From: Hans Hagen <pragma@wxs.nl>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: \getscaledglyph for width-only
Date: Fri, 19 Aug 2016 00:11:14 +0200 [thread overview]
Message-ID: <3390c0eb-14e3-93f6-cd74-f5246c4253b3@wxs.nl> (raw)
In-Reply-To: <alpine.BSO.2.20.1608180755280.18513@firefly.landy.cx>
On 8/18/2016 6:30 PM, Brian R. Landy wrote:
>
>
> On Thu, 18 Aug 2016, Hans Hagen wrote:
>
>> On 8/18/2016 1:12 AM, Brian R. Landy wrote:
>>>
>>>> On Aug 17, 2016, at 5:45 PM, Hans Hagen <pragma@wxs.nl> wrote:
>>>>
>>>> On 8/17/2016 9:56 PM, Brian R. Landy wrote:
>>>>> Hi, I was wondering if there is a way to call \getscaledglyph to
>>>>> scale a
>>>>> glyph only horizontally, leaving the height untouched? Or maybe an
>>>>> alternate command?
>>>>>
>>>>> I can sort of accomplish this with (for example)
>>>>> \scale[sx=0.75,sy=1.0]{}{A}, but that encloses the glyph in an \hbox,
>>>>> which can be problematic. \getscaledglyph doesn't cause me any
>>>>> problems, except that it scales the height too.
>>>>
>>>> \starttext
>>>>
>>>> \definefontfeature[whatever][default][extend=2.5]
>>>>
>>>> \definedfont[Serif*whatever at 12pt]
>>>>
>>>> whatever
>>>>
>>>> \stoptext
>>>>
>>>
>>> Thank you. One thing that \getscaledglyph does it works agnostic to
>>> the currently selected font. For example:
>>
>> scaling glyphs in one direction is kind of bad anyway so if you want
>> just one glyph you can do
>>
>> \inframed{\scale[width=3em,height=1ex]{...}}
>>
>> or whatever suits the purpose
>
> Agreed. Here's a little more background, so it makes some sense why I
> want to scale horizontally, and then I describe my final solution. I
> have a specific case where I use a minus, a hyphen-minus, and a plus
> close to each other, and it's always bugged me that most fonts don't
> vertically align the hyphen-minus with the other two glyphs. An example is:
>
> {\normalUchar"2212}100-00+
>
> I was thinking that math fonts did align these symbols, hence my
> question on Monday on how to get the hyphen-minus in math mode (and
> thanks for the quick answer on that) but unfortunately was wrong. So
> that got me searching for a way to horizontally shrink a minus, so it
> would retain the same height and line thickness as the minus.
> Horizontal-only scaling of a hyphen/dash/minus isn't so bad.
>
> \scaled[] worked perfectly, but it breaks inside a natural table with
> character alignment enabled. I have a commented example of this below.
> \getscaledglyph works in the table, but the vertical shrink is a
> non-starter.
>
> Here's an example:
>
> \edef\mathminus{\normalUchar"2212}
> \edef\smallminus{\getscaledglyph{0.33}{}{\normalUchar"2212}}
> \starttext
>
> This is my starting point:
>
> \bTABLE[aligncharacter=yes,alignmentcharacter={text->-}]
> \bTR \bTD \mathminus100-00+ \eTD \eTR
> \bTR \bTD 100-00 \eTD \eTR
> \bTR \bTD \mathminus 99-00+ \eTD \eTR
> \bTR \bTD \mathminus 99-00 \eTD \eTR
> \eTABLE
>
> % This table won't typeset:
> %
> % \bTABLE[aligncharacter=yes,alignmentcharacter={text->:}]
> % \bTR \bTD \mathminus100\scaled[sx=0.5,sy=1.0]{\mathminus}00:+ \eTD \eTR
> % \bTR \bTD 100\scaled[sx=0.5,sy=1.0]{\mathminus}00: \eTD \eTR
> % \bTR \bTD \mathminus 99\scaled[sx=0.5,sy=1.0]{\mathminus}00:+ \eTD \eTR
> % \bTR \bTD \mathminus 99\scaled[sx=0.5,sy=1.0]{\mathminus}00: \eTD \eTR
> % \eTABLE
>
> \stoptext
>
> But I came up with a solution that works. Rather than attempt to shrink
> the minus glyph, I define a new glyph that corrects the height of the
> hyphen-minus:
>
> \startluacode
> local function addsmallminus(tfmdata)
> local hchar = tfmdata.characters[0x002D]
> local mchar = tfmdata.characters[0x2212]
> tfmdata.characters[0xFE000] = {
> width = hchar.width,
> height = mchar.height,
> commands = {
> { "down", hchar.height-mchar.height },
> { "char", 0x002D },
> }
> }
> end
>
> fonts.constructors.newfeatures("otf").register {
> name = "smallminus",
> description = "small minus",
> manipulators = {
> base = addsmallminus,
> node = addsmallminus,
> }
> }
>
> \stopluacode
>
> \definefontfeature[default][default][smallminus=yes]
> \edef\smallminus{\normalUchar"FE000}
>
> \starttext
>
> \bTABLE[aligncharacter=yes,alignmentcharacter={text->\smallminus}]
> \bTR \bTD \mathminus100\smallminus00+ \eTD \eTR
> \bTR \bTD 100\smallminus00 \eTD \eTR
> \bTR \bTD \mathminus 99\smallminus00+ \eTD \eTR
> \bTR \bTD \mathminus 99\smallminus00 \eTD \eTR
> \eTABLE
>
> \stoptext
>
> So this looks good and works with any font. The only issue is fonts
> that use a different line thickness for the minus and hyphen-minus; this
> top-aligns the glyphs.
>
> Is there a way to make this glyph available in math-mode? I get a "?"
> when I try:
method 1:
\definefontfeature[math-text] [math-text] [smallminus=yes]
\definefontfeature[math-script] [math-script] [smallminus=yes]
\definefontfeature[math-scriptscript] [math-scriptscript] [smallminus=yes]
method 2: (no need to adapt features)
name = "smallminus",
description = "small minus",
default = true,
> \math{\smallminus}
> \math{\mathchar"FE000}
>
> Thanks for all your help!
>
>
> Brian
> ___________________________________________________________________________________
>
> 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://tex.aanhet.net
> archive : http://foundry.supelec.fr/projects/contextrev/
> wiki : http://contextgarden.net
> ___________________________________________________________________________________
--
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Hans Hagen | PRAGMA ADE
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___________________________________________________________________________________
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
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archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
next prev parent reply other threads:[~2016-08-18 22:11 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-17 19:56 Brian R. Landy
2016-08-17 21:45 ` Hans Hagen
2016-08-17 23:12 ` Brian R. Landy
2016-08-18 8:20 ` Hans Hagen
2016-08-18 16:30 ` Brian R. Landy
2016-08-18 22:11 ` Hans Hagen [this message]
2016-08-20 11:53 ` Hans Hagen
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