naja/engine.py

   1 import pygame
   2 import pygame.locals as pgl
   3
   4 from naja.events import SceneChangeEvent, QuitGameEvent
   5
   6
   7 class Engine(object):
   8     def __init__(self, surface, scene):
   9         self._surface = surface
  10         self._scene = scene
  11
  12     def run(self):
  13         while True:
  14             for ev in pygame.event.get():
  15                 if ev.type == pgl.QUIT or QuitGameEvent.matches(ev):
  16                     self.quit_game()
  17                     return
  18                 elif SceneChangeEvent.matches(ev):
  19                     self.change_scene(ev.scene)
  20                 else:
  21                     self._scene.handle_event(ev)
  22             self._scene.render(self._surface)
  23             pygame.display.flip()
  24
  25     def change_scene(self, scene):
  26         self._scene.exit()
  27         self._scene = scene
  28         self._scene.enter()
  29
  30     def quit_game(self):
  31         self._scene.exit()
  32         self._scene = None