SVGMobject can’t have a Write animation applied to it when using OpenGL as the backend

[chunribu]

Description of bug / unexpected behavior

SVGMobject can’t have a Write animation applied to it when using OpenGL as the backend.

Expected behavior

Like the animation Create on svg, with no error.

How to reproduce the issue

Code for reproducing the problem

%%manim -v WARNING --disable_caching --renderer=opengl --write_to_movie T

class T(Scene):
    def construct(self):
        svg = SVGMobject('TEST.svg')
        self.play(Write(svg))

Logs

Terminal output

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
Cell In[2], line 1
----> 1 get_ipython().run_cell_magic('manim', '-v WARNING --disable_caching --renderer=opengl --write_to_movie T', "\nclass T(Scene):\n    def construct(self):\n        svg = SVGMobject('TEST.svg')\n        self.play(Write(svg))\n")

File ~/miniconda3/envs/manim/lib/python3.11/site-packages/IPython/core/interactiveshell.py:2478, in InteractiveShell.run_cell_magic(self, magic_name, line, cell)
   2476 with self.builtin_trap:
   2477     args = (magic_arg_s, cell)
-> 2478     result = fn(*args, **kwargs)
   2480 # The code below prevents the output from being displayed
   2481 # when using magics with decodator @output_can_be_silenced
   2482 # when the last Python token in the expression is a ';'.
   2483 if getattr(fn, magic.MAGIC_OUTPUT_CAN_BE_SILENCED, False):

File ~/miniconda3/envs/manim/lib/python3.11/site-packages/manim/utils/ipython_magic.py:141, in ManimMagic.manim(self, line, cell, local_ns)
    139     SceneClass = local_ns[config["scene_names"][0]]
    140     scene = SceneClass(renderer=renderer)
--> 141     scene.render()
    142 finally:
    143     # Shader cache becomes invalid as the context is destroyed
    144     shader_program_cache.clear()

File ~/miniconda3/envs/manim/lib/python3.11/site-packages/manim/scene/scene.py:223, in Scene.render(self, preview)
    221 self.setup()
    222 try:
--> 223     self.construct()
    224 except EndSceneEarlyException:
    225     pass

File <string>:5, in construct(self)

File ~/miniconda3/envs/manim/lib/python3.11/site-packages/manim/scene/scene.py:1082, in Scene.play(self, subcaption, subcaption_duration, subcaption_offset, *args, **kwargs)
   1079     return
   1081 start_time = self.renderer.time
-> 1082 self.renderer.play(self, *args, **kwargs)
   1083 run_time = self.renderer.time - start_time
   1084 if subcaption:

File ~/miniconda3/envs/manim/lib/python3.11/site-packages/manim/utils/caching.py:65, in handle_caching_play.<locals>.wrapper(self, scene, *args, **kwargs)
     60 self.file_writer.add_partial_movie_file(hash_play)
     61 logger.debug(
     62     "List of the first few animation hashes of the scene: %(h)s",
     63     {"h": str(self.animations_hashes[:5])},
     64 )
---> 65 func(self, scene, *args, **kwargs)

File ~/miniconda3/envs/manim/lib/python3.11/site-packages/manim/renderer/opengl_renderer.py:424, in OpenGLRenderer.play(self, scene, *args, **kwargs)
    421 self.file_writer.begin_animation(not self.skip_animations)
    423 scene.compile_animation_data(*args, **kwargs)
--> 424 scene.begin_animations()
    425 if scene.is_current_animation_frozen_frame():
    426     self.update_frame(scene)

File ~/miniconda3/envs/manim/lib/python3.11/site-packages/manim/scene/scene.py:1210, in Scene.begin_animations(self)
   1208 for animation in self.animations:
   1209     animation._setup_scene(self)
-> 1210     animation.begin()
   1212 if config.renderer == RendererType.CAIRO:
   1213     # Paint all non-moving objects onto the screen, so they don't
   1214     # have to be rendered every frame
   1215     (
   1216         self.moving_mobjects,
   1217         self.static_mobjects,
   1218     ) = self.get_moving_and_static_mobjects(self.animations)

File ~/miniconda3/envs/manim/lib/python3.11/site-packages/manim/animation/creation.py:364, in Write.begin(self)
    362 if self.reverse:
    363     self.reverse_submobjects()
--> 364 super().begin()

File ~/miniconda3/envs/manim/lib/python3.11/site-packages/manim/animation/creation.py:253, in DrawBorderThenFill.begin(self)
    251 def begin(self) -> None:
    252     self.outline = self.get_outline()
--> 253     super().begin()

File ~/miniconda3/envs/manim/lib/python3.11/site-packages/manim/animation/animation.py:203, in Animation.begin(self)
    195 if self.suspend_mobject_updating:
    196     # All calls to self.mobject's internal updaters
    197     # during the animation, either from this Animation
   (...)
    200     # the internal updaters of self.starting_mobject,
    201     # or any others among self.get_all_mobjects()
    202     self.mobject.suspend_updating()
--> 203 self.interpolate(0)

File ~/miniconda3/envs/manim/lib/python3.11/site-packages/manim/animation/animation.py:323, in Animation.interpolate(self, alpha)
    312 def interpolate(self, alpha: float) -> None:
    313     """Set the animation progress.
    314 
    315     This method gets called for every frame during an animation.
   (...)
    321         the end.
    322     """
--> 323     self.interpolate_mobject(alpha)

File ~/miniconda3/envs/manim/lib/python3.11/site-packages/manim/animation/animation.py:338, in Animation.interpolate_mobject(self, alpha)
    336 for i, mobs in enumerate(families):
    337     sub_alpha = self.get_sub_alpha(alpha, i, len(families))
--> 338     self.interpolate_submobject(*mobs, sub_alpha)

File ~/miniconda3/envs/manim/lib/python3.11/site-packages/manim/animation/creation.py:284, in DrawBorderThenFill.interpolate_submobject(self, submobject, starting_submobject, outline, alpha)
    282 if index == 0:
    283     submobject.pointwise_become_partial(outline, 0, subalpha)
--> 284     submobject.match_style(outline)
    285 else:
    286     submobject.interpolate(outline, starting_submobject, subalpha)

File ~/miniconda3/envs/manim/lib/python3.11/site-packages/manim/mobject/opengl/opengl_vectorized_mobject.py:313, in OpenGLVMobject.match_style(self, vmobject, recurse)
    311 vmobject_style = vmobject.get_style()
    312 if config.renderer == RendererType.OPENGL:
--> 313     vmobject_style["stroke_width"] = vmobject_style["stroke_width"][0][0]
    314 self.set_style(**vmobject_style, recurse=False)
    315 if recurse:
    316     # Does its best to match up submobject lists, and
    317     # match styles accordingly

TypeError: 'NoneType' object is not subscriptable

System specifications

System Details

• OS: WSL2 Ubuntu 22.04.1 LTS
• Python version: 3.11