/* PSPP - a program for statistical analysis.
- Copyright (C) 2004, 2009 Free Software Foundation, Inc.
+ Copyright (C) 2004, 2009, 2011 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
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/piechart.h>
-
-#include <assert.h>
-#include <float.h>
-#include <gsl/gsl_math.h>
-#include <math.h>
-#include <stdio.h>
-
-#include <data/value-labels.h>
-#include <libpspp/str.h>
-#include <output/charts/plot-chart.h>
-#include <output/chart-provider.h>
-
-#include "minmax.h"
+#include "output/charts/piechart.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(plPlotter *,
- double centre_x, double centre_y,
- double radius,
- double start_angle, double segment_angle,
- const char *colour) ;
+#include <stdlib.h>
+#include "libpspp/cast.h"
+#include "libpspp/str.h"
+#include "output/chart-item-provider.h"
+#include "gl/xalloc.h"
/* Creates and returns a chart that will render a piechart with
the given TITLE and the N_SLICES described in SLICES. */
-struct chart *
+struct chart_item *
piechart_create (const char *title, const struct slice *slices, int n_slices)
{
struct piechart *pie;
int i;
pie = xmalloc (sizeof *pie);
- chart_init (&pie->chart, &piechart_class);
- pie->title = xstrdup (title);
+ chart_item_init (&pie->chart_item, &piechart_class, title);
pie->slices = xnmalloc (n_slices, sizeof *pie->slices);
for (i = 0; i < n_slices; i++)
{
dst->magnitude = src->magnitude;
}
pie->n_slices = n_slices;
- return &pie->chart;
-}
-
-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;
-
- chart_geometry_init (lp, &geom);
-
- 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;
-
- 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 (lp, &geom, "%s", pie->title);
-
- 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 < pie->n_slices ; ++i )
- {
- const double segment_angle =
- pie->slices[i].magnitude / total_magnitude * 2 * M_PI ;
-
- const double label_x = centre_x -
- radius * sin(angle + segment_angle/2.0);
-
- const double label_y = centre_y +
- radius * cos(angle + segment_angle/2.0);
-
- /* Fill the segment */
- 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 (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 (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 (lp,0);
- pl_fcircle_r (lp, centre_x, centre_y, radius);
-
- chart_geometry_free (lp);
-}
-
-/* Fill a segment with the current fill colour */
-static void
-fill_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);
-
- const double stop_x =
- x0 - radius * sin(start_angle + segment_angle);
-
- const double stop_y =
- y0 + radius * cos(start_angle + segment_angle);
-
- assert(segment_angle <= 2 * M_PI);
- assert(segment_angle >= 0);
-
- if ( segment_angle > M_PI )
- {
- /* Then we must draw it in two halves */
- 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(lp, x0, y0);
-
- pl_cont_r(lp, stop_x, stop_y);
- pl_cont_r(lp, start_x, start_y);
-
- pl_arc_r(lp,
- x0, y0,
- stop_x, stop_y,
- start_x, start_y
- );
-
- pl_endpath_r(lp);
- }
-}
-
-/* Draw a single slice of the pie */
-static void
-draw_segment(plPlotter *lp,
- double x0, double y0,
- double radius,
- double start_angle, double segment_angle,
- const char *colour)
-{
- const double start_x = x0 - radius * sin(start_angle);
- const double start_y = y0 + radius * cos(start_angle);
-
- pl_savestate_r(lp);
-
- pl_savestate_r(lp);
- pl_colorname_r(lp, colour);
-
- pl_pentype_r(lp,1);
- pl_filltype_r(lp,1);
-
- fill_segment(lp, x0, y0, radius, start_angle, segment_angle);
- pl_restorestate_r(lp);
-
- /* Draw line dividing segments */
- pl_pentype_r(lp, 1);
- pl_fline_r(lp, x0, y0, start_x, start_y);
-
-
- pl_restorestate_r(lp);
+ return &pie->chart_item;
}
static void
-piechart_destroy (struct chart *chart)
+piechart_destroy (struct chart_item *chart_item)
{
- struct piechart *pie = (struct piechart *) chart;
+ struct piechart *pie = to_piechart (chart_item);
int i;
- free (pie->title);
for (i = 0; i < pie->n_slices; i++)
{
struct slice *slice = &pie->slices[i];
free (pie);
}
-static const struct chart_class piechart_class =
+const struct chart_item_class piechart_class =
{
- piechart_draw,
piechart_destroy
};
projects / pspp-builds.git / blobdiff