Mercurial > pyntnclick
annotate gamelib/state.py @ 63:3087be3463e0
Some framework support for better message handling
author | Neil Muller <neil@dip.sun.ac.za> |
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date | Mon, 23 Aug 2010 18:32:15 +0200 |
parents | 75bf3d3689e9 |
children | cab924519037 |
rev | line source |
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7
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1 """Utilities and base classes for dealing with scenes.""" |
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2 |
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3 from albow.resource import get_image, get_sound |
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4 from pygame.locals import BLEND_ADD |
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5 from pygame.rect import Rect |
11 | 6 |
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7 |
9
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8 def initial_state(): |
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9 """Load the initial state.""" |
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10 state = State() |
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11 state.load_scenes("cryo") |
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12 state.load_scenes("bridge") |
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13 #state.load_scenes("mess") |
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14 #state.load_scenes("engine") |
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15 #state.load_scenes("machine") |
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16 #state.load_scenes("map") |
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17 state.set_current_scene("cryo") |
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18 return state |
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19 |
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20 |
7
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21 class State(object): |
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22 """Complete game state. |
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23 |
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24 Game state consists of: |
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25 |
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26 * items |
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27 * scenes |
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28 """ |
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29 |
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30 def __init__(self): |
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31 # map of scene name -> Scene object |
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32 self.scenes = {} |
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33 # map of item name -> Item object |
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34 self.items = {} |
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35 # list of item objects in inventory |
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36 self.inventory = [] |
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37 # Result of the most recent action |
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38 self.msg = None |
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39 # current scene |
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40 self.current_scene = None |
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41 |
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42 def add_scene(self, scene): |
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43 self.scenes[scene.name] = scene |
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44 |
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45 def add_item(self, item): |
35 | 46 self.items[item.name] = item |
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47 |
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48 def load_scenes(self, modname): |
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49 mod = __import__("gamelib.scenes.%s" % (modname,), fromlist=[modname]) |
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50 for scene_cls in mod.SCENES: |
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51 self.add_scene(scene_cls(self)) |
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52 |
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53 def set_current_scene(self, name): |
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54 self.current_scene = self.scenes[name] |
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55 |
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56 def add_inventory_item(self, name): |
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57 self.inventory.append(self.items[name]) |
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58 |
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59 def remove_inventory_item(self, name): |
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60 self.inventory.remove(self.items[name]) |
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61 |
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62 def draw(self, surface): |
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63 self.current_scene.draw(surface) |
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64 |
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65 def get_message(self): |
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66 return self.msg |
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67 |
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68 def clear_message(self): |
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69 self.msg = None |
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70 |
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71 def get_description(self, pos): |
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72 """Get the description associated with current mouse position""" |
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73 return self.current_scene.get_description(pos) |
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74 |
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75 def message(self, msg): |
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76 self.msg = msg |
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77 |
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78 |
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79 class StatefulGizmo(object): |
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80 |
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81 # initial data (optional, defaults to none) |
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82 INITIAL_DATA = None |
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83 |
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84 def __init__(self): |
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85 self.data = {} |
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86 if self.INITIAL_DATA: |
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87 self.data.update(self.INITIAL_DATA) |
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88 |
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89 def set_data(self, key, value): |
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90 self.data[key] = value |
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91 |
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92 def get_data(self, key): |
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93 return self.data.get(key, None) |
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94 |
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95 |
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96 class Scene(StatefulGizmo): |
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97 """Base class for scenes.""" |
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98 |
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99 # sub-folder to look for resources in |
22 | 100 FOLDER = None |
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101 |
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102 # name of background image resource |
22 | 103 BACKGROUND = None |
104 | |
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105 # name of scene (optional, defaults to folder) |
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106 NAME = None |
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107 |
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108 def __init__(self, state): |
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109 StatefulGizmo.__init__(self) |
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110 # scene name |
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111 self.name = self.NAME if self.NAME is not None else self.FOLDER |
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112 # link back to state object |
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113 self.state = state |
22 | 114 # map of thing names -> Thing objects |
115 self.things = {} | |
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116 self._background = get_image(self.FOLDER, self.BACKGROUND) |
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117 |
35 | 118 def add_item(self, item): |
119 self.state.add_item(item) | |
120 | |
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121 def add_thing(self, thing): |
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122 self.things[thing.name] = thing |
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123 thing.set_scene(self) |
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124 |
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125 def remove_thing(self, thing): |
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126 del self.things[thing.name] |
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127 |
22 | 128 def draw_background(self, surface): |
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129 surface.blit(self._background, (0, 0), None, BLEND_ADD) |
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130 |
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131 def draw_things(self, surface): |
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132 for thing in self.things.itervalues(): |
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133 thing.draw(surface) |
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134 |
22 | 135 def draw(self, surface): |
136 self.draw_background(surface) | |
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137 self.draw_things(surface) |
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138 |
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139 def get_description(self, pos): |
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140 desc = None |
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141 for thing in self.things.itervalues(): |
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142 # Last thing in the list that matches wins |
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143 if Rect(thing.rect).collidepoint(pos): |
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144 desc = thing.get_description() |
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145 return desc |
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146 |
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147 |
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148 class Thing(StatefulGizmo): |
22 | 149 """Base class for things in a scene that you can interact with.""" |
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150 |
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151 # sub-folder to look for resources in |
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152 FOLDER = None |
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153 |
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154 # name of image resource |
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155 IMAGE = None |
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156 |
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157 def __init__(self, name, rect): |
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158 StatefulGizmo.__init__(self) |
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159 self.name = name |
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160 # area within scene that triggers calls to interact |
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161 self.rect = rect |
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162 # these are set by set_scene |
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163 self.scene = None |
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164 self.state = None |
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165 # TODO: add masks |
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166 # TODO: add images |
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167 |
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168 def set_scene(self, scene): |
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169 assert self.scene is None |
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170 self.scene = scene |
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171 self.state = scene.state |
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172 |
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173 def message(self, msg): |
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174 self.state.message(msg) |
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175 |
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176 def get_description(self): |
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177 return None |
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178 |
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179 def is_interactive(self): |
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180 return True |
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181 |
22 | 182 def interact(self, item): |
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183 if not self.is_interactive(): |
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184 return |
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185 if item is None: |
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186 self.interact_without() |
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187 else: |
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188 handler = getattr(self, 'interact_with_' + item.name, None) |
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189 if handler is not None: |
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190 handler(item) |
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191 else: |
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192 self.interact_default(item) |
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193 |
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194 def interact_without(self): |
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195 self.interact_default(None) |
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196 |
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197 def interact_default(self, item): |
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198 self.message("It doesn't work.") |
22 | 199 |
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200 def draw(self, surface): |
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201 pass |
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202 |
22 | 203 |
204 class Item(object): | |
205 """Base class for inventory items.""" | |
206 | |
35 | 207 # image for inventory |
208 INVENTORY_IMAGE = None | |
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209 |
35 | 210 def __init__(self, name): |
211 self.name = name | |
212 self.inventory_image = get_image('items', self.INVENTORY_IMAGE) | |
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213 # TODO: needs cursor |
22 | 214 |
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215 def get_inventory_image(self): |
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216 return self.inventory_image |
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217 |