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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <mach.h>
include "zdisplay.h"
include "iis.h"
# IISWND -- Window IIS display frame with the trackball.
procedure iiswnd3 (chan1, chan2, chan3)
int chan1[ARB], chan2[ARB], chan3[ARB]
int i, j
real x, y
short lut[LEN_LUT]
int status, xcur, ycur, lutval
int iisflu(), and()
begin
if (iisflu(chan1) == GRCHAN)
return
call iisrlt (chan1, lut)
# Starting point at lut[2] because lut[1] is background
for (i=3; (i < 257) && (lut[i] == lut[2]); i=i+1)
;
i = i - 1
for (j=255; (j > i) && (lut[j] == lut[256]); j=j-1)
;
j = j + 1
if ((i == j) || (lut[i] == lut[j])) {
xcur = 256
ycur = 384
} else {
y = real (lut[j] - lut[i]) / (j - i)
xcur = 2 * (i - 1) - (2 * lut[i] - 256) / y + 1
if (y > 1)
y = 2 - (1 / y)
if (y < -1)
y = -2 - (1 / y)
ycur = 128 * y + 256.5
}
xcur = xcur * MCXSCALE
ycur = ycur * MCYSCALE
call iiswcr (status, xcur, ycur)
status = 0
while (and (status, PUSH) == 0) {
call iisrcr (status, xcur, ycur)
if (status == EOF)
break
xcur = xcur / MCXSCALE
ycur = ycur / MCYSCALE
x = xcur / 2
y = (ycur - 255.5) / 128.
if (y > 1)
y = 1. / (2 - y)
if (y < - 1)
y = -1. / (2 + y)
do i = 1, 256 {
lutval = y * (i - 1 - x) + 127.5
lut[i] = max (0, min (255, lutval))
}
lut[1] = 0 # Make background black
if ((chan1[1] == chan2[1]) && (chan1[1] == chan3[1]))
call iiswlt (chan1, lut)
else {
call iiswlt (chan1, lut)
call iiswlt (chan2, lut)
call iiswlt (chan3, lut)
}
}
end
# IISWLT -- Write monochrome look up table.
procedure iiswlt (chan, lut)
int chan[ARB]
short lut[ARB]
int status
int iisflu()
begin
if (iisflu (chan) == GRCHAN)
return
call iishdr (IWRITE+VRETRACE, LEN_LUT, LUT, ADVXONTC, 0, chan[2],
iisflu (chan))
call iisio (lut, LEN_LUT * SZB_CHAR, status)
end
# IISRLT -- Read monochrome look up table.
procedure iisrlt (chan, lut)
int chan[ARB]
short lut[ARB]
int status
int iisflu()
begin
if (iisflu (chan) == GRCHAN)
return
call iishdr (IREAD+VRETRACE, LEN_LUT, LUT, ADVXONTC, 0, 0,
iisflu (chan))
call iisio (lut, LEN_LUT * SZB_CHAR, status)
end
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