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

[pspp] / src / output / charts / roc-chart-cairo.c

diff --git a/src/output/charts/roc-chart-cairo.c b/src/output/charts/roc-chart-cairo.c
index 2ac494e3cd16f9549be3ca49de1699002e8a8f47..910d6152f0a7f64140b67cae932aa60a9bc7a652 100644 (file)
--- a/src/output/charts/roc-chart-cairo.c
+++ b/src/output/charts/roc-chart-cairo.c
@@ -27,20 +27,22 @@
 #define _(msgid) gettext (msgid)
 
 void
-xrchart_draw_roc (const struct chart_item *chart_item, cairo_t *cr,
+xrchart_draw_roc (const struct chart *chart, cairo_t *cr,
                   struct xrchart_geometry *geom)
 {
-  const struct roc_chart *rc = to_roc_chart (chart_item);
+  const struct roc_chart *rc = to_roc_chart (chart);
   size_t i;
 
   xrchart_write_title (cr, geom, _("ROC Curve"));
   xrchart_write_xlabel (cr, geom, _("1 - Specificity"));
   xrchart_write_ylabel (cr, geom, _("Sensitivity"));
 
-  xrchart_write_xscale (cr, geom, 0, 1);
-  xrchart_write_yscale (cr, geom, 0, 1);
+  if (! xrchart_write_xscale (cr, geom, 0, 1))
+    return;
+  if (! xrchart_write_yscale (cr, geom, 0, 1))
+    return;
 
-  if ( rc->reference )
+  if (rc->reference)
     {
       xrchart_line (cr, geom, 1.0, 0,
                     0.0, 1.0,