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############################################################################
#
# File: wipe.icn
#
# Subject: Procedure to wipe window area
#
# Author: Ralph E. Griswold
#
# Date: May 2, 2001
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# wipe(window, color, direction, x, y, w, h) "wipes" a rectangular area of
# window to the specified color. The direction of wiping can be any one of:
#
# "right" from left to right
# "left" from right to left
# "down" from top to bottom
# "up from bottom to top
# "left-right" from left and right toward center
# "up-down" from top and bottom toward center
# "in" from outside to inside
#
# The default direction is "right".
#
# The default color is the background color of the window.
#
# x, y is the top left corner of the area and w and h are the width and
# height. An omitted value defaults to the one for the entire window.
#
############################################################################
#
# Requires: Version 9 graphics
#
############################################################################
procedure wipe(window, color, direction, x1, y1, w, h)
local x, y, x2, y2, fg
/color := Bg(window) # establish defaults
/direction := "right"
/x1 := 0
/y1 := 0
/w := WAttrib(window, "width")
/h := WAttrib(window, "height")
x2 := x1 + w
y2 := y1 + h
fg := Fg(window) # save present foreground color
Fg(window, color) # set foreground for wiping
if not(integer(x1) & integer(x2) & integer(y1) & integer(y2)) |
(x1 > x2) | (y1 > y2) then stop("*** illegal coordinates in wipe()")
case direction of {
"right": {
every x := x1 to x2 do {
DrawLine(window, x, y1, x, y2)
}
}
"left": {
every x := x2 to x1 by -1 do {
DrawLine(window, x, y1, x, y2)
}
}
"left-right": {
until (x2 < x1) do {
DrawLine(window, x1, y1, x1, y2)
DrawLine(window, x2, y1, x2, y2)
x1 +:= 1
x2 -:= 1
}
}
"up-down": {
until y2 < y1 do {
DrawLine(window, x1, y1, x2, y1)
DrawLine(window, x1, y2, x2, y2)
y1 +:= 1
y2 -:= 1
}
}
"down": {
every y := y1 to y2 do {
DrawLine(window, x1, y, x2, y)
}
}
"up": {
every y := y2 to y1 by -1 do {
DrawLine(window, x1, y, x2, y)
}
}
"in": {
until (x2 < x1) | (y2 < y1) do {
DrawLine(window, x1, y1, x1, y2, x2, y2, x2, y1, x1, y1)
x1 +:= 1
x2 -:= 1
y1 +:= 1
y2 -:= 1
}
}
default: stop("*** illegal direction specificaion in wipe()")
}
Fg(window, fg) # restore foreground color
return
end
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