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############################################################################
#
# File: gif2geom.icn
#
# Subject: Program to analyze weaving patterns
#
# Author: Ralph E. Griswold
#
# Date: June 15, 1999
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This program does a row analysis of a GIF image, labels each unique row,
# and then outputs a string of row labels for the image and the value of
# each as a string of palette characters.
#
# The following option is supported:
#
# -p s palette name, default "c1"
#
############################################################################
#
# Requires: Version 9 graphics
#
############################################################################
#
# Links: options, weavutil, wopen
#
############################################################################
link options
link weavutil
link wopen
procedure main(args)
local rows_diff, height, width, y, row, count, row_pattern, pixel, opts
local palette
opts := options(args, "p:")
palette := \opts["p"] | "c1" # need to check for valid palette
WOpen("image=" || args[1], "canvas=hidden") | stop("*** cannot open image")
rows_diff := table()
row_pattern := ""
height := WAttrib("height")
width := WAttrib("width")
count := 0
every y := 0 to height - 1 do {
row := ""
every pixel := Pixel(0, y, width, 1) do
row ||:= PaletteKey(palette, pixel)
if /rows_diff[row] then
rows_diff[row] := (count +:= 1)
row_pattern ||:= possym(rows_diff[row]) |
stop("*** too many different rows to label")
}
write(row_pattern)
rows_diff := sort(rows_diff, 3)
while write(get(rows_diff)) do
get(rows_diff)
end
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