Updaters fix (#838)

* Fix --use_js_renderer and create JsRenderer

* In need of an abstract method for saving static frame data

* Barebones js renderer with no effect

* Restore simple JS functionality

* Preparing to send frame data to JS

* Restore progress after merge

* Restore ability to play animations

* Properly set wait duration

* Pass animation_offset to JS

* Allow for playing a range of animations

* Update RPCs

* Play scene on modification

* Send correct duration to JS on animation finish

* Copy keyframes prior to updating

* Play scene on update

* Allow for image previews

* Don't attempt to serialize ValueTracker

* Cache previously used scene

* Add ImageMobject functionality

* Clear scene caching when regenerating keyframe data

* Remove extraneous changes

* Update for doctests

* Format generated files

* Add http server for media

* Update moving_mobjects in Scene.add()

* Remove unused function

* black

* Add test

Author: eulertour

manim/scene/scene.py

@@ -319,6 +319,11 @@ def add(self, *mobjects):
         mobjects = [*mobjects, *self.foreground_mobjects]
         self.restructure_mobjects(to_remove=mobjects)
         self.mobjects += mobjects
+        if self.moving_mobjects:
+            self.restructure_mobjects(
+                to_remove=mobjects, mobject_list_name="moving_mobjects"
+            )
+            self.moving_mobjects += mobjects
         return self
 
     def add_mobjects_from_animations(self, animations):

tests/control_data/graphical_units_data/updaters/UpdateSceneDuringAnimationTest.npz

@@ -24,6 +24,15 @@ def construct(self):
         line_2.rotate(theta.get_value(), about_point=ORIGIN)
 
 
+class UpdateSceneDuringAnimationTest(Scene):
+    def construct(self):
+        def f(mob):
+            self.add(Square())
+
+        s = Circle().add_updater(f)
+        self.play(ShowCreation(s))
+
+
 MODULE_NAME = "updaters"