self._viewport = (self._viewport[0] + offset[0],
self._viewport[1] + offset[1])
+ def calc_offset(self, x, y):
+ """Return a position offset by the viewport"""
+ return x - self._viewport[0], y - self._viewport[1]
+
@apply_events
def update(self, dt):
- return self._scene.update(self._world.proxy(), dt)
+ return self._scene.update(self._world.proxy(), self, dt)
def draw(self):
self._scene.draw(self._app.screen, self._viewport)
ENGINE_METHOD = "move_screen"
-class Actors:
- """ A list of actors. """
+class Layer:
+ """ A single layer of actors. """
- def __init__(self):
- self._actors = []
+ def __init__(self, name):
+ self.name = name
+ self.actors = []
+
+ def __iter__(self):
+ return iter(self.actors)
+
+ def __getitem__(self, i):
+ return self.actors[i]
+
+ def __len__(self):
+ return len(self.actors)
def add(self, actor):
- self._actors.append(actor)
+ self.actors.append(actor)
return actor
+ def clear(self):
+ self.actors.clear()
+
def remove(self, actor):
- self._actors.remove(actor)
+ self.actors.remove(actor)
return actor
+
+class Actors:
+ """ Layers of actors.
+
+ Actors may be rendered in different layers. Layers with lower levels
+ are rendered lower than layers with higher ones.
+ """
+
+ def __init__(self):
+ self._ordered_layers = []
+ self._layers = {}
+ self.add_layer("default", 0)
+
+ def __getattr__(self, name):
+ return self._layers[name]
+
+ def add_layer(self, name, level):
+ layer = self._layers[name] = Layer(name)
+ self._ordered_layers.append((level, name))
+ self._ordered_layers.sort()
+ return layer
+
+ def add(self, actor, layer="default"):
+ return self._layers[layer].add(actor)
+
+ def remove(self, actor, layer="default"):
+ return self._layers[layer].remove(actor)
+
def draw(self, screen):
- for actor in self._actors:
- actor.draw() # TODO: allow an option screen to be passed in
+ for lvl, name in self._ordered_layers:
+ for actor in self._layers[name]:
+ actor.draw() # TODO: allow an option screen to be passed in
class Scene:
def exit(self, world):
pass
- def update(self, world, dt):
+ def update(self, world, engine, dt):
pass
def draw(self, screen, viewport):