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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <mach.h>
include "../qpex.h"
# QPEX_SUBLIST -- Extract a sublist spanning the indicated range from a
# larger range list. The number of ranges extracted is returned as the
# function value.
int procedure qpex_sublist$t (x1, x2, xs,xe,nranges,ip, o_xs,o_xe)
PIXEL x1, x2 #I range to be extracted
PIXEL xs[nranges],xe[nranges] #I input range list
int nranges #I nranges in input list
int ip #U start position in input list
PIXEL o_xs[ARB],o_xe[ARB] #O output sublist
PIXEL tol
int op, i
begin
$if (datatype == i)
tol = 0
$else
tol = (EPSILON$T * 10$f)
$endif
# Determine the range containing or immediately following the
# start point of the range of interest.
while (x1 < xs[ip] && ip > 1)
ip = ip - 1
while (x1 >= xs[ip])
if (x1 <= xe[ip] || ip >= nranges)
break
else
ip = ip + 1
# Check for an empty output range list.
if (xs[ip] > x2)
return (0)
# At least one input range contributes something to the output region.
# Copy a portion of the input range list to the ouput range list.
op = 1
do i = ip, nranges {
if (xs[i] <= x1)
o_xs[op] = LEFT$T - tol
else
o_xs[op] = xs[i]
if ((xe[i] - x2) >= tol) {
o_xe[op] = RIGHT$T + tol
op = op + 1
break
} else
o_xe[op] = xe[i]
op = op + 1
if (xs[i+1] > x2)
break
}
ip = i
return (op - 1)
end
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