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############################################################################
#
# File: tieutils.icn
#
# Subject: Procedures related to weaving tie-ups
#
# Author: Ralph E. Griswold
#
# Date: June 15, 1999
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# imr2tie(imr) converts g2 image record to tie-ip
#
# pat2tie(pat) converts bi-level pattern to tie-up string
#
# pat2tier(pat) converts bi-level pattern to tie-up record
#
# showtie(s, size, fg, bg)
# produces a hidden window for the tie-up as a matrix
# with the specified foreground and background colors
#
# testtie(s) succeeds if s is a valid tie-up but fails otherwise
#
# tie2imr(s) converts tie-up to g2 image record
#
# tie2pat(tie) converts tie-up to bi-level pattern
#
# tie2coltier(s) creates a black/white color tieup-record for
# tie-up s
#
# tie2tier(s) creates a 0/1 tie-up record for tie-up s
#
# tier2rstring(r) creates a tie-up string from a tie-up record
#
############################################################################
#
# Requires: Version 9 graphics
#
############################################################################
#
# Links: cells, wopen, patutils, imrutils
#
############################################################################
link cells
link wopen
link patutils
link imrutils
record tie(shafts, treadles, matrix)
procedure imr2tie(imr) #: convert image record to tie-up
return imr.width || ";" || *imr.pixels / imr.width || ";" || imr.pixels
end
procedure pat2tie(pat) #: convert pattern to tie-up string
local matrix, tieup, shafts, treadles
pat ? { # OLD-STYLE BIT STRING TIE-UP
if shafts := tab(upto(',')) &
move(1) &
treadles := tab(upto(',')) &
move(1) then {
matrix := list(shafts)
while put(matrix, move(treadles))
}
else matrix := pat2rows(pat)
}
tieup := tie(*matrix[1], *matrix, matrix)
return tier2string(tieup)
end
procedure pat2tier(pat) #: convert pattern to tie-up record
local matrix
matrix := pat2rows(pat)
return tie(*matrix[1], *matrix, matrix)
end
# Set up empty palette grid
procedure showtie(tieup, cellsize, fg, bg) #: create image of tie-up
local x, y, panel, row, n, m, color
/cellsize := 10
tieup ?:= {
n := tab(upto(';')) &
move(1) &
m := tab(upto(';')) &
move(1) &
tab(0)
} | stop("*** invalid tieup")
panel := makepanel(n, m, cellsize, fg, bg)
tieup ? {
y := 1
while row := move(n) do {
every x := 1 to n do {
color := if row[x] == "1" then "black" else "white"
colorcell(panel, x, y, color)
}
y +:= 1
}
}
return panel
end
procedure testtie(s) #: test validity of tie-up s
local n, m, bits
s ? {
n := (0 < integer(tab(upto(';')))) &
move(1) &
m := (0 < integer(tab(upto(';')))) &
move(1) &
bits := tab(0)
} | fail # bad header
if *(cset(bits) -- '01') > 0 then fail # illegal characters
if *bits ~= (n * m) then fail # wrong length
return s
end
procedure tie2imr(tie) #: convert tie-up to image record
local width
tie ? {
width := tab(upto(';'))
move(1)
tab(upto(';') + 1)
return imstoimr(width || ",g2," || tab(0))
}
end
procedure tie2pat(shafts, treadles, tie) #: convert tie-up record to ims
local tieup, matrix
tieup := tie2tier(shafts, treadles, tie)
matrix := tieup.matrix
return rows2pat(matrix)
end
procedure tie2tier(shafts, treadles, tieup) #: create 0/1 tie-up record
local matrix
matrix := []
tieup ? {
every 1 to treadles do
put(matrix, move(shafts))
}
return tie(shafts, treadles, matrix)
end
procedure tie2coltier(tieup) #: create color tie-up record
local result, shafts, treadles, rec
result := []
if not upto(';', tieup) then # old-style tie-up
tieup := "8;8;" || tieup
tieup ? {
(
shafts := tab(upto(';')) &
move(1) &
treadles := tab(upto(';')) &
move(1)
) | stop("*** invalid tieup")
every 1 to shafts do
put(result, tcolors(move(treadles)))
}
return tie(shafts, treadles, result)
end
procedure tcolors(s)
local i, result
result := []
every i := 1 to *s do
put(result, if s[i] == "0" then "black" else "white")
return result
end
procedure tier2string(rec) #: convert tie-up record to string
local result
result := ""
every result ||:= !rec.matrix
return result
end
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