annotate gamelib/state.py @ 63:3087be3463e0

Some framework support for better message handling
author Neil Muller <neil@dip.sun.ac.za>
date Mon, 23 Aug 2010 18:32:15 +0200
parents 75bf3d3689e9
children cab924519037
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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
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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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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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26 * items
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27 * scenes
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28 """
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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):
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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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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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65 def get_message(self):
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66 return self.msg
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68 def clear_message(self):
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69 self.msg = None
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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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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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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
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100 FOLDER = None
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101
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102 # name of background image resource
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103 BACKGROUND = None
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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
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114 # map of thing names -> Thing objects
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115 self.things = {}
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116 self._background = get_image(self.FOLDER, self.BACKGROUND)
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117
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118 def add_item(self, item):
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119 self.state.add_item(item)
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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
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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
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135 def draw(self, surface):
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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):
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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
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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.")
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199
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200 def draw(self, surface):
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201 pass
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202
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203
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204 class Item(object):
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205 """Base class for inventory items."""
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206
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207 # image for inventory
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208 INVENTORY_IMAGE = None
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209
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210 def __init__(self, name):
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211 self.name = name
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212 self.inventory_image = get_image('items', self.INVENTORY_IMAGE)
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213 # TODO: needs cursor
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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