Re: [NTG-context] lmt_chart_bar with data from luacode

23 Jul 2021

      On 7/23/2021 11:07 AM, Jorge Manuel wrote:
...
Dear Sirs
If I tried:
\starttext
\startluacode
sample = {10,30,30,40}
 function MP.GetP()
  mp.print(sample)
  end
\stopluacode
\startMPcode
draw lmt_chart_bar [
  width = 8cm,
  height = 10mm,
  samples = {lua.MP.GetP()} ,
  trace = true,
  maximum = 100,
  linewidth = 1mm,
  showlabels = false,
  originsize = 0,
  labelanchor = "lft",
  labelcolor = "black"
  labelstyle = "bfxx"
  legendstyle = "tfxx",
  labelstrut = "yes",
] ;
\stopMPcode
\stoptext
This works.
But with an extra element in the sample table:
\starttext
\startluacode
sample = {10,30,30,40,50}
 function MP.GetP()
  mp.print(sample)
  end
\stopluacode
\startMPcode
draw lmt_chart_bar [
  width = 8cm,
  height = 10mm,
  samples = {lua.MP.GetP()} ,
  trace = true,
  maximum = 100,
  linewidth = 1mm,
  showlabels = false,
  originsize = 0,
  labelanchor = "lft",
  labelcolor = "black"
  labelstyle = "bfxx"
  legendstyle = "tfxx",
  labelstrut = "yes",
] ;
\stopMPcode
\stoptext
Don't works anymore. Why?
(watch out: samples is global in your code)
your lua.MP.GetP() becomes some mp quantity and 4 entries becomes a 
cmykcolor and you're just lucky that that works (reverse casting makes 
it a table) and there is no 5 element quantity so, you end up in 
scantokens not being able to understand it

I'll think of a way to pass records (new submechanism) at some point but 
for now i added this:

\startluacode
     document.samples = {
         { 10, 30, 30, 40, 50 }
     }
\stopluacode

\startMPcode

draw lmt_chart_bar [
  width = 8cm,
  height = 10mm,
  trace = true,
  maximum = 100,
  linewidth = 1mm,
  showlabels = false,
  sampleset = "document.samples",
  originsize = 0,
  labelanchor = "lft",
  labelcolor = "black"
  labelstyle = "bfxx"
  legendstyle = "tfxx",
  labelstrut = "yes",
] ;
\stopMPcode

with the spec being some lua, so this will also work:

  sampleset = "table.load('foo.lua')",

asuming foo.lua has this:

return {
     { 10, 30, 30, 40, 50 }
}

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