Issue with interpolatedFontProxy

#1

It seems that I can’t get any layers from an instance that is not added to Font.instances with interpolatedFontProxy.
Example:

def make_instance(*values):
  i = GSInstance()
  i.font = Font
  for x in range(len(i.axes)):
    i.axes[x] = values[x]
  return i.interpolatedFontProxy
interpolatedFont = make_instance(50) #or any available value
print(interpolatedFont.glyphs['a'].layers[0]

would print None. Adding the instance to Font.instances fixes it, but I’d rather not do that, nor use interpolatedFont. Any idea?

#2 
print(interpolatedFont.glyphs['a'].layers[interpolatedFont.fontMasterID()])

or

print(interpolatedFont.glyphs['a'].layers[interpolatedFont.masters[0].id)])

But the index should work, too. I’ll have a look.

#3

The problem is that the instance gets deallocated when your function returns. So you need to store it somewhere until you are done. A global list will do the trick.

instances = []
def make_instance(*values):
  i = GSInstance()
  instances.append(i)
  i.font = Font
  for x in range(len(i.axes)):
    i.axes[x] = values[x]
  return i.interpolatedFontProxy
interpolatedFont = make_instance(50) #or any available value
print(interpolatedFont.glyphs['a'].layers[0])
1 Like
#4

Thanks Georg! I think I get the general logic behind this (the actual instance object doesn’t exist outside the scope of the function) but then, shouldn’t I just be unable to access anything via interpolatedFontProxy? I could still get some stuff, like glyphs, or the master, but just not layers.

In my particular case, I guess it’ll be easier to just have the function return the instance instead. Why didn’t I think of that before, well… ¯\(ツ)/¯

def make_instance(*values):
  i = GSInstance()
  i.font = Font
  for x in range(len(i.axes)):
    i.axes[x] = values[x]
  return i
instance = make_instance(50)
interpolatedFont = instance.interpolatedFontProxy
print(interpolatedFont.glyphs['a'].layers[0])
1 Like
#5

The proxy needs the instance now and then.

1 Like