Line width <0.5mm not exported to SVG in TechDraw Workbench

[maxagaz]

In the TechDraw Workbench, I have imported a single Line made in the Sketcher, but it's not displayed nor exportable to SVG if its width is smaller than 0.50mm. It's working for other polylines also imported from the Sketcher.

In attachement is a basic test file I made with FreeCAD 0.17 and 0.18 on macOS.

Test.FCStd

(20.06 KiB) Downloaded 34 times

Is it a bug or did I make a bad manipulation somewhere ?

Screen Shot 2018-05-02 at 17.02.55.png (377.75 KiB) Viewed 857 times

Screen Shot 2018-05-02 at 17.07.51.png (456.99 KiB) Viewed 857 times

Screen Shot 2018-05-02 at 17.08.12.png (487.88 KiB) Viewed 857 times

OS: Mac OS X
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.13651 (Git)
Build type: Release
Branch: (HEAD detached at 4604bd9)
Hash: 4604bd9456688e6108b1b5f1a0dcc7f8d205555f
Python version: 2.7.14
Qt version: 5.10.1
Coin version: 4.0.0a
OCC version: 7.2.0
Locale: English/UnitedStates (en_US)

[chrisb]

I can scale down to 0.1mm. Did you try enlarging the page view?

Bildschirmfoto 2018-05-02 um 13.04.09.png (43.96 KiB) Viewed 848 times

OS: Mac OS X
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.13651 (Git)
Build type: Release
Branch: (HEAD detached at 4604bd9)
Hash: 4604bd9456688e6108b1b5f1a0dcc7f8d205555f
Python version: 2.7.14
Qt version: 5.10.1
Coin version: 4.0.0a
OCC version: 7.2.0
Locale: German/Germany (de_DE)

[wandererfan]

In the TechDraw Workbench, I have imported a single Line made in the Sketcher, but it's not displayed nor exportable to SVG if its width is smaller than 0.50mm. It's working for other polylines also imported from the Sketcher.

You're using a DraftView to display a Sketch. I'm surprised it worked at all. Sketches are not Draft objects.

If you use regular TD View you can make the line any width you want.

There does seem to be something odd about the line width for a DraftView. Maybe the conversion to pixels in Draft??

[wandererfan]

Maybe the conversion to pixels in Draft??

This is the issue. Draft.getSVG scales the LineWidth (LineWidth = LineWidth/Scale) then uses the result as a Svg stroke-width in pixels. So your 0.5 mm LineWidth gets converted to 0.5px before display.

The line is in the exported Svg file even with a width < 0.5.

Stoke width = 0 is never drawn by Svg, but I don't know what the rules are for displaying a line < 1/2 px in width.