Mercurial > mamba

annotate mamba/engine.py @ 62:40be38f4427c

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Bug squashing.
author Simon Cross <hodgestar@gmail.com>
date Sun, 11 Sep 2011 16:40:44 +0200
parents fc4b7db1d832
children fbb5cc655b47
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0196455fa432 Minimal event loop.
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1 """Game engine and top-level game loop."""
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2
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3 from mamba.constants import SCREEN
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4 from mamba.widgets.base import Container
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5
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6 import pygame.event
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7 import pygame.display
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8 import pygame
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9 from pygame.locals import QUIT, USEREVENT
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12 class Engine(object):
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13 def __init__(self):
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14 self._habitat = None
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16 def set_habitat(self, habitat):
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17 if self._habitat is not None:
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18 self._habitat.on_exit()
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19 self._habitat = habitat
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20 if self._habitat is not None:
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21 self._habitat.on_enter()
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22
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23 def run(self):
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24 """Game loop."""
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25 get_events = pygame.event.get
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26 flip = pygame.display.flip
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27 surface = pygame.display.get_surface()
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28 while True:
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29 events = get_events()
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30 for ev in events:
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31 if ev.type is QUIT:
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32 return
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33 elif NewHabitatEvent.matches(ev):
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34 self.set_habitat(ev.habitat)
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35 else:
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36 self._habitat.dispatch(ev)
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37 self._habitat.draw(surface)
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38 flip()
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40
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41 class Habitat(object):
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43 def __init__(self):
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44 self.surface = pygame.Surface(SCREEN)
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45 self.container = Container(pygame.Rect((0, 0), SCREEN))
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47 def on_enter(self):
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48 """Called when this becomes the current habitat."""
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49 pass
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51 def on_exit(self):
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52 """Called when this stops being the current habitat."""
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53 pass
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54
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55 def dispatch(self, ev):
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56 self.container.event(ev)
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57
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58 def draw(self, surface):
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59 self.surface.fill(pygame.Color('black'))
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60 self.container.draw(self.surface)
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61 surface.blit(self.surface, self.surface.get_rect())
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63
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64 class UserEvent(object):
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65
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66 TYPE = "UNKNOWN"
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67
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68 @classmethod
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69 def post(cls, **kws):
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70 ev = pygame.event.Event(USEREVENT, utype=cls.TYPE, **kws)
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71 pygame.event.post(ev)
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73 @classmethod
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74 def matches(cls, ev):
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75 return ev.type is USEREVENT and ev.utype == cls.TYPE
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78 class NewHabitatEvent(UserEvent):
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80 TYPE = "NEW_HABITAT"
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82 @classmethod
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83 def post(cls, habitat):
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84 super(NewHabitatEvent, cls).post(habitat=habitat)