glaxnimate

Python Glaxnimate

Python bindings for Glaxnimate.

Allows to create and modify vector animations. With support for Lottie, SVG, and other formats.

See the documentation page for more details.

Examples

Convert animated SVG to Lottie

import glaxnimate

# Set up environment
with glaxnimate.environment.Headless():
    # Create a document object
    document = glaxnimate.model.Document("")

    # Load an animated SVG
    with open("MyFile.svg", "rb") as input_file:
        glaxnimate.io.registry.from_extension("svg").load(document, input_file.read())

    # ...

    # Write to Lottie
    with open("MyFile.json", "wb") as output_file:
        output_file.write(glaxnimate.io.registry.from_extension("json").save(document))

Render Lottie to gif

from PIL import Image
from PIL import features
import glaxnimate


def png_gif_prepare(image):
    """
    Converts the frame image from RGB to indexed, preserving transparency
    """
    if image.mode not in ["RGBA", "RGBa"]:
        image = image.convert("RGBA")
    alpha = image.getchannel("A")
    image = image.convert("RGB").convert('P', palette=Image.ADAPTIVE, colors=255)
    mask = Image.eval(alpha, lambda a: 255 if a <= 128 else 0)
    image.paste(255, mask=mask)
    return image


def save_gif(document, file, skip_frames=1):
    start = int(document.main.animation.first_frame)
    end = int(document.main.animation.last_frame)

    # Get all frames as PIL images
    frames = []
    for i in range(start, end+1, skip_frames):
        frames.append(png_gif_prepare(document.render_image(i)))

    # Save as animation
    duration = int(round(1000 / document.main.fps * skip_frames / 10)) * 10
    frames[0].save(
        file,
        format='GIF',
        append_images=frames[1:],
        save_all=True,
        duration=duration,
        loop=0,
        transparency=255,
        disposal=2,
    )

# Initialize environment
with glaxnimate.environment.Headless():

    document = glaxnimate.model.Document("")

    # Load the lottie JSON
    with open("MyFile.json", "rb") as input_file:
        glaxnimate.io.registry.from_extension("json").load(document, input_file.read())

    # Save as GIF
    with open("MyFile.gif", "rb") as output_file:
        save_gif(document, output_file)

Create animations from code

import glaxnimate

with glaxnimate.environment.Headless():
    # Create an empty document
    document = glaxnimate.model.Document("")

    # Add a layer
    layer = document.main.add_shape("Layer")

    # The fill will be applied to all following shapes in the same group / layer
    fill = layer.add_shape("Fill")
    fill.color.value = "#ff0000"

    # A simple circle moving left and right
    ellipse = layer.add_shape("Ellipse")
    radius = 64
    ellipse.position.set_keyframe(0, glaxnimate.utils.Point(radius, document.size.height / 2))
    ellipse.position.set_keyframe(90, glaxnimate.utils.Point(document.size.width-radius, document.size.height / 2))
    ellipse.position.set_keyframe(180, glaxnimate.utils.Point(radius, document.size.height / 2))
    ellipse.size.value = glaxnimate.utils.Size(radius, radius)

    # Export it
    with open("MyFile.svg", "wb") as output_file:
        output_file.write(glaxnimate.io.registry.from_extension("svg").save(document))

Dependencies

This module depends on the following system libraries

• Qt5 (widgets, xml)
• potrace
• libav / ffmpeg
• libarchive

To install them on Ubuntu and similar:

apt install libqt5widgets5 libqt5xml5 potrace ffmpeg libarchive13