Initial commit

1 files changed, 51 insertions, 0 deletions

diff --git a/pkg/xtools/gtools/gtvplot.x b/pkg/xtools/gtools/gtvplot.x
new file mode 100644
index 00000000..23550c3d
--- /dev/null
+++ b/pkg/xtools/gtools/gtvplot.x
@@ -0,0 +1,51 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<gset.h>
+include	"gtools.h"
+
+# GT_VPLOT -- Plot vector polymarks or polylines.
+
+procedure gt_vplot (gp, gt, v, npts, x1, x2)
+
+pointer	gp		# GIO pointer
+pointer	gt		# GTOOLS pointer
+real	v[npts]		# Abscissas
+int	npts		# Number of points
+real	x1, x2		# Vector range
+
+int	i, pltype, color, gstati()
+real	x, dx
+
+begin
+	switch (GT_TYPE(gt)) {
+	case 1:
+	    color = gstati (gp, G_PMCOLOR)
+	    call gseti (gp, G_PMCOLOR, GT_COLOR(gt))
+	    call gvmark (gp, v, npts, x1, x2, GT_MARK(gt), GT_XSIZE(gt),
+		GT_YSIZE(gt))
+	    call gseti (gp, G_PMCOLOR, color)
+	case 2:
+	    color = gstati (gp, G_PLCOLOR)
+	    call gseti (gp, G_PLCOLOR, GT_COLOR(gt))
+	    pltype = gstati (gp, G_PLTYPE)
+	    call gseti (gp, G_PLTYPE, GT_LINE(gt))
+	    call gvline (gp, v, npts, x1, x2)
+	    call gseti (gp, G_PLTYPE, pltype)
+	    call gseti (gp, G_PLCOLOR, color)
+	case 3:
+	    color = gstati (gp, G_PLCOLOR)
+	    call gseti (gp, G_PLCOLOR, GT_COLOR(gt))
+	    pltype = gstati (gp, G_PLTYPE)
+	    call gseti (gp, G_PLTYPE, GT_LINE(gt))
+	    dx = (x2 - x1) / (npts - 1)
+	    x = x1 - dx / 2
+	    do i = 1, npts-1 {
+		x = x + dx
+		call gline (gp, x-dx, v[i], x, v[i])
+		call gline (gp, x, v[i], x, v[i+1])
+	    }
+	    call gline (gp, x, v[npts], x+dx, v[npts])
+	    call gseti (gp, G_PLTYPE, pltype)
+	    call gseti (gp, G_PLCOLOR, color)
+	}
+end