon in self.polygons.items():
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190 color = POLY_COLORS.get(index, pygame.color.THECOLORS['black'])
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191 if len(polygon) > 1:
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192 pointlist = [self.point_to_pygame(p) for p in polygon]
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193 pygame.draw.lines(self._surface, color, False, pointlist, 2)
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194 for line in self.lines:
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195 pointlist = [self.point_to_pygame(p) for p in line]
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196 pygame.draw.lines(self._surface, LINE_COLOR, False, pointlist, 2)
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197
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198 def get_background(self):
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199 self._draw_background()
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200 self._draw_exterior()
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201 # Draw polygons
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202 self._draw_walls()
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203 return self._surface
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204
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205 def _draw_exterior(self, force=False):
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206 """Fill the exterior of the level with black"""
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207 if self._exterior and not force:
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208 return
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209 white = pygame.color.THECOLORS['white']
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210 black = pygame.color.THECOLORS['black']
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211 surface = pygame.surface.Surface((self.x, self.y), pgl.SRCALPHA)
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212 surface.fill(black)
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213 for index, polygon in self.polygons.items():
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214 if len(polygon) > 1:
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215 pointlist = [self.point_to_pygame(p) for p in polygon]
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216 # filled polygons
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217 color = white
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218 # If a polygon overlaps on of the existing polygons,
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219 # it is treated as negative
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220 # This is not a complete inversion, since any overlap
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221 # triggers this (inversion is easy enough, but the
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222 # behaviour doesn't seem useful)
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223 # We also only check the vertexes - not breaking this
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224 # assumption is left to the level designers
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225 surface.lock()
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226 for p in pointlist:
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227 if surface.get_at(p) == white:
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228 color = black
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229 surface.unlock()
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230 pygame.draw.polygon(surface, color, pointlist, 0)
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231 self._surface.blit(surface, (0, 0), special_flags=pgl.BLEND_RGBA_MULT)
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232 self._exterior = True
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233
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234 def _draw_background(self, force=False):
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235 if self._tile_image is None:
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236 self._tile_image = resources.get_image(self.basetile)
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237 if self._surface is not None and not force:
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238 # We assume we don't change
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239 return self._surface
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240 self._surface = tile_surface((self.x, self.y), self._tile_image)
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241 return self._surface