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include <mach.h>
include "epix.h"
# EP_MASK -- Make a mask array with 1=aperture and 2=background annulus.
#
# Exclude values outside a specified range.
procedure ep_mask (ep, mask, ap, xa, ya, xb, yb)
pointer ep # EPIX pointer
pointer mask # Mask pointer
int ap # Aperture type
int xa, ya, xb, yb # Aperture
int xc, yc, i, j
real rad, r, a, b, c, d, minv, maxv
int x1a, x1b, x1c, x2a, x2b, x2c, y1a, y1b, y1c, y2a, y2b, y2c
pointer sp, line, ptr1, ptr2
begin
rad = max (0.5, EP_RADIUS(ep))
switch (ap) {
case APCIRCULAR:
xc = nint ((xa + xb) / 2.)
yc = nint ((ya + yb) / 2.)
a = rad ** 2
b = (rad + EP_BUFFER(ep)) ** 2
c = (rad + EP_BUFFER(ep) + EP_WIDTH(ep)) ** 2
ptr1 = mask
do j = EP_Y1(ep), EP_Y2(ep) {
d = (j - yc) ** 2
do i = EP_X1(ep), EP_X2(ep) {
r = d + (i - xc) ** 2
if (r <= a)
Memi[ptr1] = 1
else if (r >= b && r <= c)
Memi[ptr1] = 2
else
Memi[ptr1] = 0
ptr1 = ptr1 + 1
}
}
case APCDIAG:
a = rad
b = rad + EP_BUFFER(ep)
c = rad + EP_BUFFER(ep) + EP_WIDTH(ep)
if (yb - ya != 0)
d = real (xb - xa) / (yb - ya)
else
d = 1.
ptr1 = mask
do j = EP_Y1(ep), EP_Y2(ep) {
xc = xa + d * (j - ya)
do i = EP_X1(ep), EP_X2(ep) {
r = abs (i - xc)
if (r <= a)
Memi[ptr1] = 1
else if (r >= b && r <= c)
Memi[ptr1] = 2
else
Memi[ptr1] = 0
ptr1 = ptr1 + 1
}
}
case APLDIAG:
a = rad
b = rad + EP_BUFFER(ep)
c = rad + EP_BUFFER(ep) + EP_WIDTH(ep)
if (xb - xa != 0)
d = real (yb - ya) / (xb - xa)
else
d = 1.
ptr1 = mask
do j = EP_Y1(ep), EP_Y2(ep) {
do i = EP_X1(ep), EP_X2(ep) {
yc = ya + d * (i - xa)
r = abs (j - yc)
if (r <= a)
Memi[ptr1] = 1
else if (r >= b && r <= c)
Memi[ptr1] = 2
else
Memi[ptr1] = 0
ptr1 = ptr1 + 1
}
}
default:
call smark (sp)
call salloc (line, EP_NX(ep), TY_INT)
x1a = max (EP_X1(ep), min (xa, xb))
x1b = max (EP_X1(ep), int (x1a - EP_BUFFER(ep)))
x1c = max (EP_X1(ep), int (x1a - EP_BUFFER(ep) - EP_WIDTH(ep)))
x2a = min (EP_X2(ep), max (xa, xb))
x2b = min (EP_X2(ep), int (x2a + EP_BUFFER(ep)))
x2c = min (EP_X2(ep), int (x2a + EP_BUFFER(ep) + EP_WIDTH(ep)))
y1a = max (EP_Y1(ep), min (ya, yb))
y1b = max (EP_Y1(ep), int (y1a - EP_BUFFER(ep)))
y1c = max (EP_Y1(ep), int (y1a - EP_BUFFER(ep) - EP_WIDTH(ep)))
y2a = min (EP_Y2(ep), max (ya, yb))
y2b = min (EP_Y2(ep), int (y2a + EP_BUFFER(ep)))
y2c = min (EP_Y2(ep), int (y2a + EP_BUFFER(ep) + EP_WIDTH(ep)))
ptr1 = line - EP_X1(ep)
ptr2 = mask - EP_Y1(ep) * EP_NX(ep)
for (i=EP_X1(ep); i<x1c; i=i+1)
Memi[ptr1+i] = 0
for (; i<x1b; i=i+1)
Memi[ptr1+i] = 2
for (; i<x1a; i=i+1)
Memi[ptr1+i] = 0
for (; i<=x2a; i=i+1)
Memi[ptr1+i] = 1
for (; i<=x2b; i=i+1)
Memi[ptr1+i] = 0
for (; i<=x2c; i=i+1)
Memi[ptr1+i] = 2
for (; i<=EP_X2(ep); i=i+1)
Memi[ptr1+i] = 0
do i = y1a, y2a
call amovi (Memi[line], Memi[ptr2+i*EP_NX(ep)], EP_NX(ep))
for (i=x1a; i<=x2a; i=i+1)
Memi[ptr1+i] = 0
for (i=y1b; i<y1a; i=i+1)
call amovi (Memi[line], Memi[ptr2+i*EP_NX(ep)], EP_NX(ep))
for (i=y2a+1; i<=y2b; i=i+1)
call amovi (Memi[line], Memi[ptr2+i*EP_NX(ep)], EP_NX(ep))
for (i=x1b; i<=x2b; i=i+1)
Memi[ptr1+i] = 2
for (i=y1c; i<y1b; i=i+1)
call amovi (Memi[line], Memi[ptr2+i*EP_NX(ep)], EP_NX(ep))
for (i=y2b+1; i<=y2c; i=i+1)
call amovi (Memi[line], Memi[ptr2+i*EP_NX(ep)], EP_NX(ep))
for (i=EP_Y1(ep); i<y1c; i=i+1)
call aclri (Memi[ptr2+i*EP_NX(ep)], EP_NX(ep))
for (i=y2c+1; i<=EP_Y2(ep); i=i+1)
call aclri (Memi[ptr2+i*EP_NX(ep)], EP_NX(ep))
call sfree (sp)
}
# Exclude data values.
ptr2 = EP_OUTDATA(ep)
if (ptr2 == NULL ||
(IS_INDEFR(EP_MINVALUE(ep)) && IS_INDEFR(EP_MAXVALUE(ep))))
return
minv = EP_MINVALUE(ep)
maxv = EP_MAXVALUE(ep)
if (IS_INDEFR(minv))
minv = -MAX_REAL
if (IS_INDEFR(maxv))
maxv = MAX_REAL
ptr1 = mask
do j = EP_Y1(ep), EP_Y2(ep) {
do i = EP_X1(ep), EP_X2(ep) {
if (Memi[ptr1] != 0) {
if (Memr[ptr2] < minv || Memr[ptr2] > maxv)
Memi[ptr1] = 0
}
ptr1 = ptr1 + 1
ptr2 = ptr2 + 1
}
}
end
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