append contour to a glyph with Python

jansindl3r

Hi, I have been trying to append segments to a new contour. That gives me an error. When I do the same but instead of creating a contour with python I use already existing one it works. What is the correct way to create a contour with segments and append it to the glyph? When I change contour = RContour() to contour = c1 # existing contour and leave it's native segment type, then it works. Thanks for help!

def interpolateContours(c1, c2, f):
    contour = RContour()
    for seg1, seg2 in zip(c1, c2):
        points = map(lambda p: interPoint(*p, f), zip(seg1, seg2))
        segType = seg1.type if seg1.type != 'move' else 'line'
        contour.appendSegment(segType, list(points))

IndexError: list index out of range

frederik

true, good luck!

jansindl3r

@frederik sweet, thanks! It needs more when it needs to handle curves too I think, for now it is good enough.

def interpolateContours(c1, c2, f):
    contour = RContour()    
    for seg1, seg2 in zip(c1, c2):
        assert seg1.type == seg2.type
        coos = map(lambda p: interPoint(*p, f), zip(seg1, seg2))
        for coo, point in zip(coos, seg1.points):
            contour.appendPoint(coo, point.type)
    return contour

frederik

oh see pull request here: https://github.com/robotools/fontParts/pull/480

this will be fixed in the release!!

but something else: why using appendSegment? and not using a pen like contour.appendPoint to draw into that contour, or even do the calculation with pens or use fontMath

def interPoint(p1, p2, factor):
    return p1.x + (p2.x - p1.x) * factor, p1.y + (p2.y - p1.y) * factor

def interpolateContours(c1, c2, f):
    contour = RContour()    
    for seg1, seg2 in zip(c1, c2):
        assert seg1.type == seg2.type
        points = map(lambda p: interPoint(*p, f), zip(seg1, seg2))
        for point in points:
            contour.appendPoint(point, seg1.type)
    return contour

SOLVED append contour to a glyph with Python