X-Git-Url: https://git.ctpug.org.za/?a=blobdiff_plain;f=koperkapel%2Fscenes%2Fbase.py;h=aa30be492baa518327975e8d5a96377dc88e3935;hb=4e59ab6a38bba2eccd59cee633dc4fd391c12100;hp=58f3874f204b87a874751d593f4360a785791a70;hpb=6a8c0b31ee60408c54c9ff0d9ba46b225613f48a;p=koperkapel.git

diff --git a/koperkapel/scenes/base.py b/koperkapel/scenes/base.py
index 58f3874..aa30be4 100644
--- a/koperkapel/scenes/base.py
+++ b/koperkapel/scenes/base.py
@@ -13,11 +13,14 @@ def apply_events(f):
 
 
 class Engine:
-    """ A holder for game state. """
+    """ A holder for game state & scene management.
+        """
 
-    def __init__(self, app, scene):
+    def __init__(self, app, scene, world):
         self._app = app
         self._scene = scene
+        self._world = world
+        self._viewport = (0, 0)
 
     def _apply_events(self, events):
         if not events:
@@ -26,20 +29,27 @@ class Engine:
             ev.apply(self)
 
     def change_scene(self, scene):
-        self._scene.exit()
+        self._apply_events(self._scene.exit(self._world))
         self._scene = scene
-        self._scene.enter()
+        self._apply_events(self._scene.enter(self._world))
+
+    def change_world(self, *args, **kw):
+        self._world.apply_event(*args, **kw)
 
     def quit_game(self):
         from pgzero.game import exit
         exit()
 
+    def move_screen(self, offset):
+        self._viewport = (self._viewport[0] + offset[0],
+                          self._viewport[1] + offset[1])
+
     @apply_events
     def update(self, dt):
-        return self._scene.update(dt)
+        return self._scene.update(self._world, dt)
 
     def draw(self):
-        self._scene.draw(self._app.screen)
+        self._scene.draw(self._app.screen, self._viewport)
 
     @apply_events
     def on_mouse_down(self, pos, button):
@@ -81,12 +91,24 @@ class ChangeSceneEvent(Event):
     ENGINE_METHOD = "change_scene"
 
 
+class WorldEvent(Event):
+    """ Be a hero. Change the world. """
+
+    ENGINE_METHOD = "change_world"
+
+
 class QuitEvent(Event):
     """ Quit the game. """
 
     ENGINE_METHOD = "quit_game"
 
 
+class MoveViewportEvent(Event):
+    """ Change to a new scene. """
+
+    ENGINE_METHOD = "move_screen"
+
+
 class Actors:
     """ A list of actors. """
 
@@ -112,16 +134,16 @@ class Scene:
     def __init__(self):
         self.actors = Actors()
 
-    def enter(self):
+    def enter(self, world):
         pass
 
-    def exit(self):
+    def exit(self, world):
         pass
 
-    def update(self, dt):
+    def update(self, world, dt):
         pass
 
-    def draw(self, screen):
+    def draw(self, screen, viewport):
         screen.clear()
         self.actors.draw(screen)