Am 03.01.2009 um 15:02 schrieb Thomas A. Schmitz:
Hi all,
first, best wishes for the New Year to all of you - may 2009 bring
peace and fortune and world domination for ConTeXt!
And my little question - trivial for the resident experts, I guess,
but I can't find a solution: I want to write a little macro that
will allow me to place a thin curved line under letters (metrical
symbol for synizesis). Now that metafun is so fast in mkiv, I
thought I'd use a MPpositiongraphic for that purpose, but my problem
is that I can't make the graphic really local - when it is used more
than once in a document, Metafin uses the last values for all
occurrences. I tried grouping and the "save" command, but to no
avail. Here's an example that shows the problem:
\startMPpositiongraphic{placesynizesis}
StartPage ;
begingroup ; save a ;
initialize_box(\MPpos{\MPvar{self}}) ;
numeric a ; a = ExHeight/6 ;
z1 = llxy ;
z2 = lrxy ;
z3 = 1/2[z1,z2] ;
z4 = ((x1 + 2a),(y1 - 2a)) ;
z5 = (x3, (y3 - 4a)) ;
z6 = ((x2 - 2a),(y2 - 2a)) ;
path syn ; syn := z4 .. z5 .. z6 ;
pickup pencircle scaled a ;
draw syn ;
anchor_box(\MPanchor{\MPvar{self}}) ;
endgroup ;
StopPage ;
\stopMPpositiongraphic%
\setMPpositiongraphic{POS}{placesynizesis}
\define[1]\synizesis
{\hpos{POS}{#1}}
\starttext
\switchtobodyfont[25pt]
test: \synizesis{au} and \synizesis{aeiou}
\stoptext
Any solution to this conundrum?
\newcount\synizesisnumber
\define[1]\synizesis
{\advance\synizesisnumber\plusone
\setMPpositiongraphic{POS-\number\synizesisnumber}{placesynizesis}
\hpos{POS-\number\synizesisnumber}{#1}}
Wolfgang
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