deeplook / svglib

Read SVG files and convert them to other formats.
GNU Lesser General Public License v3.0
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svg2png distortions #283

Closed galacticue06 closed 3 years ago

galacticue06 commented 3 years ago

I have been working on a chess engine and I had to use python-chess's SVG generator. After I save the SVG, I wanted to load it into Tkinter so I converted the SVG file to PNG. However, the generated PNG file has some distortions...

I'm guessing that the issue I'm facing looks similar to https://github.com/deeplook/svglib/issues/104

(I checked python-chess's SVG and it looks normal so the distortions are caused by either svglib or reportlab)

Here is a the image:

cb

That's what the SVG file looks like:

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13.5,7.5 C 14.5,6.5 16.5,10 16.5,10 L 18.5,10 C 18.5,10 19.28,8.008 21,7 C 22,7 22,10 22,10" style="fill:#ffffff; stroke:#000000;" /><path d="M 9.5 25.5 A 0.5 0.5 0 1 1 8.5,25.5 A 0.5 0.5 0 1 1 9.5 25.5 z" style="fill:#000000; stroke:#000000;" /><path d="M 15 15.5 A 0.5 1.5 0 1 1 14,15.5 A 0.5 1.5 0 1 1 15 15.5 z" transform="matrix(0.866,0.5,-0.5,0.866,9.693,-5.173)" style="fill:#000000; stroke:#000000;" /></g><g id="white-bishop" class="white bishop" fill="none" fill-rule="evenodd" stroke="#000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><g fill="#fff" stroke-linecap="butt"><path d="M9 36c3.39-.97 10.11.43 13.5-2 3.39 2.43 10.11 1.03 13.5 2 0 0 1.65.54 3 2-.68.97-1.65.99-3 .5-3.39-.97-10.11.46-13.5-1-3.39 1.46-10.11.03-13.5 1-1.354.49-2.323.47-3-.5 1.354-1.94 3-2 3-2zM15 32c2.5 2.5 12.5 2.5 15 0 .5-1.5 0-2 0-2 0-2.5-2.5-4-2.5-4 5.5-1.5 6-11.5-5-15.5-11 4-10.5 14-5 15.5 0 0-2.5 1.5-2.5 4 0 0-.5.5 0 2zM25 8a2.5 2.5 0 1 1-5 0 2.5 2.5 0 1 1 5 0z" /></g><path 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claudep commented 3 years ago

Is the PDF output OK? If that's the case, it's probably a reportlab issue. Reportlab recently offered an alternate bitmap renderer, would be worth the try, see https://pairlist2.pair.net/pipermail/reportlab-users/2021-February/012037.html

galacticue06 commented 3 years ago

PDF output is ok.

Note: Each time the png is generated, distortion creates a different pattern. This is kinda strange tho...

claudep commented 3 years ago

Probably some thread-safety issue.

I will however close the ticket, as I don't think svglib can do anything here, sorry.