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############################################################################
#
# File: findrpt.icn
#
# Subject: Program to find smallest repeat in a repeat pattern
#
# Author: Ralph E. Griswold
#
# Date: December 5, 1995
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This program produces the smallest motif in an image that will tile
# to the image.
#
# The image to be processed must be a "true" repeat -- pixel for pixel.
#
# The options supported are:
#
# -n s suffix for output image, default _t. The suffix is
# appended to the basename of the input image, as in
# foo.gif -> foo_t.gif.
#
# -s show size; default produce image
#
# Warning: This program is *very* slow.
#
#
############################################################################
#
# Requires: Version 9 graphics
#
############################################################################
#
# Links: numbers, options, repetit, wopen
#
############################################################################
link numbers
link options
link repetit
link wopen
procedure main(args)
local width, height, x, y, row, col, rows, cols, w, h, suffix, file
local basename, opts
opts := options(args, "n:s")
suffix := \opts["s"] | "_t"
every file := !args do {
WOpen("canvas=hidden", "image=" || file) | {
write(&errout, "*** cannot open ", file)
next
}
file ? {
basename := 1(tab(find(".gif")), move(0)) | "unname"
}
width := WAttrib("width")
height := WAttrib("height")
rows := []
every y := 0 to height - 1 do {
row := []
every put(row,Pixel(0, y, width, 1))
put(rows, repetit(row))
}
h := lcml ! rows
h >:= height
cols := []
every x := 0 to width - 1 do {
col := []
every put(col, Pixel(x, 0, 1, height))
put(cols, repetit(col))
}
w := lcml ! cols
w >:= width
if w = width & h = height then {
write(&errout, file, " has no subrepeat")
next
}
if \opts["s"] then
write(file, ": ", w, "x", h)
else
WriteImage(basename || suffix || ".gif", 0, 0, w, h) | {
write(&errout, "*** cannot write image for ", file)
write(&errout, "w=", w, " h=", h)
}
WClose(&window)
&window := &null
}
end
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