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############################################################################
#
# File: gif2wif.icn
#
# Subject: Program to produce a WIF from black & white image
#
# Author: Ralph E. Griswold
#
# Date: May 7, 2001
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This program takes the name of a GIF file for a black & white image
# and outputs a WIF for a corresponding draft. If the GIF is not
# strictly black & white, all non-black pixels are interpreted as
# white.
#
############################################################################
#
# Links: graphics
#
############################################################################
#
# Requires: Version 9 graphics
############################################################################
link graphics
procedure main(args)
local rows, cols, treadling, threading, count, tieup, y, width, height
local shafts, treadles, i, tie_line, row, treadle, draft, p
WOpen("image=" || args[1], "canvas=hidden") |
stop("*** cannot open image")
width := WAttrib("width")
height := WAttrib("height")
rows := [] # start with empty list
every y := 0 to height - 1 do {
row := ""
every p := Pixel(0, y, width, 1) do
if ColorValue(p) == "0,0,0" then row ||:= "1"
else row ||:= "0"
put(rows, row)
}
cols := rot(rows) # rotate to get columns
treadles := examine(rows) # get treadles
shafts := examine(cols) # get shafts
treadling := [] # construct treadling sequence
every put(treadling, treadles[!rows])
threading := [] # construct threading sequence
every put(threading, shafts[!cols])
tieup := table()
every row := key(treadles) do { # get unique rows
treadle := treadles[row] # assigned treadle number
tie_line := repl("0", *shafts) # blank tie-up line
every i := 1 to *row do # go through row
if row[i] == "1" then # if warp on top
tie_line[threading[i]] := "1" # mark shaft position
tieup[treadle] := tie_line # add line to tie-up
}
# Now output the WIF.
write("[WIF]")
write("Version=1.1")
write("Date=" || &dateline)
write("Developers=ralph@cs.arizona.edu")
write("Source Program=gif2wif.icn")
write("[CONTENTS]")
write("Color Palette=yes")
write("Text=yes")
write("Weaving=yes")
write("Tieup=yes")
write("Color Table=yes")
write("Threading=yes")
write("Treadling=yes")
write("Warp colors=yes")
write("Weft colors=yes")
write("Warp=yes")
write("Weft=yes")
write("[COLOR PALETTE]")
write("Entries=2")
write("Form=RGB")
write("Range=0," || 2 ^ 16 - 1)
write("[TEXT]")
write("Title=example")
write("Author=Ralph E. Griswold")
write("Address=5302 E. 4th St., Tucson, AZ 85711")
write("EMail=ralph@cs.arizona.edu")
write("Telephone=520-881-1470")
write("FAX=520-325-3948")
write("[WEAVING]")
write("Shafts=", *shafts)
write("Treadles=", *treadles)
write("Rising shed=yes")
write("[WARP]")
write("Threads=", *threading)
write("Units=Decipoints")
write("Thickness=10")
write("Color=1")
write("[WEFT]")
write("Threads=", *treadling)
write("Units=Decipoints")
write("Thickness=10")
write("Color=2")
write("[COLOR TABLE]")
write("1=0,0,0")
write("2=65535,65535,65535")
write("[THREADING]")
every i := 1 to *threading do
write(i, "=", threading[i])
write("[TREADLING]")
every i := 1 to *treadling do
write(i, "=", treadling[i])
write("[TIEUP]")
every i := 1 to *tieup do
write(i, "=", tromp(tieup[i]))
end
#procedure tromp(treadle)
# local result
#
# result := ""
#
# treadle ? {
# every result ||:= upto("1") || ","
# }
#
# return result[1:-1]
#
#end
#
procedure tromp(treadle)
local result, i
result := ""
every i := 1 to *treadle do
if treadle[i] == 1 then result ||:= i || ","
return result[1:-1]
end
procedure examine(array)
local count, lines, line
lines := table() # table to be keyed by line patterns
count := 0
every line := !array do # process lines
/lines[line] := (count +:= 1) # if new line, insert with new number
return lines
end
procedure rot(rows)
local cols, row, grid, i
cols := list(*rows[1], "")
every row := !rows do {
i := 0
every grid := !row do
cols[i +:= 1] := grid || cols[i]
}
return cols
end
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