Jos, how does your fraction feature differ from the normal opentype feature code?

ChrisL

Chris, I don't know what the normal or standard OT feature code for fractions is. Some time ago I tried to get it working and took a look at a few Adobe Pro fonts, but I really couldn't figure out how they scripted it.

Jos,
I just now followed your link to Tal's page. His way is way smart for the enduser but adds a Tad more work for the type desighner :-)
It is really cool that someone doing a cookbook can, in less time than it takes to flip an egg, impose the frac feature with the aid of a stylesheet! Goitta love Tal's work. That is one Leming I would surely follow!

ChrisL

It's beautiful and it works like a charm. I'm curious though how other people script the frac feature.

That is one Leming I would surely follow!

Just laughed my head off. Tal may be smart in programming solutions but there's no one smarter in commenting ;-)

What I don’t like about the frac feature like this is that the space will be removed. I think it’s the designer who decides how the fractions must look like, not the typeface. I mean with or without the space in front of the fraction.

Pieter

True and a good point, but the feature is off by default and can also be applied on a selection if you want (you don't need the space) so the designer stays in control.

Amazing. And beautiful. Can't wait ...

Friendelijke Groeten, Tom
(that was almost all Nederlands I know ;-) )

Thanks. Glyphs are not final yet. Still got lots to change, but I'm glad to share the joy I had with this frac thing.

Yes, Dutch does mingle best with English and will still read as Dutch :-)
Viele Grüße von Arnheim

@Jos: "I don’t know what the normal or standard OT feature code for fractions is"

Quite simplified, this is the way I do fractions (follows the description, then the code itself). Derived of Adobe standards, of course. This is a working code I only re-edit to alter the exact figures naming. Depending on the availability of five sixths, four fifths and other [more exotic] fractions you can remove parts of the replacement code below.

So, the explanation.
Requirements: 0-9.numerators, 0-9.denominators

• Define what is considered slash (as class);
• Define already built fractions (like percent, onequarter, onehalf etc.);
• Replace all standard figures with numerators;
• Define replacement rules for the already built fractions;
• Last part: generation of not-ready fractions (like 22/7 etc.)

feature frac {
@slash = [slash fraction];
@prebuilt = [perthousand percent onequarter onehalf threequarters oneeighth threeeighths fiveeighths];

lookup FRAC {
sub [zero zero.pnum] by zero.numr;
sub [one one.pnum onesuperior] by one.numr;
sub [two two.pnum twosuperior] by two.numr;
sub [three three.pnum threesuperior] by three.numr;
sub [four four.pnum foursuperior] by four.numr;
sub [five five.pnum fivesuperior] by five.numr;
sub [six six.pnum sixsuperior] by six.numr;
sub [seven seven.pnum sevensuperior] by seven.numr;
sub [eight eight.pnum eightsuperior] by eight.numr;
sub [nine nine.pnum ninesuperior] by nine.numr;
} FRAC;

sub zero.numr' @slash' zero.numr' zero.numr' zero.numr' by pertenthousand;
sub zero.numr' @slash' zero.numr' zero.numr' by perthousand;
sub zero.numr' @slash' zero.numr' by percent;
sub one.numr' @slash' four.numr' by onequarter;
sub one.numr' @slash' two.numr' by onehalf;
sub three.numr' @slash' four.numr' by threequarters;
sub one.numr' @slash' eight.numr' by oneeighth;
sub three.numr' @slash' eight.numr' by threeeighths;
sub five.numr' @slash' eight.numr' by fiveeighths;
sub seven.numr' @slash' eight.numr' by seveneighths;
sub one.numr' @slash' three.numr' by onethird;
sub two.numr' @slash' three.numr' by twothirds;
sub one.numr' @slash' five.numr' by onefifth;
sub two.numr' @slash' five.numr' by twofifths;
sub three.numr' @slash' five.numr' by threefifths;
sub four.numr' @slash' five.numr' by fourfifths;
sub one.numr' @slash' six.numr' by onesixth;
sub five.numr' @slash' six.numr' by fivesixths;
sub [@slash @fig_dnom @prebuilt] @fig_numr' by @fig_dnom;
} frac;

The beautiful part is it does not need in fact any editing (you can copy and paste this feature code everywhere, if you have defined the classes @fig_dnom [denominators] and @fig_numr [numerators]). Of course Tal's solution is nicer, but this one is easier - and does not have above-mentioned shortcomings (namely, the space problem).

Thank you Asparouh. I'll try it out soon.