On Tue, 18 Jan 2011, Verhaag, G.C.H.M. wrote:
Hi,
I wanted to try (using ConTeXt minimals MkIV) the example on page 228 of the MetaFun manual, dealing with typesetting in MetaPost.
I haven't look at the metapost manual ... but
The code is given as:
\resetMPdrawing \startMPdrawing picture pic[] ; numeric wid[], len[], pos[], n ; wid[0] := len[0] := pos[0] := n := 0 ; \stopMPdrawing
\def\whatever#1% {\appendtoks#1\to\MPtoks \setbox\MPbox=\hbox{\bfd\the\MPtoks}% \startMPdrawing n := n + 1 ; len[n] := \the\wd\MPbox ; \stopMPdrawing \startMPdrawing[-] pic[n] := textext("\bfd\setstrut\strut#1") ; pic[n] := pic[n] shifted - llcorner pic[n] ; \stopMPdrawing}
\handletokens MetaPost is Fun!\with\whatever
But is won't run. The following message is generated:
The actual error message said ! Undefined control sequence. \@@toks ->\MPtoks So add \newtoks\MPtoks After which you get ! Undefined control sequence. \whatever ...endtoks #1\to \MPtoks \setbox \MPbox so add \newbox\MPbox After that the file compiles but you get an empty image. There are two things missing in the code. First you don't tell actually draw the metapost drawing. for that, add \MPdrawingdonetrue \getMPdrawing \resetMPdrawing Still an empty page. Again the pic[n] is calculated but never drawn. So add draw p[n] shifted (n*1cm,0) ; (or perhaps along a more sophisticated path), and now you have a working example: \newtoks\MPtoks \newbox\MPbox \resetMPdrawing \startMPdrawing picture p[] ; numeric wid[], len[], pos[], n ; wid[0] := len[0] := pos[0] := n := 0 ; \stopMPdrawing \def\whatever#1% {\appendtoks#1\to\MPtoks \setbox\MPbox=\hbox{\bfd\the\MPtoks}% \startMPdrawing n := n + 1 ; len[n] := \the\wd\MPbox ; p[n] := textext("\bfd\setstrut\strut#1") ; p[n] := p[n] shifted - llcorner p[n] ; draw p[n] shifted (n*1cm,0) ; \stopMPdrawing} \starttext \handletokens MetaPost is Fun!\with\whatever \MPdrawingdonetrue \getMPdrawing \resetMPdrawing \stoptext You could also have just used the macros from meta-txt: \useMPlibrary[txt] \startMPdefinitions newpath RotPath ; RotPath = fullcircle scaled 3cm ; \stopMPdefinitions \starttext \followtokens{Metapost is fun \quad} \stoptext @Hans: Perhaps we can have a more ConTeXtist interface to this macro: \definetextonepath [whatever] [color=..., style=..., mp=..., % path specification ] \whatever{Metapost is fun} Aditya