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annotate nagslang/engine.py @ 341:63d0c70a4e15

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Enemies can hurt things again. (Oops.)
author Jeremy Thurgood <firxen@gmail.com>
date Fri, 06 Sep 2013 12:55:48 +0200
parents a4e93b1086b8
children a7d48819a711
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1 """Top-level event dispatching and area transition."""
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3 import pygame
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4 import pygame.locals as pgl
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6 from nagslang import constants
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7 from nagslang.screens.menu import MenuScreen
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8 from nagslang.screens.area import AreaScreen
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9 from nagslang.screens.playerdied import PlayerDiedScreen
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10 from nagslang.events import ScreenChange
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11 from nagslang.world import World
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14 class Engine(object):
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15 def __init__(self, surface):
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16 self._surface = surface
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17 self._clock = pygame.time.Clock()
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18 self._fps = constants.FPS
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19 self._dt = 1. / self._fps
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20 self._world = World()
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21 self._current_screen = None
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22 self._screens = {
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23 'menu': MenuScreen,
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24 'dead': PlayerDiedScreen,
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25 }
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26 for area_name in AreaScreen.list_areas():
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27 self._screens[area_name] = AreaScreen
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28 self._world.load()
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29 self.change_screen('menu')
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30 # Dummy resize event, to force us to realise our real size
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31 # http://stackoverflow.com/q/16442573/8629
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32 pygame.event.post(pygame.event.Event(pgl.VIDEORESIZE,
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33 size=(0, 0), w=0, h=0))
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34
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35 def change_screen(self, new_screen):
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36 if self._current_screen is not None:
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37 self._current_screen.teardown()
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38 screen_cls = self._screens[new_screen]
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39 self._current_screen = screen_cls(new_screen, self._world)
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40 self._current_screen.setup()
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42 def run(self):
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43 running = True
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44 while running:
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45 for ev in pygame.event.get():
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46 if ev.type == pgl.QUIT:
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47 running = False
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48 elif ev.type == pgl.VIDEORESIZE:
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49 pygame.display.set_mode(ev.size,
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50 pgl.SWSURFACE | pgl.RESIZABLE)
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51 self._surface = pygame.display.get_surface()
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52 elif ScreenChange.matches(ev):
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53 self._world.save()
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54 self._surface.fill(pygame.color.Color(0, 0, 0))
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55 self.change_screen(ev.screen)
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56 else:
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57 self._current_screen.handle_event(ev)
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58 self._current_screen.tick(self._dt)
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59 self._current_screen.render(self._surface)
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60 pygame.display.flip()
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61 self._clock.tick(self._fps)