Hello Hans,The macro to draw a vector does not work even with the
latest version of context standalone.
Thank you
Fabrice
\useMPlibrary[mat]
% will be in meta-imp-mat.mkiv
\startMPextensions
vardef math_stacker_arrow_shape =
image (
drawarrow
(OverlayWidth,OverlayOffset) -- (0,OverlayOffset)
withcolor
OverlayLineColor ;
setbounds currentpicture to boundingbox currentpicture
bottomenlarged (OverlayOffset/2) topenlarged (OverlayOffset/2) ;
)
enddef ;
vardef math_stacker_leftarrow_shape =
math_stacker_arrow_shape
enddef ;
vardef math_stacker_rightarrow_shape =
math_stacker_arrow_shape rotated 180
enddef ;
\stopMPextensions
\startuniqueMPgraphic{math:stacker:\number"2190}
math_stacker_draw(math_stacker_leftarrow_shape) ;
\stopuniqueMPgraphic
\startuniqueMPgraphic{math:stacker:\number"2192}
math_stacker_draw(math_stacker_rightarrow_shape) ;
\stopuniqueMPgraphic
% so far
\setupmathstackers
[both] % vfenced]
[color=darkred,
alternative=mp]
\setupmathstackers
[top]
[color=darkred,
alternative=mp]
\setupmathstackers
[bottom]
[color=darkred,
alternative=mp]
\starttext
$\overbracket {a+b+c+d} \quad \underbracket{a+b+c+d} \quad
\doublebracket{a+b+c+d}$ \blank
$\overparent{a+b+c+d} \quad \underparent {a+b+c+d} \quad
\doubleparent {a+b+c+d}$ \blank
$\overbrace {a+b+c+d} \quad \underbrace {a+b+c+d} \quad
\doublebrace {a+b+c+d}$ \blank
$\overbar {a+b+c+d} \quad \underbar{a+b+c+d} \quad
\doublebar{a+b+c+d}$ \blank
$\overleftarrow {a+b+c+d} \quad \overrightarrow {a+b+c+d} $ \blank
$\underleftarrow {a+b+c+d} \quad \underrightarrow {a+b+c+d} $ \blank
\stoptext
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