API for changing layer type to color?

oneweioranother · March 20, 2025, 7:42am

I’m trying to make a stroke font as Georg outlined here:

exporting OpenType-SVG from Glyphs directly

opened 03:29PM - 30 Aug 22 UTC

It is possible to export a single line OpenType-SVG font directly from Glyphs: … In the instances (in Font Info > Exports) you add a "Color Layers to SVG" custom parameter and make sure the checkbox is set. Then draw your letters with open path and apply a stroke thickness (in the lower right). Then duplicate the layer in layer panel and make it a color layer (right click the copied layer and click "Color"). Then export the font and use it as described in the Relief repo. There is one small issue with this method right now. You need to sync the outlines in the main layer and the color layer. But that could be done by a script that copies the outlines from the main layer to the color layer. I just had a look and made some adjustments that makes it much easier. So no duplication of layer any more. That will be in an update soon.

But it’s very tedious to change the layers one by one, I couldn’t find the API documentation for changing a layer type to ‘Color’.

jkutilek · March 20, 2025, 8:13am

I think it is in GSLayer.attributes: Glyphs.app Python Scripting API Documentation — Glyphs.app Python Scripting API 3.2 documentation

GeorgSeifert · March 20, 2025, 10:25am

You mean switching “Color” in the layer panel? Then Jens is right.