pysvglib

A Python-based SVG graphics library for programmatically generating SVG diagrams from basic shapes.

Example

Import the library

import svg

Create a "root" SVG object and define the view box. Keyword arguments define other parameters that will be passed to the fundamental svg node.

root = svg.RootSvg((-25, -25, 50, 50), width='50%', height='50%')

Add style definitions that will affect the entire graphic. Keyword arguments become css style parameters.

root.add_style(svg.Style('.glass', fill='#bbf7f4', fill_opacity=0.5))
root.add_style(svg.Style('.outline', stroke='black'))

Add child nodes and groups of nodes. These can be rectangles, circles, complex paths, etc.

root.append_child(svg.Rectangle(p1=(-10, -15), p2=(30, 85), fill='#cccccc', stroke='none'))

mygroup = svg.Group(id='mygroup')
mygroup.append_child(svg.Rectangle(center=(0, 0), width=5, height=10).append_class('glass'))
mygroup.append_child(svg.Rectangle(center=(3, 2), width=10, height=5).append_class('glass'))
root.append_child(mygroup)

path = svg.Path((6.7, -10), stroke_width=0.2, fill='none')
path.line_to((0, 20), relative=True).h_line(-2, relative=True) \
    .arc_to((12.9, 12.9), 0, False, True, (0, -20), relative=True) \
    .close()
path.append_class('outline')
root.append_child(path)

Apply transformations to nodes and groups.

mygroup.rotate(37, center=(4, 7))
mygroup.translate((2, -4))
path.skew_x(10)

Output the SVG markup as a string.

print(root)

Which results in:

<svg height="100%" viewBox="-25 -25 50 50" width="100%" xmlns="http://www.w3.org/2000/svg">
  <style>
    .glass {
      fill: #bbf7f4;
      fill-opacity: 0.5;
    }
  </style>
  <g id="mygroup">
    <rect fill="#cccccc" height="100" stroke="none" width="100" x="-50" y="-50"/>
    <rect class="glass" height="10" width="5" x="-2.5" y="-5.0"/>
  </g>
  <path d="M 6.7 -10 l 0 20 h -2 a 12.9 12.9 0 0 1 0 -20 Z" fill="none" stroke-width="0.2"/>
</svg>

...or output it to a file:

root.write('my_picture.svg')

which results in:

Development

Use pipenv for local environment management. After cloning the repository:

$ cd <project-repo>
$ pipenv install -e .[dev]
$ pipenv shell

Run tests by just executing pytest at the root of the local virtual environment. Likewise enforce code style by running pycodestyle . from the root of the local virtual environment.

To package and release, from within the virtual environment:

$ python setup.py sdist bdist_wheel

See also this page.