Change kerning between math characters (prime and left parenthesis)

Change kerning between math characters (prime and left parenthesis)

[Mikael P. Sundqvist]

[-- Attachment #1: Type: text/plain, Size: 1315 bytes --]

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.

[-- Attachment #2: ctx-example20.png --]
[-- Type: image/png, Size: 40825 bytes --]

[-- Attachment #3: Type: text/plain, Size: 492 bytes --]

___________________________________________________________________________________
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
___________________________________________________________________________________

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

[Mathias Schickel]

[-- Attachment #1: Type: text/plain, Size: 701 bytes --]

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


[-- Attachment #2: cambriaown-math.lfg --]
[-- Type: application/octet-stream, Size: 2061 bytes --]

local kern_100 = { bottomright = { { kern = -10000 } } }
local kern_150 = { bottomright = { { kern = -15000 } } }
local kern_200 = { bottomright = { { kern = -20000 } } }

local patches = fonts.handlers.otf.enhancers.patches

local function patch(data,filename,threshold)
    local m = data.metadata.math
    if m then
        local d = m.DisplayOperatorMinHeight or 0
        if d < threshold then
            patches.report("DisplayOperatorMinHeight(%s -> %s)",d,threshold)
            m.DisplayOperatorMinHeight = threshold
        end
    end
end

patches.register("after","analyze math","cambria", function(data,filename) patch(data,filename,2800) end)
patches.register("after","analyze math","cambmath",function(data,filename) patch(data,filename,2800) end)

-- This is a runtime fix, but then we need to explicitly set
-- the goodies parameter for the font. As a demonstration we
-- we do both.

local function FixDisplayOperatorMinHeight(value,target,original)
    local o = original.mathparameters.DisplayOperatorMinHeight
    if o < 2800 then
        return 2800 * target.parameters.factor
    else
        return value -- already scaled
    end
end

return {
    name = "cambriaown-math",
    version = "1.00",
    comment = "Goodies that complement Cambria fonts.",
    author  = "Mathias Schickel",
    copyright = "Mathias Schickel",
    designsizes = {
        ["Cambria-Math"] = {
            ["11pt"] = "file:cambria.ttc(Cambria Math)",
            default   = "file:cambria.ttc(Cambria Math)",
        },
    },
    mathematics = {
        parameters = {
            DisplayOperatorMinHeight = FixDisplayOperatorMinHeight,
        },
        kerns = {
            [0x1D449] = kern_200,	-- 𝑉
        },
        kernpairs = {
           [0x2207] = {				-- \nabla
               [0x1D453] = -200,	-- f
           },
           [0x2202] = {				-- \partial
           	   [0x1D465] = -30,		-- x
           	   [0x1D466] = -80,		-- y
           },
       },
    },
}

[-- Attachment #3: Type: text/plain, Size: 2084 bytes --]




> Am 02.06.2017 um 10:59 schrieb Mikael P. Sundqvist <mickep@gmail.com>:
> 
> 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.
> <ctx-example20.png>___________________________________________________________________________________
> 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
> ___________________________________________________________________________________


[-- Attachment #4: Type: text/plain, Size: 492 bytes --]

___________________________________________________________________________________
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
___________________________________________________________________________________

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

[Mikael P. Sundqvist]

On Fri, Jun 2, 2017 at 11:39 AM, Mathias Schickel
<msch@fa.uni-tuebingen.de> 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 <mickep@gmail.com>:
>>
>> 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.
>> <ctx-example20.png>___________________________________________________________________________________
>> 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 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
___________________________________________________________________________________

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

[Mikael P. Sundqvist]

[-- Attachment #1: Type: text/plain, Size: 6804 bytes --]

On Fri, Jun 2, 2017 at 1:39 PM, Mikael P. Sundqvist <mickep@gmail.com> wrote:
> On Fri, Jun 2, 2017 at 11:39 AM, Mathias Schickel
> <msch@fa.uni-tuebingen.de> 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 <mickep@gmail.com>:
>>>
>>> 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.
>>> <ctx-example20.png>___________________________________________________________________________________
>>> 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

[-- Attachment #2: ctx-example21.pdf --]
[-- Type: application/pdf, Size: 6719 bytes --]

[-- Attachment #3: Type: text/plain, Size: 492 bytes --]

___________________________________________________________________________________
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
___________________________________________________________________________________

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

[Hans Hagen]

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
___________________________________________________________________________________

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

[Mikael P. Sundqvist]

On Fri, Jun 2, 2017 at 4:24 PM, Hans Hagen <pragma@wxs.nl> 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
___________________________________________________________________________________
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
___________________________________________________________________________________

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

[Hans Hagen]

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
___________________________________________________________________________________

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

[Mikael P. Sundqvist]

On Fri, Jun 2, 2017 at 5:56 PM, Hans Hagen <pragma@wxs.nl> 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
___________________________________________________________________________________
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
___________________________________________________________________________________