#include <config.h>
#include <stdio.h>
-#include <plot.h>
#include <math.h>
#include <gsl/gsl_histogram.h>
#include <gsl/gsl_randist.h>
#include <output/charts/plot-hist.h>
#include <output/charts/plot-chart.h>
+#include <output/chart-provider.h>
#include <data/variable.h>
+#include <libpspp/cast.h>
#include <libpspp/hash.h>
#include <output/chart.h>
#include <math/histogram.h>
#include "gettext.h"
#define _(msgid) gettext (msgid)
+static const struct chart_class histogram_chart_class;
+
/* Write the legend of the chart */
static void
-histogram_write_legend (struct chart *ch, double n, double mean, double stddev)
+histogram_write_legend (cairo_t *cr, const struct chart_geometry *geom,
+ double n, double mean, double stddev)
{
- char buf[100];
-
- if (!ch)
- return ;
-
- pl_savestate_r (ch->lp);
+ double y = geom->data_bottom;
+ cairo_save (cr);
- sprintf (buf, "N = %.2f", n);
- pl_move_r (ch->lp, ch->legend_left, ch->data_bottom);
- pl_alabel_r (ch->lp, 0, 'b', buf);
+ if (n != SYSMIS)
+ {
+ char *buf = xasprintf ("N = %.2f", n);
+ cairo_move_to (cr, geom->legend_left, y);
+ chart_label (cr, 'l', 'b', geom->font_size, buf);
+ y += geom->font_size * 1.5;
+ free (buf);
+ }
- sprintf (buf, "Mean = %.1f", mean);
- pl_fmove_r (ch->lp,ch->legend_left,ch->data_bottom + ch->font_size * 1.5);
- pl_alabel_r (ch->lp, 0, 'b', buf);
+ if (mean != SYSMIS)
+ {
+ char *buf = xasprintf ("Mean = %.1f", mean);
+ cairo_move_to (cr,geom->legend_left, y);
+ chart_label (cr, 'l', 'b', geom->font_size, buf);
+ y += geom->font_size * 1.5;
+ free (buf);
+ }
- sprintf (buf, "Std. Dev = %.2f", stddev);
- pl_fmove_r (ch->lp, ch->legend_left, ch->data_bottom + ch->font_size * 1.5 * 2);
- pl_alabel_r (ch->lp, 0, 'b', buf);
+ if (stddev != SYSMIS)
+ {
+ char *buf = xasprintf ("Std. Dev = %.2f", stddev);
+ cairo_move_to (cr, geom->legend_left, y);
+ chart_label (cr, 'l', 'b', geom->font_size, buf);
+ free (buf);
+ }
- pl_restorestate_r (ch->lp);
+ cairo_restore (cr);
}
-static void hist_draw_bar (struct chart *ch, const struct histogram *hist, int bar);
-
-
static void
-hist_draw_bar (struct chart *ch, const struct histogram *hist, int bar)
+hist_draw_bar (cairo_t *cr, const struct chart_geometry *geom,
+ const gsl_histogram *h, int bar)
{
- if (!ch)
- return ;
-
- {
- double upper;
- double lower;
- double height;
-
- const size_t bins = gsl_histogram_bins (hist->gsl_hist);
- const double x_pos = (ch->data_right - ch->data_left) * bar / (double) bins ;
- const double width = (ch->data_right - ch->data_left) / (double) bins ;
-
- assert ( 0 == gsl_histogram_get_range (hist->gsl_hist, bar, &lower, &upper));
-
- assert ( upper >= lower);
-
- height = gsl_histogram_get (hist->gsl_hist, bar) *
- (ch->data_top - ch->data_bottom) / gsl_histogram_max_val (hist->gsl_hist);
-
- pl_savestate_r (ch->lp);
- pl_move_r (ch->lp,ch->data_left, ch->data_bottom);
- pl_fillcolorname_r (ch->lp, ch->fill_colour);
- pl_filltype_r (ch->lp,1);
-
-
- pl_fboxrel_r (ch->lp,
- x_pos, 0,
- x_pos + width, height);
-
- pl_restorestate_r (ch->lp);
-
- draw_tick (ch, TICK_ABSCISSA,
- x_pos + width / 2.0, "%g", (upper + lower) / 2.0);
- }
+ double upper;
+ double lower;
+ double height;
+
+ const size_t bins = gsl_histogram_bins (h);
+ const double x_pos = (geom->data_right - geom->data_left) * bar / (double) bins ;
+ const double width = (geom->data_right - geom->data_left) / (double) bins ;
+
+ assert ( 0 == gsl_histogram_get_range (h, bar, &lower, &upper));
+
+ assert ( upper >= lower);
+
+ height = gsl_histogram_get (h, bar) *
+ (geom->data_top - geom->data_bottom) / gsl_histogram_max_val (h);
+
+ cairo_rectangle (cr, geom->data_left + x_pos, geom->data_bottom,
+ width, height);
+ cairo_save (cr);
+ cairo_set_source_rgb (cr,
+ geom->fill_colour.red / 255.0,
+ geom->fill_colour.green / 255.0,
+ geom->fill_colour.blue / 255.0);
+ cairo_fill_preserve (cr);
+ cairo_restore (cr);
+ cairo_stroke (cr);
+
+ draw_tick (cr, geom, TICK_ABSCISSA,
+ x_pos + width / 2.0, "%g", (upper + lower) / 2.0);
}
-
-
-void
-histogram_plot (const struct histogram *hist,
- const char *label,
- const struct moments1 *m)
+struct histogram_chart
+ {
+ struct chart chart;
+ gsl_histogram *gsl_hist;
+ char *label;
+ double n;
+ double mean;
+ double stddev;
+ bool show_normal;
+ };
+
+/* Plots a histogram of the data in HIST with the given LABEL.
+ Labels the histogram with each of N, MEAN, and STDDEV that is
+ not SYSMIS. If all three are not SYSMIS and SHOW_NORMAL is
+ true, also draws a normal curve on the histogram. */
+struct chart *
+histogram_chart_create (const struct histogram *hist, const char *label,
+ double n, double mean, double stddev,
+ bool show_normal)
{
- double mean, var, n;
-
- moments1_calculate (m, &n, &mean, &var, NULL, NULL);
-
- histogram_plot_n (hist, label, n, mean, sqrt(var), m);
+ struct histogram_chart *h;
+
+ h = xmalloc (sizeof *h);
+ chart_init (&h->chart, &histogram_chart_class);
+ h->gsl_hist = hist->gsl_hist ? gsl_histogram_clone (hist->gsl_hist) : NULL;
+ h->label = xstrdup (label);
+ h->n = n;
+ h->mean = mean;
+ h->stddev = stddev;
+ h->show_normal = show_normal;
+ return &h->chart;
}
-
-/* This function is deprecated. Don't use it in new code */
-void
-histogram_plot_n (const struct histogram *hist,
- const char *label,
- double n, double mean, double stddev,
- bool show_normal)
+static void
+histogram_chart_draw (const struct chart *chart, cairo_t *cr,
+ struct chart_geometry *geom)
{
+ struct histogram_chart *h = UP_CAST (chart, struct histogram_chart, chart);
int i;
int bins;
- struct chart *ch = chart_create ();
-
- chart_write_title (ch, _("HISTOGRAM"));
+ chart_write_title (cr, geom, _("HISTOGRAM"));
- chart_write_ylabel (ch, _("Frequency"));
- chart_write_xlabel (ch, label);
+ chart_write_ylabel (cr, geom, _("Frequency"));
+ chart_write_xlabel (cr, geom, h->label);
- if ( ! hist ) /* If this happens, probably all values are SYSMIS */
+ if (h->gsl_hist == NULL)
{
- chart_submit (ch);
+ /* Probably all values are SYSMIS. */
return;
}
- else
- {
- bins = gsl_histogram_bins (hist->gsl_hist);
- }
- chart_write_yscale (ch, 0, gsl_histogram_max_val (hist->gsl_hist), 5);
+ bins = gsl_histogram_bins (h->gsl_hist);
+
+ chart_write_yscale (cr, geom, 0, gsl_histogram_max_val (h->gsl_hist), 5);
- for ( i = 0 ; i < bins ; ++i )
- hist_draw_bar (ch, hist, i);
+ for (i = 0; i < bins; i++)
+ hist_draw_bar (cr, geom, h->gsl_hist, i);
- histogram_write_legend (ch, n, mean, stddev);
+ histogram_write_legend (cr, geom, h->n, h->mean, h->stddev);
- if (show_normal)
+ if (h->show_normal
+ && h->n != SYSMIS && h->mean != SYSMIS && h->stddev != SYSMIS)
{
/* Draw the normal curve */
+ double d;
+ double x_min, x_max, not_used;
+ double abscissa_scale;
+ double ordinate_scale;
+ double range;
- double d ;
- double x_min, x_max, not_used ;
- double abscissa_scale ;
- double ordinate_scale ;
- double range ;
-
- gsl_histogram_get_range (hist->gsl_hist, 0, &x_min, ¬_used);
+ gsl_histogram_get_range (h->gsl_hist, 0, &x_min, ¬_used);
range = not_used - x_min;
- gsl_histogram_get_range (hist->gsl_hist, bins - 1, ¬_used, &x_max);
+ gsl_histogram_get_range (h->gsl_hist, bins - 1, ¬_used, &x_max);
- abscissa_scale = (ch->data_right - ch->data_left) / (x_max - x_min);
- ordinate_scale = (ch->data_top - ch->data_bottom) /
- gsl_histogram_max_val (hist->gsl_hist) ;
+ abscissa_scale = (geom->data_right - geom->data_left) / (x_max - x_min);
+ ordinate_scale = (geom->data_top - geom->data_bottom) /
+ gsl_histogram_max_val (h->gsl_hist);
- pl_move_r (ch->lp, ch->data_left, ch->data_bottom);
- for ( d = ch->data_left;
- d <= ch->data_right ;
- d += (ch->data_right - ch->data_left) / 100.0)
+ cairo_move_to (cr, geom->data_left, geom->data_bottom);
+ for (d = geom->data_left;
+ d <= geom->data_right;
+ d += (geom->data_right - geom->data_left) / 100.0)
{
- const double x = (d - ch->data_left) / abscissa_scale + x_min ;
- const double y = n * range *
- gsl_ran_gaussian_pdf (x - mean, stddev);
+ const double x = (d - geom->data_left) / abscissa_scale + x_min;
+ const double y = h->n * range *
+ gsl_ran_gaussian_pdf (x - h->mean, h->stddev);
- pl_fcont_r (ch->lp, d, ch->data_bottom + y * ordinate_scale);
+ cairo_line_to (cr, d, geom->data_bottom + y * ordinate_scale);
}
- pl_endpath_r (ch->lp);
+ cairo_stroke (cr);
}
-
- chart_submit (ch);
}
+static void
+histogram_chart_destroy (struct chart *chart)
+{
+ struct histogram_chart *h = UP_CAST (chart, struct histogram_chart, chart);
+ if (h->gsl_hist != NULL)
+ gsl_histogram_free (h->gsl_hist);
+ free (h->label);
+ free (h);
+}
+
+static const struct chart_class histogram_chart_class =
+ {
+ histogram_chart_draw,
+ histogram_chart_destroy
+ };
projects / pspp-builds.git / blobdiff