#include <config.h>
-#include <float.h>
+#include <output/charts/piechart.h>
+
#include <assert.h>
+#include <float.h>
#include <gsl/gsl_math.h>
#include <math.h>
#include <stdio.h>
-
-#include <output/charts/piechart.h>
-#include <output/charts/plot-chart.h>
-
-#include <output/chart.h>
-#include <libpspp/str.h>
#include <data/value-labels.h>
+#include <libpspp/str.h>
+#include <output/charts/plot-chart.h>
+#include <output/chart-provider.h>
#include "minmax.h"
+struct piechart
+ {
+ struct chart chart;
+ char *title;
+ struct slice *slices;
+ int n_slices;
+ };
+
+static const struct chart_class piechart_class;
+
/* Draw a single slice of the pie */
static void
-draw_segment(struct chart *ch,
+draw_segment(plPlotter *,
double centre_x, double centre_y,
double radius,
double start_angle, double segment_angle,
-/* Draw a piechart */
-void
-piechart_plot(const char *title, const struct slice *slices, int n_slices)
+/* Creates and returns a chart that will render a piechart with
+ the given TITLE and the N_SLICES described in SLICES. */
+struct chart *
+piechart_create (const char *title, const struct slice *slices, int n_slices)
{
+ struct piechart *pie;
int i;
- double total_magnitude=0;
- struct chart *ch = chart_create();
+ pie = xmalloc (sizeof *pie);
+ chart_init (&pie->chart, &piechart_class);
+ pie->title = xstrdup (title);
+ pie->slices = xnmalloc (n_slices, sizeof *pie->slices);
+ for (i = 0; i < n_slices; i++)
+ {
+ const struct slice *src = &slices[i];
+ struct slice *dst = &pie->slices[i];
- const double left_label = ch->data_left +
- (ch->data_right - ch->data_left)/10.0;
+ ds_init_string (&dst->label, &src->label);
+ dst->magnitude = src->magnitude;
+ }
+ pie->n_slices = n_slices;
+ return &pie->chart;
+}
- const double right_label = ch->data_right -
- (ch->data_right - ch->data_left)/10.0;
+static void
+piechart_draw (const struct chart *chart, plPlotter *lp)
+{
+ struct piechart *pie = (struct piechart *) chart;
+ struct chart_geometry geom;
+ double total_magnitude;
+ double left_label, right_label;
+ double centre_x, centre_y;
+ double radius;
+ double angle;
+ int i;
- const double centre_x = (ch->data_right + ch->data_left ) / 2.0 ;
- const double centre_y = (ch->data_top + ch->data_bottom ) / 2.0 ;
+ chart_geometry_init (lp, &geom);
- const double radius = MIN(
- 5.0 / 12.0 * (ch->data_top - ch->data_bottom),
- 1.0 / 4.0 * (ch->data_right - ch->data_left)
- );
+ left_label = geom.data_left + (geom.data_right - geom.data_left)/10.0;
+ right_label = geom.data_right - (geom.data_right - geom.data_left)/10.0;
- double angle;
+ centre_x = (geom.data_right + geom.data_left) / 2.0 ;
+ centre_y = (geom.data_top + geom.data_bottom) / 2.0 ;
+ radius = MIN (5.0 / 12.0 * (geom.data_top - geom.data_bottom),
+ 1.0 / 4.0 * (geom.data_right - geom.data_left));
- chart_write_title(ch, "%s", title);
+ chart_write_title (lp, &geom, "%s", pie->title);
- for (i = 0 ; i < n_slices ; ++i )
- total_magnitude += slices[i].magnitude;
+ total_magnitude = 0.0;
+ for (i = 0; i < pie->n_slices; i++)
+ total_magnitude += pie->slices[i].magnitude;
angle = 0.0;
- for (i = 0 ; i < n_slices ; ++i )
+ for (i = 0; i < pie->n_slices ; ++i )
{
const double segment_angle =
- slices[i].magnitude / total_magnitude * 2 * M_PI ;
+ pie->slices[i].magnitude / total_magnitude * 2 * M_PI ;
const double label_x = centre_x -
radius * sin(angle + segment_angle/2.0);
radius * cos(angle + segment_angle/2.0);
/* Fill the segment */
- draw_segment(ch,
- centre_x, centre_y, radius,
- angle, segment_angle,
- data_colour[i % N_CHART_COLOURS]);
+ draw_segment (lp,
+ centre_x, centre_y, radius,
+ angle, segment_angle,
+ data_colour[i % N_CHART_COLOURS]);
/* Now add the labels */
if ( label_x < centre_x )
{
- pl_line_r(ch->lp, label_x, label_y,
- left_label, label_y );
- pl_moverel_r(ch->lp,0,5);
- pl_alabel_r (ch->lp, 0, 0, ds_cstr (&slices[i].label));
+ pl_line_r (lp, label_x, label_y, left_label, label_y );
+ pl_moverel_r (lp, 0, 5);
+ pl_alabel_r (lp, 0, 0, ds_cstr (&pie->slices[i].label));
}
else
{
- pl_line_r(ch->lp,
- label_x, label_y,
- right_label, label_y
- );
- pl_moverel_r(ch->lp,0,5);
- pl_alabel_r (ch->lp, 'r', 0, ds_cstr (&slices[i].label));
+ pl_line_r (lp, label_x, label_y, right_label, label_y);
+ pl_moverel_r (lp, 0, 5);
+ pl_alabel_r (lp, 'r', 0, ds_cstr (&pie->slices[i].label));
}
angle += segment_angle;
-
}
/* Draw an outline to the pie */
- pl_filltype_r(ch->lp,0);
- pl_fcircle_r (ch->lp, centre_x, centre_y, radius);
+ pl_filltype_r (lp,0);
+ pl_fcircle_r (lp, centre_x, centre_y, radius);
- chart_submit(ch);
+ chart_geometry_free (lp);
}
-static void
-fill_segment(struct chart *ch,
- double x0, double y0,
- double radius,
- double start_angle, double segment_angle) ;
-
-
/* Fill a segment with the current fill colour */
static void
-fill_segment(struct chart *ch,
+fill_segment(plPlotter *lp,
double x0, double y0,
double radius,
double start_angle, double segment_angle)
if ( segment_angle > M_PI )
{
/* Then we must draw it in two halves */
- fill_segment(ch, x0, y0, radius, start_angle, segment_angle / 2.0 );
- fill_segment(ch, x0, y0, radius, start_angle + segment_angle / 2.0,
+ fill_segment(lp, x0, y0, radius, start_angle, segment_angle / 2.0 );
+ fill_segment(lp, x0, y0, radius, start_angle + segment_angle / 2.0,
segment_angle / 2.0 );
}
else
{
- pl_move_r(ch->lp, x0, y0);
+ pl_move_r(lp, x0, y0);
- pl_cont_r(ch->lp, stop_x, stop_y);
- pl_cont_r(ch->lp, start_x, start_y);
+ pl_cont_r(lp, stop_x, stop_y);
+ pl_cont_r(lp, start_x, start_y);
- pl_arc_r(ch->lp,
+ pl_arc_r(lp,
x0, y0,
stop_x, stop_y,
start_x, start_y
);
- pl_endpath_r(ch->lp);
+ pl_endpath_r(lp);
}
}
-
-
/* Draw a single slice of the pie */
static void
-draw_segment(struct chart *ch,
+draw_segment(plPlotter *lp,
double x0, double y0,
double radius,
double start_angle, double segment_angle,
const double start_x = x0 - radius * sin(start_angle);
const double start_y = y0 + radius * cos(start_angle);
- pl_savestate_r(ch->lp);
+ pl_savestate_r(lp);
- pl_savestate_r(ch->lp);
- pl_colorname_r(ch->lp, colour);
+ pl_savestate_r(lp);
+ pl_colorname_r(lp, colour);
- pl_pentype_r(ch->lp,1);
- pl_filltype_r(ch->lp,1);
+ pl_pentype_r(lp,1);
+ pl_filltype_r(lp,1);
- fill_segment(ch, x0, y0, radius, start_angle, segment_angle);
- pl_restorestate_r(ch->lp);
+ fill_segment(lp, x0, y0, radius, start_angle, segment_angle);
+ pl_restorestate_r(lp);
/* Draw line dividing segments */
- pl_pentype_r(ch->lp, 1);
- pl_fline_r(ch->lp, x0, y0, start_x, start_y);
+ pl_pentype_r(lp, 1);
+ pl_fline_r(lp, x0, y0, start_x, start_y);
+
+ pl_restorestate_r(lp);
+}
- pl_restorestate_r(ch->lp);
+static void
+piechart_destroy (struct chart *chart)
+{
+ struct piechart *pie = (struct piechart *) chart;
+ int i;
+
+ free (pie->title);
+ for (i = 0; i < pie->n_slices; i++)
+ {
+ struct slice *slice = &pie->slices[i];
+ ds_destroy (&slice->label);
+ }
+ free (pie->slices);
+ free (pie);
}
+static const struct chart_class piechart_class =
+ {
+ piechart_draw,
+ piechart_destroy
+ };
projects / pspp-builds.git / blobdiff