output-item: Collapse the inheritance hierarchy into a single struct.

[pspp] / src / output / charts / scatterplot-cairo.c

diff --git a/src/output/charts/scatterplot-cairo.c b/src/output/charts/scatterplot-cairo.c
index 86e54c6e5abc1ea826364d571270d81219450054..17307497c783f7b2c4d5bea00634170d955f05b9 100644 (file)
--- a/src/output/charts/scatterplot-cairo.c
+++ b/src/output/charts/scatterplot-cairo.c
@@ -31,10 +31,10 @@
 static const struct xrchart_colour black = {0,0,0};
 
 void
-xrchart_draw_scatterplot (const struct chart_item *chart_item, cairo_t *cr,
+xrchart_draw_scatterplot (const struct chart *chart, cairo_t *cr,
                          struct xrchart_geometry *geom)
 {
-  const struct scatterplot_chart *spc = to_scatterplot_chart (chart_item);
+  const struct scatterplot_chart *spc = to_scatterplot_chart (chart);
   struct casereader *data;
   struct ccase *c;
   /* While reading the cases, a list with categories of the byvar is build */
@@ -50,9 +50,11 @@ xrchart_draw_scatterplot (const struct chart_item *chart_item, cairo_t *cr,
   if (spc->byvar)
     byvar_width = var_get_width (spc->byvar);
 
-  xrchart_write_xscale (cr, geom, spc->x_min, spc->x_max);
-  xrchart_write_yscale (cr, geom, spc->y_min, spc->y_max);
-  xrchart_write_title (cr, geom, _("Scatterplot %s"), chart_item->title);
+  if (! xrchart_write_xscale (cr, geom, spc->x_min, spc->x_max))
+    return;
+  if (! xrchart_write_yscale (cr, geom, spc->y_min, spc->y_max))
+    return;
+  xrchart_write_title (cr, geom, _("Scatterplot %s"), chart->title);
   xrchart_write_xlabel (cr, geom, spc->xlabel);
   xrchart_write_ylabel (cr, geom, spc->ylabel);