[NTG-context] new upload

4 Jun 2021

      Hi,

I uploaded a new version of lmtx: a next step in this matrix and such 
graphic part ... (also bTABLE done).

The matrix bit has a high level MP interface, also because it's a nice 
example of implementing one (not much code needed actually).

Support in bTABLE .. eTABLE is kind of interesting as it separates the 
ornamental part from the text part. The sxample only shows some simple 
stuff.  I'll probably also add this to the other table mechanisms. (Not 
hard but I don't want to impact performance when it's not used.)

The

   \startoverlayMPgraphic{mp:whatever-6}

is new and automatically defines the overlay so that saves some code.

   \startMPoverlaydata

is just a collector that can be flushed in-line (which wilkl also reset 
it).

All this is probably mostly useful in an educational setting. We'll see.

Hans

------------------------------------------------------------
examples
------------------------------------------------------------

\starttext

\startoverlayMPgraphic{mp:whatever-6}
     fill OverlayBox withcolor "darkgray" ;
     draw matrixbox (1, 1) (2, 1) enlarged OverlayOffset shifted 
paired(OverlayOffset) withpen pencircle scaled 1pt withcolor "blue" ;
     draw matrixbox (2, 2) (4, 4) enlarged OverlayOffset shifted 
paired(OverlayOffset) withpen pencircle scaled 1pt withcolor "red" ;
\stopoverlayMPgraphic

\framed
   [synchronize=background,
    align=normal,
    frame=off,
    background=mp:whatever-6,
    backgroundoffset=.5ex,
    foregroundcolor=white]
   {\setmathmatrixanchoring[yes]% left|right|both|yes
    \startmathmatrix
       \NC a_1 \NC a   \NC b   \NC c\NR
       \NC a_2 \NC a   \NC b   \NC c\NR
       \NC a_3 \NC a^2 \NC b   \NC c\NR
       \NC a_4 \NC a   \NC b_2 \NC c\NR
       \NC a_5 \NC a   \NC b   \NC c\NR
       \NC a_6 \NC a   \NC b   \NC c\NR
   \stopmathmatrix}

% \blank

% This can also be done by Alans node module.

\startoverlayMPgraphic{mp:whatever-7}
     fill OverlayBox withcolor "darkgray" ;
     draw lmt_matrix [
         from        = (1, 1),
         to          = (5, 4),
         connect     = { "bottom", "left"  },
         color       = "blue",
         linewidth   = 1pt,
         arrowoffset = 2pt,
         label       = [
             text     = "$\white \scriptscriptstyle x =1$",
             offset   = ExHeight/2,
             anchor   = "lft",
             fraction = .25
         ],
     ] ;
     draw lmt_matrix [
         from       = (4, 1),
         to         = (1, 5),
         connect    = { "bottom", "right" }
         colors     = { "green", "magenta" },
         arrowcolor = "white",
         linewidth  = 1pt,
     ] ;
     draw lmt_matrix [
         cell      = (2, 2),
         shape     = "circle"
         color     = "red",
         linewidth = 1pt,
     ] ;
     draw lmt_matrix [
         cell      = (4, 6),
         shape     = "round",
         radius    = ExHeight/2,
         color     = "red",
         linewidth = 1pt,
     ] ;
     draw lmt_matrix [
         cell      = (2, 6),
         shape     = "path",
         path      = fulldiamond xscaled 3EmWidth yscaled 4ExHeight,
         color     = "red",
         linewidth = 1pt,
     ] ;
     draw lmt_matrix [
         cell      = (2, 6),
         shape     = "scaledpath",
         offset    = .5ExHeight,
         path      = fulldiamond,
         color     = "yellow",
         linewidth = 1pt,
     ] ;
\stopoverlayMPgraphic

\blank

\framed
   [synchronize=background,
    align=normal,
    frame=off,
    offset=overlay,
    background=mp:whatever-7,
    foregroundcolor=white]
   {\setmathmatrixanchoring[both]%
    \startmathmatrix
       \NC a \NC   \NC \quad \NC b \NC   \NR
       \NC   \NC c \NC \quad \NC   \NC   \NR
       \NC   \NC   \NC \quad \NC   \NC   \NR
       \NC   \NC   \NC \quad \NC   \NC d \NR
       \NC e \NC   \NC \quad \NC   \NC   \NR
       \NC   \NC f \NC \quad \NC g \NC   \NR
   \stopmathmatrix}

\blank

\startoverlayMPgraphic{whatever-9}
     fill anchorspan (1, 1) (1, 3) withcolor "blue" ;
     fill anchorspan (2, 1) (3, 3) withcolor "yellow" ;
     fill anchorspan (3, 1) (3, 3) withcolor "green" ;
     path p ; p := anchorcell (2, 2) ;
     fill p withcolor "red" ;
     % now some weird stuff:
     picture q ; q := externalfigure "t:/sources/cow.pdf" ;
     q := q xysized (bbwidth(p), bbheight(p)) ;
     draw q shifted - center q shifted center p ;
     % and some even weirder stuff:
     \includeMPoverlaydata
\stopoverlayMPgraphic

\enabletrackers[localanchor]

\bTABLE[frame=off,synchronize=background,background=whatever-9]
     \bTR
         \bTD[foregroundcolor=white]
             \startMPoverlaydata
                 fill anchorcell (\xanchor,\yanchor) enlarged 
-.25ExHeight withcolor "darkgray" ;
             \stopMPoverlaydata
             test
         \eTD
         \bTD
             test test
         \eTD
         \bTD
             test test test
         \eTD
     \eTD
     \bTR
         \bTD[foregroundcolor=white]
             test test
         \eTD
         \bTD[nx=2,align=middle,foregroundstyle=bold,foregroundcolor=white]
             test
         \eTD
     \eTD
     \bTR
         \bTD[foregroundcolor=white]
             test test test
         \eTD
         \bTD
             test test
         \eTD
         \bTD
             test
         \eTD
     \eTD
\eTABLE

\stoptext

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