SVG path data transformation toolkit

A tool and a library for SVG path data transformations. Currently it supports a translation and a scaling.

Usage

As a Python library

import svg_path_transform as S
path = S.parse_path("m 2 2 l 2 2")
path = S.translate_and_scale(path, s=(1, 3))
path = S.translate_and_scale(path, t=(3, 4))
path = S.morph(path, lambda p: [p[0] * 2, p[1] * 2])
print(S.path_to_string(path, sfig=4))

As a command line tool

svg_path_transform --dx 100 --dy 100 <<< "m 2 2 l 2 2"

Command line parameters

usage: svg_path_transform [-h] [--dx N] [--dy N] [--sx N] [--sy N] [--sfig N] [--ndig N] [--seg N] [--pretty-print] [-v]

SVG path data transformer

options:
  -h, --help      show this help message and exit
  --dx N          translate x by N
  --dy N          translate y by N
  --sx N          scale x by N
  --sy N          scale y by N
  --sfig N        round to N significant figures
  --ndig N        round to N decimal places
  --seg N         convert to straight line segments with a given max distance
  --pretty-print  pretty print the input path and exit
  -v, --version   show program's version number and exit

Hint: a bash function to transform an SVG with a single path inside

function svg_transform() {
    selector='//_:path[1]/@d'
    input=$(</dev/stdin)
    old_path="$(xmlstarlet sel -t -v "$selector" <<< "$input")"
    [[ $? -ne 0 ]] && echo "could not parse SVG" && return 1
    new_path="$(svg_path_transform "$@" <<< "$old_path")"
    [[ $? -ne 0 ]] && echo "could not parse path" && return 1
    xmlstarlet ed -u "$selector" -v "$new_path" <<< "$input"
    [[ $? -ne 0 ]] && echo "could not update SVG" && return 1
    return 0
}

svg_transform --sx 2 --sy 2 < intput.svg > output.svg

Installation

pip install svg_path_transform