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).
\starttext
\startuseMPgraphic{whatever-1}
fill OverlayBox withcolor "lightgray" ;
drawdot anchorxy("one", 0, 1)
withpen pencircle scaled 1mm
withcolor "red" ;
drawdot anchorxy("one", 0, 2)
withpen pencircle scaled 1mm
withcolor "red" ;
drawdot anchorxy("two", 0, 1)
withpen pencircle scaled 1mm
withcolor "red" ;
drawdot anchorxy("two", 0, 2)
withpen pencircle scaled 1mm
withcolor "red" ;
drawdot anchorxy("three", 0, 1)
withpen pencircle scaled 1mm
withcolor "red" ;
setbounds currentpicture to OverlayBox ;
\stopuseMPgraphic
\startuseMPgraphic{whatever-2}
pair a ; a := anchorxy("one", 0, 1) ;
pair b ; b := anchorxy("one", 0, 2) ;
drawarrow
anchorxy("one", 0, 1) { right } ..
anchorxy("one", 0, 2)
withcolor "blue" withtransparency (1,.75) ;
drawarrow
anchorxy("two", 0, 1) { down } ..
anchorxy("two", 0, 2)
withcolor "blue" withtransparency (1,.75) ;
drawarrow
anchorxy("two", 0, 1) { dir 30 } ..
anchorxy("three", 0, 1)
withcolor "blue" withtransparency (1,.75) ;
setbounds currentpicture to OverlayBox ;
\stopuseMPgraphic
\defineoverlay[whatever-1][\useMPgraphic{whatever-1}]
\defineoverlay[whatever-2][\useMPgraphic{whatever-2}]
\framed
[synchronize=yes,
align=normal,
offset=10pt,
frame=off,
background={whatever-1,foreground,whatever-2}]
{\startmathmatrix
\NC \markanchor{two}{0}{1}a \NC b \NC c\NR
\NC a \NC b \NC c\NR
\NC a \NC \markanchor{one}{0}{1}b \NC c\NR
\NC \markanchor{one}{0}{2}a \NC b \NC \markanchor{two}{0}{2}c\NR
\NC a \NC \markanchor{three}{0}{1}b \NC c\NR
\stopmathmatrix}
\startuseMPgraphic{whatever-3}
pair a ; a := anchorxy("a", 0, 1) ;
pair b ; b := anchorxy("a", 0, 2) ;
draw boundingbox (a--b)
leftenlarged .25EmWidth
rightenlarged EmWidth
topenlarged StrutHeight
bottomenlarged .5StrutDepth
withcolor "blue" withtransparency (1,.75) ;
setbounds currentpicture to OverlayBox ;
\stopuseMPgraphic
\defineoverlay[whatever-3][\useMPgraphic{whatever-3}]
\framed
[synchronize=yes,
align=normal,
offset=10pt,
frame=off,
background=whatever-3]
{\startmathmatrix
\NC a \NC a \NC b \NC c\NR
\NC a \NC a \NC b \NC c\NR
\NC a \NC \markanchor{a}{0}{1}a \NC b \NC c\NR
\NC a \NC a \NC \markanchor{a}{0}{2}b \NC c\NR
\NC a \NC a \NC b \NC c\NR
\NC a \NC a \NC b \NC c\NR
\stopmathmatrix}
\stoptext
The \markanchor{a}{0}{1 can be wrapped in a simpler one, or we can have
something \markedanchor{a}{2}{b} but that need a little thinking because
we don't want to mess too much with math spacing. Actually we can
consider (in this case) \MC[a,2] or so although these are probabbly not
features used that often.
Hans
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Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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