On 5/26/2017 12:53 PM, Fabrice Couvreur wrote:
Hello,
Hans suggested a macro to draw the vectors . It works well but I find
that in some situations, the arrow is too big.
thank you,
interim ahlength := 2;
Fabrice
https://mailman.ntg.nl/pipermail/ntg-context/2016/085828.html
\useMPlibrary[mat]
\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
$\overrightarrow {i}$
\stoptext
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Hans Hagen | PRAGMA ADE
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