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ivan lavosky

[By Design] Stroke flattened if exported to SVG

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I found that certain combinations of stroke's cap, join & align resulting in flattened stroke if exported to SVG. Oddly, it's only happened in closed shape (stroke that its start meets with its end).
I exported to SVG using AD and opened the SVG using AI. 

OS: Windows 10 Home
Affinity Designer:
Adobe Illustrator: 2021 (25.0 for 64 bit) 

I have made the list of the combinations that you can try for yourself to reproduce the issue. 
Step to reproduce the issue:

- Open the file I provided and export it to SVG (for export)

Flattened Stroke Test.afdesign

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Hi ivan lavosky,

Thanks for the detailed file, however this is unfortunately 'by design' and is due to the limitations of the SVG format not supporting a stroke's alignment setting. Therefore to ensure your file retains its look we expand this to be a closed shape that looks the same when viewed.

With that said there are some inaccuracies to note with your file:

  • Open curves can never be set to Align Inner/Outer so will always be Align Centre (despite what may have been selected) so these will always export as strokes.
  • Number 6 and Number 9 both have their closed Shapes set (incorrectly based on your comments) to Align Centre so that would explain why those are 'green' and not getting expanded.
  • Number 15 is also getting expanded on output, yet is incorrectly set to green.

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Hello Sean P,


Thanks for taking a look on my file & pointing out my incorrect comments. 
I also didn't know about that SVG format limitation. I thought it was potentially a bug.

So my best bet is leaving the "align" setting to "center".

Thanks for your clear explaination


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