/* PSPP - a program for statistical analysis.
- Copyright (C) 2004, 2008 Free Software Foundation, Inc.
+ Copyright (C) 2004, 2008, 2009 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
#include <config.h>
+#include <output/charts/box-whisker.h>
+
#include <math.h>
#include <assert.h>
-#include <libpspp/misc.h>
-
-#include <output/charts/box-whisker.h>
-#include <output/charts/plot-chart.h>
+#include <cairo/cairo.h>
-#include <output/chart.h>
+#include <libpspp/misc.h>
#include <math/chart-geometry.h>
#include <math/box-whisker.h>
+#include <output/chart.h>
+#include <output/chart-provider.h>
+#include <output/charts/plot-chart.h>
/* Draw a box-and-whiskers plot
*/
+struct box
+ {
+ struct box_whisker *bw;
+ char *label;
+ };
+
+struct boxplot
+ {
+ struct chart chart;
+ double y_min;
+ double y_max;
+ char *title;
+ struct box *boxes;
+ size_t n_boxes, boxes_allocated;
+ };
+
+static const struct chart_class boxplot_chart_class;
+
+struct boxplot *
+boxplot_create (double y_min, double y_max, const char *title)
+{
+ struct boxplot *boxplot = xmalloc (sizeof *boxplot);
+ chart_init (&boxplot->chart, &boxplot_chart_class);
+ boxplot->y_min = y_min;
+ boxplot->y_max = y_max;
+ boxplot->title = xstrdup (title);
+ boxplot->boxes = NULL;
+ boxplot->n_boxes = boxplot->boxes_allocated = 0;
+ return boxplot;
+}
+
+void
+boxplot_add_box (struct boxplot *boxplot,
+ struct box_whisker *bw, const char *label)
+{
+ struct box *box;
+ if (boxplot->n_boxes >= boxplot->boxes_allocated)
+ boxplot->boxes = x2nrealloc (boxplot->boxes, &boxplot->boxes_allocated,
+ sizeof *boxplot->boxes);
+ box = &boxplot->boxes[boxplot->n_boxes++];
+ box->bw = bw;
+ box->label = xstrdup (label);
+}
+
+struct chart *
+boxplot_get_chart (struct boxplot *boxplot)
+{
+ return &boxplot->chart;
+}
+
/* Draw an OUTLIER on the plot CH
* at CENTRELINE
*/
static void
-draw_case (struct chart *ch, double centreline,
+draw_case (cairo_t *cr, const struct chart_geometry *geom, double centreline,
const struct outlier *outlier)
{
+ double y = geom->data_bottom + (outlier->value - geom->y_min) * geom->ordinate_scale;
+ chart_draw_marker (cr, centreline, y,
+ outlier->extreme ? MARKER_ASTERISK : MARKER_CIRCLE,
+ 20);
-#define MARKER_CIRCLE 4
-#define MARKER_STAR 3
-
- pl_fmarker_r(ch->lp,
- centreline,
- ch->data_bottom + (outlier->value - ch->y_min) * ch->ordinate_scale,
- outlier->extreme ? MARKER_STAR : MARKER_CIRCLE,
- 20);
-
- pl_moverel_r(ch->lp, 10,0);
-
- pl_alabel_r(ch->lp, 'l', 'c', ds_cstr (&outlier->label));
+ cairo_move_to (cr, centreline + 10, y);
+ chart_label (cr, 'l', 'c', ds_cstr (&outlier->label));
}
-
-void
-boxplot_draw_boxplot (struct chart *ch,
- double box_centre,
- double box_width,
- const struct box_whisker *bw,
- const char *name)
+static void
+boxplot_draw_box (cairo_t *cr, const struct chart_geometry *geom,
+ double box_centre,
+ double box_width,
+ const struct box_whisker *bw,
+ const char *name)
{
double whisker[2];
double hinge[3];
box_whisker_whiskers (bw, whisker);
box_whisker_hinges (bw, hinge);
- box_bottom = ch->data_bottom + (hinge[0] - ch->y_min ) * ch->ordinate_scale;
-
- box_top = ch->data_bottom + (hinge[2] - ch->y_min ) * ch->ordinate_scale;
+ box_bottom = geom->data_bottom + (hinge[0] - geom->y_min ) * geom->ordinate_scale;
- bottom_whisker = ch->data_bottom + (whisker[0] - ch->y_min) *
- ch->ordinate_scale;
+ box_top = geom->data_bottom + (hinge[2] - geom->y_min ) * geom->ordinate_scale;
- top_whisker = ch->data_bottom + (whisker[1] - ch->y_min) * ch->ordinate_scale;
+ bottom_whisker = geom->data_bottom + (whisker[0] - geom->y_min) *
+ geom->ordinate_scale;
- pl_savestate_r(ch->lp);
+ top_whisker = geom->data_bottom + (whisker[1] - geom->y_min) * geom->ordinate_scale;
/* Draw the box */
- pl_savestate_r (ch->lp);
- pl_fillcolorname_r (ch->lp, ch->fill_colour);
- pl_filltype_r (ch->lp,1);
- pl_fbox_r (ch->lp,
- box_left,
- box_bottom,
- box_right,
- box_top);
-
- pl_restorestate_r (ch->lp);
+ cairo_rectangle (cr,
+ box_left,
+ box_bottom,
+ box_right - box_left,
+ box_top - box_bottom);
+ 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 (cr);
+ cairo_restore (cr);
+ cairo_stroke (cr);
/* Draw the median */
- pl_savestate_r (ch->lp);
- pl_linewidth_r (ch->lp, 5);
- pl_fline_r (ch->lp,
- box_left,
- ch->data_bottom + (hinge[1] - ch->y_min) * ch->ordinate_scale,
- box_right,
- ch->data_bottom + (hinge[1] - ch->y_min) * ch->ordinate_scale);
- pl_restorestate_r (ch->lp);
+ cairo_save (cr);
+ cairo_set_line_width (cr, cairo_get_line_width (cr) * 5);
+ cairo_move_to (cr,
+ box_left,
+ geom->data_bottom + (hinge[1] - geom->y_min) * geom->ordinate_scale);
+ cairo_line_to (cr,
+ box_right,
+ geom->data_bottom + (hinge[1] - geom->y_min) * geom->ordinate_scale);
+ cairo_stroke (cr);
+ cairo_restore (cr);
/* Draw the bottom whisker */
- pl_fline_r (ch->lp,
- box_left,
- bottom_whisker,
- box_right,
- bottom_whisker);
+ cairo_move_to (cr, box_left, bottom_whisker);
+ cairo_line_to (cr, box_right, bottom_whisker);
+ cairo_stroke (cr);
/* Draw top whisker */
- pl_fline_r (ch->lp,
- box_left,
- top_whisker,
- box_right,
- top_whisker);
-
+ cairo_move_to (cr, box_left, top_whisker);
+ cairo_line_to (cr, box_right, top_whisker);
+ cairo_stroke (cr);
/* Draw centre line.
(bottom half) */
- pl_fline_r (ch->lp,
- box_centre, bottom_whisker,
- box_centre, box_bottom);
+ cairo_move_to (cr, box_centre, bottom_whisker);
+ cairo_line_to (cr, box_centre, box_bottom);
+ cairo_stroke (cr);
/* (top half) */
- pl_fline_r (ch->lp,
- box_centre, top_whisker,
- box_centre, box_top);
+ cairo_move_to (cr, box_centre, top_whisker);
+ cairo_line_to (cr, box_centre, box_top);
+ cairo_stroke (cr);
outliers = box_whisker_outliers (bw);
for (ll = ll_head (outliers);
ll != ll_null (outliers); ll = ll_next (ll))
{
const struct outlier *outlier = ll_data (ll, struct outlier, ll);
- draw_case (ch, box_centre, outlier);
+ draw_case (cr, geom, box_centre, outlier);
}
/* Draw tick mark on x axis */
- draw_tick(ch, TICK_ABSCISSA, box_centre - ch->data_left, name);
-
- pl_restorestate_r(ch->lp);
+ draw_tick(cr, geom, TICK_ABSCISSA, box_centre - geom->data_left, "%s", name);
}
-void
-boxplot_draw_yscale (struct chart *ch, double y_max, double y_min)
+static void
+boxplot_draw_yscale (cairo_t *cr, struct chart_geometry *geom,
+ double y_max, double y_min)
{
double y_tick;
double d;
- if ( !ch )
- return ;
+ geom->y_max = y_max;
+ geom->y_min = y_min;
+
+ y_tick = chart_rounded_tick (fabs (geom->y_max - geom->y_min) / 5.0);
- ch->y_max = y_max;
- ch->y_min = y_min;
+ geom->y_min = (ceil (geom->y_min / y_tick) - 1.0) * y_tick;
- y_tick = chart_rounded_tick (fabs(ch->y_max - ch->y_min) / 5.0);
+ geom->y_max = (floor (geom->y_max / y_tick) + 1.0) * y_tick;
- ch->y_min = (ceil( ch->y_min / y_tick ) - 1.0 ) * y_tick;
+ geom->ordinate_scale = (fabs (geom->data_top - geom->data_bottom)
+ / fabs (geom->y_max - geom->y_min));
- ch->y_max = ( floor( ch->y_max / y_tick ) + 1.0 ) * y_tick;
+ for (d = geom->y_min; d <= geom->y_max; d += y_tick)
+ draw_tick (cr, geom, TICK_ORDINATE,
+ (d - geom->y_min) * geom->ordinate_scale, "%g", d);
+}
- ch->ordinate_scale = fabs(ch->data_top - ch->data_bottom)
- / fabs(ch->y_max - ch->y_min) ;
+static void
+boxplot_chart_draw (const struct chart *chart, cairo_t *cr,
+ struct chart_geometry *geom)
+{
+ const struct boxplot *boxplot = (struct boxplot *) chart;
+ double box_width;
+ size_t i;
- /* Move to data bottom-left */
- pl_move_r(ch->lp,
- ch->data_left, ch->data_bottom);
+ boxplot_draw_yscale (cr, geom, boxplot->y_max, boxplot->y_min);
+ chart_write_title (cr, geom, "%s", boxplot->title);
- for ( d = ch->y_min; d <= ch->y_max ; d += y_tick )
+ box_width = (geom->data_right - geom->data_left) / boxplot->n_boxes / 2.0;
+ for (i = 0; i < boxplot->n_boxes; i++)
{
- draw_tick (ch, TICK_ORDINATE, (d - ch->y_min ) * ch->ordinate_scale, "%g", d);
+ const struct box *box = &boxplot->boxes[i];
+ const double box_centre = (i * 2 + 1) * box_width + geom->data_left;
+ boxplot_draw_box (cr, geom, box_centre, box_width, box->bw, box->label);
}
}
+
+static void
+boxplot_chart_destroy (struct chart *chart)
+{
+ struct boxplot *boxplot = (struct boxplot *) chart;
+ size_t i;
+
+ free (boxplot->title);
+ for (i = 0; i < boxplot->n_boxes; i++)
+ {
+ struct box *box = &boxplot->boxes[i];
+ struct statistic *statistic = &box->bw->parent.parent;
+ statistic->destroy (statistic);
+ free (box->label);
+ }
+ free (boxplot->boxes);
+ free (boxplot);
+}
+
+static const struct chart_class boxplot_chart_class =
+ {
+ boxplot_chart_draw,
+ boxplot_chart_destroy
+ };
projects / pspp-builds.git / blobdiff