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############################################################################
#
# File: wallpapr.icn
#
# Subject: Program to generate mutant shadow weave wallpaper
#
# Author: Ralph E. Griswold
#
# Date: June 19, 1999
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This program is based on the Painter weave "Shadow Op Art".
#
############################################################################
#
# Links: random, tieutils, weavegif, weavutil
#
############################################################################
link random
link tieutils
link weavegif
link weavutil
global anchors
global palpat
global palindromes
procedure main(args)
local tieup, palette, mutant, win1, win2, colorways, i
randomize()
# In this instantiation, the tieup and palindrome sequence
# basis are fixed. Anchors are shuffled (permuted randomly),
# but the palindromes attached to the anchors. That is,
# the anchors and attached palindromes are permuted together.
anchors := "1234567"
palpat := "82143657"
tieup := "8,#8040201008040201" # NOTE: this is direct tie-up
palette := "g2"
palindromes := list(*palpat)
every i := 1 to *palpat do
palindromes[i] := "[" || palpat[1:i] || "!" || palpat[i] || "]"
mutant := draft()
mutant.name := "Shadow Weave Variation"
mutant.shafts := 8
mutant.treadles := 8
mutant.colors := PaletteChars(palette)
mutant.palette := palette
mutant.tieup := tieup
every 1 to 10 do {
anchors := shuffle(anchors)
mutant.threading := mutant.treadling := "[" || thread(1) || "|]"
mutant.warp_colors := "12"
mutant.weft_colors := "21"
win2 := weavegif(expandpfd(mutant), ["canvas=hidden"])
WriteImage(win2, "bandw.gif")
WDelay(win2, 10000)
WClose(win2)
}
# Because of a memory leak (possibly in X), it is necessary to
# terminate this program at intervals and start up a new version.
system("wallpapr &")
exit()
end
# Compute sequence as pattern-form.
procedure thread(i)
local result
if i = *palpat then return ""
result := "-[" || anchors[i] || "-[" || palindromes[i] ||
thread(i + 1) || "]]"
if i = 1 then result := result[2:0]
return result
end
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