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%D \module
%D   [       file=meta-mat,
%D        version=2013.07.19,
%D          title=\METAPOST\ Graphics,
%D       subtitle=Math,
%D         author=Hans Hagen,
%D           date=\currentdate,
%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

% A few accents:
%
% / for cambria

%D We need this for Alan, who nests math in \METAPOST:

\unprotect

\setupmathstackers
  [\c!mp=minifun::math:stacker:\number\scratchunicode]

\protect

\startMPextensions
    vardef math_stacker_bracket_shape(expr delta, rotate) =
        image (
            draw
                (0,OverlayOffset) --
                (0,delta-OverlayOffset) --
                (OverlayWidth,delta-OverlayOffset) --
                (OverlayWidth,OverlayOffset)
            withcolor
                OverlayLineColor ;
            setbounds currentpicture to boundingbox currentpicture bottomenlarged OverlayOffset ;
            if rotate :
                currentpicture := currentpicture rotated 180 ;
            fi ;
        )
    enddef ;
    vardef math_stacker_parent_shape(expr delta, rotate) =
        image (
            draw
                (0,OverlayOffset) ...
                (OverlayWidth/2,delta-OverlayOffset) ...
                (OverlayWidth,OverlayOffset)
            withcolor
                OverlayLineColor ;
            setbounds currentpicture to boundingbox currentpicture bottomenlarged OverlayOffset ;
            if rotate :
                currentpicture := currentpicture rotated 180 ;
            fi ;
        )
    enddef ;
    vardef math_stacker_brace_shape(expr delta, rotate) =
        image (
            draw
                (0,OverlayOffset) ...
                (OverlayWidth/4-OverlayOffset,delta-OverlayOffset) ...
                (OverlayWidth/2-OverlayOffset,delta-OverlayOffset) ...
                (OverlayWidth/2,delta) &
                (OverlayWidth/2,delta) ...
                (OverlayWidth/2+OverlayOffset,delta-OverlayOffset) ...
                (3OverlayWidth/4+OverlayOffset,delta-OverlayOffset) ...
                (OverlayWidth,OverlayOffset)
            withcolor
                OverlayLineColor ;
            setbounds currentpicture to boundingbox currentpicture bottomenlarged OverlayOffset ;
            if rotate :
                currentpicture := currentpicture rotated 180 ;
            fi ;
        )
    enddef ;
    vardef math_stacker_bar_shape(expr rotate) =
        image (
            draw
                (0,OverlayOffset) -- (OverlayWidth,OverlayOffset)
            withcolor
                OverlayLineColor ;
            setbounds currentpicture to boundingbox currentpicture bottomenlarged OverlayOffset ;
            if rotate :
                currentpicture := currentpicture rotated 180 ;
            fi ;
        )
    enddef ;
    % arrows
    vardef math_stacker_arrow_shape(expr axis, ex, em, rotate) =
        image (
            interim ahlength := ex/2;
            drawarrow
                ((OverlayWidth,ex/2) -- (0,ex/2))
            withcolor
                OverlayLineColor ;
            setbounds currentpicture to unitsquare xysized(OverlayWidth,ex) ;
            if rotate :
                currentpicture := currentpicture rotated 180 ;
            fi ;
        )
    enddef ;
    vardef math_stacker_leftrightarrow_shape(expr axis, ex, em, rotate) =
        image (
            interim ahlength := ex/2;
            drawdblarrow
                ((OverlayWidth,ex/2) -- (0,ex/2))
            withcolor
                OverlayLineColor ;
            setbounds currentpicture to unitsquare xysized(OverlayWidth,ex) ;
            if rotate :
                currentpicture := currentpicture rotated 180 ;
            fi ;
        )
    enddef ;
    vardef math_stacker_rightoverleftarrow_shape(expr axis, ex, em, rotate) =
        image (
            interim ahlength := ex/2;
            drawdoublearrows
                ((OverlayWidth,ex/2) -- (0,ex/2))
            withcolor
                OverlayLineColor ;
            setbounds currentpicture to unitsquare xysized(OverlayWidth,ex) ;
            if rotate :
                currentpicture := currentpicture rotated 180 ;
            fi ;
        )
    enddef ;

    % main handler

    def math_stacker_draw_accent(expr p) =
        draw p withpen pencircle scaled OverlayLineWidth xyscaled (2,3) rotated 45 ;
    enddef ;

    def math_stacker_draw_arrow(expr p) =
        draw p withpen pencircle scaled OverlayLineWidth ;
    enddef ;
\stopMPextensions

\startuniqueMPgraphic{minifun::math:stacker:\number"FE3B4}{axis,ex,em}
    math_stacker_draw_accent(math_stacker_bracket_shape(OverlayHeight,false)) ;
\stopuniqueMPgraphic

\startuniqueMPgraphic{minifun::math:stacker:\number"FE3B5}{axis,ex,em}
    math_stacker_draw_accent(math_stacker_bracket_shape(OverlayDepth,true)) ;
\stopuniqueMPgraphic

\startuniqueMPgraphic{minifun::math:stacker:\number"FE3DC}{axis,ex,em}
    math_stacker_draw_accent(math_stacker_parent_shape(OverlayHeight,false)) ;
\stopuniqueMPgraphic

\startuniqueMPgraphic{minifun::math:stacker:\number"FE3DD}{axis,ex,em}
    math_stacker_draw_accent(math_stacker_parent_shape(OverlayDepth,true)) ;
\stopuniqueMPgraphic

\startuniqueMPgraphic{minifun::math:stacker:\number"FE3DE}{axis,ex,em}
    math_stacker_draw_accent(math_stacker_brace_shape(OverlayHeight,false)) ;
\stopuniqueMPgraphic

\startuniqueMPgraphic{minifun::math:stacker:\number"FE3DF}{axis,ex,em}
    math_stacker_draw_accent(math_stacker_brace_shape(OverlayDepth,true)) ;
\stopuniqueMPgraphic

\startuniqueMPgraphic{minifun::math:stacker:\number"FE33E}{axis,ex,em}
    math_stacker_draw_accent(math_stacker_bar_shape(false)) ;
\stopuniqueMPgraphic

\startuniqueMPgraphic{minifun::math:stacker:\number"FE33F}{axis,ex,em}
    math_stacker_draw_accent(math_stacker_bar_shape(true)) ;
\stopuniqueMPgraphic

\startuniqueMPgraphic{minifun::math:stacker:\number"2190}{axis,ex,em}
    math_stacker_draw_arrow(math_stacker_arrow_shape(\MPvar{axis},\MPvar{ex},\MPvar{em},false)) ;
\stopuniqueMPgraphic

\startuniqueMPgraphic{minifun::math:stacker:\number"2192}{axis,ex,em}
    math_stacker_draw_arrow(math_stacker_arrow_shape(\MPvar{axis},\MPvar{ex},\MPvar{em},true)) ;
\stopuniqueMPgraphic

\startuniqueMPgraphic{minifun::math:stacker:\number"2194}{axis,ex,em}
    math_stacker_draw_arrow(math_stacker_leftrightarrow_shape(\MPvar{axis},\MPvar{ex},\MPvar{em},false)) ;
\stopuniqueMPgraphic

\startuniqueMPgraphic{minifun::math:stacker:\number"27F7}{axis,ex,em}
    math_stacker_draw_arrow(math_stacker_leftrightarrow_shape(\MPvar{axis},\MPvar{ex},\MPvar{em},false)) ;
\stopuniqueMPgraphic

\startuniqueMPgraphic{minifun::math:stacker:\number"21C4}{axis,ex,em}
    math_stacker_draw_arrow(math_stacker_rightoverleftarrow_shape(\MPvar{axis},\MPvar{ex},\MPvar{em},false)) ;
\stopuniqueMPgraphic

%D Radicals:

\startMPextensions
    vardef math_radical_simple(expr w,h,d,o) =
        (-h/2-o,h/2-o) --
        (-h/4-o,-d-o)  --
        (-o,h+o)       --
        (w+o,h+o)      --
        (w+o,h-h/10+o)
    enddef ;
\stopMPextensions

\startuniqueMPgraphic{minifun::math:radical:default}{axis,ex,em}
    draw
        math_radical_simple(OverlayWidth,OverlayHeight,OverlayDepth,OverlayOffset)
        withpen pencircle xscaled (2OverlayLineWidth) yscaled (3OverlayLineWidth/4) rotated 30
      % dashed evenly
        withcolor OverlayLineColor ;
\stopuniqueMPgraphic

\continueifinputfile{meta-imp-mat.mkiv}

\setupmathstackers [both]   [color=darkred,alternative=mp]
\setupmathstackers [top]    [color=darkred,alternative=mp]
\setupmathstackers [bottom] [color=darkred,alternative=mp]

\startTEXpage[offset=10pt]

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\stopTEXpage