Re: new upload

[Hans Hagen <j.hagen@xs4all.nl>]

On 5/31/2021 9:04 PM, Aditya Mahajan wrote:
> On Mon, 31 May 2021, Hans Hagen wrote:
> 
>> On 5/31/2021 6:50 PM, Aditya Mahajan wrote:
>>> On Mon, 31 May 2021, Hans Hagen wrote:
>>>
>>>> Hi,
>>>>
>>>> I uploaded a new lmtx version. This time a new mechanism.
>>>
>>> This is very interesting...I haven't played around with it, but is it the
>>> case that \markanchor does not do alignment and so can completely replace
>>> the old \hpos{...} class of macros?
>>>
>>> This also gives many interesting possibilities for math .... drawing "boxes"
>>> in matrices (e.g.,
>>> https://tex.stackexchange.com/questions/333011/draw-a-box-around-matrix-elements)
>>> or even the nath style `\wall` macro (see pg 11 of
>>> https://texdoc.org/serve/nathguide.pdf/0) ... Of course, I mean this in
>>> terms of the visual effect and not the interface.
>> Like this ... I'll think about taking some size into account (a bit like hpos
>> does).
> 
> Yes! If we can take size of cell into account, it will be perfect.
> 
> We can also think of a wrapper so that an explicit \framed is not needed.
new upload with nesxt step

\starttext

\startuseMPgraphic{whatever-5}
     fill OverlayBox withcolor "lightgray" ;
     draw matrixbox (1, 1) (2, 1) withpen pencircle scaled 1pt withcolor 
"blue" ;
     draw matrixbox (2, 2) (4, 4) withpen pencircle scaled 1pt withcolor 
"red" ;
%     drawdot anchorxy("matrix", 3, 4) withpen pencircle scaled 4pt 
withcolor "green";
     setbounds currentpicture to OverlayBox ;
\stopuseMPgraphic

\defineoverlay[whatever-5][\useMPgraphic{whatever-5}]

\framed
   [synchronize=background,
    align=normal,
    frame=off,
    background=whatever-5]
   {\setmathmatrixanchoring[both]% left|right|both|yes
%   {\setmathmatrixanchoring[right]% left|right|both|yes
    \startmathmatrix
       \NC a1 \NC a   \NC b   \NC c\NR
       \NC a2 \NC a   \NC b   \NC c\NR
       \NC a3 \NC a^2 \NC b   \NC c\NR
       \NC a4 \NC a   \NC b_2 \NC c\NR
       \NC a5 \NC a   \NC b   \NC c\NR
       \NC a6 \NC a   \NC b   \NC c\NR
   \stopmathmatrix}

\blank

\startuseMPgraphic{whatever-5}
     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" ;
     setbounds currentpicture to OverlayBox ;
\stopuseMPgraphic

\framed
   [synchronize=background,
    align=normal,
    frame=off,
    background=whatever-5,
    backgroundoffset=.5ex,
    foregroundcolor=white]
   {\setmathmatrixanchoring[yes]% left|right|both|yes
    \startmathmatrix
       \NC a1 \NC a   \NC b   \NC c\NR
       \NC a2 \NC a   \NC b   \NC c\NR
       \NC a3 \NC a^2 \NC b   \NC c\NR
       \NC a4 \NC a   \NC b_2 \NC c\NR
       \NC a5 \NC a   \NC b   \NC c\NR
       \NC a6 \NC a   \NC b   \NC c\NR
   \stopmathmatrix}

\stoptext

as a side track / distraction I added italic correction prevention, as 
shown in:

\starttext

\startTEXpage[offset=10pt] \showglyphs
     \startcombination[nx=3,ny=1]
         \startcontent \framed[strut=no,align=normal,offset=1ex]\bgroup 
\showmakeup[math,kern]%
             $a = b + c$\par
             $b = c + d$\par
             $c = e + f$\par
         \egroup \stopcontent
         \startcaption
             italic correction
         \stopcaption
         \startcontent \framed[strut=no,align=normal,offset=1ex]\bgroup 
\showmakeup[math,kern]%
             \noitaliccorrection
             $a = b + c$\par
             $b = c + d$\par
             $c = e + f$\par
         \egroup \stopcontent
         \startcaption
             no italic correction
         \stopcaption
         \startcontent \framed[strut=no,align=normal,offset=1ex]\bgroup 
\showmakeup[math,kern]%
             $a = b + c$\par
             $\noitaliccorrection b = c + d$\par
             $c = e + f$\par
         \egroup \stopcontent
         \startcaption
             selected correction
         \stopcaption
     \stopcombination
\stopTEXpage

\stoptext

but of course different width are still a reason why this doesn't align

Hans

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                                           Hans Hagen | PRAGMA ADE
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