1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
############################################################################
#
# File: mandala.icn
#
# Subject: Program to draw mandala design
#
# Author: Ralph E. Griswold
#
# Date: September 13, 1997
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This program draws "mandala" patterns.
#
# The following options are supported:
#
# -g run continuously; ignore user events; default: process user
# events
# -l i limit on number of iterations, default 2 ^ 10
# -n i maximum number of points, default 50
# -s i size of window (width/height); default 256
#
############################################################################
#
# Requires: Version 9 graphics
#
############################################################################
#
# Links: gobject, interact, joinpair, options, wopen
#
############################################################################
link gobject
link interact
link joinpair
link options
link wopen
procedure main(args)
local i, j, k, angle, incr, xpoint, ypoint, size, radius, opts
local extent, max, limit, run, points
opts := options(args, "gl+n+s+")
extent := \opts["s"] | 256
limit := \opts["l"] | (2 ^ 10)
max := \opts["n"] | 50
run := opts["g"]
radius := extent / 2
WOpen("label=mandala", "width=" || extent, "height=" || extent,
"bg=light gray", "dx=" || (extent / 2), "dy=" || (extent / 2)) |
ExitNotice("Cannot open window.")
every 1 to limit do {
i := ?max
if i < 4 then i+:= 3 + ?10 # too few doesn't work well ...
points := list(i)
angle := 0.0
incr := 2 * &pi / i
every j := 1 to i do {
points[j] := Point(radius * cos(angle), radius * sin(angle))
angle +:= incr
}
joinpair(points, points)
if /run then repeat case Event() of {
"q": exit()
"s": snapshot()
"n": break
}
WDelay(1000)
EraseArea()
}
end
|
