X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Foutput%2Fcairo-chart.c;h=00eb98f5f91b0915ad6c129934c3e16e6dfaef25;hb=81dece3642da9bdcbdec4aa09b0c2008c86d6161;hp=342a46e1a07154d11abf3ed51c49e9d233acc10c;hpb=078b003b3171c6158a3419a01189b9658896f470;p=pspp

diff --git a/src/output/cairo-chart.c b/src/output/cairo-chart.c
index 342a46e1a0..00eb98f5f9 100644
--- a/src/output/cairo-chart.c
+++ b/src/output/cairo-chart.c
@@ -1,5 +1,6 @@
 /* PSPP - a program for statistical analysis.
-   Copyright (C) 2004, 2009, 2010, 2011, 2014, 2015 Free Software Foundation, Inc.
+   Copyright (C) 2004, 2009, 2010, 2011, 2014, 2015,
+   2020 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -308,7 +309,7 @@ draw_tick_internal (cairo_t *cr, const struct xrchart_geometry *geom,
 
       if (orientation == SCALE_ABSCISSA)
 	{
-	  if ( rotated)
+	  if (rotated)
 	    xrchart_label_rotate (cr, 'l', 'c', geom->font_size, s, -G_PI_4);
 	  else
 	    xrchart_label (cr, 'c', 't', geom->font_size, s);
@@ -365,7 +366,7 @@ xrchart_text_extents (cairo_t *cr, const struct xrchart_geometry *geom,
   pango_font_description_free (desc);
 }
 
-static void
+static bool
 xrchart_write_scale (cairo_t *cr, struct xrchart_geometry *geom,
 		     double smin, double smax, enum tick_orientation orient)
 {
@@ -379,6 +380,9 @@ xrchart_write_scale (cairo_t *cr, struct xrchart_geometry *geom,
   char *tick_format_string;
   bool tickoversize = false;
 
+  if (smax == smin)
+    return false;
+
   chart_get_scale (smax, smin, &lower, &interval, &ticks);
 
   tick_format_string = chart_get_ticks_format (lower, interval, ticks, &tickscale);
@@ -417,22 +421,24 @@ xrchart_write_scale (cairo_t *cr, struct xrchart_geometry *geom,
       pos += interval;
     }
   free(tick_format_string);
+
+  return true;
 }
 
 /* Set the scale for the ordinate */
-void
+bool
 xrchart_write_yscale (cairo_t *cr, struct xrchart_geometry *geom,
                     double smin, double smax)
 {
-  xrchart_write_scale (cr, geom, smin, smax, SCALE_ORDINATE);
+  return xrchart_write_scale (cr, geom, smin, smax, SCALE_ORDINATE);
 }
 
 /* Set the scale for the abscissa */
-void
+bool
 xrchart_write_xscale (cairo_t *cr, struct xrchart_geometry *geom,
 		      double smin, double smax)
 {
-  xrchart_write_scale (cr, geom, smin, smax, SCALE_ABSCISSA);
+  return xrchart_write_scale (cr, geom, smin, smax, SCALE_ABSCISSA);
 }
 
 
@@ -469,7 +475,7 @@ xrchart_write_legend (cairo_t *cr, const struct xrchart_geometry *geom)
   const int swatch = 20;
   const int legend_top = geom->axis[SCALE_ORDINATE].data_max;
   const int legend_bottom = legend_top -
-    (vstep * geom->n_datasets + 2 * ypad );
+    (vstep * geom->n_datasets + 2 * ypad);
 
   cairo_save (cr);
 
@@ -478,7 +484,7 @@ xrchart_write_legend (cairo_t *cr, const struct xrchart_geometry *geom)
                    legend_bottom - legend_top);
   cairo_stroke (cr);
 
-  for (i = 0 ; i < geom->n_datasets ; ++i )
+  for (i = 0 ; i < geom->n_datasets ; ++i)
     {
       const int ypos = legend_top - vstep * (i + 1);
       const int xpos = geom->legend_left + xpad;
@@ -578,10 +584,10 @@ xrchart_line(cairo_t *cr, const struct xrchart_geometry *geom,
   double x1, y1;
   double x2, y2;
 
-  if ( lim_dim == XRCHART_DIM_Y )
+  if (lim_dim == XRCHART_DIM_Y)
     {
-      x1 = ( limit1 - intercept ) / slope;
-      x2 = ( limit2 - intercept ) / slope;
+      x1 = (limit1 - intercept) / slope;
+      x2 = (limit2 - intercept) / slope;
       y1 = limit1;
       y2 = limit2;
     }