MarginPen strange behaviour on Start Points

[Telex]

Hi!

I noticed that MarginPen returns different values depending on the start point position.

I mean, when the segment is the first in the contour, the value is not correct, or not well calculated.

If I change the Start Point position (so the segment is not the first one anymore), margin value seems right.

It happens to me in Fontlab and Glyphs.

Did anyone notice that? Or am I doing something wrong?

My simple code:

f=CurrentFont()

def getMargins(g, y):

    pen = MarginPen(g, y, True)

    g.draw(pen)

    crossings = pen.getMargins()

    try:

        margins = (crossings[0], crossings[1])

    except:

        margins = (None, None)

    return margins

print getMargins(f['o'],100)

Graphic explanation below

[Georg Seifert]

This was a problem in the Glyphs pen drawing wrapper. I have fixed it. Please get the latest version of the wrapper file: https://github.com/schriftgestalt/Glyphs-Scripts

Georg

[Andrés Torresi]

Thanks Georg!!!
I was struggling with this and spent many time thinking it was a mistake.
You helped me a lot.

[Erik van Blokland]

Andrés,
you mentioned FontLab as well - is that a separate problem?
Erik

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[Andrés Torresi]

I will check it again, but I think I had that problem.

[Andrés Torresi]

I thought it was a problem in FL also, but it seems to work ok.
Thanks Eric.

On 24/04/14 02:38, Erik van Blokland wrote: