Re: [NTG-context] Fwd: Macro to write a vector (Metafun) is broken

22 Mar 2018


      ...
---------- Forwarded message ----------
From: Fabrice Couvreur 
Date: Tue, Mar 20, 2018 at 4:29 PM
Subject: [NTG-context] Macro to write a vector (Metafun) is broken
To: mailing list for ConTeXt users 
Hello Hans,
The macro you wrote to draw the arrows of the vectors does not seem to
work anymore.
Thank you
Fabrice
Did you check ou tthe latest meta-imp file? Alan and I added more and 
also changed the interface a little which might have consequences.
...
\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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