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authorHans Hagen <pragma@wxs.nl>2022-04-01 11:01:40 +0200
committerContext Git Mirror Bot <phg@phi-gamma.net>2022-04-01 11:01:40 +0200
commitc1224cc330e695938cfcf944f8e9d0c14c15fa8c (patch)
tree1ab4e67a616e7338f91cded3a0d803d61a185ea3 /doc
parent6a2738578157926c6ebd64048ddabb7d923b2be5 (diff)
downloadcontext-c1224cc330e695938cfcf944f8e9d0c14c15fa8c.tar.gz
2022-04-01 09:35:00
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-rw-r--r--doc/context/sources/general/manuals/ontarget/ontarget-math.tex54
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