Mercurial > pyntnclick
annotate gamelib/state.py @ 65:cab924519037
Move some description management from widget to state object
author | Neil Muller <neil@dip.sun.ac.za> |
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date | Mon, 23 Aug 2010 19:45:07 +0200 |
parents | 3087be3463e0 |
children | 158a13a48d48 |
rev | line source |
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7
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Start of base classes for game state.
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1 """Utilities and base classes for dealing with scenes.""" |
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2 |
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Start of scene drawing framework.
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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 self.description = None |
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40 # current scene |
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41 self.current_scene = None |
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42 |
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43 def add_scene(self, scene): |
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44 self.scenes[scene.name] = scene |
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45 |
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46 def add_item(self, item): |
35 | 47 self.items[item.name] = item |
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48 |
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49 def load_scenes(self, modname): |
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50 mod = __import__("gamelib.scenes.%s" % (modname,), fromlist=[modname]) |
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51 for scene_cls in mod.SCENES: |
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52 self.add_scene(scene_cls(self)) |
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53 |
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54 def set_current_scene(self, name): |
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55 self.current_scene = self.scenes[name] |
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56 |
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57 def add_inventory_item(self, name): |
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58 self.inventory.append(self.items[name]) |
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59 |
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60 def remove_inventory_item(self, name): |
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61 self.inventory.remove(self.items[name]) |
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62 |
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63 def draw(self, surface): |
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64 self.current_scene.draw(surface) |
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65 |
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66 def get_message(self): |
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67 return self.msg |
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68 |
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69 def clear_message(self): |
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70 self.msg = None |
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71 |
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72 # FIXME: sort out how state.interact and description updating should work |
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73 |
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74 def check_for_new_description(self, pos): |
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75 """Check if the current mouse position causes a new description""" |
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76 old_desc = self.description |
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77 self.description = self.current_scene.check_description(pos) |
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78 return old_desc != self.description |
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79 |
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80 def get_description(self): |
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81 return self.description |
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82 |
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83 def message(self, msg): |
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84 self.msg = msg |
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85 |
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86 |
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87 class StatefulGizmo(object): |
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88 |
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89 # initial data (optional, defaults to none) |
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90 INITIAL_DATA = None |
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91 |
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92 def __init__(self): |
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93 self.data = {} |
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94 if self.INITIAL_DATA: |
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95 self.data.update(self.INITIAL_DATA) |
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96 |
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97 def set_data(self, key, value): |
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98 self.data[key] = value |
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99 |
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100 def get_data(self, key): |
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101 return self.data.get(key, None) |
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102 |
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103 |
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104 class Scene(StatefulGizmo): |
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105 """Base class for scenes.""" |
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106 |
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107 # sub-folder to look for resources in |
22 | 108 FOLDER = None |
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109 |
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110 # name of background image resource |
22 | 111 BACKGROUND = None |
112 | |
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113 # name of scene (optional, defaults to folder) |
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114 NAME = None |
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115 |
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116 def __init__(self, state): |
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117 StatefulGizmo.__init__(self) |
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118 # scene name |
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119 self.name = self.NAME if self.NAME is not None else self.FOLDER |
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120 # link back to state object |
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121 self.state = state |
22 | 122 # map of thing names -> Thing objects |
123 self.things = {} | |
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124 self._background = get_image(self.FOLDER, self.BACKGROUND) |
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125 |
35 | 126 def add_item(self, item): |
127 self.state.add_item(item) | |
128 | |
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129 def add_thing(self, thing): |
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130 self.things[thing.name] = thing |
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131 thing.set_scene(self) |
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132 |
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133 def remove_thing(self, thing): |
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134 del self.things[thing.name] |
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135 |
22 | 136 def draw_background(self, surface): |
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137 surface.blit(self._background, (0, 0), None, BLEND_ADD) |
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138 |
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139 def draw_things(self, surface): |
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140 for thing in self.things.itervalues(): |
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141 thing.draw(surface) |
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142 |
22 | 143 def draw(self, surface): |
144 self.draw_background(surface) | |
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145 self.draw_things(surface) |
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146 |
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147 def check_description(self, pos): |
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148 desc = None |
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149 for thing in self.things.itervalues(): |
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150 # Last thing in the list that matches wins |
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151 if Rect(thing.rect).collidepoint(pos): |
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152 desc = thing.get_description() |
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153 return desc |
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154 |
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155 |
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156 class Thing(StatefulGizmo): |
22 | 157 """Base class for things in a scene that you can interact with.""" |
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158 |
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159 # sub-folder to look for resources in |
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160 FOLDER = None |
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161 |
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162 # name of image resource |
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163 IMAGE = None |
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164 |
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165 def __init__(self, name, rect): |
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166 StatefulGizmo.__init__(self) |
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167 self.name = name |
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168 # area within scene that triggers calls to interact |
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169 self.rect = rect |
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170 # these are set by set_scene |
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171 self.scene = None |
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172 self.state = None |
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173 # TODO: add masks |
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174 # TODO: add images |
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175 |
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176 def set_scene(self, scene): |
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177 assert self.scene is None |
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178 self.scene = scene |
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179 self.state = scene.state |
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180 |
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181 def message(self, msg): |
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182 self.state.message(msg) |
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183 |
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184 def get_description(self): |
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185 return None |
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186 |
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187 def is_interactive(self): |
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188 return True |
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189 |
22 | 190 def interact(self, item): |
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191 if not self.is_interactive(): |
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192 return |
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193 if item is None: |
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194 self.interact_without() |
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195 else: |
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196 handler = getattr(self, 'interact_with_' + item.name, None) |
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197 if handler is not None: |
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198 handler(item) |
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199 else: |
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200 self.interact_default(item) |
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201 |
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202 def interact_without(self): |
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203 self.interact_default(None) |
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204 |
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205 def interact_default(self, item): |
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206 self.message("It doesn't work.") |
22 | 207 |
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208 def draw(self, surface): |
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209 pass |
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210 |
22 | 211 |
212 class Item(object): | |
213 """Base class for inventory items.""" | |
214 | |
35 | 215 # image for inventory |
216 INVENTORY_IMAGE = None | |
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217 |
35 | 218 def __init__(self, name): |
219 self.name = name | |
220 self.inventory_image = get_image('items', self.INVENTORY_IMAGE) | |
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221 # TODO: needs cursor |
22 | 222 |
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223 def get_inventory_image(self): |
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224 return self.inventory_image |
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225 |