annotate gamelib/state.py @ 77:bb7c8072f8c0

Some hacks to make Label work.
author Simon Cross <hodgestar+bzr@gmail.com>
date Mon, 23 Aug 2010 22:42:30 +0200
parents 1a5fdc225939
children 6bfebfbce42e
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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 albow.controls import Label
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6 from pygame.locals import BLEND_ADD
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7 from pygame.rect import Rect
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8 from pygame.color import Color
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9
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10 import constants
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13 def initial_state():
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14 """Load the initial state."""
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15 state = State()
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16 state.load_scenes("cryo")
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17 state.load_scenes("bridge")
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18 #state.load_scenes("mess")
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19 #state.load_scenes("engine")
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20 #state.load_scenes("machine")
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21 #state.load_scenes("map")
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22 state.set_current_scene("cryo")
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23 return state
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26 class State(object):
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27 """Complete game state.
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29 Game state consists of:
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31 * items
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32 * scenes
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33 """
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35 def __init__(self):
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36 # map of scene name -> Scene object
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37 self.scenes = {}
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38 # map of item name -> Item object
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39 self.items = {}
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40 # list of item objects in inventory
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41 self.inventory = []
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42 # currently selected tool (item)
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43 self.tool = 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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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 set_tool(self, item):
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68 self.tool = item
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69
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70 def draw(self, surface):
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71 self.current_scene.draw(surface)
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73 def interact(self, pos):
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74 self.current_scene.interact(self.tool, pos)
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76 def mouse_move(self, pos):
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77 self.current_scene.mouse_move(self.tool, pos)
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80 class StatefulGizmo(object):
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81
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82 # initial data (optional, defaults to none)
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83 INITIAL_DATA = None
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84
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85 def __init__(self):
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86 self.data = {}
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87 if self.INITIAL_DATA:
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88 self.data.update(self.INITIAL_DATA)
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89
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90 def set_data(self, key, value):
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91 self.data[key] = value
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92
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93 def get_data(self, key):
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94 return self.data.get(key, None)
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96
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97 class Scene(StatefulGizmo):
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98 """Base class for scenes."""
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99
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100 # sub-folder to look for resources in
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101 FOLDER = None
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102
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103 # name of background image resource
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104 BACKGROUND = None
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105
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106 # name of scene (optional, defaults to folder)
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107 NAME = None
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108
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109 def __init__(self, state):
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110 StatefulGizmo.__init__(self)
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111 # scene name
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112 self.name = self.NAME if self.NAME is not None else self.FOLDER
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113 # link back to state object
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114 self.state = state
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115 # map of thing names -> Thing objects
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116 self.things = {}
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117 self._background = get_image(self.FOLDER, self.BACKGROUND)
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118 self._current_thing = None
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119 self._current_description = None
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120
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121 def add_item(self, item):
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122 self.state.add_item(item)
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123
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124 def add_thing(self, thing):
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125 self.things[thing.name] = thing
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126 thing.set_scene(self)
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127
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128 def remove_thing(self, thing):
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129 del self.things[thing.name]
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130
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131 def _make_description(self, text):
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132 if text is None:
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133 return None
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134 label = Label(text)
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135 # TODO: create derived label class that does this
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136 # manually recalculate size
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137 d = 5
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138 w, h = label.size
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139 label.margin = d
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140 label.size = (w+2*d, h+2*d)
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141 label.border_width = 1
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142 label.border_color = (0, 0, 0)
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143 label.bg_color = (127, 127, 127)
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144 label.fg_color = (0, 0, 0)
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145 return label
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146
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147 def draw_description(self, surface):
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148 if self._current_description is not None:
77
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149 sub = surface.subsurface(
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150 Rect(5, 5, *self._current_description.size))
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151 self._current_description.draw_all(sub)
76
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152
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153 def draw_background(self, surface):
23
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154 surface.blit(self._background, (0, 0), None, BLEND_ADD)
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155
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156 def draw_things(self, surface):
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157 for thing in self.things.itervalues():
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158 thing.draw(surface)
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159
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160 def draw(self, surface):
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161 self.draw_background(surface)
23
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162 self.draw_things(surface)
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163 self.draw_description(surface)
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164
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165 def interact(self, item, pos):
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166 """Interact with a particular position.
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167
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168 Item may be an item in the list of items or None for the hand.
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169 """
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170 for thing in self.things.itervalues():
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171 if thing.rect.collidepoint(pos):
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172 thing.interact(item)
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173 break
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174
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175 def mouse_move(self, item, pos):
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176 """Call to check whether the cursor has entered / exited a thing.
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177
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178 Item may be an item in the list of items or None for the hand.
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179 """
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180 if self._current_thing is not None:
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181 if self._current_thing.rect.collidepoint(pos):
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182 return
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183 else:
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184 self._current_thing.leave()
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185 self._current_thing = None
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186 self._current_description = None
71
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187 for thing in self.things.itervalues():
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188 if thing.rect.collidepoint(pos):
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189 thing.enter(item)
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190 self._current_thing = thing
76
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191 self._current_description = self._make_description(
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192 thing.get_description())
71
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193 break
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194
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195
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196 class Thing(StatefulGizmo):
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197 """Base class for things in a scene that you can interact with."""
7
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198
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199 # sub-folder to look for resources in
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200 FOLDER = None
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201
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202 # name of image resource
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203 IMAGE = None
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204
68
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205 # Interact rectangle hi-light color (for debugging)
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206 # (set to None to turn off)
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207 if constants.DEBUG:
75
a62db6d10009 Red -> red
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208 _interact_hilight_color = Color('red')
68
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209 else:
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210 _interact_hilight_color = None
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211
39
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212 def __init__(self, name, rect):
55
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213 StatefulGizmo.__init__(self)
39
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214 self.name = name
68
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215 # area within scene to render to
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216 self.rect = Rect(rect)
39
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217 # area within scene that triggers calls to interact
68
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218 self.interact_rect = Rect(rect)
39
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219 # these are set by set_scene
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220 self.scene = None
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221 self.state = None
32
18cb1af411ef Add helper for adding items. Give items names. Make things take a rectangle.
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222 # TODO: add masks
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223 # TODO: add images
7
d7c9d8273d7f Start of base classes for game state.
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224
39
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225 def set_scene(self, scene):
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226 assert self.scene is None
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227 self.scene = scene
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228 self.state = scene.state
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229
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230 def message(self, msg):
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231 self.state.message(msg)
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232
63
3087be3463e0 Some framework support for better message handling
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diff changeset
233 def get_description(self):
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234 return None
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diff changeset
235
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diff changeset
236 def is_interactive(self):
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237 return True
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238
71
99c5506de7ea Start of interact handling.
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diff changeset
239 def enter(self, item):
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240 """Called when the cursor enters the Thing."""
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241 print "Enter %r -> %r" % (item, self)
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242
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243 def leave(self):
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244 """Called when the cursr leaves the Thing."""
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245 print "Leaves %r" % self
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246
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8e709824306d Add items and things.
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247 def interact(self, item):
56
75bf3d3689e9 Refactor thing interactivity and add "fake" bridge scene.
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diff changeset
248 if not self.is_interactive():
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diff changeset
249 return
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250 if item is None:
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251 self.interact_without()
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252 else:
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253 handler = getattr(self, 'interact_with_' + item.name, None)
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254 if handler is not None:
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diff changeset
255 handler(item)
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256 else:
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257 self.interact_default(item)
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258
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259 def interact_without(self):
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260 self.interact_default(None)
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261
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262 def interact_default(self, item):
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diff changeset
263 self.message("It doesn't work.")
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8e709824306d Add items and things.
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parents: 18
diff changeset
264
23
1e90a3e4618e Add code for blitting Scene.
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diff changeset
265 def draw(self, surface):
68
158a13a48d48 Show interact rectangles when constants.DEBUG is True.
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diff changeset
266 if self._interact_hilight_color is not None:
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diff changeset
267 frame_rect(surface, self._interact_hilight_color,
158a13a48d48 Show interact rectangles when constants.DEBUG is True.
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diff changeset
268 self.interact_rect.inflate(1, 1), 1)
158a13a48d48 Show interact rectangles when constants.DEBUG is True.
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diff changeset
269 # TODO: draw image if there is one
23
1e90a3e4618e Add code for blitting Scene.
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parents: 22
diff changeset
270
22
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parents: 18
diff changeset
271
8e709824306d Add items and things.
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272 class Item(object):
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273 """Base class for inventory items."""
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diff changeset
274
35
ebc76bc0c067 First item!
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diff changeset
275 # image for inventory
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diff changeset
276 INVENTORY_IMAGE = None
32
18cb1af411ef Add helper for adding items. Give items names. Make things take a rectangle.
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parents: 30
diff changeset
277
35
ebc76bc0c067 First item!
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diff changeset
278 def __init__(self, name):
ebc76bc0c067 First item!
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diff changeset
279 self.name = name
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diff changeset
280 self.inventory_image = get_image('items', self.INVENTORY_IMAGE)
32
18cb1af411ef Add helper for adding items. Give items names. Make things take a rectangle.
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diff changeset
281 # TODO: needs cursor
22
8e709824306d Add items and things.
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parents: 18
diff changeset
282
34
e5c043aeed65 Inventory and items. And stuff.
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diff changeset
283 def get_inventory_image(self):
e5c043aeed65 Inventory and items. And stuff.
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284 return self.inventory_image
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diff changeset
285