Merge #274

274: Update the camera before PreRender fires r=pathunstrom a=astronouth7303

The camera isn't updated by the renderer until its `Render` handler, which is after everything has done their `PreRender` activities.

Change this to update the camera before `PreRender` fires, so that all rendering-related activities have the correct information.

Co-authored-by: Jamie Bliss <jamie@ivyleav.es>

ppb/systems/__init__.py

@@ -49,15 +49,14 @@ def __exit__(self, exc_type, exc_val, exc_tb):
     def on_idle(self, idle_event: events.Idle, signal):
         self.render_clock += idle_event.time_delta
         if self.render_clock > self.target_count:
+            self.pre_render_updates(idle_event.scene)
             signal(events.PreRender())
             signal(events.Render())
             self.render_clock = 0
 
     def on_render(self, render_event, signal):
-        self.render_background(render_event.scene)
         camera = render_event.scene.main_camera
-        camera.viewport_width, camera.viewport_height = self.resolution
-        self.pixel_ratio = camera.pixel_ratio
+        self.render_background(render_event.scene)
 
         self.old_resized_images = self.resized_images
         self.resized_images = {}
@@ -70,6 +69,11 @@ def on_render(self, render_event, signal):
             self.window.blit(resource, rectangle)
         pygame.display.update()
 
+    def pre_render_updates(self, scene):
+        camera = scene.main_camera
+        camera.viewport_width, camera.viewport_height = self.resolution
+        self.pixel_ratio = camera.pixel_ratio
+
     def render_background(self, scene):
         self.window.fill(scene.background_color)