[NTG-context] plot data from file: cld

[John Kitzmiller]

I seek how to use context-lua to draw a path from ‘points’ in an external file. 

Below is one way to plot points from an external file, call the file DATA with contents:

1 3
-2 2
-3 -1
3 -2

\starttext
\startluacode
local metafun = context.metafun
metafun.start()

io.input(“DATA")
while true do
  local x, y = io.read("*n", "*n")
  if not x then break end
  metafun("filldraw fullcircle scaled 2mm shifted(%dcm,%dcm);",x,y)
end

metafun.stop()
\stopluacode
\stoptext


How to make this a polygon?

I know other ways to read and manipulate DATA with Lua—it is the drawing part where I most look for help.

Thanks,
John