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1 files changed, 64 insertions, 0 deletions

diff --git a/sys/gio/nsppkern/gktpl.x b/sys/gio/nsppkern/gktpl.x
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+++ b/sys/gio/nsppkern/gktpl.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <gki.h>
+include	"gkt.h"
+
+# GKT_POLYLINE -- Draw a polyline.  The polyline is defined by the array of
+# points P, consisting of successive (x,y) coordinate pairs.  The first point
+# is not plotted but rather defines the start of the polyline.  The remaining
+# points define line segments to be drawn.
+
+procedure gkt_polyline (p, npts)
+
+short	p[ARB]			# points defining line
+int	npts			# number of points, i.e., (x,y) pairs
+
+pointer	pl
+int	i, len_p
+int	x,y
+include	"gkt.com"
+
+begin
+	if (npts <= 0)
+	    return
+
+	len_p = npts * 2
+
+	# Keep track of the number of drawing instructions since the last frame
+	# clear.
+	g_ndraw = g_ndraw + 1
+
+	# Update polyline attributes if necessary.
+	pl = GKT_PLAP(g_kt)
+
+	if (GKT_TYPE(g_kt) != PL_LTYPE(pl)) {
+	    call gkt_linetype (PL_LTYPE(pl))
+	    GKT_TYPE(g_kt) = PL_LTYPE(pl)
+	}
+	if (GKT_WIDTH(g_kt) != PL_WIDTH(pl)) {
+	    if (GKI_UNPACKREAL(PL_WIDTH(pl)) < 1.5)
+		call optn (*"inten", *"low")
+	    else
+		call optn (*"inten", *"high")
+	    GKT_WIDTH(g_kt) = PL_WIDTH(pl)
+	}
+	if (GKT_COLOR(g_kt) != PL_COLOR(pl)) {
+	    call gkt_color (PL_COLOR(pl))
+	    GKT_COLOR(g_kt) = PL_COLOR(pl)
+	}
+
+	# Transform the first point from GKI coords to nspp coords and
+	# move to the transformed point.
+
+	x = p[1]
+	y = p[2]
+	call frstpt(real(x)/GKI_MAXNDC, real(y)/GKI_MAXNDC)
+
+	# Draw the polyline.
+
+	for (i=3;  i <= len_p;  i=i+2) {
+	    x = p[i]
+	    y = p[i+1]
+	    call vector (real(x)/GKI_MAXNDC, real(y)/GKI_MAXNDC)
+	}
+end