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crop_svg.py
from reportlab.graphics import renderSVG
from svglib.svglib import svg2rlg
"""
The input file circle.svg contains this content:
<svg viewBox="0 0 300 300">
<circle r="100" fill="red" transform="translate(150,150)"></circle>
<rect x="-25" y="-25" width="50" height="50" fill="green" transform="translate(150,150)"></rect>
</svg>
"""
drawing = svg2rlg("circle.svg")
left, bottom, right, top = drawing.getBounds()
canvas = renderSVG.SVGCanvas()
renderSVG.draw(drawing, canvas)
clipRect = next(iter(canvas.svg.getElementsByTagName('clipPath'))).firstChild
clipRect.setAttribute('x', '66') # from
clipRect.setAttribute('y', '199') # your
clipRect.setAttribute('width', '189') # cropping
clipRect.setAttribute('height', '222') # algorithm
canvas.save('circle_cropped.svg')
"""
This creates a file circle_cropped.svg containing a clipping rectangle:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE svg
PUBLIC '-//W3C//DTD SVG 1.0//EN'
'http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd'>
<svg fill-rule="evenodd" height="400.0" preserveAspectRatio="xMinYMin meet" version="1.0" viewBox="0 0 400 400" width="400.0" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<title>...</title>
<desc>...</desc>
<clipPath id="clip">
<rect height="400.0" width="400.0" x="0" y="0"/>
</clipPath>
<g id="group" style="clip-path: url(#clip)" transform="scale(1,-1) translate(0,-400)">
<g transform="">
<g transform=" matrix(1.000000,0.000000,0.000000,-1.000000,0.000000,400.000000)">
<g transform=" matrix(1.000000,0.000000,0.000000,1.000000,150.000000,150.000000)">
<circle cx="0.0" cy="0.0" r="100.0" style="stroke: none; stroke-linecap: butt; stroke-width: 1; fill: rgb(100%,0%,0%);"/>
</g>
<g transform=" matrix(1.000000,0.000000,0.000000,1.000000,150.000000,150.000000)">
<rect height="50.0" style="stroke: none; stroke-linecap: butt; stroke-width: 1; fill: rgb(0%,50%,0%);" width="50.0" x="-25.0" y="-25.0"/>
</g>
</g>
</g>
</g>
</svg>
"""
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