On 6-8-2010 12:32, Philipp Gesang wrote:

Hi all!

[1] Is there a Lua interface for metapost? I'm thinking of something like cld is for TeX here. All I figured out so far is how to generate mp code (as strings) in Lua and then having it processed by mplib, but as the metafun manual is from 2002 and with context you never know how far it is ahead of your dreams …

[1a] If not [1], then: will there ever be something like this?

[2] There's an example for “metapost.process()” in mlib-ctx.mkiv but I can't get it to work. I simply copypasted it as follows:

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\starttext \startluacode mpgraphic = [[ for i=1 upto 1000 : beginfig(0); draw halfcircle scaled 1cm withcolor green ; picture p ; p := "oeps" infont defaultfont scaled .75 rotated 45 ; p := p shifted - (xpart center p,0) ; draw p ; draw boundingbox p ; endfig ; beginfig(0); draw halfcircle scaled 1cm dashed evenly withcolor green ; endfig ; beginfig(0); pickup pencircle xscaled .5mm yscaled .25mm rotated 45 ; draw halfcircle scaled 1cm withcolor red ; endfig ; beginfig(0); draw halfcircle scaled 1cm ; endfig ; beginfig(0); pickup pencircle xscaled .5mm yscaled .25mm rotated 45 ; for k:=1 upto 10 : draw halfcircle scaled uniformdeviate(1cm) withcolor (red/(k/4)) ; endfor ; endfig ; endfor ; ]] metapost.process(metapost.format("metafun"),mpgraphic) \stopluacode

\stoptext

how about: \starttext \startluacode context.startMPcode() context("draw fullcircle scaled 10cm;") context.stopMPcode() context.resetMPdrawing() context.startMPdrawing() context("fill fullcircle scaled 10cm;") context.stopMPdrawing() for i=1,100,5 do context.startMPdrawing() context("draw fullcircle scaled " ..i .. "mm withcolor white;") context.stopMPdrawing() end context.MPdrawingdonetrue() context.getMPdrawing() \stopluacode \stoptext ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------