Trouble scaling components in Glyphs

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This topic contains 7 replies, has 2 voices, and was last updated by  Bruno 8 years, 10 months ago.

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  • December 12, 2011 at 14:50 #2157

    Bruno
    Participant

    #this works; scales the glyph nicely (components uses glyph coordinate)
    g = CurrentGlyph()
    g.scale((0.5, 0.5))
    g.update()

    #this doesn’t work as expected; component use their own coordinates
    f = CurrentFont()
    for g in f:
    g.scale((0.5, 0.5))
    g.update()

    December 12, 2011 at 15:04 #2159

    frederik
    Keymaster

    yeah off course, you scale the component base glyphs to :)
    so components will be double scaled, once by their base glyphs and once by the component transformation that get scaled.

    December 12, 2011 at 20:51 #2166

    Bruno
    Participant

    Haha, it drove me insane. Thanks for your enlightenment.

    December 13, 2011 at 09:42 #2177

    Bruno
    Participant

    I have still not managed to transform the font successfully.
    Do I oversee something again? It looks like a bug to me:

    ========================
    f = CurrentFont()
    for g in f:
    if len(g.contours) > 0:
    for c in g.contours:
    c.scale((0.5, 0.5))
    ========================
    Traceback:
    File “2000UPM.py”, line 13, in
    File “lib/fontObjects/robofabWrapper.pyc”, line 1432, in scale
    File “/Applications/RoboFont.app/Contents/Resources/lib/python2.7/fontTools/misc/transform.py”, line 148, in scale
    File “/Applications/RoboFont.app/Contents/Resources/lib/python2.7/fontTools/misc/transform.py”, line 199, in transform
    TypeError: can only concatenate tuple (not “int”) to tuple
    ========================

    I can make it work via metric transformations. But it’s not as elegant :)

    December 13, 2011 at 21:11 #2196

    frederik
    Keymaster

    that is a really bug :)

    a workaround:

    from fontTools.misc.transform import Transform

f = CurrentFont()

t = Transform().scale(.5, .5)

## possible transformations:
## .translate(x, y)
## .rotate(radiansAngle)
## .skew(x, y)
## .inverse()

for g in f:
    g.transform(t, doComponents=False)
    
    # or for each contour
    # for c in g:
    #    c.transform(t)

    hope this helps,
    thanks for reporting and this will be solved in the next update.

    December 14, 2011 at 03:28 #2203

    Bruno
    Participant

    Cool!

    Where can I see the RoboFont transform function/glyph class?

    I would like to check out if it has any other properties I am unaware off. Is there some documentation I am missing? The fontobjects source is bytecode:

    robofabWrapper.pyc

    Thanks,

    December 14, 2011 at 18:49 #2209

    frederik
    Keymaster

    see: http://robofab.com/howto/usetransformations.html

    http://doc.robofont.com/api/robofab-extras/

    and maybe a handy thing:
    http://doc.robofont.com/api/scripting-examples/object-browser/

    December 15, 2011 at 07:11 #2219

    Bruno
    Participant

    The object-browser is great! Thanks.

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