naja/engine.py

   1 import pygame
   2 import pygame.locals as pgl
   3
   4 from naja.constants import FPS
   5 from naja.events import SceneChangeEvent, QuitGameEvent
   6
   7
   8 class Engine(object):
   9     def __init__(self, surface, scene):
  10         self._surface = surface
  11         self._scene = scene
  12
  13     def run(self):
  14         clock = pygame.time.Clock()
  15         while True:
  16             self._surface.fill((0, 0, 0))
  17             for ev in pygame.event.get():
  18                 if ev.type == pgl.QUIT or QuitGameEvent.matches(ev):
  19                     self.quit_game()
  20                     return
  21                 elif SceneChangeEvent.matches(ev):
  22                     self.change_scene(ev.scene)
  23                 else:
  24                     self._scene.handle_event(ev)
  25             self._scene.render(self._surface)
  26             pygame.display.flip()
  27             clock.tick(FPS)
  28
  29     def change_scene(self, scene):
  30         self._scene.exit()
  31         self._scene = scene
  32         self._scene.enter()
  33
  34     def quit_game(self):
  35         self._scene.exit()
  36         self._scene = None