+/* 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., 59 Temple Place - Suite 330, Boston, MA
+ 02111-1307, USA. */
+
+#include <config.h>
+#include <stdio.h>
+#include <plot.h>
+#include <stdarg.h>
+#include <string.h>
+#include <stdio.h>
+#include <float.h>
+#include <assert.h>
+#include <math.h>
+
+#include "chart.h"
+#include "str.h"
+
+
+const char *data_colour[] = {
+ "brown",
+ "red",
+ "orange",
+ "yellow",
+ "green",
+ "blue",
+ "violet",
+ "grey",
+ "pink"
+};
+
+
+
+int
+chart_initialise(struct chart *chart)
+{
+
+ chart->pl_params = pl_newplparams();
+
+ chart->lp = pl_newpl_r ("X",0,stdout,stderr,chart->pl_params);
+
+ if (pl_openpl_r (chart->lp) < 0) /* open Plotter */
+ return 1;
+
+ pl_fspace_r (chart->lp, 0.0, 0.0, 1000.0, 1000.0); /* set coordinate system */
+ pl_flinewidth_r (chart->lp, 0.25); /* set line thickness */
+ pl_pencolorname_r (chart->lp, "black");
+
+ pl_erase_r (chart->lp); /* erase graphics display */
+ pl_filltype_r(chart->lp,0);
+
+
+
+ pl_savestate_r(chart->lp);
+
+ /* Set default chartetry */
+ chart->data_top = 900;
+ chart->data_right = 800;
+ chart->data_bottom = 120;
+ chart->data_left = 150;
+ chart->abscissa_top = 70;
+ chart->ordinate_right = 120;
+ chart->title_bottom = 920;
+ chart->legend_left = 810;
+ chart->legend_right = 1000;
+ chart->font_size = 0;
+ strcpy(chart->fill_colour,"red");
+
+
+ /* Get default font size */
+ if ( !chart->font_size)
+ chart->font_size = pl_fontsize_r(chart->lp, -1);
+
+ /* Draw the data area */
+ pl_box_r(chart->lp,
+ chart->data_left, chart->data_bottom,
+ chart->data_right, chart->data_top);
+
+ return 0;
+
+}
+
+
+
+/* Draw a tick mark at position
+ If label is non zero, then print it at the tick mark
+*/
+void
+draw_tick(struct chart *chart,
+ enum tick_orientation orientation,
+ double position,
+ const char *label, ...)
+{
+ const int tickSize = 10;
+
+ pl_savestate_r(chart->lp);
+
+ pl_move_r(chart->lp, chart->data_left, chart->data_bottom);
+
+ if ( orientation == TICK_ABSCISSA )
+ pl_flinerel_r(chart->lp, position, 0, position, -tickSize);
+ else if (orientation == TICK_ORDINATE )
+ pl_flinerel_r(chart->lp, 0, position, -tickSize, position);
+ else
+ assert(0);
+
+ if ( label ) {
+ char buf[10];
+ va_list ap;
+ va_start(ap,label);
+ vsnprintf(buf,10,label,ap);
+
+ if ( orientation == TICK_ABSCISSA )
+ pl_alabel_r(chart->lp, 'c','t', buf);
+ else if (orientation == TICK_ORDINATE )
+ {
+ if ( fabs(position) < DBL_EPSILON )
+ pl_moverel_r(chart->lp, 0, 10);
+
+ pl_alabel_r(chart->lp, 'r','c', buf);
+ }
+
+ va_end(ap);
+ }
+
+ pl_restorestate_r(chart->lp);
+}
+
+
+
+
+/* Write the title on a chart*/
+void
+chart_write_title(struct chart *chart, const char *title, ...)
+{
+ va_list ap;
+ char buf[100];
+
+ pl_savestate_r(chart->lp);
+ pl_ffontsize_r(chart->lp,chart->font_size * 1.5);
+ pl_move_r(chart->lp,chart->data_left, chart->title_bottom);
+
+ va_start(ap,title);
+ vsnprintf(buf,100,title,ap);
+ pl_alabel_r(chart->lp,0,0,buf);
+ va_end(ap);
+
+ pl_restorestate_r(chart->lp);
+}
+
+
+
+void
+chart_finalise(struct chart *chart)
+{
+ pl_restorestate_r(chart->lp);
+
+ if (pl_closepl_r (chart->lp) < 0) /* close Plotter */
+ {
+ fprintf (stderr, "Couldn't close Plotter\n");
+ }
+
+
+ pl_deletepl_r(chart->lp);
+
+ pl_deleteplparams(chart->pl_params);
+
+}
+
+
+/* Set the scale for the abscissa */
+void
+chart_write_xscale(struct chart *ch, double min, double max, int ticks)
+{
+ double x;
+
+ const double tick_interval =
+ chart_rounded_tick( (max - min) / (double) ticks);
+
+ ch->x_max = ceil( max / tick_interval ) * tick_interval ;
+ ch->x_min = floor ( min / tick_interval ) * tick_interval ;
+
+ ch->abscissa_scale = fabs(ch->data_right - ch->data_left) /
+ fabs(ch->x_max - ch->x_min);
+
+ for(x = ch->x_min ; x <= ch->x_max; x += tick_interval )
+ {
+ draw_tick (ch, TICK_ABSCISSA,
+ (x - ch->x_min) * ch->abscissa_scale, "%g", x);
+ }
+
+}
+
+
+/* Set the scale for the ordinate */
+void
+chart_write_yscale(struct chart *ch, double smin, double smax, int ticks)
+{
+ double y;
+
+ const double tick_interval =
+ chart_rounded_tick( (smax - smin) / (double) ticks);
+
+ ch->y_max = ceil ( smax / tick_interval ) * tick_interval ;
+ ch->y_min = floor ( smin / tick_interval ) * tick_interval ;
+
+ ch->ordinate_scale =
+ fabs(ch->data_top - ch->data_bottom) / fabs(ch->y_max - ch->y_min) ;
+
+ for(y = ch->y_min ; y <= ch->y_max; y += tick_interval )
+ {
+ draw_tick (ch, TICK_ORDINATE,
+ (y - ch->y_min) * ch->ordinate_scale, "%g", y);
+ }
+
+}
+