Change kerning between math characters (prime and left parenthesis)

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Mikael P. Sundqvist

2 Jun 2017 2 Jun '17

8:59 a.m.

Hi! Now that the bug with primes is fixed in ConTeXt, I wonder if there is a way to change the kerning between certain characters in mathematics (in case one is not happy with the output from the font)? After reading in fonts-mkiv.pdf this is what I came up with: \startluacode fonts.handlers.otf.addfeature { name = "kerntest", type = "kern", data = { [0x61] = { [0x62] = -150 }, -- a and b in text [0x1d44e] = { [0x1d44f] = -150 }, -- mathematical italic small a and b [0x02032] = { [0x00028] = -150 }, -- prime and left parenthesis } } \stopluacode \definefontfeature[kerntest][kerntest=yes] \definefontfamily[lucidaopentype][rm][Lucida Bright OT] \definefontfamily[lucidaopentype][mm][Lucida Bright Math OT] \setupbodyfont[lucidaopentype,10pt] \startTEXpage[offset=3pt] abba $abba f'(x)$ \addff{kerntest} abba $abba f'(x)$ I prefer $f'\mkern-3mu(x)$ \stopTEXpage The output is attached as a png file. As you see the kerning works as expected in text mode, but not at all in math mode, even not for the a and b (which I hope I entered correctly). Something like the third line is what I'm after, but not having to use \mkern in all places. Is it possible? /Mikael PS: This is a cross post of the question https://tex.stackexchange.com/q/372857/52406, where I got the suggestion to ask on the list.

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Mathias Schickel

2 Jun 2 Jun

9:39 a.m.

New subject: Change kerning between math characters (prime and left parenthesis)

Hi Mikael, math fonts are a bit different from text fonts. This means that you need special methods to influence them. Because I once had a similar concern like you I asked Hans to implement a way to influence kerning in math fonts between certain glyphs. I have attached an lfg-file that shows how to use it. To enable a goodie file like the one attached you have to define your typescript like \starttypescript [\s!math][cambriaown][\s!all] \loadfontgoodies[cambriaown-math] \definefontsynonym[\s!MathRoman] [Cambria-Math] [\s!features={\s!math\mathsizesuffix},\s!designsize=\s!auto,\s!goodies=cambriaown-math] \stoptypescript I hope this helps! Best Mathias

...

Am 02.06.2017 um 10:59 schrieb Mikael P. Sundqvist :

Hi!

Now that the bug with primes is fixed in ConTeXt, I wonder if there is a way to change the kerning between certain characters in mathematics (in case one is not happy with the output from the font)? After reading in fonts-mkiv.pdf this is what I came up with:

\startluacode fonts.handlers.otf.addfeature { name = "kerntest", type = "kern", data = { [0x61] = { [0x62] = -150 }, -- a and b in text [0x1d44e] = { [0x1d44f] = -150 }, -- mathematical italic small a and b [0x02032] = { [0x00028] = -150 }, -- prime and left parenthesis } } \stopluacode

\definefontfeature[kerntest][kerntest=yes]

\definefontfamily[lucidaopentype][rm][Lucida Bright OT] \definefontfamily[lucidaopentype][mm][Lucida Bright Math OT]

\setupbodyfont[lucidaopentype,10pt]

\startTEXpage[offset=3pt] abba $abba f'(x)$

\addff{kerntest}

abba $abba f'(x)$

I prefer $f'\mkern-3mu(x)$ \stopTEXpage

The output is attached as a png file. As you see the kerning works as expected in text mode, but not at all in math mode, even not for the a and b (which I hope I entered correctly).

Something like the third line is what I'm after, but not having to use \mkern in all places. Is it possible?

/Mikael

PS: This is a cross post of the question https://tex.stackexchange.com/q/372857/52406, where I got the suggestion to ask on the list. ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___________________________________________________________________________________

Mikael P. Sundqvist

11:39 a.m.

New subject: Change kerning between math characters (prime and left parenthesis)

On Fri, Jun 2, 2017 at 11:39 AM, Mathias Schickel wrote:

...

Hi Mikael,

math fonts are a bit different from text fonts. This means that you need special methods to influence them. Because I once had a similar concern like you I asked Hans to implement a way to influence kerning in math fonts between certain glyphs. I have attached an lfg-file that shows how to use it.

To enable a goodie file like the one attached you have to define your typescript like

\starttypescript [\s!math][cambriaown][\s!all] \loadfontgoodies[cambriaown-math] \definefontsynonym[\s!MathRoman] [Cambria-Math] [\s!features={\s!math\mathsizesuffix},\s!designsize=\s!auto,\s!goodies=cambriaown-math] \stoptypescript

I hope this helps!

Best Mathias

...
Am 02.06.2017 um 10:59 schrieb Mikael P. Sundqvist :

Hi!

Now that the bug with primes is fixed in ConTeXt, I wonder if there is a way to change the kerning between certain characters in mathematics (in case one is not happy with the output from the font)? After reading in fonts-mkiv.pdf this is what I came up with:

\startluacode fonts.handlers.otf.addfeature { name = "kerntest", type = "kern", data = { [0x61] = { [0x62] = -150 }, -- a and b in text [0x1d44e] = { [0x1d44f] = -150 }, -- mathematical italic small a and b [0x02032] = { [0x00028] = -150 }, -- prime and left parenthesis } } \stopluacode

\definefontfeature[kerntest][kerntest=yes]

\definefontfamily[lucidaopentype][rm][Lucida Bright OT] \definefontfamily[lucidaopentype][mm][Lucida Bright Math OT]

\setupbodyfont[lucidaopentype,10pt]

\startTEXpage[offset=3pt] abba $abba f'(x)$

\addff{kerntest}

abba $abba f'(x)$

I prefer $f'\mkern-3mu(x)$ \stopTEXpage

The output is attached as a png file. As you see the kerning works as expected in text mode, but not at all in math mode, even not for the a and b (which I hope I entered correctly).

Something like the third line is what I'm after, but not having to use \mkern in all places. Is it possible?

/Mikael

PS: This is a cross post of the question https://tex.stackexchange.com/q/372857/52406, where I got the suggestion to ask on the list. ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___________________________________________________________________________________

___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___________________________________________________________________________________

Thank you very much for your reply, Mathias! I'm not sure I get it, though. I find that there is already a file lucida-opentype-math.lfg in the distribution. Just experimenting, I added to this file an entry with kernpairs (see below), to see if I could make a change with a and b (if I cannot manage that, I don't see how I could get the prime and parenthesis case to work). %%% start of my new lucida-opentype-math.lfg ----- kern_250 = { bottomright = { { kern = -250 } }, force = true } return { name = "lucida-opentype-math", version = "1.00", comment = "Goodies that complement lucida opentype.", author = "Hans Hagen", copyright = "ConTeXt development team", mathematics = { alternates = { italic = { feature = 'ss01', value = 1, comment = "Mathematical Alternative Lowercase Italic" }, arrow = { feature = 'ss02', value = 1, comment = "Mathematical Alternative Smaller Arrows" }, operator = { feature = 'ss03', value = 1, comment = "Mathematical Alternative Smaller Operators" }, calligraphic = { feature = 'ss04', value = 1, comment = "Mathematical Alternative Calligraphic Characters" }, zero = { feature = 'ss05', value = 1, comment = "Mathematical Alternative Zero" }, partial = { feature = 'ss20', value = 1, comment = "Mathematical Alternative Upright Partial Differential" }, }, -- kerns = { -- [0x1D449] = kern_250, -- -- [0x1D44A] = kern_250, -- 𝑊 -- }, kernpairs = { [0x1D44E] = { -- a [0x1D44F] = -200,} -- b }, dimensions = { default = { -- experimental values [0x2044] = { xoffset = 275, width = 600 }, -- [0x2032] = { yoffset = -10 }, }, }, }, } %%% end of lucida-opentype-math.lfg but in the output of \setupbodyfont[lucidaot,10pt] \startTEXpage[offset=3pt] $ab$ \stopTEXpage I see no changes in the spacing between a and b. Any ideas? /Mikael

Mikael P. Sundqvist

12:36 p.m.

New subject: Change kerning between math characters (prime and left parenthesis)

On Fri, Jun 2, 2017 at 1:39 PM, Mikael P. Sundqvist wrote:

...

On Fri, Jun 2, 2017 at 11:39 AM, Mathias Schickel wrote:

...
Hi Mikael,

math fonts are a bit different from text fonts. This means that you need special methods to influence them. Because I once had a similar concern like you I asked Hans to implement a way to influence kerning in math fonts between certain glyphs. I have attached an lfg-file that shows how to use it.

To enable a goodie file like the one attached you have to define your typescript like

\starttypescript [\s!math][cambriaown][\s!all] \loadfontgoodies[cambriaown-math] \definefontsynonym[\s!MathRoman] [Cambria-Math] [\s!features={\s!math\mathsizesuffix},\s!designsize=\s!auto,\s!goodies=cambriaown-math] \stoptypescript

I hope this helps!

Best Mathias

...
Am 02.06.2017 um 10:59 schrieb Mikael P. Sundqvist :

Hi!

Now that the bug with primes is fixed in ConTeXt, I wonder if there is a way to change the kerning between certain characters in mathematics (in case one is not happy with the output from the font)? After reading in fonts-mkiv.pdf this is what I came up with:

\startluacode fonts.handlers.otf.addfeature { name = "kerntest", type = "kern", data = { [0x61] = { [0x62] = -150 }, -- a and b in text [0x1d44e] = { [0x1d44f] = -150 }, -- mathematical italic small a and b [0x02032] = { [0x00028] = -150 }, -- prime and left parenthesis } } \stopluacode

\definefontfeature[kerntest][kerntest=yes]

\definefontfamily[lucidaopentype][rm][Lucida Bright OT] \definefontfamily[lucidaopentype][mm][Lucida Bright Math OT]

\setupbodyfont[lucidaopentype,10pt]

\startTEXpage[offset=3pt] abba $abba f'(x)$

\addff{kerntest}

abba $abba f'(x)$

I prefer $f'\mkern-3mu(x)$ \stopTEXpage

The output is attached as a png file. As you see the kerning works as expected in text mode, but not at all in math mode, even not for the a and b (which I hope I entered correctly).

Something like the third line is what I'm after, but not having to use \mkern in all places. Is it possible?

/Mikael

PS: This is a cross post of the question https://tex.stackexchange.com/q/372857/52406, where I got the suggestion to ask on the list. ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___________________________________________________________________________________

___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___________________________________________________________________________________

Thank you very much for your reply, Mathias!

I'm not sure I get it, though. I find that there is already a file lucida-opentype-math.lfg in the distribution.

Just experimenting, I added to this file an entry with kernpairs (see below), to see if I could make a change with a and b (if I cannot manage that, I don't see how I could get the prime and parenthesis case to work).

%%% start of my new lucida-opentype-math.lfg ----- kern_250 = { bottomright = { { kern = -250 } }, force = true }

return { name = "lucida-opentype-math", version = "1.00", comment = "Goodies that complement lucida opentype.", author = "Hans Hagen", copyright = "ConTeXt development team", mathematics = { alternates = { italic = { feature = 'ss01', value = 1, comment = "Mathematical Alternative Lowercase Italic" }, arrow = { feature = 'ss02', value = 1, comment = "Mathematical Alternative Smaller Arrows" }, operator = { feature = 'ss03', value = 1, comment = "Mathematical Alternative Smaller Operators" }, calligraphic = { feature = 'ss04', value = 1, comment = "Mathematical Alternative Calligraphic Characters" }, zero = { feature = 'ss05', value = 1, comment = "Mathematical Alternative Zero" }, partial = { feature = 'ss20', value = 1, comment = "Mathematical Alternative Upright Partial Differential" }, }, -- kerns = { -- [0x1D449] = kern_250, -- -- [0x1D44A] = kern_250, -- 𝑊 -- }, kernpairs = { [0x1D44E] = { -- a [0x1D44F] = -200,} -- b }, dimensions = { default = { -- experimental values [0x2044] = { xoffset = 275, width = 600 }, -- [0x2032] = { yoffset = -10 }, }, }, }, } %%% end of lucida-opentype-math.lfg

but in the output of

\setupbodyfont[lucidaot,10pt] \startTEXpage[offset=3pt] $ab$ \stopTEXpage

I see no changes in the spacing between a and b.

Any ideas?

/Mikael

If I change the dimensions tag in the lucida-opentype-math.lfg into dimensions = { default = { -- experimental values [0x2044] = { xoffset = 275, width = 600 }, [0x2032] = { xoffset = 40, width = 290 }, -- prime [0x2033] = { xoffset = 40, width = 690 }, -- double prime [0x2034] = { xoffset = 40, width = 1090 }, -- triple prime [0x2057] = { xoffset = 40, width = 1490 }, -- quadruple prime -- [0x2032] = { yoffset = -10 }, }, I get something that looks better (look at the attached pdf file). But I don't know the side-effects of changing the offset and with of glyphs like that. It might break something at some other place, I guess. Hans, is there a way to work only on the pair between the prime and the parenthesis? /Mikael

Hans Hagen

2:24 p.m.

New subject: Change kerning between math characters (prime and left parenthesis)

On 6/2/2017 10:59 AM, Mikael P. Sundqvist wrote:

...

Hi!

Now that the bug with primes is fixed in ConTeXt, I wonder if there is a way to change the kerning between certain characters in mathematics (in case one is not happy with the output from the font)? After reading in fonts-mkiv.pdf this is what I came up with:

you can also play withj: return { name = "cambria-math", mathematics = { kerns = { [0x1D453] = { force = true, topright = { { kern = 1000, }, }, bottomright = { { kern = 1000, }, }, }, }, }, } currently you need to enable this: \enabledirectives[fontgoodies.mathkerning] keep in mind that some cambria (not all) have such staircase kerns which is why force is needed in order to overload

...

\startluacode fonts.handlers.otf.addfeature { name = "kerntest", type = "kern", data = { [0x61] = { [0x62] = -150 }, -- a and b in text [0x1d44e] = { [0x1d44f] = -150 }, -- mathematical italic small a and b [0x02032] = { [0x00028] = -150 }, -- prime and left parenthesis } } \stopluacode

\definefontfeature[kerntest][kerntest=yes]

\definefontfamily[lucidaopentype][rm][Lucida Bright OT] \definefontfamily[lucidaopentype][mm][Lucida Bright Math OT]

\setupbodyfont[lucidaopentype,10pt]

\startTEXpage[offset=3pt] abba $abba f'(x)$

\addff{kerntest}

abba $abba f'(x)$

I prefer $f'\mkern-3mu(x)$ \stopTEXpage

The output is attached as a png file. As you see the kerning works as expected in text mode, but not at all in math mode, even not for the a and b (which I hope I entered correctly).

Something like the third line is what I'm after, but not having to use \mkern in all places. Is it possible?

/Mikael

PS: This is a cross post of the question https://tex.stackexchange.com/q/372857/52406, where I got the suggestion to ask on the list.

___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___________________________________________________________________________________

-- ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------

Mikael P. Sundqvist

3:08 p.m.

New subject: Change kerning between math characters (prime and left parenthesis)

On Fri, Jun 2, 2017 at 4:24 PM, Hans Hagen wrote:

...

On 6/2/2017 10:59 AM, Mikael P. Sundqvist wrote:

...
Hi!

Now that the bug with primes is fixed in ConTeXt, I wonder if there is a way to change the kerning between certain characters in mathematics (in case one is not happy with the output from the font)? After reading in fonts-mkiv.pdf this is what I came up with:

you can also play withj:

return { name = "cambria-math", mathematics = { kerns = { [0x1D453] = { force = true, topright = { { kern = 1000, }, }, bottomright = { { kern = 1000, }, }, }, }, }, }

currently you need to enable this:

\enabledirectives[fontgoodies.mathkerning]

keep in mind that some cambria (not all) have such staircase kerns which is why force is needed in order to overload

...
\startluacode fonts.handlers.otf.addfeature { name = "kerntest", type = "kern", data = { [0x61] = { [0x62] = -150 }, -- a and b in text [0x1d44e] = { [0x1d44f] = -150 }, -- mathematical italic small a and b [0x02032] = { [0x00028] = -150 }, -- prime and left parenthesis } } \stopluacode

\definefontfeature[kerntest][kerntest=yes]

\definefontfamily[lucidaopentype][rm][Lucida Bright OT] \definefontfamily[lucidaopentype][mm][Lucida Bright Math OT]

\setupbodyfont[lucidaopentype,10pt]

\startTEXpage[offset=3pt] abba $abba f'(x)$

\addff{kerntest}

abba $abba f'(x)$

I prefer $f'\mkern-3mu(x)$ \stopTEXpage

The output is attached as a png file. As you see the kerning works as expected in text mode, but not at all in math mode, even not for the a and b (which I hope I entered correctly).

Something like the third line is what I'm after, but not having to use \mkern in all places. Is it possible?

/Mikael

PS: This is a cross post of the question https://tex.stackexchange.com/q/372857/52406, where I got the suggestion to ask on the list.

___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net

___________________________________________________________________________________

--

----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------

___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___________________________________________________________________________________

Thank you Hans, that works. Is there also a similar way to use the "kernpairs" instead of "kerns"? I get no effect, even after adding force = true and \enabledirectives[fontgoodies.mathkerning]. /Mikael

Hans Hagen

3:56 p.m.

New subject: Change kerning between math characters (prime and left parenthesis)

On 6/2/2017 5:08 PM, Mikael P. Sundqvist wrote:

...

Is there also a similar way to use the "kernpairs" instead of "kerns"? I get no effect, even after adding force = true and \enabledirectives[fontgoodies.mathkerning]. it depends ... math is a tree of noades and not all nodes are a sequence of characters

Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------

Mikael P. Sundqvist

4:01 p.m.

New subject: Change kerning between math characters (prime and left parenthesis)

On Fri, Jun 2, 2017 at 5:56 PM, Hans Hagen wrote:

...

On 6/2/2017 5:08 PM, Mikael P. Sundqvist wrote:

...
Is there also a similar way to use the "kernpairs" instead of "kerns"? I get no effect, even after adding force = true and \enabledirectives[fontgoodies.mathkerning].

it depends ... math is a tree of noades and not all nodes are a sequence of characters

Hans

----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl ----------------------------------------------------------------- ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___________________________________________________________________________________

Indeed, it seems that I get it working between a and b but not between ' and ( with the following: kernpairs = { [0x1D44E] = {[0x1D44F] = -200,}, -- a and b [0x2032] = {[0x0028] = -1000, }, -- prime and ( }, together with \setupmathematics[kernpairs=yes] in the file. I guess I will stick with the dimension parameters mentioned earlier for now. It seems to work well in my bigger file. /Mikael

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Hans Hagen
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Change kerning between math characters (prime and left parenthesis)

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