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Diffstat (limited to 'doc/context/sources/general/manuals/luametatex/luametatex-math.tex')
| -rw-r--r-- | doc/context/sources/general/manuals/luametatex/luametatex-math.tex | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/doc/context/sources/general/manuals/luametatex/luametatex-math.tex b/doc/context/sources/general/manuals/luametatex/luametatex-math.tex index 7f77bbd6d..6ae648e34 100644 --- a/doc/context/sources/general/manuals/luametatex/luametatex-math.tex +++ b/doc/context/sources/general/manuals/luametatex/luametatex-math.tex @@ -1096,7 +1096,35 @@ with in the engine). The full list of flags is given in the next table: \LL \stoptabulate -The effect can depend on the font (and for Cambria one can use for instance \type {"16}). +The effect can depend on the font (and for Cambria one can use for instance \type +{"16}). + +Sometimes you might want to act upon the size of a delimiter, something that is +not really possible because of the fact that they are calculated {\em after} most +has been typeset already. In the following example the all|-|zero specification +is the trigger to make a fake box with the last delimiter dimensions and shift. +It's an ugly hack but its relative simple and not intrusive implementation has no +side effects. Any other heuristic solution would not satisfy possible demands +anyway. Here is a rather low level example: + +\startbuffer +\startformula +\Uleft \Udelimiter 5 0 "222B +\frac{\frac{a}{b}}{\frac{c}{d}} +\Uright \Udelimiter 5 0 "222B +\kern-2\fontcharwd\textfont0 "222B +\mathlimop{\Uvextensible \Udelimiter 0 0 0}_1^2 x +\stopformula +\stopbuffer + +\typebuffer + +The last line, by passing zero values, results in a fake operator that has the +dimensions of the previous delimiter. We can then backtrack over the (presumed) +width and the two numbers become limit operators. As said, it's not pretty but it +works. + +\getbuffer \subsection[mathacc]{Accent handling with \lpr {Umathaccent}} |