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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <pmset.h>
include <plio.h>
# PM_POLYGON -- Perform a rasterop operation on the area enclosed by a polygon
# drawn in a 2-dimensional plane of a mask. If the dimensionality of the mask
# exceeds 2, the pm_setplane() procedure should be called first to define the
# plane of the mask to be modified.
procedure pm_polygon (pl, x, y, npts, rop)
pointer pl #I mask descriptor
int x[npts] #I polygon x-vertices
int y[npts] #I polygon y-vertices
int npts #I number of points in polygon
int rop #I rasterop defining operation
int i
pointer sp, xp, yp
errchk pl_getplane
include "pmio.com"
begin
if (PM_MAPXY(pl) == YES) {
call smark (sp)
call salloc (xp, npts, TY_INT)
call salloc (yp, npts, TY_INT)
call pl_getplane (pl, v1)
do i = 1, npts {
v1[1] = x[i]; v1[2] = y[i]
call imaplv (PM_REFIM(pl), v1, v2, PM_MAXDIM)
Memi[xp+i-1] = v2[1]; Memi[yp+i-1] = v2[2]
}
call pl_polygon (pl, Memi[xp], Memi[yp], npts, rop)
call sfree (sp)
} else
call pl_polygon (pl, x, y, npts, rop)
end
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