Hi,
I try to create a Metapost path in lua and it works so far for the
attached example. But a call of that function from another lua function
sadly fails (no path visible after call). The code seems to be executed
later (the output from 'show pid;' appears somewhere later in the log).
How can I ensure that the code is executed at runtime?
Peter
thirddata = thirddata or { }
thirddata.drops = thirddata.drops or { }
local drops = thirddata.drops
local metafun = context.metafun
local format,todimen = string.format, string.todimen
local floor = math.floor
-- http://lua-users.org/wiki/SimpleRound
local function round(num, idp)
local mult = 10^(idp or 0)
return floor(num * mult + 0.5) / mult
end
function drops.numberofpixels(n,idp)
local dimenfactor = 1/tex.pdfpxdimen
return round(todimen(n)*dimenfactor,idp)
end
local numberofpixels = drops.numberofpixels
function drops.generate_default_path(id,width,height,radius)
local w,h,r
w = numberofpixels(width); h = numberofpixels(height); r = numberofpixels(radius)
metafun.start()
metafun("save p,pid; path p; string pid;")
-- metafun("id := \"drops:boxshadow_w%sh%sr%s\";",w,h,r)
metafun("pid := \"%s\";",id)
--metafun("show pid;") -- ok
metafun("p:= unitsquare xyscaled(%s,%s) smoothed %s;",w,h,r)
metafun("passvariable(pid,p);")
metafun("setbounds currentpicture to boundingbox(p);") -- 'activator'; void graphics are ignored
metafun.stop()
end
\ctxloadluafile{mplua}{}
\starttext
\ctxlua{metapost.showlog = true}
\ctxlua{thirddata.drops.generate_default_path("drops:boxshadow-w199h100r10","200pt","100pt","10pt")}
\ctxlua{inspect(metapost.variables)}
\stoptext
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