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if not modules then modules = { } end modules ['meta-fun'] = {
version = 1.001,
comment = "companion to meta-fun.tex",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files",
}
-- very experimental, actually a joke ... see metafun manual for usage
local format, loadstring, type = string.format, loadstring, type
local texwrite = tex.write
metafun = metafun or { }
function metafun.topath(t,connector)
tex.write("(")
if #t > 0 then
for i=1,#t do
if i > 1 then
texwrite(connector or "..")
end
local ti = t[i]
if type(ti) == "string" then
texwrite(ti)
else
texwrite(format("(%s,%s)",ti.x or ti[1] or 0,ti.y or ti[2] or 0))
end
end
else
texwrite("origin")
end
texwrite(")")
end
function metafun.interpolate(f,b,e,s,c)
local done = false
tex.write("(")
for i=b,e,(e-b)/s do
local d = loadstring(format("return function(x) return %s end",f))
if d then
d = d()
if done then
texwrite(c or "...")
else
done = true
end
texwrite(format("(%s,%s)",i,d(i)))
end
end
if not done then
texwrite("origin")
end
texwrite(")")
end
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