I’ve seen pieces of this around the forum, but thought a reproducible summary might be helpful. Text with (an svg) font size specified in px units does show up at the right size (or at all) using export ¦ as Image ¦ SVG. It appears that the export software does not understand the units, and ends up exporting with a font-size of “0”. Simply removing the units from the font-size in the style attribute works around the problem, but a more general solution would be to fix the export logic. Fritzing itself handles the text correctly in the views.
Version 0.9.2 (b8d2d5970658f0bed09c661c9
Have not upgraded to 0.9.3, since trying to stay with what is provided in the Fedora repos.
grep -c -E "font-size:[0-9]+?(\.[0-9]*)?px" /usr/share/fritzing/parts/svg/core/*/*.svg | grep ":[1-9]" | wc
107 files found, although the icon files probably do not matter. They are never exported.
grep -c -E "font-size:[0-9]+?(\.[0-9]*)?[a-z]" /usr/share/fritzing/parts/svg/core/*/*.svg | grep ":[1-9]" | wc
108 files found, although the icon files probably don´t matter. They are never exported.
Simple (hopefully) reproducible example. In an empty sketch:
find and place a TLP621
Fit the breadboard view to the window
File ¦ Export ¦ as Image ¦ SVG ¦ test_bb.svg
Outside of Fritzing, view the original and exported image files
The “TLP” and “621” text is visible in the original, but not in the export.
Use a text editor to look at the 2 files.
In Optocoupler_TLP621_breadboard.svg, the text elements for TLP and 621 are wrapped in groups with style attributes. Both start with “font-size:4.44444418px”.
In test_bb.svg, the matching text elements are also wrapped inside group elements, but now the style does not have a font-size entry, and there is new font-size attribute set to “0”. Changing that “0” to either “4.44444418px” or “4.44444418” gets the text to show up, although the size is wrong.
Exit everything without saving.
Change font-size:4.44444418px to font-size:4.44444418 in Optocoupler_TLP621_breadboard.svg.
Repeat the find, place, fit, export, view.
The text is visible in both the original and export.
Viewing the export file in a text editor shows that the font-size has still been removed from the style attribute, but now the font-size attribute is set to “3.2”.
As a guess, the parsing code for the svg export is attempting to convert the whole “4.44444418px” string to a number, which fails and gives 0. It is not expecting or looking for units.