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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <plset.h>
include <plio.h>
include "plcircle.h"
# PL_CIRCLE -- Rasterop between a circular region as source, and an existing
# mask as destination. It is not necessary for the center of the circle to
# be inside the mask; if it is outside, the boundary of the circle will be
# clipped to the boundary of the mask. This is a 2-dim operator. If the
# image dimensionality is greater than two the pl_setplane procedure should
# be called first to specify the plane to be modified.
procedure pl_circle (pl, x, y, radius, rop)
pointer pl #I mask descriptor
int x,y #I center coords of circle
int radius #I radius of circle
int rop #I rasterop
int y1, y2
pointer sp, ufd
extern pl_ucircle()
begin
call plvalid (pl)
call smark (sp)
call salloc (ufd, LEN_CIRCLEDES, TY_STRUCT)
y1 = max ( 1, min (PL_AXLEN(pl,2), y - radius))
y2 = max (y1, min (PL_AXLEN(pl,2), y + radius))
C_PL(ufd) = pl
C_XCEN(ufd) = x
C_YCEN(ufd) = y
C_RADIUS(ufd) = radius
C_PV(ufd) = 1
call pl_regionrop (pl, pl_ucircle, ufd, y1, y2, rop)
call sfree (sp)
end
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