On Mar 5, 2009, at 2:39 PM, Aditya Mahajan wrote:
Currently, there is no such feature. Are you looking at the
functionality of the arcs package of latex? If so, it will be easy
to add it to ConTeXt. The main trouble is that the glyph for
\overarc is missing from the fonts. Arcs.sty takes the glyphs for
\frown and \smile, and scales them appropriately. An ugly solution,
but it looks ok if you are just placing it over one or two letters.
I had a similar wish a while ago and hacked something with a
MPpositiongraphic. It is certainly not very elegant, but IMHO better
than the LaTeX code you posted (scaling a glyph like that will look
ugly when you want to span more than just two letters). Wolfgang
Schuster supplied the neat trick with the counter. It is quite fast
when run with mkiv, but I suspect would be slow with mkii (and leave
quite a few .mp files behind). Maybe this can help:
\newcount\arcnumber
\startMPpositiongraphic{placeoverarc}
StartPage ;
begingroup ;
initialize_box(\MPpos{\MPvar{self}}) ;
numeric c ; c = ExHeight/6 ;
z1 = llxy ;
z2 = lrxy ;
z7 = 1/2[z1,z2] ;
z4 = ((x1 + 2*c), (y1 + 2*c)) ;
z5 = (x7, (y7 + 4*c)) ;
z6 = ((x2 - 2*c), (y2 + 2*c)) ;
path syn ; syn := z4 .. z5 .. z6 ;
pickup pencircle scaled (0.75*c) ;
draw syn ;
anchor_box(\MPanchor{\MPvar{self}}) ;
endgroup ;
save c ;
StopPage ;
\stopMPpositiongraphic%
\define[1]\overarc
{\advance\arcnumber\plusone%
\setMPpositiongraphic{POS-\number\arcnumber}{placeoverarc}%
\hpos{POS-\number\arcnumber}{#1}}
Maybe that can be the starting point for some better code...
Thomas
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