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annotate mamba/engine.py @ 152:8502e422cefc

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author Stefano Rivera <stefano@rivera.za.net>
date Tue, 13 Sep 2011 21:32:38 +0200
parents 45dd79e9ba1b
children b93845471311
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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, FPS
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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.time
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9 import pygame
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10 from pygame.locals import QUIT, USEREVENT
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13 class Engine(object):
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14 def __init__(self):
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15 self._habitat = None
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16 self._fps = FPS
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18 def set_habitat(self, habitat):
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19 if self._habitat is not None:
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20 self._habitat.on_exit()
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21 self._habitat = habitat
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22 if self._habitat is not None:
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23 self._habitat.on_enter()
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24
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25 def run(self):
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26 """Game loop."""
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27 get_events = pygame.event.get
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28 flip = pygame.display.flip
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29 clock = pygame.time.Clock()
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30 while True:
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31 events = get_events()
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32 for ev in events:
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33 if ev.type is QUIT:
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34 return
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35 elif NewHabitatEvent.matches(ev):
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36 self.set_habitat(ev.habitat)
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37 else:
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38 self._habitat.dispatch(ev)
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39 surface = pygame.display.get_surface()
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40 self._habitat.draw(surface)
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41 flip()
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42 self._fps = 1000.0 / clock.tick(FPS)
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44
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45 class Habitat(object):
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46
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47 def __init__(self, size=SCREEN):
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48 self.surface_size = size
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49 self.surface = None
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50 self.container = Container(pygame.Rect((0, 0), self.surface_size))
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52 def on_enter(self):
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53 """Called when this becomes the current habitat."""
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54 # Create the surface here as flipping between editor and
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55 # other things kills pygame.display
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56 self.surface = pygame.Surface(self.surface_size)
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58 def on_exit(self):
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59 """Called when this stops being the current habitat."""
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60 self.surface = None
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62 def dispatch(self, ev):
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63 self.container.event(ev)
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65 def draw(self, surface):
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66 if self.surface:
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67 self.surface.fill(pygame.Color('gray'))
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68 self.container.draw(self.surface)
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69 surface.blit(self.surface, self.surface.get_rect())
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72 class UserEvent(object):
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73
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74 TYPE = "UNKNOWN"
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76 @classmethod
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77 def post(cls, **kws):
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78 ev = pygame.event.Event(USEREVENT, utype=cls.TYPE, **kws)
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79 pygame.event.post(ev)
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81 @classmethod
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82 def matches(cls, ev):
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83 return ev.type is USEREVENT and ev.utype == cls.TYPE
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86 class NewHabitatEvent(UserEvent):
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87
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88 TYPE = "NEW_HABITAT"
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90 @classmethod
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91 def post(cls, habitat):
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92 super(NewHabitatEvent, cls).post(habitat=habitat)