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############################################################################
#
# File: tile.icn
#
# Subject: Procedure to tile window
#
# Author: Ralph E. Griswold
#
# Date: September 29, 1997
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This procedure tiles a portion of win1 over the specified portion
# of win2, doubling to reduce the number of copies required.
#
############################################################################
#
# Requires: Version 9 graphics
#
############################################################################
procedure tile(win1, win2, x1, y1, w1, h1) #: tile area with image
local w, h, wmax, hmax
/win1 := &window
/win2 := &window
/x1 := 0
/y1 := 0
/w1 := WAttrib(win1, "width")
/h1 := WAttrib(win1, "height")
wmax := WAttrib(win2, "width")
hmax := WAttrib(win2, "height")
if (w1 | h1) = 0 then fail
if w1 < 0 then {
w1 := -w1
x1 -:= w1
}
if h1 < 0 then {
h1 := -h1
y1 -:= h1
}
CopyArea(win1, win2, x1, y1, w1, h1) # initial copy
while w1 < wmax do { # copy and double
CopyArea(win2, win2, 0, 0, w1, h1, w1, 0)
w1 *:= 2
}
while h1 < hmax do { # copy and double
CopyArea(win2, win2, 0, 0, w1, h1, 0, h1)
h1 *:= 2
}
return
end
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