QSvgWidget not displaying file completely

wavelike

Hello everyone,

I have an SVG file which I want to show in an application window, and for that I am using (trying to) QSvgWidget. I get to see the graphics, but not all of it, as the legend, title and axis labels and markers are all missing.
I am showing both images - the original with all information present and then what is displayed by a QSvgWidget.
Any idea how to solve this problem? At the moment I am not looking at moving away from SVG, so I am primarily interested in fixing this problem, if it's possible.
Thanks.
(The image is generated by the Cairo package in R, if that is of any importance, though I have a feeling that has nothing to do with the problem)

_plotViewer = new QSvgWidget(this);
_plotViewer->load(graphicsFile);

where graphicsFile is just a QString with the SVG filename.

mrjj

Hi
Qt only supports a subset of SVG. called mini or something like that.
It might be its simply not support if it uses something advanced.

Bonnie

@mrjj said in QSvgWidget not displaying file completely:

called mini or something like that.

You make me curious. So I looked into the doc. It's called Tiny :)

Qt supports the static features of SVG 1.2 Tiny. ECMA scripts and DOM manipulation are currently not supported.

wavelike

Well, that's disappointing,.. I wasn't expecting that. I guess I will have to abandon the idea of using SVG after all.

Thanks to both of you.

mrjj

@wavelike
Yeah it kinda sucks since it just looks like some text etc so I would have guessed it was covered by the Tiny specs.

Could i get the image to have a look at?
(dont upload here it's broken)

wavelike

@mrjj Sure, just tell me how to send it to you

mrjj

@wavelike
You can use
https://wetransfer.com/
use the ... button
alt text
to send as link

and paste link here.

all free. no registration needed.

wavelike

Here it is
https://we.tl/t-DBVDCAfDvm

mrjj

@wavelike
Thank you. that was fast :)

mrjj

Hi
It seems the texts are not real text objects but some sort of path pr letter. (maybe the glyphs)

Maybe there is some options in Cairo package that allows to use text object instead ?

Seems other noticed this
https://stackoverflow.com/questions/18258654/r-inkscape-text-labels-in-svg-graphics-exported-from-r-did-not-recognized-as
and https://cran.r-project.org/web/packages/svglite/index.html
can be used to export as text but not sure it fit rest of your use case :)

wavelike

@mrjj Yes, that surprised me too, as I wanted to look at the part of the file where the legend/title/other text is located and the search came back empty. My knowledge of graphics files, including SVG, is next to non-existant, so I wasn't exactly shocked. Furthermore, just thinking about something called vector graphics, the ignorant me imagines that the file does not contain letters but relative positions of pixels or whatever... I'd better shut up, because I don't know what I am talking about haha.

wavelike

@mrjj Ok, I will have a look. I have already produced PNG files and will be working with them, unless I find a solution that will give me SVG in Qt without much extra work.

Thank you a lot, either way. :)

mrjj

@wavelike
Hi
Well a hires PNG should also work nicely.
Just for info. SVG is vector which means its not pixels but drawing functions so it can scale
without becoming pixellated. However, Cairo seems to not excatly insert the letters as letter but some form of another drawing thing that Qt cant draw.

SVG would look better if you were to print it on really hires printer or in A3 but in other cases, the PNG will look just as fine if you make sure its not lowres.

wavelike

Just in case somebody stumbles upon this thread and also tried to use the Cairo SVG package with QSvgWidget - forget about Cairo as nice as it sometimes could be, as there is an R package ggiraph with a simple function dsvg(filename,...) and it produces a SVG file that is fully supported by Qt.