On Tue, 7 Aug 2018, Alan Braslau wrote:

Hello,

You can also use MetaPost to render math stackers, rather than relying on TeX constructs and any particular font.

For example:


\useMPlibrary[mat]

\definemathstackers
  [mp]
  [alternative=mp]

\definemathextensible [mp] [leftarrow]          ["2190]
\definemathextensible [mp] [rightarrow]         ["2192]
\definemathextensible [mp] [leftrightarrow]     ["2194]
\definemathextensible [mp] [longleftrightarrow] ["27F7]
\definemathextensible [mp] [rightoverleftarrow] ["21C4]
\definemathextensible [mp] [underbrace]         ["FE3DF]

\setupbodyfont [dejavu-condensed,12pt]

\starttext
$\rightarrow{≠a}$
\stoptext



Furthermore, the MP arrow can be tuned

\startMPinitializations

ahlength := .5EmWidth ;
ahvariant := 1 ; % dimpled straight

\stopMPinitializations

as can line widths, etc.

Shouldn't we use a dedicated MP instance for stackers?

Aditya
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