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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <gset.h>
+include <gio.h>
+
+# GPMARK -- Polymarker. Output at sequence of markers at the vertices of a
+# polygon, all markers the same type and size. The marker type GM_POINT is
+# a special case.
+
+procedure gpmark (gp, x, y, npts, marktype, xsize, ysize)
+
+pointer gp # graphics descriptor
+real x[ARB], y[ARB] # vertices of polygon
+int npts # number of points
+int marktype # marker type
+real xsize, ysize # marker size
+int i
+
+begin
+ if (marktype == GM_POINT) {
+ call gpl_settype (gp, POINTMODE)
+ call gpline (gp, x, y, npts)
+ call gpl_settype (gp, POLYLINE)
+ } else {
+ do i = 1, npts
+ call gmark (gp, x[i], y[i], marktype, xsize, ysize)
+ }
+end