Getting Bounding Box of entire SVG file

[DoubleF3lix]

I've loaded in an SVG file using this:

from svgpathtools import svg2paths
paths, attr = svg2paths("testing.svg")

And I see that I have a list of paths, but how can I calculate the overall bounding box from these? The only source of data I see that matches loading in the SVG into a browser and using svg_dom.getBBox() is paths[-1][1] has the correct width if we subtract the y value.

[mathandy]

Does Path(*[seg for path in paths for seg in path]).bbox() work?

[DoubleF3lix]

Sadly not. This outputs (0.0, 643.0, -633.0, 1195.0) while document.getElementById("bbox").getBBox() gives me { x: 0.0714000016450882, y: 1.000000238418579, width: 28.39109992980957, height: 16.946998596191406 }

[mathandy]

Sounds like a bug. Please attach an SVG example if you can.

[DoubleF3lix]

Here you go! (Sorry it's a little large, but it's actually why I need the bounding box so I can crop it properly)

[mathandy]

The issue is caused by svg2paths ignoring transforms. You can use Document to respect transforms.

from svgpathtools import Document, Path, polygon

doc = Document('testing.svg')

xmin, xmax, ymin, ymax = Path(*[seg for path in doc.paths() for seg in path]).bbox()
box = polygon(xmin+ymin*1j, xmax+ymin*1j, xmax+ymax*1j, xmin+ymax*1j)

doc.add_path(box, attribs={'stroke':"red", 'stroke-width':'0.1', 'fill': 'none'})

doc.save('testing2.svg')

# fix for issue #182
with open('testing2.svg') as f:
    txt = f.read().replace('<path', '<svg:path')
with open('testing2.svg', 'w') as f:
    f.write(txt)

Result: (Note that I believe the bounding box is correct and that the bits that appear outside the box are caused by the "thickness" of the paths. As this package was designed for scientific analysis, bounding boxes are based on the 1D location of paths, ignoring how thick they look when rendered. That said, it'd be a nice feature to have a built-in workaround for this.)

[DoubleF3lix]

Thank you so much! Not related to the issue, but would you by any chance how to convert this new bounding box data to the height, width, and viewbox portions of the SVG to effectively "crop" it?

EDIT: Nevermind, I found I can remove the mm from the height and width parameters, and then just set viewbox to 0 0 height width