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Issues with E-road shields (Tabliczka set)

Latest comment: 3 months ago12 comments5 people in discussion

Tracked in Phabricator
Task T370044

The text of the E-road shields that use the "Tabliczka" format have suddenly become offset to the left: they used to be centred until recently. I wonder what is causing the error, and I also ask who has time to correct the alignment of all 263 shields in the set? (I am currently busy on other parts of Wikipedia) Best, --Minoa (talk) 02:51, 30 July 2024 (UTC)Reply

@Minoa: Apparently the SVG renderer doesn't position non-uniformly scaled text correctly. I.e. there is a transform="scale(0.907522,1.101902)" attribute in the <text> node and removing it makes the text render in the same location as in Inkscape or in the browser.

I don't remember whether this is a known bug and I don't see an elegant way to fix this. If we simply move the text to the right, it'll be too far to the right once the bug is fixed. If we do remove the transform and adjust the position, the characters will have a less narrow shape. Converting the text to paths would solve the rendering issue, but it's just not elegant. TilmannR (talk) 15:41, 30 July 2024 (UTC)Reply

The svg code could be greatly shortened to basic rectangle and text elements, avoiding the sodipodi and other declarations and complications that Inkscape introduced. But with 263 member files in this category, avoiding the rendering problem would be a grueling task. I'd be willing to do a prototype/model file for someone with more time and patience, though I'm not sure which font I should use in place of the disfavored fond-family, Arial. You might also seek advice at WP:SVG help] at en.WP. RCraig09 (talk) 16:47, 30 July 2024 (UTC)Reply

For the record, I tried to reduce the size of the file and successfully validate the SVG code at File:Tabliczka E75.svg and File:Tabliczka E951.svg, but it appears that rsvg is scaling the text towards the left despite the text-anchor="middle" instruction. While it may be tempting to suggest modifying the view-box to have (0,0) at the middle, such a workaround is not possible for something like File:Integral image application example.svg. --Minoa (talk) 08:22, 31 July 2024 (UTC)Reply

I believe TilmannR has diagnosed the issue. I believe the mechanism is as follows. RSVG is asked to center the text. It calculates the width of the text without scaling. Say that is 400 pixels. It then takes 1/2 that value to compute the starting point; the starting point is then 200 pixels left of the anchor point. Then it paints the text, but the scaling is applied while painting. If the scale factor is 0.9, then the text will be 360 pixels wide. The text will appear shifted to the left by 20 pixels. (If the scaling is 1.1, then the text would appear shifted to the right.)

It is a bug in the renderer, so I would ask WMF to fix the renderer rather than tweak the SVG. Fix stuff where it is broken. One check would be whether this bug is present in the most recent version of RSVG.

If the SVG is worked around, I suspect using an x scale factor of 1.0 would avoid the bug; the y scale factor could be different from unity.

Glrx (talk) 14:58, 31 July 2024 (UTC)Reply

x scale > 1, y scale = 1 does shift to the right. x scale = 1, y scale > 1 does not do as I expect (shifts to the left!).

Glrx (talk) 15:32, 31 July 2024 (UTC)Reply

I wish to ask if there is already a Phabricator report for this issue? --Minoa (talk) 15:36, 31 July 2024 (UTC)Reply

User:JoKalliauer diagnosed this problem in Phab:T370044. Glrx (talk) 17:14, 31 July 2024 (UTC)Reply

See also: https://gitlab.gnome.org/GNOME/librsvg/-/issues/1109 (titled: transform of Text in Pattern with text-anchor="middle" not centered). I hope that they will correct the issue soon because I have a plan to compact and validate the SVGs in the Tabliczka set. --Minoa (talk) 09:24, 4 August 2024 (UTC)Reply

For the record, I have marked this topic as active (using {{DNAU}}) until the issue is fixed. The impact of the bug is substantial, because my plan to upload optimised SVG E-road shields has been postponed until I know for sure how the Wikimedia Commons will render them. --Minoa (talk) 07:41, 24 August 2024 (UTC)Reply

@Minoa: Support for condensed fonts is mixed, but I got a reasonable result with

  <text
     style="font-size:84px;font-weight:bold;font-stretch:condensed;text-align:center;text-anchor:middle;fill:#ffffff;font-family:sans-serif"
     x="105"
     y="95"><tspan>E002</tspan></text>

See File:Test.svg 2024-08-24 15:45

Glrx (talk) 15:56, 24 August 2024 (UTC)Reply

Note: Similar issues have been reported on

cmɢʟee ⋅τaʟκ 00:59, 31 July 2024 (UTC)Reply

Rendering of SVG pattern

Latest comment: 2 months ago1 comment1 person in discussion

Tracked in Phabricator
Task T20463

Below you see two sizes of the same image. It contains a striped pattern. But it is not rendered, when the width is 521px or less.
For File:SVG pattern striped.svg it is 90px or less. Any idea why that is the case, and if it could be fixed?

Watchduck (quack) 10:20, 12 September 2024 (UTC)Reply

The world is flat

Latest comment: 1 month ago1 comment1 person in discussion

I found this forex flat time chart. I think it can be expanded but left flat. I have been using https://market24hclock.com/ for bitcoin trading but the time world is better flat than round. It would be really nice if a programmer could make a chart with inputs and outputs. Input BTC/USD (price of bitcoin), 24 hr high/low, price at NYSE open/close, highest/lowest price bought/sold by which market, etc. In the meantime do we have any forex images set to different times of year for daylight savings times that vary with each country?

https://commons.wikimedia.org/wiki/File:Forex_Market_Time_Chart.jpg 2604:3D08:5E7A:6A00:3DBD:3CD9:88AD:6081 18:36, 11 October 2024 (UTC)Reply

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