Mercurial > skaapsteker

annotate skaapsteker/engine.py @ 479:fb9258d66137

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New Main Menu
author Stefano Rivera <stefano@rivera.za.net>
date Sat, 09 Apr 2011 21:59:59 +0200
parents 95527fd29872
children 0675f390653c
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1 """Top-level engine for switching scenes."""
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2
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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 self.soundsystem = soundsystem
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27 def change_scene(self, next_scene):
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28 self.game_state.save_game()
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29 self.soundsystem.stop_music()
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30 if self._current_scene is not None:
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31 self._current_scene.leave()
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32 self._current_scene = next_scene
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33 self._current_scene.enter()
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35 def run(self):
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36 """Run the game loop dispatching events as necessary."""
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37 assert self._current_scene is not None
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38 clock = pygame.time.Clock()
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39 surface = pygame.display.get_surface()
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40 while True:
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41 events = pygame.event.get()
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42 for ev in events:
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43 if ev.type is QUIT:
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44 return
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45 if ChangeScene.matches(ev):
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46 next_scene = ev.next_scene
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47 if not isinstance(next_scene, Scene):
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48 next_scene = next_scene[0](self.game_state, self.soundsystem, *(next_scene[1:]))
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49 self.change_scene(next_scene)
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50 break
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51 self._current_scene.dispatch(ev)
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52 self._current_scene.draw(surface, self)
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53 pygame.display.flip()
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54 self._fpss[self._cur_frame] = 1000.0 / clock.tick(self._framerate)
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55 self._cur_frame = self._cur_frame + 1 if self._cur_frame < 99 else 0
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56
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57 def get_fps(self):
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58 return sum(self._fpss) / 100
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61 class Scene(object):
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62
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63 def __init__(self, game_state, soundsystem):
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64 self.widgets = []
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65 self.game_state = game_state
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66 self._soundsystem = soundsystem
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67
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68 def post(self, ev):
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69 """Post an event to pygame's event loop."""
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70 pygame.event.post(ev)
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71
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72 def enter(self):
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73 """Enter the scene."""
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74 pass
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75
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76 def leave(self):
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77 """Exit the scene."""
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78 pass
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79
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80 def dispatch(self, ev):
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81 """Dispatch an event."""
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82 for widget in self.widgets:
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83 widget.dispatch(ev)
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84
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85 def draw(self, surface, engine):
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86 """Update the scene surface."""
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87 for widget in self.widgets:
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88 widget.draw(surface)
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89
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90
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91 class UserEvent(object):
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92
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93 utype = "UNKNOWN"
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94
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95 @classmethod
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96 def post(cls, **kws):
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97 ev = pygame.event.Event(USEREVENT, utype=cls.utype, **kws)
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98 pygame.event.post(ev)
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99
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100 @classmethod
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101 def matches(cls, ev):
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102 return ev.type is USEREVENT and ev.utype == cls.utype
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103
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104
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105 class ChangeScene(UserEvent):
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106
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107 utype = "CHANGE_SCENE"
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108
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109 @classmethod
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110 def post(cls, next_scene):
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111 super(ChangeScene, cls).post(next_scene=next_scene)
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112
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113 class PlayerDied(UserEvent):
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114
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115 utype = "PLAYER_DIED"
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116
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117 @classmethod
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118 def post(cls):
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119 super(PlayerDied, cls).post()
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120
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121 class OpenDialog(UserEvent):
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122
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123 utype = "OPEN_DIALOG"
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124
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125 @classmethod
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126 def post(cls, npc):
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127 # request to open dialog box for given NPC sprite
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128 # will do nothing if the NPC's current state has
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129 # no text
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130 super(OpenDialog, cls).post(npc=npc)
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131
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132 class OpenNotification(UserEvent):
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133
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134 utype = "OPEN_NOTIFICATION"
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135
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136 @classmethod
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137 def post(cls, text):
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138 # request to open dialog box for given NPC sprite
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139 # will do nothing if the NPC's current state has
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140 # no text
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141 super(OpenNotification, cls).post(text=text)
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142
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143 class CloseDialog(UserEvent):
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144
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145 utype = "CLOSE_DIALOG"
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146
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147 @classmethod
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148 def post(cls, npc):
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149 # close dialog box for given NPC sprite
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150 # will do nothing if the sprite has no dialog open
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151 super(CloseDialog, cls).post(npc=npc)
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152
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153 class NpcEvent(UserEvent): # TODO: Needed?
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154
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155 utype = "NPC_EVENT"
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156
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157 @classmethod
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158 def post(cls, npc, ev):
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159 """npc is an NPC sprite.
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160 ev is a DsmEvent for that sprite.
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161 """
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162 super(NpcEvent, cls).post(npc=npc, ev=ev)
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163
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164 class GlobalNpcEvent(UserEvent): # TODO: Needed?
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165
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166 utype = "GLOBAL_NPC_EVENT"
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167
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168 @classmethod
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169 def post(cls, ev):
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170 """Send a DsmEvent event to all NPCs.
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171 """
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172 super(GlobalNpcEvent, cls).post(ev=ev)
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173
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174
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175 class AddSpriteEvent(UserEvent):
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176
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177 utype = "ADD_SPRITE_EVENT"
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178
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179 @classmethod
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180 def post(cls, item):
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181 """Put a Sprite into the world.
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182 """
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183 super(AddSpriteEvent, cls).post(item=item)