janim

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Introduction

JAnim is a library for creating smooth animations.

Inspired by manim.

Introduction video: https://www.bilibili.com/video/BV17s42137SJ/

Examples

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Video(bilibili) | Source code

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Video(bilibili) | Source code

Highlights

Programmatic animation

class BubbleSort(Timeline):
    def construct(self):
        # define items
        heights = np.linspace(1.0, 6.0, 5)
        np.random.seed(123456)
        np.random.shuffle(heights)
        rects = [
            Rect(1, height,
                 fill_alpha=0.5)
            for height in heights
        ]

        group = Group(*rects)
        group.points.arrange(aligned_edge=DOWN)

        # do animations
        self.show(group)

        for i in range(len(heights) - 1, 0, -1):
            for j in range(i):
                rect1, rect2 = rects[j], rects[j + 1]

                self.play(
                    rect1.anim.color.set(BLUE),
                    rect2.anim.color.set(BLUE),
                    duration=0.15
                )

                if heights[j] > heights[j + 1]:
                    x1 = rect1.points.box.x
                    x2 = rect2.points.box.x

                    self.play(
                        rect1.anim.points.set_x(x2),
                        rect2.anim.points.set_x(x1),
                        duration=0.3
                    )

                    heights[[j, j + 1]] = heights[[j + 1, j]]
                    rects[j], rects[j + 1] = rect2, rect1

                self.play(
                    rect1.anim.color.set(WHITE),
                    rect2.anim.color.set(WHITE),
                    duration=0.15
                )

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Installation

JAnim runs on Python 3.12+

You may install JAnim directly via

pip install janim

to install the latest version distributed on pypi. Or, to catch up with the latest development and edit the source code, you may clone this repository via

git clone https://github.com/jkjkil4/JAnim.git
cd JAnim
pip install -e .

Additionally, there are other software dependencies to be installed:

• To generate video files, install ffmpeg.
• To use Typst, install typst.

Using JAnim

You can run the following command to see examples.

janim examples

The Tutorial Page of the Documentation provides a brief view to get you started. (Note: You can change the language of the documentation at the bottom-left corner.)

License

MIT license