How to perform pathfinder like operations in roboFont via Python?

[jansindl3r]

Hello,
Please I have such object and I need to cut another shape inside
rectangle of periods overlapping rectangle of O's

OOOOOO
OOOOOO
OOOO.....
OOOO.....
    .....
    .....

expected result is rectangle of O's without the overlapped part

OOOOOO
OOOOOO
OOOO
OOOO

Thanks!

[jansindl3r]

@frederik this is indeed fixed! Sorry for that

[frederik]

Are you using the latest booleanOperation version?

I cannot reproduce this issue or see it in the code

thanks

[jansindl3r]

@frederik I believe that there is some sort of bug on line 60 in BooleanOperationManager

in the second loop iterator is j thought contourCount=i

    for i, subjectContour in enumerate(subjectContours):
        _addContour(clipperPath=pc, contour=subjectContour, fillType=pyclipper.PT_SUBJECT, contourCount=i)

    for j, clipContour in enumerate(clipContours):
        _addContour(clipperPath=pc, contour=clipContour, fillType=pyclipper.PT_CLIP, contourCount=i)

Thanks for help, I went for dividing into two glyphs. I found that handy for removing "multi-overlap".

[frederik]

It does indeed not work on contour level. There are several options:

• split the contours into separate glyphs
• use the lower level booleanOperations:

from booleanOperations import BooleanOperationManager
# create a manager
manager = BooleanOperationManager()
# get the glyph and contours
g = CurrentGlyph()
c1 = g[0]
c2 = g[1]

# create an empty result layer
result = g.getLayer("result")
result.clear()
# perform the difference and draw in to the result point pen
manager.difference([c1], [c2], result.getPointPen())

also see and read the source of this extension: https://github.com/typemytype/pathOperatorRoboFontExtension

good luck!

[jansindl3r]

Hello @gferreira,

I expected this to work the same way like with glyphs, but it doesn't. Is there a different approach when working with contours in one glyph? Thanks

g = CurrentGlyph()
c1 = g[0]
c2 = g[1]
c3 = c1 % c2

Traceback (most recent call last):
  File "<untitled>", line 6, in <module>
TypeError: unsupported operand type(s) for %: 'RContour' and 'RContour'

[jansindl3r]

Hi Gustavo, thanks! Perfect

[gferreira]

hello @jansindl3r,

have a look at Boolean Glyph Math.

cheers!