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annotate mamba/engine.py @ 208:c35e22dc225a

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Prepare for circular import
author Stefano Rivera <stefano@rivera.za.net>
date Wed, 14 Sep 2011 20:30:34 +0200
parents b93845471311
children 7a9be9add4c7
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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
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5 import pygame.event
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6 import pygame.display
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7 import pygame.time
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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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15 self._fps = FPS
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16
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17 def set_habitat(self, habitat):
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18 if self._habitat is not None:
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19 self._habitat.on_exit()
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20 self._habitat = habitat
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21 if self._habitat is not None:
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22 self._habitat.on_enter()
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23
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24 def run(self):
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25 """Game loop."""
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26 get_events = pygame.event.get
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27 flip = pygame.display.flip
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28 clock = pygame.time.Clock()
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29 while True:
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30 events = get_events()
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31 for ev in events:
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32 if ev.type is QUIT:
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33 return
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34 elif NewHabitatEvent.matches(ev):
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35 self.set_habitat(ev.habitat)
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36 else:
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37 self._habitat.dispatch(ev)
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38 surface = pygame.display.get_surface()
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39 self._habitat.draw(surface)
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40 flip()
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41 self._fps = 1000.0 / clock.tick(FPS)
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43
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44 class Habitat(object):
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45
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46 def __init__(self, size=SCREEN):
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47 from mamba.widgets.base import Container
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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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57
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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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64
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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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71
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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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89
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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)
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93
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94
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95 class SnakeDiedEvent(UserEvent):
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96
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97 TYPE = "SNAKE_DIED"
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98
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99 @classmethod
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100 def post(cls):
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101 super(SnakeDiedEvent, cls).post()