Mercurial > skaapsteker
annotate skaapsteker/engine.py @ 165:8d45715c587d
Rename ._game_state to game_state for consistency with engine and since everyone and their dog has access to it. :)
| author | Simon Cross <hodgestar@gmail.com> |
|---|---|
| date | Wed, 06 Apr 2011 00:09:56 +0200 |
| parents | aca8b7456c72 |
| children | 9d08f99b5ddf |
| rev | line source |
|---|---|
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Create game engine. Enable quitting.
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parents:
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1 """Top-level engine for switching scenes.""" |
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2 |
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3 import pygame.display |
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4 import pygame.time |
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5 import pygame.event |
| 14 | 6 from pygame.locals import QUIT, USEREVENT |
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7 |
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Initial game state stuff.
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8 from skaapsteker.gamestate import GameState |
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9 |
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10 class Engine(object): |
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11 |
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12 def __init__(self): |
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13 self._framerate = 60 |
| 14 | 14 self._current_scene = None |
| 123 | 15 self._fpss = [self._framerate] * 100 |
| 16 self._cur_frame = 0 | |
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17 self.game_state = GameState() |
| 14 | 18 |
| 19 def change_scene(self, next_scene): | |
| 20 if self._current_scene is not None: | |
| 21 self._current_scene.leave() | |
| 22 self._current_scene = next_scene | |
| 23 self._current_scene.enter() | |
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parents:
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24 |
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25 def run(self): |
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26 """Run the game loop dispatching events as necessary.""" |
| 14 | 27 assert self._current_scene is not None |
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28 clock = pygame.time.Clock() |
| 14 | 29 surface = pygame.display.get_surface() |
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30 while True: |
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31 events = pygame.event.get() |
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32 for ev in events: |
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33 if ev.type is QUIT: |
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34 return |
| 14 | 35 if ChangeScene.matches(ev): |
| 36 self.change_scene(ev.next_scene) | |
| 37 break | |
| 38 self._current_scene.dispatch(ev) | |
| 123 | 39 self._current_scene.draw(surface, self) |
| 14 | 40 pygame.display.flip() |
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126
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Fix bug in FPS calculation. Phew -- we're still fast.
Simon Cross <hodgestar@gmail.com>
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41 self._fpss[self._cur_frame] = 1000.0 / clock.tick(self._framerate) |
| 123 | 42 self._cur_frame = self._cur_frame + 1 if self._cur_frame < 99 else 0 |
| 43 | |
| 44 def get_fps(self): | |
| 45 return sum(self._fpss) / 100 | |
| 14 | 46 |
| 47 | |
| 48 class Scene(object): | |
| 49 | |
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50 def __init__(self, game_state): |
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79
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Simple menu screen and TextChoice widget
Stefano Rivera <stefano@rivera.za.net>
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51 self.widgets = [] |
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165
8d45715c587d
Rename ._game_state to game_state for consistency with engine and since everyone and their dog has access to it. :)
Simon Cross <hodgestar@gmail.com>
parents:
133
diff
changeset
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52 self.game_state = game_state |
| 14 | 53 |
| 54 def post(self, ev): | |
| 55 """Post an event to pygame's event loop.""" | |
| 56 pygame.event.post(ev) | |
| 57 | |
| 58 def enter(self): | |
| 59 """Enter the scene.""" | |
| 60 pass | |
| 61 | |
| 62 def leave(self): | |
| 63 """Exit the scene.""" | |
| 64 pass | |
| 65 | |
| 66 def dispatch(self, ev): | |
| 67 """Dispatch an event.""" | |
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Simple menu screen and TextChoice widget
Stefano Rivera <stefano@rivera.za.net>
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68 for widget in self.widgets: |
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Simple menu screen and TextChoice widget
Stefano Rivera <stefano@rivera.za.net>
parents:
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69 widget.dispatch(ev) |
| 14 | 70 |
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133
aca8b7456c72
Pass engine to all Scene draw() methods
Stefano Rivera <stefano@rivera.za.net>
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71 def draw(self, surface, engine): |
| 14 | 72 """Update the scene surface.""" |
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79
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Simple menu screen and TextChoice widget
Stefano Rivera <stefano@rivera.za.net>
parents:
14
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73 for widget in self.widgets: |
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fe8652a060df
Simple menu screen and TextChoice widget
Stefano Rivera <stefano@rivera.za.net>
parents:
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74 widget.draw(surface) |
| 14 | 75 |
| 76 | |
| 77 class UserEvent(object): | |
| 78 | |
| 79 utype = "UNKNOWN" | |
| 80 | |
| 81 @classmethod | |
| 82 def post(cls, **kws): | |
| 83 ev = pygame.event.Event(USEREVENT, utype=cls.utype, **kws) | |
| 84 pygame.event.post(ev) | |
| 85 | |
| 86 @classmethod | |
| 87 def matches(cls, ev): | |
| 88 return ev.type is USEREVENT and ev.utype == cls.utype | |
| 89 | |
| 90 class ChangeScene(UserEvent): | |
| 91 | |
| 92 utype = "CHANGE_SCENE" | |
| 93 | |
| 94 @classmethod | |
| 95 def post(cls, next_scene): | |
| 96 super(ChangeScene, cls).post(next_scene=next_scene) |