[NTG-context] upload

30 Dec 2021

      Hi,

I pploaded a new lmtx (no rpi 64 bins yet, one can pick these up from 
the build in a few days).

Apart from a few fixes (older side float issue, some recent special rule 
related things) the only new thing is 'low level anchoring'. More can be 
found in ontarget.pdf (ontarget-anchoring.tex). It basically boils down 
to boxes listening to source, target and anchor keys, as in:

\vbox
     source 123
     \bgroup
         \offinterlineskip
         \blackrule[width=4cm,height=2cm,depth=0cm,color=darkred]\par
         \blackrule[width=4cm,height=0cm,depth=1cm,color=darkblue]\par
         \setbox\scratchboxtwo\hbox
             anchors "0004 "0001
           % anchor "00040001
             target 123
             orientation 1
             {\blackrule[width=2cm,height=1cm,depth=0cm,color=darkgreen]%
              \hskip-2cm
              \blackrule[width=2cm,height=0cm,depth=1cm,color=darkyellow]}%
           %
         \smash{\box\scratchboxtwo}%
     \egroup

the mentioned document describes a bit higher interface (plugs into 
layers) .. all kind of experimental and meant as teaser for users who 
like low level stuff (playground).

I also made it possible to use context \frules with leaders as in:

test \leaders \frule height 6mm depth 3mm radius 1mm\hfill test

\startuseMPgraphic{demoleader}
     fill
         unitcircle xysized (RuleWidth,RuleHeight+RuleDepth)
         withcolor RuleColor ;
\stopuseMPgraphic

test {\red \leaders \frule
     height 6mm
     depth  3mm
     type    mp
     data    {\includeMPgraphic{demoleader}}
\hfill} test

\startuseMPgraphic{demoleader}
     drawdblarrow (0,RuleHeight) -- (RuleWidth,RuleHeight)
         withpen pencircle scaled  RuleThickness
         withcolor RuleColor ;
\stopuseMPgraphic

test {\red \leaders \frule
     height  1mm % we need at least some dimensions
     type    mp
     line    1mm
     data    {\includeMPgraphic{demoleader}}
\hfill} test

(leaders can have boxes, rules and also glyphs)

In principle we can also have adaptive images (basically scaling) so I 
might make an example of that later (when i need it).

Of course I'll fix things I broke this time,

Hans

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