diff options
Diffstat (limited to 'tex/context/base/meta-fun.lua')
-rw-r--r-- | tex/context/base/meta-fun.lua | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/tex/context/base/meta-fun.lua b/tex/context/base/meta-fun.lua new file mode 100644 index 000000000..fef2aa12b --- /dev/null +++ b/tex/context/base/meta-fun.lua @@ -0,0 +1,55 @@ +if not modules then modules = { } end modules ['meta-fun'] = { + version = 1.001, + comment = "companion to meta-fun.mkiv", + 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 |