Deleting all handles unexpectedly deletes entire contour

[ryan]

When I option-select all off-curve points in a contour to delete them, it sometimes results in a complete deletion of the contour. Expected result would be a leftover curveless contour.

See screen recording for what I'm talking about

[frederik]

create bug!!

RF decided somehow those contours are really bad... and deleted them for you, its a FEATURE!!

fixed in the next update!!!

[ryan]

@gferreira Thanks for the code!

@frankrolf Yeah I think it does. Doesn't always reproduce.

[frankrolf]

Okay, maybe this has to do with the combination of curveTos and lineTos:

[frankrolf]

I remember the same behavior. Although, when testing it out just now (Version 3.4b (build 1912091618)), I get this:

[gferreira]

probably a bug… @frederik

here’s another way of converting all curve segments to straight lines, using a pen:

from fontTools.pens.basePen import BasePen

class LinePen(BasePen):

    def __init__(self, otherPen):
        BasePen.__init__(self, {})
        self.otherPen = otherPen
        self.currentPt = None
        self.firstPt = None

    def _moveTo(self, pt):
        self.otherPen.moveTo(pt)
        self.currentPt = pt
        self.firstPt = pt

    def _lineTo(self, pt):
        self.otherPen.lineTo(pt)
        self.currentPt = pt

    def _curveToOne(self, pt1, pt2, pt3):
        self.otherPen.lineTo(pt3)
        self.currentPt = pt3

    def _closePath(self):
        self.lineTo(self.firstPt)
        self.otherPen.closePath()
        self.currentPt = None

    def _endPath(self):
        self.otherPen.endPath()
        self.currentPt = None

    def addComponent(self, glyphName, transformation):
        self.otherPen.addComponent(glyphName, transformation)

# get a glyph with curve segments
source = CurrentGlyph()
# make a new temp glyph for the result
result = RGlyph()
# get a pen to draw into the result glyph
drawPen = result.getPen()
# get a pen to convert curves to lines
linePen = LinePen(drawPen)
# draw the result using the line pen
source.draw(linePen)
# replace source contours with result
source.clearContours()
source.appendGlyph(result)

(there are probably simpler ways to do it :)

hope this helps!