Mercurial > pyntnclick

annotate gamelib/state.py @ 86:593bddfacf18

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Refactor Things a bit to render images.
author Simon Cross <hodgestar+bzr@gmail.com>
date Tue, 24 Aug 2010 00:14:23 +0200
parents d7c0a702a0b4
children 053bc8e167fc
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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 widgets import BoomLabel
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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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11
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12 class Result(object):
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13 """Result of interacting with a thing"""
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14
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15 def __init__(self, message=None):
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16 self.message = message
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17
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18
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19 def initial_state():
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20 """Load the initial state."""
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21 state = State()
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22 state.load_scenes("cryo")
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23 state.load_scenes("bridge")
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24 #state.load_scenes("mess")
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25 #state.load_scenes("engine")
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26 #state.load_scenes("machine")
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27 #state.load_scenes("map")
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28 state.set_current_scene("cryo")
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29 return state
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30
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31
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32 class State(object):
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33 """Complete game state.
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34
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35 Game state consists of:
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37 * items
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38 * scenes
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39 """
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40
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41 def __init__(self):
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42 # map of scene name -> Scene object
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43 self.scenes = {}
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44 # map of item name -> Item object
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45 self.items = {}
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46 # list of item objects in inventory
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47 self.inventory = []
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48 # currently selected tool (item)
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49 self.tool = None
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50 # current scene
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51 self.current_scene = None
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52
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53 def add_scene(self, scene):
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54 self.scenes[scene.name] = scene
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55
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56 def add_item(self, item):
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57 self.items[item.name] = item
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58
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59 def load_scenes(self, modname):
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60 mod = __import__("gamelib.scenes.%s" % (modname,), fromlist=[modname])
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61 for scene_cls in mod.SCENES:
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62 self.add_scene(scene_cls(self))
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63
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64 def set_current_scene(self, name):
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65 self.current_scene = self.scenes[name]
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66
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67 def add_inventory_item(self, name):
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68 self.inventory.append(self.items[name])
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69
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70 def remove_inventory_item(self, name):
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71 self.inventory.remove(self.items[name])
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72
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73 def set_tool(self, item):
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74 self.tool = item
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75
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76 def draw(self, surface):
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77 self.current_scene.draw(surface)
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79 def interact(self, pos):
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80 return self.current_scene.interact(self.tool, pos)
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81
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82 def mouse_move(self, pos):
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83 self.current_scene.mouse_move(self.tool, pos)
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84
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85
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86 class StatefulGizmo(object):
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87
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88 # initial data (optional, defaults to none)
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89 INITIAL_DATA = None
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90
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91 def __init__(self):
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92 self.data = {}
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93 if self.INITIAL_DATA:
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94 self.data.update(self.INITIAL_DATA)
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95
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96 def set_data(self, key, value):
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97 self.data[key] = value
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98
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99 def get_data(self, key):
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100 return self.data.get(key, None)
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101
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102
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103 class Scene(StatefulGizmo):
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104 """Base class for scenes."""
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105
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106 # sub-folder to look for resources in
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107 FOLDER = None
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108
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109 # name of background image resource
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110 BACKGROUND = None
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111
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112 # name of scene (optional, defaults to folder)
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113 NAME = None
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114
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115 def __init__(self, state):
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116 StatefulGizmo.__init__(self)
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117 # scene name
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118 self.name = self.NAME if self.NAME is not None else self.FOLDER
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119 # link back to state object
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120 self.state = state
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121 # map of thing names -> Thing objects
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122 self.things = {}
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123 self._background = get_image(self.FOLDER, self.BACKGROUND)
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124 self._current_thing = None
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125 self._current_description = None
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126
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127 def add_item(self, item):
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128 self.state.add_item(item)
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129
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130 def add_thing(self, thing):
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131 self.things[thing.name] = thing
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132 thing.set_scene(self)
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133
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134 def remove_thing(self, thing):
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135 del self.things[thing.name]
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136
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137 def _make_description(self, text):
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138 if text is None:
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139 return None
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140 label = BoomLabel(text)
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141 label.set_margin(5)
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142 label.border_width = 1
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143 label.border_color = (0, 0, 0)
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144 label.bg_color = (127, 127, 127)
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145 label.fg_color = (0, 0, 0)
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146 return label
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147
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148 def draw_description(self, surface):
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149 if self._current_description is not None:
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150 sub = surface.subsurface(
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151 Rect(5, 5, *self._current_description.size))
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152 self._current_description.draw_all(sub)
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153
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154 def draw_background(self, surface):
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155 surface.blit(self._background, (0, 0), None, BLEND_ADD)
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156
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157 def draw_things(self, surface):
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158 for thing in self.things.itervalues():
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159 thing.draw(surface)
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160
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161 def draw(self, surface):
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162 self.draw_background(surface)
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163 self.draw_things(surface)
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164 self.draw_description(surface)
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165
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166 def interact(self, item, pos):
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167 """Interact with a particular position.
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168
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169 Item may be an item in the list of items or None for the hand.
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170
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171 Returns a Result object to provide feedback to the player.
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172 """
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173 for thing in self.things.itervalues():
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174 if thing.rect.collidepoint(pos):
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175 result = thing.interact(item)
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176 if result:
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177 if self._current_thing:
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178 # Also update descriptions if needed
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179 self._current_description = self._make_description(
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180 self._current_thing.get_description())
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181 return result
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182
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183 def mouse_move(self, item, pos):
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184 """Call to check whether the cursor has entered / exited a thing.
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185
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186 Item may be an item in the list of items or None for the hand.
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187 """
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188 if self._current_thing is not None:
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189 if self._current_thing.rect.collidepoint(pos):
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190 return
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191 else:
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192 self._current_thing.leave()
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193 self._current_thing = None
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194 self._current_description = None
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195 for thing in self.things.itervalues():
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196 if thing.rect.collidepoint(pos):
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197 thing.enter(item)
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198 self._current_thing = thing
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199 self._current_description = self._make_description(
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200 thing.get_description())
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201 break
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202
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203
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204 class Interact(object):
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205
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206 def __init__(self, image, rect, interact_rect):
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207 self.image = image
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208 self.rect = rect
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209 self.interact_rect = interact_rect
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210
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211 def set_thing(self, thing):
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212 pass
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213
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214 def draw(self, surface):
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215 if self.image is not None:
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216 surface.blit(self.image, self.rect, None, BLEND_ADD)
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217
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218
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219 class InteractNoImage(Interact):
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220
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221 def __init__(self, x, y, w, h):
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222 super(InteractNoImage, self).__init__(None, None, Rect(x, y, w, h))
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223
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224
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225 class InteractImage(Interact):
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226
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227 def __init__(self, x, y, image_name):
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228 super(InteractImage, self).__init__(None, None, None)
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229 self._pos = (x, y)
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230 self._image_name = image_name
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231
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232 def set_thing(self, thing):
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233 self.image = get_image(thing.folder, self._image_name)
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234 self.rect = Rect(self._pos, self.image.get_size())
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235 self.interact_rect = self.rect
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236
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237
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238 class Thing(StatefulGizmo):
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239 """Base class for things in a scene that you can interact with."""
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240
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241 # name of thing
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242 NAME = None
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243
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244 # sub-folder to look for resources in (defaults to scenes folder)
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245 FOLDER = None
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246
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247 # list of Interact objects
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248 INTERACTS = {}
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249
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250 # name first interact
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251 INITIAL = None
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252
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253 # Interact rectangle hi-light color (for debugging)
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254 # (set to None to turn off)
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255 if constants.DEBUG:
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a62db6d10009 Red -> red
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256 _interact_hilight_color = Color('red')
68
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257 else:
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258 _interact_hilight_color = None
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259
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260 def __init__(self):
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261 StatefulGizmo.__init__(self)
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262 # name of the thing
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263 self.name = self.NAME
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264 # folder for resource (None is overridden by scene folder)
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265 self.folder = self.FOLDER
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266 # interacts
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267 self.interacts = self.INTERACTS
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268 # these are set by set_scene
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269 self.scene = None
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270 self.state = None
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271 self.current_interact = None
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272 self.rect = None
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273 # TODO: add masks
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274
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275 def set_scene(self, scene):
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276 assert self.scene is None
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277 self.scene = scene
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278 if self.folder is None:
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279 self.folder = scene.FOLDER
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280 self.state = scene.state
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281 for interact in self.interacts.itervalues():
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282 interact.set_thing(self)
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283 self.set_interact(self.INITIAL)
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284
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285 def set_interact(self, name):
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286 self.current_interact = self.interacts[name]
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287 self.rect = self.current_interact.interact_rect
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288 assert self.rect is not None, name
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289
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290 def get_description(self):
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291 return None
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292
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293 def is_interactive(self):
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294 return True
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295
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296 def enter(self, item):
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297 """Called when the cursor enters the Thing."""
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298 print "Enter %r -> %r" % (item, self)
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299
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300 def leave(self):
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301 """Called when the cursr leaves the Thing."""
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302 print "Leaves %r" % self
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303
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304 def interact(self, item):
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305 if not self.is_interactive():
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306 return
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307 if item is None:
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308 return self.interact_without()
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309 else:
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310 handler = getattr(self, 'interact_with_' + item.name, None)
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311 if handler is not None:
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312 return handler(item)
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313 else:
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314 return self.interact_default(item)
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315
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316 def interact_without(self):
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317 return self.interact_default(None)
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318
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319 def interact_default(self, item):
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320 return Result("It doesn't work.")
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321
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322 def draw(self, surface):
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323 self.current_interact.draw(surface)
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324 if self._interact_hilight_color is not None:
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325 frame_rect(surface, self._interact_hilight_color,
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326 self.rect.inflate(1, 1), 1)
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327
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328
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329 class Item(object):
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330 """Base class for inventory items."""
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331
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332 # image for inventory
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333 INVENTORY_IMAGE = None
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334
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335 def __init__(self, name):
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336 self.name = name
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337 self.inventory_image = get_image('items', self.INVENTORY_IMAGE)
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338 # TODO: needs cursor
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339
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340 def get_inventory_image(self):
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341 return self.inventory_image
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342