Examine: Added the /PLOT=SPREADLEVEL option

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

diff --git a/src/output/charts/spreadlevel-cairo.c b/src/output/charts/spreadlevel-cairo.c
new file mode 100644 (file)
index 0000000..eeb3c81
--- /dev/null
+++ b/src/output/charts/spreadlevel-cairo.c
@@ -0,0 +1,49 @@
+/* PSPP - a program for statistical analysis.
+   Copyright (C) 2012 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
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+#include "output/charts/spreadlevel-plot.h"
+
+#include <math.h>
+
+#include "output/cairo-chart.h"
+
+#include "gettext.h"
+#define _(msgid) gettext (msgid)
+
+void
+xrchart_draw_spreadlevel (const struct chart_item *chart_item, cairo_t *cr,
+                    struct xrchart_geometry *geom)
+{
+  const struct spreadlevel_plot_chart *sl = to_spreadlevel_plot_chart (chart_item);
+  size_t i;
+
+  const char *name = chart_item_get_title (chart_item);
+
+  xrchart_write_title (cr, geom, _("Spread vs. Level Plot of %s"), name);
+  xrchart_write_xlabel (cr, geom, _("Level"));
+  xrchart_write_ylabel (cr, geom, _("Spread"));
+  
+
+  xrchart_write_xscale (cr, geom, sl->x_lower, sl->x_upper, 5);
+  xrchart_write_yscale (cr, geom, sl->y_lower, sl->y_upper, 5);
+
+  for (i = 0 ; i < sl->n_data; ++i)
+    {
+      xrchart_datum (cr, geom, 0, sl->data[i].x, sl->data[i].y);
+    }
+}