1 """ Scene utilities. """
7 """ Decorator that applies events to an engine. """
9 def wrap(self, *args, **kw):
10 events = f(self, *args, **kw)
11 self._apply_events(events)
16 """ A holder for game state & scene management.
19 def __init__(self, app, scene, world):
23 self._update_vehicle = False
25 def _apply_events(self, events):
31 def change_scene(self, scene):
32 print('here', self._scene)
33 self._apply_events(self._scene.exit(self._world.proxy()))
35 print('there', self._scene)
36 self._apply_events(self._scene.enter(self._world.proxy()))
38 def change_world(self, *args, **kw):
39 self._world.apply_event(*args, **kw)
42 from pgzero.game import exit
45 def move_screen(self, offset):
46 self._scene.move_screen(offset)
50 return self._scene.update(self._world.proxy(), self, dt)
53 self._scene.draw(self._app.screen)
56 def on_mouse_down(self, pos, button):
57 return self._scene.on_mouse_down(pos, button)
60 def on_mouse_up(self, pos, button):
61 return self._scene.on_mouse_up(pos, button)
64 def on_key_down(self, key, mod, unicode):
65 return self._scene.on_key_down(key, mod, unicode)
68 def on_key_up(self, key, mod):
69 return self._scene.on_key_up(key, mod)
72 def on_music_end(self):
73 return self._scene.on_music_end()
77 """ Base class for events. """
79 ENGINE_METHOD = "unknown_event"
81 def __init__(self, *args, **kw):
85 def apply(self, engine):
86 getattr(engine, self.ENGINE_METHOD)(*self._args, **self._kw)
89 class ChangeSceneEvent(Event):
90 """ Change to a new scene. """
92 ENGINE_METHOD = "change_scene"
95 class WorldEvent(Event):
96 """ Be a hero. Change the world. """
98 ENGINE_METHOD = "change_world"
101 class QuitEvent(Event):
102 """ Quit the game. """
104 ENGINE_METHOD = "quit_game"
107 class MoveViewportEvent(Event):
108 """ Change to a new scene. """
110 ENGINE_METHOD = "move_screen"
114 """ A single layer of actors. """
116 def __init__(self, name):
121 return iter(self.actors)
123 def __getitem__(self, i):
124 return self.actors[i]
127 return len(self.actors)
129 def add(self, actor):
130 self.actors.append(actor)
136 def remove(self, actor):
137 self.actors.remove(actor)
142 """ Layers of actors.
144 Actors may be rendered in different layers. Layers with lower levels
145 are rendered lower than layers with higher ones.
149 self._ordered_layers = []
151 self.add_layer("default", 0)
153 def __getattr__(self, name):
154 return self._layers[name]
156 def add_layer(self, name, level):
157 layer = self._layers[name] = Layer(name)
158 self._ordered_layers.append((level, name))
159 self._ordered_layers.sort()
162 def add(self, actor, layer="default"):
163 return self._layers[layer].add(actor)
165 def remove(self, actor, layer="default"):
166 return self._layers[layer].remove(actor)
168 def draw(self, screen):
169 for lvl, name in self._ordered_layers:
170 for actor in self._layers[name]:
171 # actor.draw doesn't allow blitting to anything other than
173 screen.blit(actor._surf, actor.topleft)
176 def defer_to_update(f):
177 """ Defers a function until the next update run. """
179 def wrapper(self, *args, **kw):
180 self._deferred_updates.append((f, args, kw))
185 """ Base class for scenes. """
188 self.actors = Actors()
189 self.viewport = (0, 0)
190 self._deferred_updates = []
192 def move_screen(self, offset):
193 self.viewport = (self.viewport[0] + offset[0],
194 self.viewport[1] + offset[1])
196 def calc_offset(self, x, y):
197 """ Return a position offset by the viewport. """
198 return x - self.viewport[0], y - self.viewport[1]
200 def enter(self, world):
203 def exit(self, world):
206 def update(self, world, engine, dt):
207 deferred_updates, self._deferred_updates = self._deferred_updates, []
208 for f, args, kw in deferred_updates:
209 f(self, world, *args, **kw)
211 def draw(self, screen):
213 self.actors.draw(screen)
215 def on_mouse_down(self, pos, button):
218 def on_mouse_up(self, pos, button):
221 def on_key_down(self, key, mod, unicode):
224 def on_key_up(self, key, mod):
227 def on_music_end(self):