Adding attributes to existing classes

Scripting
1

Hi! Is it possible to add attributes to existing classes? I’d need “axes” for special layers, so tried something like this:

setattr(GSLayer, “axes”, None)
for glyph in thisFont.glyphs:
    if layer.isSpecialLayer is True:
        layer.axes = [value]

But the attribute is read-only, can’t find a way to override it. Is there any way to achieve that? Thanks!

2

As this values don’t survive a restart anyway you might be better of using proper API.

layer.setTempData_forKey_(value, "axes")

print(layer.tempDataForKey_("axes"))

I added it to the wrapper, so in the next version you can use:

layer.tempData["axes"] = value

print(layer.tempData["axes"])

But if you really need the property:

GSLayer.axes = property(lambda self: self.tempDataForKey_("axes"),
				lambda self, value: self.setTempData_forKey_(value, "axes"))
1 Like
3

Amazing, thank you!

4

May I also ask is there any difference what master a special layer belongs to? Is it just the matter of the user interface, or does it make some difference in interpolation?

5

The for brace layers it is not important to what master they belong.

May I ask what you are trying to do?

1 Like
6

It’s for a script that cuts a variable font in smaller parts. Nearly there!