annotate gamelib/state.py @ 72:d2250cf40ee7

Fix typo.
author Simon Cross <hodgestar+bzr@gmail.com>
date Mon, 23 Aug 2010 21:08:15 +0200
parents 99c5506de7ea
children 932b0956e77a
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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 albow.utils import frame_rect
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5 from pygame.locals import BLEND_ADD
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6 from pygame.rect import Rect
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7 from pygame.color import Color
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8
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9 import constants
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10
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11
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12 def initial_state():
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13 """Load the initial state."""
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14 state = State()
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15 state.load_scenes("cryo")
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16 state.load_scenes("bridge")
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17 #state.load_scenes("mess")
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18 #state.load_scenes("engine")
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19 #state.load_scenes("machine")
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20 #state.load_scenes("map")
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21 state.set_current_scene("cryo")
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22 return state
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25 class State(object):
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26 """Complete game state.
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27
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28 Game state consists of:
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29
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30 * items
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31 * scenes
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32 """
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33
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34 def __init__(self):
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35 # map of scene name -> Scene object
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36 self.scenes = {}
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37 # map of item name -> Item object
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38 self.items = {}
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39 # list of item objects in inventory
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40 self.inventory = []
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41 # Result of the most recent action
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42 self.msg = None
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43 self.description = None
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44 # current scene
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45 self.current_scene = None
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46
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47 def add_scene(self, scene):
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48 self.scenes[scene.name] = scene
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49
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50 def add_item(self, item):
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51 self.items[item.name] = item
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52
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53 def load_scenes(self, modname):
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54 mod = __import__("gamelib.scenes.%s" % (modname,), fromlist=[modname])
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55 for scene_cls in mod.SCENES:
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56 self.add_scene(scene_cls(self))
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57
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58 def set_current_scene(self, name):
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59 self.current_scene = self.scenes[name]
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61 def add_inventory_item(self, name):
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62 self.inventory.append(self.items[name])
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64 def remove_inventory_item(self, name):
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65 self.inventory.remove(self.items[name])
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66
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67 def draw(self, surface):
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68 self.current_scene.draw(surface)
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70 def interact(self, item, pos):
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71 self.current_scene.interact(item, pos)
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72
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73 def mouse_move(self, item, pos):
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74 self.current_scene.mouse_move(item, pos)
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75
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76 def get_message(self):
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77 return self.msg
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78
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79 def clear_message(self):
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80 self.msg = None
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81
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82 # FIXME: sort out how state.interact and description updating should work
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83
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84 def check_for_new_description(self, pos):
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85 """Check if the current mouse position causes a new description"""
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86 old_desc = self.description
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87 self.description = self.current_scene.check_description(pos)
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88 return old_desc != self.description
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89
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90 def get_description(self):
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91 #
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92 # DEPRECATED
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93 #
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94 return self.description
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95
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96 def message(self, msg):
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97 self.msg = msg
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98
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99
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100 class StatefulGizmo(object):
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101
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102 # initial data (optional, defaults to none)
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103 INITIAL_DATA = None
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104
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105 def __init__(self):
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106 self.data = {}
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107 if self.INITIAL_DATA:
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108 self.data.update(self.INITIAL_DATA)
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109
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110 def set_data(self, key, value):
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111 self.data[key] = value
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112
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113 def get_data(self, key):
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114 return self.data.get(key, None)
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115
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116
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117 class Scene(StatefulGizmo):
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118 """Base class for scenes."""
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119
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120 # sub-folder to look for resources in
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121 FOLDER = None
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122
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123 # name of background image resource
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124 BACKGROUND = None
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125
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126 # name of scene (optional, defaults to folder)
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127 NAME = None
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128
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129 def __init__(self, state):
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130 StatefulGizmo.__init__(self)
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131 # scene name
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132 self.name = self.NAME if self.NAME is not None else self.FOLDER
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133 # link back to state object
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134 self.state = state
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135 # map of thing names -> Thing objects
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136 self.things = {}
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137 self._background = get_image(self.FOLDER, self.BACKGROUND)
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138 self._current_thing = None
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139
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140 def add_item(self, item):
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141 self.state.add_item(item)
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142
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143 def add_thing(self, thing):
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144 self.things[thing.name] = thing
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145 thing.set_scene(self)
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146
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147 def remove_thing(self, thing):
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148 del self.things[thing.name]
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149
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150 def draw_background(self, surface):
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151 surface.blit(self._background, (0, 0), None, BLEND_ADD)
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152
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153 def draw_things(self, surface):
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154 for thing in self.things.itervalues():
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155 thing.draw(surface)
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156
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157 def draw(self, surface):
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158 self.draw_background(surface)
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159 self.draw_things(surface)
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160
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161 def interact(self, item, pos):
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162 """Interact with a particular position.
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163
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164 Item may be an item in the list of items or None for the hand.
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165 """
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166 for thing in self.things.itervalues():
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167 if thing.rect.collidepoint(pos):
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168 thing.interact(item)
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169 break
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170
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171 def mouse_move(self, item, pos):
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172 """Call to check whether the cursor has entered / exited a thing.
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173
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174 Item may be an item in the list of items or None for the hand.
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175 """
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176 if self._current_thing is not None:
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177 if self._current_thing.rect.collidepoint(pos):
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178 return
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179 else:
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180 self._current_thing.leave()
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181 self._current_thing = None
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182 for thing in self.things.itervalues():
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183 if thing.rect.collidepoint(pos):
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184 thing.enter(item)
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185 self._current_thing = thing
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186 break
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187
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188 def check_description(self, pos):
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189 #
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190 # DEPRECATED
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191 #
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192 desc = None
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193 for thing in self.things.itervalues():
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194 # Last thing in the list that matches wins
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195 if Rect(thing.rect).collidepoint(pos):
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196 desc = thing.get_description()
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197 return desc
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198
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199
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200 class Thing(StatefulGizmo):
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201 """Base class for things in a scene that you can interact with."""
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202
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203 # sub-folder to look for resources in
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204 FOLDER = None
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205
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206 # name of image resource
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207 IMAGE = None
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208
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209 # Interact rectangle hi-light color (for debugging)
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210 # (set to None to turn off)
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211 if constants.DEBUG:
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212 _interact_hilight_color = Color('Red')
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213 else:
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214 _interact_hilight_color = None
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215
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216 def __init__(self, name, rect):
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217 StatefulGizmo.__init__(self)
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218 self.name = name
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219 # area within scene to render to
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220 self.rect = Rect(rect)
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221 # area within scene that triggers calls to interact
68
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222 self.interact_rect = Rect(rect)
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223 # these are set by set_scene
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224 self.scene = None
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225 self.state = None
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226 # TODO: add masks
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227 # TODO: add images
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228
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229 def set_scene(self, scene):
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230 assert self.scene is None
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231 self.scene = scene
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232 self.state = scene.state
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233
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234 def message(self, msg):
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235 self.state.message(msg)
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236
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237 def get_description(self):
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238 return None
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239
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240 def is_interactive(self):
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241 return True
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242
71
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243 def enter(self, item):
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244 """Called when the cursor enters the Thing."""
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245 print "Enter %r -> %r" % (item, self)
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246
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247 def leave(self):
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248 """Called when the cursr leaves the Thing."""
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249 print "Leaves %r" % self
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250
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251 def interact(self, item):
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252 if not self.is_interactive():
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253 return
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254 if item is None:
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255 self.interact_without()
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256 else:
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257 handler = getattr(self, 'interact_with_' + item.name, None)
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258 if handler is not None:
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259 handler(item)
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260 else:
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261 self.interact_default(item)
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262
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263 def interact_without(self):
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264 self.interact_default(None)
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265
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266 def interact_default(self, item):
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267 self.message("It doesn't work.")
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268
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269 def draw(self, surface):
68
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270 if self._interact_hilight_color is not None:
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271 frame_rect(surface, self._interact_hilight_color,
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272 self.interact_rect.inflate(1, 1), 1)
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273 # TODO: draw image if there is one
23
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274
22
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275
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276 class Item(object):
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277 """Base class for inventory items."""
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278
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ebc76bc0c067 First item!
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279 # image for inventory
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280 INVENTORY_IMAGE = None
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281
35
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282 def __init__(self, name):
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283 self.name = name
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284 self.inventory_image = get_image('items', self.INVENTORY_IMAGE)
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285 # TODO: needs cursor
22
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diff changeset
286
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e5c043aeed65 Inventory and items. And stuff.
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287 def get_inventory_image(self):
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288 return self.inventory_image
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289