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############################################################################
#
# File: colrbook.icn
#
# Subject: Program to show the named colors
#
# Author: Gregg M. Townsend
#
# Date: December 1, 1997
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# colrbook is a mouse-driven program for choosing named colors.
# Along the left are 24 equally spaced hues plus black, gray, white,
# brown, violet, and pink. Click on any of these to see the twenty
# colors that are possible by adding lightness and saturation
# modifiers to the particular hue.
#
############################################################################
#
# Requires: Version 9 graphics
#
############################################################################
#
# Links: button, evmux, graphics
#
############################################################################
link button
link evmux
link graphics
$define BevelWidth 2
$define WindowMargin 10
$define HEADER 20 # height of header area (not incl. margin)
$define FOOTER 20 # height of footer area (not incl. margin)
$define TSIZ 12 # hue triangle size
$define HUEW 20 # hue width
$define HGAP 1 # hue gap
$define LEFT (m+TSIZ+HUEW+labw) # total space to left of grid and its margin
global cwin, huelist, sats, lgts, colrs, fillargs
global labw, leftx, w, h, m
procedure main(args)
local x, y, dx, dy, cw, ch
local i, j, ij, hue, r
lgts := ["pale", "light", "medium", "dark", "deep"]
sats := ["weak", "moderate", "strong", "vivid"]
colrs := table()
fillargs := table()
Window("size=500,350", "font=Helvetica,bold,12", args)
cwin := Clone()
m := WindowMargin
w := WAttrib("width") - 2 * m
h := WAttrib("height") - 2 * m
labw := TextWidth("medium") + 3 * m # label area width
leftx := m + TSIZ + HUEW + labw # space to left of grid and its margin
dx := (w - leftx + m) / *sats
dy := (h - HEADER - FOOTER + m) / *lgts
cw := dx - m
ch := dy - m
inithues()
every i := 1 to *sats do
every j := 1 to *lgts do {
ij := i || j
x := leftx + dx * i - cw
y := HEADER + dy * j - ch
BevelRectangle(x, y, cw, ch, -BevelWidth)
fillargs[ij] := [cwin, x + BevelWidth, y + BevelWidth,
cw - 2 * BevelWidth, ch - 2 * BevelWidth]
if Fg(cwin, colrs[ij] := NewColor("gray")) then # may fail
FillRectangle ! fillargs[ij]
}
every i := 1 to *sats do {
GrooveRectangle(leftx + m + dx * (i - 1), m / 2, dx - m, HEADER)
CenterString(leftx + dx * i - cw / 2, m / 2 + HEADER / 2, sats[i])
}
every j := 1 to *lgts do {
GrooveRectangle(leftx, HEADER + dy*j - ch/2 - HEADER/2, -labw + m, HEADER)
RightString(leftx - m, HEADER + dy*j - ch/2, lgts[j])
}
# define sensors
button(&window, "QUIT", argless, exit, m+TSIZ+HUEW+m, m, labw-2*m, HEADER)
sensor(&window, &lpress, hueclick, r, m, m, TSIZ + HUEW, h)
quitsensor(&window)
# initialize to "gray" hues using an artificial event
Enqueue(&lrelease)
hueclick(&window, 0, m, m + integer((*huelist - 4.5) / *huelist * h))
# enter event loop
evmux(&window)
end
procedure hueclick(win, arg, x, y)
local hue, e, n, i, j
e := &ldrag
while e ~=== &lrelease do {
if e === &ldrag then {
n := (*huelist * (y - m + HGAP / 2)) / h + 1
if 0 < n <= *huelist then {
hue := huelist[n]
EraseArea(m, m - TSIZ / 2, TSIZ + 1, h + TSIZ)
y := m - HGAP + integer((n - 0.5) * (h + HGAP) / *huelist)
BevelTriangle(m + TSIZ / 2, y, TSIZ / 2, "e")
setcolor(hue)
EraseArea(LEFT, m + h - FOOTER, w, FOOTER + m)
CenterString(LEFT + (w - LEFT + m)/2, m + h + m/2 - FOOTER/2, hue)
}
}
e := Event(win)
y := &y
}
return
end
procedure setcolor(hue)
local i, j, ij, prefix
static prev
every i := 1 to *sats do
every j := 1 to *lgts do {
ij := i || j
prefix := lgts[j] || " " || sats[i] || " "
if not Color(cwin, \colrs[ij], prefix || hue) then {
# no mutable color was allocated;
# free old static color, preserving grays (used for decoration)
# also preserving labeling colors ("medium vivid")
if \prev ~== "black" & \prev ~== "gray" & \prev ~== "white" then
FreeColor(cwin, ("medium vivid " ~== prefix) || \prev)
Fg(cwin, prefix || hue)
FillRectangle ! fillargs[ij]
}
}
prev := hue
return
end
procedure inithues()
local i, y1, y2, dy, win
huelist := [
"red", "orange", "red-yellow", "reddish yellow",
"yellow", "greenish yellow", "yellow-green", "yellowish green",
"green", "cyanish green", "cyan-green", "greenish cyan",
"cyan", "bluish cyan", "blue-cyan", "cyanish blue",
"blue", "blue-purple", "purple", "purple-magenta",
"magenta", "reddish magenta", "magenta-red", "magentaish red",
"black", "gray", "white",
"brown", "violet", "pink"
]
dy := real(h + HGAP) / *huelist
win := Clone(&window)
every i := 1 to *huelist do {
y1 := integer(dy * (i - 1))
y2 := integer(dy * i)
Fg(win, huelist[i])
FillRectangle(win, m + TSIZ + 1, m + y1, HUEW - 1, y2 - y1 - HGAP)
}
Uncouple(win)
return
end
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