diff options
Diffstat (limited to 'doc/context/sources/general/manuals/luametatex/luametatex-math.tex')
| -rw-r--r-- | doc/context/sources/general/manuals/luametatex/luametatex-math.tex | 27 |
1 files changed, 13 insertions, 14 deletions
diff --git a/doc/context/sources/general/manuals/luametatex/luametatex-math.tex b/doc/context/sources/general/manuals/luametatex/luametatex-math.tex index 1227e7573..02f5f8c71 100644 --- a/doc/context/sources/general/manuals/luametatex/luametatex-math.tex +++ b/doc/context/sources/general/manuals/luametatex/luametatex-math.tex @@ -1118,28 +1118,27 @@ The effect can depend on the font (and for Cambria one can use for instance \typ 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: +has been typeset already. For this we have two keyword: \type {phantom} and +\type {void}. In both cases the symbol is replaced by an empty rule, in the first +case all three dimensions are preserved in the last case only the height and depth. \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 + x\mathlimop{\Uvextensible \Udelimiter 5 0 "222B}_1^2 x +\stopformula +\vskip-9ex +\startformula \red + x\mathlimop{\Uvextensible phantom \Udelimiter 5 0 "222B}_1^2 x +\stopformula +\vskip-9ex +\startformula \blue + x\mathlimop{\Uvextensible void \Udelimiter 5 0 "222B}_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. +In typeset form this looks like: \getbuffer |