From ba1945d685cfbee0a8cbf3c53a8356eaa9484bc0 Mon Sep 17 00:00:00 2001
From: Holger Vogt <holger.vogt@uni-due.de>
Date: Tue, 30 Jun 2020 23:23:19 +0200
Subject: [PATCH] enable flags xdelta, ydelta for gnuplot command

---
 src/frontend/plotting/gnuplot.c | 11 +++++++++--
 src/frontend/plotting/gnuplot.h |  1 +
 src/frontend/plotting/plotit.c  |  5 ++++-
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/src/frontend/plotting/gnuplot.c b/src/frontend/plotting/gnuplot.c
index d1e6c3371..b3908d7b7 100644
--- a/src/frontend/plotting/gnuplot.c
+++ b/src/frontend/plotting/gnuplot.c
@@ -50,6 +50,7 @@ quote_gnuplot_string(FILE *stream, char *s)
 
 
 void ft_gnuplot(double *xlims, double *ylims,
+        double xdel, double ydel,
         const char *filename, const char *title,
         const char *xlabel, const char *ylabel,
         GRIDTYPE gridtype, PLOTTYPE plottype,
@@ -228,9 +229,15 @@ void ft_gnuplot(double *xlims, double *ylims,
             fprintf(file, "set yrange [%e:%e]\n", ylims[0] - extrange, ylims[1] + extrange);
     }
 
-    fprintf(file, "#set xtics 1\n");
+    if (xdel > 0.)
+        fprintf(file, "set xtics %e\n", xdel);
+    else
+        fprintf(file, "#set xtics 1\n");
     fprintf(file, "#set x2tics 1\n");
-    fprintf(file, "#set ytics 1\n");
+    if (ydel > 0.)
+        fprintf(file, "set ytics %e\n", ydel);
+    else
+        fprintf(file, "#set ytics 1\n");
     fprintf(file, "#set y2tics 1\n");
 
     if (gridlinewidth > 1)
diff --git a/src/frontend/plotting/gnuplot.h b/src/frontend/plotting/gnuplot.h
index f4ebbabea..16c8676d4 100644
--- a/src/frontend/plotting/gnuplot.h
+++ b/src/frontend/plotting/gnuplot.h
@@ -7,6 +7,7 @@
 #define ngspice_GNUPLOT_H
 
 void ft_gnuplot(double *xlims, double *ylims,
+        double xdel, double del,
         const char *filename, const char *title,
         const char *xlabel, const char *ylabel,
         GRIDTYPE gridtype, PLOTTYPE plottype,
diff --git a/src/frontend/plotting/plotit.c b/src/frontend/plotting/plotit.c
index 57e284e85..e5073fa56 100644
--- a/src/frontend/plotting/plotit.c
+++ b/src/frontend/plotting/plotit.c
@@ -1077,7 +1077,10 @@ bool plotit(wordlist *wl, const char *hcopy, const char *devname)
 
     if (devname && eq(devname, "gnuplot")) {
         /* Interface to Gnuplot Plot Program */
-        ft_gnuplot(xlims, ylims, hcopy,
+        ft_gnuplot(xlims, ylims,
+                   xdelta ? *xdelta : 0.0,
+                   ydelta ? *ydelta : 0.0,
+                   hcopy,
                    title ? title : vecs->v_plot->pl_title,
                    xlabel ? xlabel : ft_typabbrev(vecs->v_scale->v_type),
                    ylabel ? ylabel : ft_typabbrev(y_type),