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############################################################################
#
# File: recticle.icn
#
# Subject: Program to draw rectangles recursively
#
# Authors: Gregg M. Townsend and Ralph E. Griswold
#
# Date: May 2, 2001
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This program draws filled color rectangles recursively.
#
# The options supported are
#
# -w i width of image; default 400
# -h i height of image; default 250
# -p s palette; default "c3"
# -g i gap between rectangles; default 3
# -i save image file; default no
# -n s default image file prefix; default "recticle"
# -m i minimum length of side; default 10
# -b i bias -- affects size choices; default 20
#
############################################################################
#
# Requires: Version 9 graphics
#
############################################################################
#
# Links: colrlist, options, random, wopen
#
############################################################################
link colrlist
link options
link random
link wopen
global bias
global gap
global minside
global palette
procedure main(args)
local w, h, opts, name
opts := options(args, "w+h+p:g+b+m+n:i")
w := \opts["w"] | 400
h := \opts["h"] | 250
palette := \opts["p"] | "c3"
PaletteChars(palette) | stop("*** invalid palette: ", palette)
gap := \opts["g"] | 3
bias := \opts["b"] | 20
name := \opts["n"] | "recticle"
minside := \opts["m"] | 10
WOpen("width=" || w, "height=" || h, "canvas=hidden") |
stop("*** cannot open window")
randomize()
rect(gap, gap, w - gap, h - gap)
if \opts["i"] then WriteImage(name || ".gif")
WAttrib("canvas=normal")
WDone()
end
# rect(x,y,w,h) -- draw rectangle, possibly subdivided, at (x,y)
procedure rect(x, y, w, h)
local d
static colors
initial colors := colrplte(palette)
if d := divide(w < h) then { # if cut horizontally:
rect(x, y, w, d) # draw top portion
rect(x, y + d, w, h - d) # draw bottom portion
}
else if d := divide(w) then { # if cut vertically:
rect(x, y, d, h) # draw left portion
rect(x + d, y, w - d, h) # draw right portion
}
else { # else draw single rect
Fg(?colors) # set random color
FillRectangle(x, y, w - gap, h - gap) # draw
}
return
end
# divide(n) -- find division point along length n
#
# Choose and return a division point at least minside units from
# either end. Fail if the length is too small to subdivide;
# also fail randomly, depending partially on the bias setting.
procedure divide(n)
if (n > 2 * minside) & (?n > bias) then
return minside + ?(n - 2 * minside)
else
fail
end
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