comitl noun — Classical Nahuatl: [1] cooking pot, pan — a rounded or cylindrical container used to heat up meals over a fire.
Concentrically arranges randomly sized arcs into a pretty disc shape. Output is generated as a set of vector shapes in Scalable Vector Graphics (SVG) format and printed on the standard output stream.
An installation of Python 3 (any version above v3.5 will do fine). For the optional PNG output support an installation of
the cairosvg 3rd-party Python module is recommended. The module can be installed with Python's package manager:
pip --install cairosvg --user
usage: comitl.py [-V] [-h] [--circles INT] [--stroke-width FLOAT]
[--gap FLOAT] [--inner-radius FLOAT] [--hoffset FLOAT]
[--voffset FLOAT] [--color COLOR] [--random-seed INT]
[--randomize] [--separate-paths]
[--outline-mode {both,outside,inside,none}]
[--background-color COLOR] [--disc-color COLOR]
[--animation-mode {random,bidirectional,cascade-in,cascade-out}]
[--animation-duration FLOAT] [--animation-offset FLOAT]
[-o FILENAME] [--output-size INT]
Startup:
-V, --version show version number and exit
-h, --help show this help message and exit
Algorithm:
--circles INT number of concentric arc elements to generate inside
the disc [:21]
--stroke-width FLOAT width of the generated strokes [:6]
--gap FLOAT distance between the generated strokes
--inner-radius FLOAT setup inner disc radius to create an annular shape
--hoffset FLOAT shift the whole disc horizontally [:0.0]
--voffset FLOAT shift the whole disc vertically [:0.0]
--color COLOR SVG compliant color specification or identifier
[:black]
--random-seed INT fixed initialization of the random number generator
for predictable results
--randomize generate truly random disc layouts; other algorithm
values provided via command line parameters are
utilized as limits
Miscellaneous:
--separate-paths generate separate <path> elements for each arc;
automatically implied when animation support is
enabled
--outline-mode {both,outside,inside,none}
generate bounding outline circles [:both]
--background-color COLOR
SVG compliant color specification or identifier; adds
a background <rect> to the SVG output
--disc-color COLOR SVG compliant color specification or identifier; fills
the background of the generated disc by adding an
extra <circle> element
--animation-mode {random,bidirectional,cascade-in,cascade-out}
enables SVG <animateTransform> support
--animation-duration FLOAT
defines base duration of one full 360° arc rotation
(in seconds); negative inputs switch to counter-
clockwise base direction [:6.0]
--animation-offset FLOAT
offset the animation (in seconds) to support rendering
to frame sequences for frame based animation formats.
[:0]
Output:
-o FILENAME, --output FILENAME
optionally rasterize the generated vector paths and
write the result into a PNG file (requires the
`svgcairo' Python module)
--output-size INT force pixel width and height of the raster image; if
omitted the generated SVG viewbox dimensions are used
# Generate a SVG file
./comitl.py --circles=10 --color=green > output.svg
# Rasterize directly into a PNG file (requires "cairosvg")
./comitl.py --circles=10 --disc-color=black --color="#fff" -o output.png# Preview output with ImageMagick's "convert" and Preview.app (Mac OS X)
./comitl.py --randomise | convert svg:- png:- | open -f -a Preview.app
# Preview output with ImageMagick's "convert" and "display" (Linux/BSD/etc.)
./comitl.py --randomise | convert svg:- png:- | displayCreating frame-based animations (for use in VFX applications like BlackMagic Fusion, After Effects, etc.) is
possible by utilizing the --animation-offset parameter to manually advance the SVG animation, f.ex. a quick bash script
like this would create a 10s clip in Apple ProRes 4444 format with the help of ffmpeg:
#!/bin/bash
if mkdir -p './output_frames'; then
framerate=`bc -l <<< "30000/1001"` # NTSC
for frame in {0..299}; do
offset=`bc -l <<< "${frame}/${framerate}"`
filename=`printf 'frame%04d.png' ${frame}`
./comitl.py \
--random-seed=12345 \
--animation-mode=random \
--animation-offset="${offset}" \
--color=#334455 \
--background-color=#ddeeff \
--output-size=480 \
-o "./output_frames/${filename}"
done
ffmpeg \
-f image2 \
-framerate "${framerate}" \
-i "./output_frames/frame%04d.png" \
-c:v prores_ks -profile:v 4 \
"./output_frames/output.mov"
fi| 1.7 | 30-May-2020 |
|
| 1.6 | 22-May-2020 |
|
| 1.5 | 22-May-2020 |
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| 1.4 | 20-May-2020 |
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| 1.3 | 19-May-2020 |
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| 1.2 | 18-May-2020 |
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| 1.1 | 18-May-2020 | Initial public source code release |