FontLab's measurement line in Python

David Jonathan Ross's picture

Hi everyone,

I'm looking for a way to calculate "sidebearings" in a Python script by using (or approximating) FontLab's measurement line. I put "sidebearings" in quotes because I actually want the distance between the edge of the glyph and where the measurement line first crosses a contour. I know that I'm able to run a macro like fl.font.measurement = 0 to set the height of the measurement line, but what I don't know is how to get the values of the modified sidebearings that are shown in the Metrics window when the measurement line is on.

Is there a similar attribute in FontLab's glyph object that isn't documented? Or is there another easy way to calculate this using the contour?

As a temporary solution, I have been able to use RoboFab's contour.pointInside() to get these values by periodically testing points within the bounding box. However, I want to be able to easily get these values for hundreds of glyphs at a time, and this method is quite taxing. There must be an easier way!

Thank you in advance for your help, and my apologies if the answer is already out there. I couldn't find anything with a quick search.

Cheers,
David

k.l.'s picture

Not in the FLS Python API. But Erik van Blokland has added such a function to RoboFab, as a new marginPen object:
http://code.robofab.com/browser/trunk/Lib/robofab/pens/marginPen.py
and even an angledMarginPen:
http://code.robofab.com/browser/trunk/Lib/robofab/pens/angledMarginPen.py

Karsten

David Jonathan Ross's picture

Thank you, Karsten...this is exactly what I was looking for!

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