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