metapost and lua

metapost and lua

[Philipp Gesang]

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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:

···8<··········································································

\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

···8<··········································································

        This fails in mlib-run.lua at line 324. (Same with all my other
        tries, but I assume code from the context sources has a much
        higher probability of being valid.) Do I miss something critical?

Thanks for your help,

Philipp

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Re: metapost and lua

[Hans Hagen]

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

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

it's on my agenda to look into 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:

i have no time now, but remind me to make an example

Hans


-----------------------------------------------------------------
                                           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
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: metapost and lua

[Hans Hagen]

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:
>
> ···8<··········································································
>
> \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
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: metapost and lua

[Hans Hagen]

Hi,

I've added \MPdrawing and \MPcode so that less calls are needed

for i=1,100,5 do
     context.MPdrawing("draw fullsquare scaled " ..i .. "mm withcolor 
white;")
end

Hans


-----------------------------------------------------------------
                                           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
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: metapost and lua

[Philipp Gesang]

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On 2010-08-06 <13:34:20>, Hans Hagen wrote:
> 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

That's more or less what I'm doing right now; I was being curious about
the “metapost.process(etc)” function, especially concerning the first
argument: “mpx” -- what could be a valid format identifier besides
"metafun"? Why does it fail on the otherwise sound example from
mlib-ctx.mkiv? It's nothing urgent, just plain curiosity.

Philipp


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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: metapost and lua

[Philipp Gesang]

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On 2010-08-06 <13:44:14>, Hans Hagen wrote:
> Hi,
> 
> I've added \MPdrawing and \MPcode so that less calls are needed

Great! Many thanks for this. 
Philipp

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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________