![](https://secure.gravatar.com/avatar/d7c3317235884569312c31f786d43bbc.jpg?s=120&d=mm&r=g)
Thanks Hans
Fabrice
2017-05-27 0:09 GMT+02:00 Hans Hagen
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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