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include <mach.h>
include "apertures.h"
# AP_NEAREST -- Find the index of the aperture nearest cursor position x.
define DELTA 0.01 # Tolerance for equidistant apertures
procedure ap_nearest (index, line, aps, naps, x)
int index # Index of aperture nearest x
int line # Dispersion line
pointer aps[ARB] # Aperture pointers
int naps # Number of apertures
real x # Point nearest aperture
int i, j, apaxis
char ch
real d, delta
pointer ap
int fscan(), nscan()
real ap_cveval()
begin
if (naps == 0)
return
index = 0
delta = MAX_REAL
for (i = 1; i <= naps; i = i + 1) {
ap = aps[i]
apaxis = AP_AXIS(ap)
d = abs (AP_CEN(ap, apaxis)+ap_cveval(AP_CV(ap),real(line))-x)
if (d < delta - DELTA) {
j = 1
index = i
delta = d
} else if (d < delta + DELTA)
j = j + 1
}
# If there is more than one aperture equally near ask the user.
if (j > 1) {
call printf ("Apertures")
for (i = 1; i <= naps; i = i + 1) {
ap = aps[i]
apaxis = AP_AXIS(ap)
d = abs (AP_CEN(ap, apaxis)+ap_cveval(AP_CV(ap),real(line))-x)
if (d < delta + DELTA) {
call printf (" %d")
call pargi (AP_ID (ap))
}
}
call printf (" are equally near the cursor.\n")
10 call printf ("Choose an aperture (%d): ")
call pargi (AP_ID (aps[index]))
call flush (STDOUT)
if (fscan (STDIN) != EOF) {
call scanc (ch)
if (ch == '\n')
return
call reset_scan()
call gargi (j)
if (nscan() == 0)
goto 10
for (i=1; (i<=naps)&&(AP_ID(aps[i])!=j); i=i+1)
;
if (i > naps)
goto 10
index = i
}
}
end
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