/* PSPP - a program for statistical analysis.
- Copyright (C) 2009, 2011, 2014 Free Software Foundation, Inc.
+ Copyright (C) 2009, 2011, 2014, 2015 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
double lower;
double height;
- assert ( 0 == gsl_histogram_get_range (h, bar, &lower, &upper));
- assert ( upper >= lower);
+ assert (0 == gsl_histogram_get_range (h, bar, &lower, &upper));
+ assert (upper >= lower);
const double x_pos =
(lower - geom->axis[SCALE_ABSCISSA].min) * geom->axis[SCALE_ABSCISSA].scale
}
void
-xrchart_draw_histogram (const struct chart_item *chart_item, cairo_t *cr,
+xrchart_draw_histogram (const struct chart *chart, cairo_t *cr,
struct xrchart_geometry *geom)
{
- struct histogram_chart *h = to_histogram_chart (chart_item);
+ struct histogram_chart *h = to_histogram_chart (chart);
int i;
int bins;
xrchart_write_title (cr, geom, _("HISTOGRAM"));
xrchart_write_ylabel (cr, geom, _("Frequency"));
- xrchart_write_xlabel (cr, geom, chart_item_get_title (chart_item));
+ xrchart_write_xlabel (cr, geom, chart_get_title (chart));
if (h->gsl_hist == NULL)
{
return;
}
- xrchart_write_yscale (cr, geom, 0, gsl_histogram_max_val (h->gsl_hist));
- xrchart_write_xscale (cr, geom, gsl_histogram_min (h->gsl_hist),
- gsl_histogram_max (h->gsl_hist));
+ if (! xrchart_write_yscale (cr, geom, 0, gsl_histogram_max_val (h->gsl_hist)))
+ return;
+ if (! xrchart_write_xscale (cr, geom, gsl_histogram_min (h->gsl_hist),
+ gsl_histogram_max (h->gsl_hist)))
+ return;
/* Draw the ticks and compute if the rendered tick text is wider than the bin */
/* Therefore the pdf has to be scaled accordingly such that the integrals are equal */
ordinate_scale = binwidth * gsl_histogram_sum(h->gsl_hist);
+ /* Clip normal curve to the rectangle formed by the axes. */
+ cairo_save (cr);
+ cairo_rectangle (cr, geom->axis[SCALE_ABSCISSA].data_min, geom->axis[SCALE_ORDINATE].data_min,
+ geom->axis[SCALE_ABSCISSA].data_max - geom->axis[SCALE_ABSCISSA].data_min,
+ geom->axis[SCALE_ORDINATE].data_max - geom->axis[SCALE_ORDINATE].data_min);
+ cairo_clip (cr);
+
cairo_move_to (cr, geom->axis[SCALE_ABSCISSA].data_min, geom->axis[SCALE_ORDINATE].data_min);
for (x = geom->axis[SCALE_ABSCISSA].min;
x <= geom->axis[SCALE_ABSCISSA].max;
cairo_line_to (cr, x_pos, y_pos);
}
cairo_stroke (cr);
+
+ cairo_restore (cr);
}
}