Mercurial > skaapsteker

annotate skaapsteker/engine.py @ 447:4bec05fed6c7

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Load and save.
author Jeremy Thurgood <firxen@gmail.com>
date Sat, 09 Apr 2011 20:03:18 +0200
parents 87246b84a851
children 95527fd29872
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1 """Top-level engine for switching scenes."""
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2
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4bec05fed6c7 Load and save.
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3 import os
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4
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5 import pygame.display
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6 import pygame.time
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7 import pygame.event
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8 from pygame.locals import QUIT, USEREVENT
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10 from . import options
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12
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13 class Engine(object):
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15 def __init__(self, soundsystem):
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16 # avoid circular imports
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17 from .gamestate import GameState
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18 self._framerate = 60
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19 self._current_scene = None
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20 self._fpss = [self._framerate] * 100
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21 self._cur_frame = 0
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22 self.game_state = GameState(os.path.join(options['save_location'], 'savegame.json'))
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23 if self.game_state.can_resume():
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24 self.game_state.load_game()
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25 else:
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26 self.game_state.new_game()
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27 self.soundsystem = soundsystem
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29 def change_scene(self, next_scene):
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30 self.game_state.save_game()
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31 self.soundsystem.stop_music()
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32 if self._current_scene is not None:
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33 self._current_scene.leave()
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34 self._current_scene = next_scene
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35 self._current_scene.enter()
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36
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37 def run(self):
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38 """Run the game loop dispatching events as necessary."""
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39 assert self._current_scene is not None
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40 clock = pygame.time.Clock()
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41 surface = pygame.display.get_surface()
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42 while True:
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43 events = pygame.event.get()
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44 for ev in events:
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45 if ev.type is QUIT:
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46 return
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47 if ChangeScene.matches(ev):
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48 next_scene = ev.next_scene
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49 if not isinstance(next_scene, Scene):
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50 next_scene = next_scene[0](self.game_state, self.soundsystem, *(next_scene[1:]))
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51 self.change_scene(next_scene)
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52 break
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53 self._current_scene.dispatch(ev)
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54 self._current_scene.draw(surface, self)
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55 pygame.display.flip()
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56 self._fpss[self._cur_frame] = 1000.0 / clock.tick(self._framerate)
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57 self._cur_frame = self._cur_frame + 1 if self._cur_frame < 99 else 0
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58
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59 def get_fps(self):
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60 return sum(self._fpss) / 100
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61
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62
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63 class Scene(object):
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64
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65 def __init__(self, game_state, soundsystem):
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66 self.widgets = []
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67 self.game_state = game_state
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68 self._soundsystem = soundsystem
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69
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70 def post(self, ev):
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71 """Post an event to pygame's event loop."""
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72 pygame.event.post(ev)
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73
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74 def enter(self):
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75 """Enter the scene."""
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76 pass
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78 def leave(self):
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79 """Exit the scene."""
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80 pass
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81
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82 def dispatch(self, ev):
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83 """Dispatch an event."""
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84 for widget in self.widgets:
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85 widget.dispatch(ev)
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86
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87 def draw(self, surface, engine):
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88 """Update the scene surface."""
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89 for widget in self.widgets:
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90 widget.draw(surface)
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91
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92
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93 class UserEvent(object):
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94
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95 utype = "UNKNOWN"
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96
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97 @classmethod
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98 def post(cls, **kws):
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99 ev = pygame.event.Event(USEREVENT, utype=cls.utype, **kws)
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100 pygame.event.post(ev)
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101
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102 @classmethod
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103 def matches(cls, ev):
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104 return ev.type is USEREVENT and ev.utype == cls.utype
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105
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106 class ChangeScene(UserEvent):
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107
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108 utype = "CHANGE_SCENE"
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109
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110 @classmethod
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111 def post(cls, next_scene):
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112 super(ChangeScene, cls).post(next_scene=next_scene)
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113
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114 class PlayerDied(UserEvent):
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115
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116 utype = "PLAYER_DIED"
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117
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118 @classmethod
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119 def post(cls):
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120 super(PlayerDied, cls).post()
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121
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122 class OpenDialog(UserEvent):
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123
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124 utype = "OPEN_DIALOG"
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125
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126 @classmethod
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127 def post(cls, npc):
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128 # request to open dialog box for given NPC sprite
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129 # will do nothing if the NPC's current state has
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130 # no text
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131 super(OpenDialog, cls).post(npc=npc)
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132
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133 class OpenNotification(UserEvent):
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134
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135 utype = "OPEN_NOTIFICATION"
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136
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137 @classmethod
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138 def post(cls, text):
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139 # request to open dialog box for given NPC sprite
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140 # will do nothing if the NPC's current state has
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141 # no text
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142 super(OpenNotification, cls).post(text=text)
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143
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144 class CloseDialog(UserEvent):
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145
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146 utype = "CLOSE_DIALOG"
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147
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148 @classmethod
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149 def post(cls, npc):
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150 # close dialog box for given NPC sprite
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151 # will do nothing if the sprite has no dialog open
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152 super(CloseDialog, cls).post(npc=npc)
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153
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154 class NpcEvent(UserEvent): # TODO: Needed?
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155
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156 utype = "NPC_EVENT"
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157
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158 @classmethod
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159 def post(cls, npc, ev):
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160 """npc is an NPC sprite.
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161 ev is a DsmEvent for that sprite.
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162 """
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163 super(NpcEvent, cls).post(npc=npc, ev=ev)
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164
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165 class GlobalNpcEvent(UserEvent): # TODO: Needed?
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166
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167 utype = "GLOBAL_NPC_EVENT"
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168
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169 @classmethod
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170 def post(cls, ev):
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171 """Send a DsmEvent event to all NPCs.
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172 """
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173 super(GlobalNpcEvent, cls).post(ev=ev)
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174
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175
339
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176 class AddSpriteEvent(UserEvent):
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177
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178 utype = "ADD_SPRITE_EVENT"
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179
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180 @classmethod
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181 def post(cls, item):
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182 """Put a Sprite into the world.
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183 """
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184 super(AddSpriteEvent, cls).post(item=item)