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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <pkg/rg.h>
# RG_UNION -- Find the union of two sets of ranges.
pointer procedure rg_union (rg1, rg2)
pointer rg1 # First set of ranges
pointer rg2 # Second set of ranges
pointer rg3 # Pointer to union
int i, j
begin
# Error check the range pointers.
if ((rg1 == NULL) || (rg2 == NULL))
call error (0, "Range descriptor(s) undefined")
# Allocate the range points array.
i = RG_NRGS(rg1) + RG_NRGS(rg2)
call malloc (rg3, LEN_RG + 2 * max (1, i), TY_STRUCT)
# Set the ranges.
RG_NRGS(rg3) = i
RG_NPTS(rg3) = RG_NPTS(rg1) + RG_NPTS(rg2)
j = 1
do i = 1, RG_NRGS(rg1) {
RG_X1(rg3, j) = RG_X1(rg1, i)
RG_X2(rg3, j) = RG_X2(rg1, i)
j = j + 1
}
do i = 1, RG_NRGS(rg2) {
RG_X1(rg3, j) = RG_X1(rg2, i)
RG_X2(rg3, j) = RG_X2(rg2, i)
j = j + 1
}
call rgorder (rg3)
call rgmerge (rg3)
return (rg3)
end
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