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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <pkg/rg.h>
# RG_INVERSE -- Invert a set of ordered and merged ranges.
procedure rg_inverse (rg, rmin, rmax)
pointer rg # RANGES pointer
int rmin # Minimum value of window
int rmax # Maximum value of window
int i
pointer rgtmp
pointer rg_window()
begin
call malloc (rgtmp, LEN_RG + 2 * (RG_NRGS(rg) + 1), TY_STRUCT)
RG_NRGS(rgtmp) = RG_NRGS(rg) + 1
RG_X1(rgtmp, 1) = rmin
do i = 1, RG_NRGS(rg) {
RG_X2(rgtmp, i) = RG_X1(rg, i) - 1
RG_X1(rgtmp, i+1) = RG_X2(rg, i) + 1
}
RG_X2(rgtmp, RG_NRGS(rgtmp)) = rmax
call rg_free (rg)
rg = rg_window (rgtmp, rmin, rmax)
call rg_free (rgtmp)
end
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