--- /dev/null
+/* PSPP - computes sample statistics.
+ Copyright (C) 2004 Free Software Foundation, Inc.
+ Written by John Darrington <john@darrington.wattle.id.au>
+
+ 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 the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301, USA. */
+
+
+#include "chart.h"
+#include "chart-geometry.h"
+#include <math.h>
+#include <assert.h>
+#include "misc.h"
+
+#include "factor-stats.h"
+#include "box-whisker.h"
+#include "plot-chart.h"
+
+
+/* Draw a box-and-whiskers plot
+*/
+
+/* Draw an outlier on the plot CH
+ * at CENTRELINE
+ * The outlier is in (*wvp)[idx]
+ * If EXTREME is non zero, then consider it to be an extreme
+ * value
+ */
+void
+draw_outlier(struct chart *ch, double centreline,
+ struct weighted_value **wvp,
+ int idx,
+ short extreme);
+
+
+void
+draw_outlier(struct chart *ch, double centreline,
+ struct weighted_value **wvp,
+ int idx,
+ short extreme
+ )
+{
+ char label[10];
+
+#define MARKER_CIRCLE 4
+#define MARKER_STAR 3
+
+ pl_fmarker_r(ch->lp,
+ centreline,
+ ch->data_bottom +
+ (wvp[idx]->v.f - ch->y_min ) * ch->ordinate_scale,
+ extreme?MARKER_STAR:MARKER_CIRCLE,
+ 20);
+
+ pl_moverel_r(ch->lp, 10,0);
+
+ snprintf(label, 10, "%d", wvp[idx]->case_nos->num);
+
+ pl_alabel_r(ch->lp, 'l', 'c', label);
+
+}
+
+
+void
+boxplot_draw_boxplot(struct chart *ch,
+ double box_centre,
+ double box_width,
+ struct metrics *m,
+ const char *name)
+{
+ double whisker[2];
+ int i;
+
+ const double *hinge = m->hinge;
+ struct weighted_value **wvp = m->wvp;
+ const int n_data = m->n_data;
+
+ const double step = (hinge[2] - hinge[0]) * 1.5;
+
+
+ const double box_left = box_centre - box_width / 2.0;
+
+ const double box_right = box_centre + box_width / 2.0;
+
+
+ const double box_bottom =
+ ch->data_bottom + ( hinge[0] - ch->y_min ) * ch->ordinate_scale;
+
+
+ const double box_top =
+ ch->data_bottom + ( hinge[2] - ch->y_min ) * ch->ordinate_scale;
+
+ assert(m);
+
+ /* Can't really draw a boxplot if there's no data */
+ if ( n_data == 0 )
+ return ;
+
+ whisker[1] = hinge[2];
+ whisker[0] = wvp[0]->v.f;
+
+ for ( i = 0 ; i < n_data ; ++i )
+ {
+ if ( hinge[2] + step > wvp[i]->v.f)
+ whisker[1] = wvp[i]->v.f;
+
+ if ( hinge[0] - step > wvp[i]->v.f)
+ whisker[0] = wvp[i]->v.f;
+
+ }
+
+ {
+ const double bottom_whisker =
+ ch->data_bottom + ( whisker[0] - ch->y_min ) * ch->ordinate_scale;
+
+ const double top_whisker =
+ ch->data_bottom + ( whisker[1] - ch->y_min ) * ch->ordinate_scale;
+
+
+ pl_savestate_r(ch->lp);
+
+
+ /* 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);
+
+
+
+ /* 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);
+
+
+ /* Draw the bottom whisker */
+ pl_fline_r(ch->lp,
+ box_left,
+ bottom_whisker,
+ box_right,
+ bottom_whisker);
+
+ /* Draw top whisker */
+ pl_fline_r(ch->lp,
+ box_left,
+ top_whisker,
+ box_right,
+ top_whisker);
+
+
+
+ /* Draw centre line.
+ (bottom half) */
+ pl_fline_r(ch->lp,
+ box_centre, bottom_whisker,
+ box_centre, box_bottom);
+
+ /* (top half) */
+ pl_fline_r(ch->lp,
+ box_centre, top_whisker,
+ box_centre, box_top);
+ }
+
+ /* Draw outliers */
+ for ( i = 0 ; i < n_data ; ++i )
+ {
+ if ( wvp[i]->v.f >= hinge[2] + step )
+ draw_outlier(ch, box_centre, wvp, i,
+ ( wvp[i]->v.f > hinge[2] + 2 * step )
+ );
+
+ if ( wvp[i]->v.f <= hinge[0] - step )
+ draw_outlier(ch, box_centre, wvp, i,
+ ( wvp[i]->v.f < hinge[0] - 2 * step )
+ );
+ }
+
+
+ /* Draw tick mark on x axis */
+ draw_tick(ch, TICK_ABSCISSA, box_centre - ch->data_left, name);
+
+ pl_restorestate_r(ch->lp);
+
+}
+
+
+
+void
+boxplot_draw_yscale(struct chart *ch , double y_max, double y_min)
+{
+ double y_tick;
+ double d;
+
+ if ( !ch )
+ return ;
+
+ ch->y_max = y_max;
+ ch->y_min = y_min;
+
+ y_tick = chart_rounded_tick(fabs(ch->y_max - ch->y_min) / 5.0);
+
+ ch->y_min = (ceil( ch->y_min / y_tick ) - 1.0 ) * y_tick;
+
+ ch->y_max = ( floor( ch->y_max / y_tick ) + 1.0 ) * y_tick;
+
+ ch->ordinate_scale = fabs(ch->data_top - ch->data_bottom)
+ / fabs(ch->y_max - ch->y_min) ;
+
+
+ /* Move to data bottom-left */
+ pl_move_r(ch->lp,
+ ch->data_left, ch->data_bottom);
+
+ for ( d = ch->y_min; d <= ch->y_max ; d += y_tick )
+ {
+ draw_tick (ch, TICK_ORDINATE, (d - ch->y_min ) * ch->ordinate_scale, "%g", d);
+ }
+
+}
projects / pspp-builds.git / blobdiff