meta-fun.lua /size: 1488 b    last modification: 2020-07-01 14:35
1if not modules then modules = { } end modules ['meta-fun'] = {
2    version   = 1.001,
3    comment   = "companion to meta-fun.mkiv",
4    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
5    copyright = "PRAGMA ADE / ConTeXt Development Team",
6    license   = "see context related readme files",
7}
8
9-- very experimental, actually a joke ... see metafun manual for usage
10
11local format, load, type = string.format, load, type
12
13local context    = context
14local metapost   = metapost
15
16metapost.metafun = metapost.metafun or { }
17local metafun    = metapost.metafun
18
19function metafun.topath(t,connector)
20    context("(")
21    if #t > 0 then
22        for i=1,#t do
23            if i > 1 then
24                context(connector or "..")
25            end
26            local ti = t[i]
27            if type(ti) == "string" then
28                context(ti)
29            else
30                context("(%F,%F)",ti.x or ti[1] or 0,ti.y or ti[2] or 0)
31            end
32        end
33    else
34        context("origin")
35    end
36    context(")")
37end
38
39function metafun.interpolate(f,b,e,s,c)
40    local done = false
41    context("(")
42    for i=b,e,(e-b)/s do
43        local d = load(format("return function(x) return %s end",f))
44        if d then
45            d = d()
46            if done then
47                context(c or "...")
48            else
49                done = true
50            end
51            context("(%F,%F)",i,d(i))
52        end
53    end
54    if not done then
55        context("origin")
56    end
57    context(")")
58end
59