Trouble scaling components in Glyphs

bruno

#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()

bruno

The object-browser is great! Thanks.

frederik

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/

bruno

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,

frederik

that is a really bug :)

a workaround:
<pre>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)</pre>

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

bruno

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 :)

bruno

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

frederik

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.