annotate gamelib/state.py @ 76:1a5fdc225939

Add description rendering to scene rendering.
author Simon Cross <hodgestar+bzr@gmail.com>
date Mon, 23 Aug 2010 22:11:41 +0200
parents a62db6d10009
children bb7c8072f8c0
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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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34
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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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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 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 label.margin = 5
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136 label.border_width = 1
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137 label.border_color = (0, 0, 0)
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138 label.bg_color = (127, 127, 127)
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139 label.fg_color = (0, 0, 0)
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140 return label
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141
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142 def draw_description(self, surface):
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143 if self._current_description is not None:
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144 self._current_description.draw(surface)
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145
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146 def draw_background(self, surface):
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147 surface.blit(self._background, (0, 0), None, BLEND_ADD)
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148
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149 def draw_things(self, surface):
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150 for thing in self.things.itervalues():
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151 thing.draw(surface)
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152
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153 def draw(self, surface):
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154 self.draw_background(surface)
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155 self.draw_things(surface)
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156 self.draw_description(surface)
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157
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158 def interact(self, item, pos):
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159 """Interact with a particular position.
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160
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161 Item may be an item in the list of items or None for the hand.
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162 """
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163 for thing in self.things.itervalues():
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164 if thing.rect.collidepoint(pos):
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165 thing.interact(item)
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166 break
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167
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168 def mouse_move(self, item, pos):
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169 """Call to check whether the cursor has entered / exited a thing.
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170
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171 Item may be an item in the list of items or None for the hand.
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172 """
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173 if self._current_thing is not None:
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174 if self._current_thing.rect.collidepoint(pos):
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175 return
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176 else:
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177 self._current_thing.leave()
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178 self._current_thing = None
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179 self._current_description = None
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180 for thing in self.things.itervalues():
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181 if thing.rect.collidepoint(pos):
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182 thing.enter(item)
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183 self._current_thing = thing
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184 self._current_description = self._make_description(
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185 thing.get_description())
71
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186 break
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187
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188
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189 class Thing(StatefulGizmo):
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190 """Base class for things in a scene that you can interact with."""
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191
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192 # sub-folder to look for resources in
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193 FOLDER = None
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194
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195 # name of image resource
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196 IMAGE = None
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197
68
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198 # Interact rectangle hi-light color (for debugging)
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199 # (set to None to turn off)
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200 if constants.DEBUG:
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a62db6d10009 Red -> red
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201 _interact_hilight_color = Color('red')
68
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202 else:
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203 _interact_hilight_color = None
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204
39
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205 def __init__(self, name, rect):
55
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206 StatefulGizmo.__init__(self)
39
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207 self.name = name
68
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208 # area within scene to render to
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209 self.rect = Rect(rect)
39
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210 # area within scene that triggers calls to interact
68
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211 self.interact_rect = Rect(rect)
39
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212 # these are set by set_scene
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213 self.scene = None
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214 self.state = None
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215 # TODO: add masks
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216 # TODO: add images
7
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217
39
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218 def set_scene(self, scene):
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219 assert self.scene is None
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220 self.scene = scene
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221 self.state = scene.state
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222
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223 def message(self, msg):
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224 self.state.message(msg)
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225
63
3087be3463e0 Some framework support for better message handling
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226 def get_description(self):
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227 return None
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diff changeset
228
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229 def is_interactive(self):
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230 return True
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231
71
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232 def enter(self, item):
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233 """Called when the cursor enters the Thing."""
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234 print "Enter %r -> %r" % (item, self)
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235
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236 def leave(self):
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237 """Called when the cursr leaves the Thing."""
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238 print "Leaves %r" % self
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239
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8e709824306d Add items and things.
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240 def interact(self, item):
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75bf3d3689e9 Refactor thing interactivity and add "fake" bridge scene.
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241 if not self.is_interactive():
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242 return
41
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243 if item is None:
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244 self.interact_without()
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245 else:
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246 handler = getattr(self, 'interact_with_' + item.name, None)
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247 if handler is not None:
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diff changeset
248 handler(item)
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249 else:
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250 self.interact_default(item)
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251
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252 def interact_without(self):
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253 self.interact_default(None)
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254
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255 def interact_default(self, item):
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diff changeset
256 self.message("It doesn't work.")
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8e709824306d Add items and things.
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diff changeset
257
23
1e90a3e4618e Add code for blitting Scene.
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diff changeset
258 def draw(self, surface):
68
158a13a48d48 Show interact rectangles when constants.DEBUG is True.
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diff changeset
259 if self._interact_hilight_color is not None:
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diff changeset
260 frame_rect(surface, self._interact_hilight_color,
158a13a48d48 Show interact rectangles when constants.DEBUG is True.
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diff changeset
261 self.interact_rect.inflate(1, 1), 1)
158a13a48d48 Show interact rectangles when constants.DEBUG is True.
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diff changeset
262 # TODO: draw image if there is one
23
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parents: 22
diff changeset
263
22
8e709824306d Add items and things.
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parents: 18
diff changeset
264
8e709824306d Add items and things.
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diff changeset
265 class Item(object):
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266 """Base class for inventory items."""
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diff changeset
267
35
ebc76bc0c067 First item!
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diff changeset
268 # image for inventory
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diff changeset
269 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
270
35
ebc76bc0c067 First item!
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diff changeset
271 def __init__(self, name):
ebc76bc0c067 First item!
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272 self.name = name
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273 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
274 # TODO: needs cursor
22
8e709824306d Add items and things.
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diff changeset
275
34
e5c043aeed65 Inventory and items. And stuff.
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diff changeset
276 def get_inventory_image(self):
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277 return self.inventory_image
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diff changeset
278