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
10
11local format, load, type = string.format, load, type
12
13local context = context
14local metapost = metapost
15
16local metafun = metapost.metafun or { }
17metapost.metafun = metafun
18
19function metafun.topath(t,connector)
20 context("(")
21 if #t > 0 then
22 if not connector then
23 connector = ".."
24 end
25 for i=1,#t do
26 if i > 1 then
27 context(connector)
28 end
29 local ti = t[i]
30 if type(ti) == "string" then
31 context(ti)
32 else
33 context("(%F,%F)",ti.x or ti[1] or 0,ti.y or ti[2] or 0)
34 end
35 end
36 else
37 context("origin")
38 end
39 context(")")
40end
41
42function metafun.interpolate(f,b,e,s,c)
43 local done = false
44 context("(")
45 local d = load(format("return function(x) return %s end",f))
46 if d then
47 d = d()
48 if not c then
49 c = "..."
50 end
51 for i=b,e,(e-b)/s do
52 if done then
53 context(c)
54 else
55 done = true
56 end
57 context("(%F,%F)",i,d(i))
58 end
59 end
60 if not done then
61 context("origin")
62 end
63 context(")")
64end
65 |
