====================
Include Manim videos
====================
In this section, we assume familiarity with `Manim
`_, the library to create mathematical
animations. Visit the `docs `_
otherwise!
Include a full video
====================
Including Manim videos is relatively straightforward in Slipshow, since Manim
outputs videos, and videos can be included in a Slipshow presentation.
Suppose for instance that you have manim file like this:
.. code-block:: python
from manim import *
class AnimatedSquareToCircle(Scene):
def construct(self):
circle = Circle() # create a circle
square = Square() # create a square
self.play(Create(square)) # show the square on screen
self.play(square.animate.rotate(PI / 4)) # rotate the square
self.play(Transform(square, circle)) # transform the square into a circle
self.play(
square.animate.set_fill(PINK, opacity=0.5)
) # color the circle on screen
In order to turn that into a video, you can do
.. code-block::
$ manim -hm main.py AnimatedSquareToCircle
A video file will be generated in
``media/videos/main/720p30/AnimatedSquareToCircle.mp4`` (the path may depend on
the resolution). You can include this file in a Slipshow presentation simply
with ````, and play it with the ``play-media`` action. For
instance:
.. code-block::
{#square-to-circle width=100%}
{focus=square-to-circle}
{play-media=square-to-circle}
Having pauses in the middle of a video
======================================
You might want to program pauses in the video, to account for your speech, or
questions from the audience. You can do so using the `"section" mechanism
`_
from Manim.
If you include sections, in your animation, Manim will render one file per
section. For instance, if you update the file above to the following:
.. code-block:: python
from manim import *
class AnimatedSquareToCircle(Scene):
def construct(self):
circle = Circle() # create a circle
square = Square() # create a square
self.next_section("square")
self.play(Create(square)) # show the square on screen
self.play(square.animate.rotate(PI / 4)) # rotate the square
self.next_section("transformation")
self.play(Transform(square, circle)) # transform the square into a circle
self.next_section("circle")
self.play(
square.animate.set_fill(PINK, opacity=0.5)
) # color the circle on screen
And compile it with:
.. code-block::
$ manim --save_sections -hm main.py AnimatedSquareToCircle
Then, Manim will generate one file per section, using the (optional) name you
gave to the sections:
.. code-block::
$ ls media/videos/main/720p30/sections
AnimatedSquareToCircle_0000_square.mp4
AnimatedSquareToCircle_0001_transformation.mp4
AnimatedSquareToCircle_0002_circle.mp4
AnimatedSquareToCircle.json
So, in only remains to add separate files, and make them look like they are a
single video. We'll simply put them in a carousel.
.. code-block::
{carousel .carousel-fixed-size #c}
> {#v1 width=100%}
>
> {#v2 width=100%}
>
> {#v3 width=100%}
{play-media=v1}
{change-page=c play-media=v2}
{change-page=c play-media=v3}
.. slipshow-example::
:visible: presentation
{focus=c}
{play-media=v1}
{change-page=c play-media=v2}
{change-page=c play-media=v3}