animism

animism is a simple framework for procedurally generating animations with cairo and ffmpeg.

Installation

1. Install depedencies:

   On Debian/Ubuntu:

   $ sudo apt install python3-setuptools python3-cairo python3-pip
   $ sudo pip3 install progressbar2
   

2. Build the python module:

   $ python3 setup.py build
   

3. Install the python module:

   $ sudo python3 setup.py install
   

Arguments

usage: test.py [-h] [-p] [-v] [OUT_PATH]
Render an animation with cairo and ffmpeg
positional arguments:
OUT_PATH The output file path
optional arguments:
-h, --help show this help message and exit
-p, --preview Display a preview window
-v, --verbose Print verbose output to stdout

Example

Code

#!/usr/bin/env python3
import animism
import cairo
def draw_frame(frame_num, width, height):
surface = cairo.ImageSurface (cairo.FORMAT_ARGB32, width, height)
ctx = cairo.Context (surface)
# Fill background
ctx.rectangle(0, 0, width, height)
ctx.set_source_rgb(1, 1, 1)
ctx.fill ()
# Draw content
offset = frame_num * 2
l = width / 8
r = 7 * width / 8
t = height / 8
b = 7 * height / 8
ctx.move_to(l + offset, t)
ctx.line_to(r - offset, b)
ctx.move_to(l, t + offset)
ctx.line_to(r, b - offset)
ctx.move_to(r - offset, t)
ctx.line_to(l + offset, b)
ctx.move_to(l, b - offset)
ctx.line_to(r, t + offset)
ctx.set_source_rgb(0.5, 0, 1)
ctx.set_line_width(height / 64)
ctx.set_line_cap(cairo.LINE_CAP_ROUND)
ctx.stroke()
return surface
if __name__ == '__main__':
animism.run(draw_frame, 200)

Usage

$ python3 test.py
$ mplayer out.mp4

For more examples see examples/ sub-directory.