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############################################################################
#
# File: trycolor.icn
#
# Subject: Program to investigate color specifications
#
# Author: Gregg M. Townsend
#
# Date: July 14, 1995
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# trycolor repeatedly reads a color specification from standard input
# and displays a disc of that color. A color specification may be in any
# of the forms accepted by Icon, for example:
#
# blue
# #ffedcb
# 50010,60422,8571
# dark greenish blue
#
# Additionally, the leading '#' may be omitted from hexadecimal forms.
#
############################################################################
#
# Requires: Version 9 graphics
#
############################################################################
#
# Links: options, optwindw, graphics
#
############################################################################
link options
link optwindw
link graphics
procedure main(args)
local win, gc, line, cval, mono, color, opts, m, w, h, l
local r, g, b, rr, gg, bb, x
opts := options(args, winoptions())
/opts["W"] := 300
/opts["H"] := 300
/opts["M"] := -1
win := optwindow(opts, "cursor=off", "echo=off")
gc := Clone(win)
m := opts["M"]
w := opts["W"]
h := opts["H"]
l := WAttrib(win, "leading")
color := opts["F"]
mono := WAttrib(win, "depth") == "1"
write("gamma=", WAttrib(win, "gamma"))
repeat {
if *color > 0 then {
if Shade(gc, color | (color := "#" || color)) then {
EraseArea(gc)
FillArc(gc, m, m, w, h)
Fg(win, Contrast(win, color))
cval := ColorValue(win, color)
cval ? {
r := tab(many(&digits)); move(1)
g := tab(many(&digits)); move(1)
b := tab(many(&digits))
}
rr := hexv(r / 65536.0)
gg := hexv(g / 65536.0)
bb := hexv(b / 65536.0)
CenterString(win, m + w/2, m + h/2 - l, color)
CenterString(win, m + w/2, m + h/2, cval)
CenterString(win, m + w/2, m + h/2 + l, "#" || rr || gg || bb)
}
else
write("[failed]")
}
writes("> ")
line := read() | break
line ? {
tab(many(' \t'))
color := trim(tab(0))
}
}
end
procedure hexv(v) # two-hex-digit specification of v
static hextab
initial {
every put((hextab := []), !"0123456789ABCDEF" || !"0123456789ABCDEF")
}
return hextab [1 + integer(256 * v)]
end
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