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comparison pyntnclick/engine.py @ 596:5496dcd16a84 pyntnclick

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Add pyntnclick.engine, based on mamba
author Stefano Rivera <stefano@rivera.za.net>
date Sat, 11 Feb 2012 18:22:57 +0200
parents
children fabce47e542f
comparison
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595:59f1ee3f5632 596:5496dcd16a84
1 """Game engine and top-level game loop."""
2
3 import pygame
4 import pygame.event
5 import pygame.display
6 import pygame.time
7 from pygame.locals import QUIT, USEREVENT
8
9
10 class Engine(object):
11 def __init__(self, game_description):
12 self._screen = None
13 self._game_description = game_description
14
15 def set_screen(self, screen):
16 if self._screen is not None:
17 self._screen.on_exit()
18 self._screen = screen
19 if self._screen is not None:
20 self._screen.on_enter()
21
22 def run(self):
23 """Game loop."""
24
25 get_events = pygame.event.get
26 flip = pygame.display.flip
27 clock = pygame.time.Clock()
28 while True:
29 events = get_events()
30 for ev in events:
31 if ev.type == QUIT:
32 return
33 elif ScreenChangeEvent.matches(ev):
34 self.set_habitat(ev.habitat)
35 else:
36 self._screen.dispatch(ev)
37 surface = pygame.display.get_surface()
38 self._habitat.draw(surface)
39 flip()
40 self._fps = 1000.0 / clock.tick(
41 self.game_description.constants.fps)
42
43
44 class UserEvent(object):
45 """A user event type allowing subclassing,
46 to provide an infinate number of user-defined events
47 """
48
49 TYPE = "UNKNOWN"
50
51 @classmethod
52 def post(cls, **kws):
53 ev = pygame.event.Event(USEREVENT, utype=cls.TYPE, **kws)
54 pygame.event.post(ev)
55
56 @classmethod
57 def matches(cls, ev):
58 return ev.type == USEREVENT and ev.utype == cls.TYPE
59
60
61 class ScreenChangeEvent(UserEvent):
62
63 TYPE = "SCREEN_CHANGE"
64
65 @classmethod
66 def post(cls, screen):
67 super(ScreenChangeEvent, cls).post(screen=screen)