Re: [NTG-context] Passing data back and forth between metapost and lua

19 Mar 2017


      On 3/19/2017 7:29 PM, Aditya Mahajan wrote:
...
On Sun, 19 Mar 2017, Aditya Mahajan wrote:
...
On Tue, 20 Dec 2016, Alan Braslau wrote:
...
On Mon, 19 Dec 2016 08:19:25 -0800
Aditya Mahajan  wrote:
...
The ability to pass parameters to metapost has been around since the
beginning. See the metafun manual for details (search for MPvar).
Hans has developed tools making it quite easy to pass data back and
forth between MetaPost and lua. This is quite efficient, and it is
being used more and more in the development of macro functionality.
I finally need to write a macro where I want to pass data from lua to
metapost. I could not find an example in the source code showing this.
Can someone show a basic example of how lua-metapost interface works
or point me to the appropriate files in the source.
Found some information in the CLD manual. That is sufficient for the
task at hand for me. But a pointer to a more detailed source will be
welcome.
real low level

\starttext

\startluacode

     document.mydata = { foo = "foo", bar = 123 }

\stopluacode

\startMPcode

     draw fullcircle scaled lua("mp.print(document.mydata.bar)") ;
     draw textext (lua("mp.quoted(document.mydata.foo)")) ;

\stopMPcode

\stoptext

i'll mail you the new chapter in the metafun manual

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