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author | Hans Hagen <pragma@wxs.nl> | 2022-04-01 11:01:40 +0200 |
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committer | Context Git Mirror Bot <phg@phi-gamma.net> | 2022-04-01 11:01:40 +0200 |
commit | c1224cc330e695938cfcf944f8e9d0c14c15fa8c (patch) | |
tree | 1ab4e67a616e7338f91cded3a0d803d61a185ea3 /doc | |
parent | 6a2738578157926c6ebd64048ddabb7d923b2be5 (diff) | |
download | context-c1224cc330e695938cfcf944f8e9d0c14c15fa8c.tar.gz |
2022-04-01 09:35:00
Diffstat (limited to 'doc')
-rw-r--r-- | doc/context/sources/general/manuals/ontarget/ontarget-math.tex | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/doc/context/sources/general/manuals/ontarget/ontarget-math.tex b/doc/context/sources/general/manuals/ontarget/ontarget-math.tex index 361cbe2ba..99d8cb26a 100644 --- a/doc/context/sources/general/manuals/ontarget/ontarget-math.tex +++ b/doc/context/sources/general/manuals/ontarget/ontarget-math.tex @@ -1684,6 +1684,60 @@ also because you need to know a bit of \CONTEXT. \stopsubject +\startsubject[title=Tuned kerning] + +The \CONTEXT\ distribution has dedicated code for typesetting units that dates +back to the mid nineties of the previous century but was (code wise) upgraded +from \MKII\ to \MKIV\ which made it end up in the physics name space. There is +not much reason to redo that code but when we talk new spacing classes it might +make sense at some point to see if we can use less code for spacing by using a +\quote {unit} class. When Mikael pointed out that, for instance in Pagella: + +\startlinecorrection +\switchtobodyfont[pagella]\showglyphs +\scale[height=1cm]{\setmathoptions\mathdivisioncode\zerocount\m{m^3/s__2}} +\stoplinecorrection + +doesn't space well the obvious answer is: use the units mechanism because this +kind of rendering was why it was made in the first place. However, the question +is of course, can we do better anyway. The chosen solution uses a combination +of class options and tweaked shape kerning: + +\startlinecorrection +\switchtobodyfont[pagella]\showglyphs +\scale[height=1cm]{\m{m^3/s__2}} +\stoplinecorrection + +An example of a class setup in \CONTEXT\ is: + +\starttyping +\setmathoptions\mathdivisioncode\numexpr + \nopreslackclassoptioncode +\nopostslackclassoptioncode + +\lefttopkernclassoptioncode +\righttopkernclassoptioncode + +\leftbottomkernclassoptioncode +\rightbottomkernclassoptioncode +\relax +\stoptyping + +and, although we don't go into the details of tweaking here, this is the kind +if code you will find in the goodie file: + +\starttyping +{ + tweak = "kerns", + list = { + [0x2F] = { + topleft = -0.3, + bottomright = 0.2, + } + } +} +\stoptyping + +where the numbers are a percentage of the width. This specification translates in +a math staircase kerning recipe. + +\stopsubject + \startsubject[title=More font tweaks] Once you start looking into the details of these fonts you are likely to notice |