Add GRAPH command initially with just scatterplots and histograms.

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

diff --git a/src/output/charts/scatterplot.c b/src/output/charts/scatterplot.c
new file mode 100644 (file)
index 0000000..920bc17
--- /dev/null
+++ b/src/output/charts/scatterplot.c
@@ -0,0 +1,73 @@
+/* PSPP - a program for statistical analysis.
+   Copyright (C) 2014 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/scatterplot.h"
+
+#include <gsl/gsl_cdf.h>
+
+#include "data/casereader.h"
+#include "libpspp/cast.h"
+#include "output/chart-item-provider.h"
+
+#include "gl/minmax.h"
+
+
+/* Creates a scatterplot 
+
+   The caller retains ownership of READER. */
+struct scatterplot_chart *
+scatterplot_create (const struct casereader *reader, 
+                   const struct variable *xvar, 
+                   const struct variable *yvar,
+                   const struct variable *byvar,
+                   bool *byvar_overflow,
+                   const char *label,
+                   double xmin, double xmax, double ymin, double ymax)
+{
+  struct scatterplot_chart *spc;
+
+  spc = xzalloc (sizeof *spc);
+  chart_item_init (&spc->chart_item, &scatterplot_chart_class, label);
+  spc->data = casereader_clone (reader);
+
+  spc->y_min = ymin;
+  spc->y_max = ymax;
+
+  spc->x_min = xmin;
+  spc->x_max = xmax;
+
+  spc->xvar = xvar;
+  spc->yvar = yvar;
+  spc->byvar = byvar;
+  spc->byvar_overflow = byvar_overflow;
+
+  return spc;
+}
+
+static void
+scatterplot_chart_destroy (struct chart_item *chart_item)
+{
+  struct scatterplot_chart *spc = to_scatterplot_chart (chart_item);
+  casereader_destroy (spc->data);
+  free (spc);
+}
+
+const struct chart_item_class scatterplot_chart_class =
+  {
+    scatterplot_chart_destroy
+  };