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############################################################################
#
# File: shadow.icn
#
# Subject: Program to build pattern-form drafts for shadow weaves
#
# 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".
#
# Supported options are:
#
# -b s palindrome base sequence, default "8214365"
# -c s warp colors, default "01"
# -d s weft colors, default "10"
# -n s name, default "untitled_shadow_weave"
# -p s palette, default "g2"
# -t s tie-up, default "8,#8040201008040201" # DIRECT TIE-UP
#
# The first non-option command-line argument is a transposition vector for
# the anchors; default 1234567. The second non-option command-line argument
# is a transposition vector for the palindromes; default the anchor
# transposition vector.
#
# For example,
#
# shadow 7654321
#
# reverses the default order of both the anchors and palindromes.
#
############################################################################
#
# Links: options, strings
#
############################################################################
link options
link strings
global anchor_indices
global palindrome_indices
global palindrome_basis
global palindromes
procedure main(args)
local expression, name, opts, tie_up, warp_colors, weft_colors, palette
local i, anchor_vector, palindrome_vector
opts := options(args, "b:n:t:c:d:p:")
anchor_vector := \args[1] | "1234567"
palindrome_vector := \args[2] | anchor_vector
palindrome_basis := \opts["b"] | "8214365"
weft_colors := \opts["c"] | "01"
warp_colors := \opts["d"] | "10"
palette := \opts["p"] | "g2"
name := \opts["n"] | "untitled_shadow_weave"
tie_up := \opts["t"] | "8,#8040201008040201"
anchor_indices := transpose("1234567", "1234567", anchor_vector)
palindrome_indices := transpose("1234567", "1234567", palindrome_vector)
palindromes := list(*palindrome_basis)
every i := 1 to *palindrome_basis do
palindromes[i] := "[" || palindrome_basis[1:i] || "!" || palindrome_basis[i] || "]"
expression := "[" || threading(anchor_indices[1]) || "|]"
write(name)
write(expression)
write(expression)
write(warp_colors)
write(weft_colors)
write(palette)
write(tie_up)
write()
end
procedure threading(i)
local result
if i > *palindrome_basis then return ""
result := "-[" || anchor_indices[i] || "-[" ||
palindromes[anchor_indices[i]] || threading(i + 1) || "]]"
if i = 1 then result := result[2:0]
return result
end
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