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/* $Id: lissajous.c 4 2008-06-22 09:19:11Z rbock $ */
/* GtkDatabox - An extension to the gtk+ library
* Copyright (C) 1998 - 2008 Dr. Roland Bock
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* 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 Lesser 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 <stdio.h>
#include <gtk/gtk.h>
#include <gtkdatabox.h>
#include <gtkdatabox_points.h>
#include <gtkdatabox_lines.h>
#include <math.h>
#define POINTS 2000
/*----------------------------------------------------------------
* databox lissajous
*----------------------------------------------------------------*/
static gfloat *lissajousX = NULL;
static gfloat *lissajousY = NULL;
static gint lissajous_idle = 0;
static gfloat lissajous_frequency = 3. * G_PI / 2.;
static GtkWidget *lissajous_label = NULL;
static guint lissajous_counter = 0;
static gboolean
lissajous_idle_func (GtkDatabox * box)
{
gfloat freq;
gfloat off;
gchar label[10];
gint i;
if (!GTK_IS_DATABOX (box))
return FALSE;
lissajous_frequency += 0.001;
off = lissajous_counter * 4 * G_PI / POINTS;
freq = 14 + 10 * sin (lissajous_frequency);
for (i = 0; i < POINTS; i++)
{
lissajousX[i] = 100. * sin (i * 4 * G_PI / POINTS + off);
lissajousY[i] = 100. * cos (i * freq * G_PI / POINTS + off);
}
gtk_widget_queue_draw (GTK_WIDGET (box));
sprintf (label, "%d", lissajous_counter++);
gtk_entry_set_text (GTK_ENTRY (lissajous_label), label);
return TRUE;
}
static void
create_lissajous (void)
{
GtkWidget *window = NULL;
GtkWidget *box1;
GtkWidget *box2;
GtkWidget *close_button;
GtkWidget *box;
GtkWidget *label;
GtkWidget *table;
GtkWidget *separator;
GtkDataboxGraph *graph;
GdkColor color;
gint i;
lissajous_frequency = 0;
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_widget_set_size_request (window, 500, 500);
g_signal_connect (G_OBJECT (window), "destroy",
G_CALLBACK (gtk_main_quit), NULL);
gtk_window_set_title (GTK_WINDOW (window),
"GtkDatabox: Lissajous Example");
gtk_container_set_border_width (GTK_CONTAINER (window), 0);
box1 = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_container_add (GTK_CONTAINER (window), box1);
label =
gtk_label_new
("This example resembles an oszilloscope\nreceiving two signals, one is a sine (horizontal),\nthe other is a cosine with ever changing frequency (vertical).\nThe counter is synchron with the updates.");
gtk_box_pack_start (GTK_BOX (box1), label, FALSE, FALSE, 0);
separator = gtk_separator_new (GTK_ORIENTATION_HORIZONTAL);
gtk_box_pack_start (GTK_BOX (box1), separator, FALSE, FALSE, 0);
lissajous_label = gtk_entry_new ();
gtk_entry_set_text (GTK_ENTRY (lissajous_label), "0");
gtk_box_pack_start (GTK_BOX (box1), lissajous_label, FALSE, FALSE, 0);
separator = gtk_separator_new (GTK_ORIENTATION_HORIZONTAL);
gtk_box_pack_start (GTK_BOX (box1), separator, FALSE, FALSE, 0);
lissajous_idle = 0;
lissajous_frequency = 3. * G_PI / 2.;
lissajous_counter = 0;
/* Create a GtkDatabox widget along with scrollbars and rulers */
gtk_databox_create_box_with_scrollbars_and_rulers (&box, &table,
TRUE, TRUE, TRUE, TRUE);
gtk_box_pack_start (GTK_BOX (box1), table, TRUE, TRUE, 0);
color.red = 0;
color.green = 0;
color.blue = 32768;
gtk_widget_modify_bg (box, GTK_STATE_NORMAL, &color);
lissajousX = g_new0 (gfloat, POINTS);
lissajousY = g_new0 (gfloat, POINTS);
for (i = 0; i < POINTS; i++)
{
lissajousX[i] = 100. * sin (i * 4 * G_PI / POINTS);
lissajousY[i] = 100. * cos (i * 4 * G_PI / POINTS);
}
color.red = 65535;
color.green = 65535;
color.blue = 0;
graph = gtk_databox_lines_new (POINTS, lissajousX, lissajousY, &color, 1);
gtk_databox_graph_add (GTK_DATABOX (box), graph);
gtk_databox_auto_rescale (GTK_DATABOX (box), 0.05);
separator = gtk_separator_new (GTK_ORIENTATION_HORIZONTAL);
gtk_box_pack_start (GTK_BOX (box1), separator, FALSE, TRUE, 0);
box2 = gtk_box_new (GTK_ORIENTATION_VERTICAL, 10);
gtk_container_set_border_width (GTK_CONTAINER (box2), 10);
gtk_box_pack_end (GTK_BOX (box1), box2, FALSE, TRUE, 0);
close_button = gtk_button_new_with_label ("close");
g_signal_connect_swapped (G_OBJECT (close_button), "clicked",
G_CALLBACK (gtk_main_quit), G_OBJECT (box));
gtk_box_pack_start (GTK_BOX (box2), close_button, TRUE, TRUE, 0);
gtk_widget_set_can_default(close_button, TRUE);
gtk_widget_grab_default (close_button);
lissajous_idle = g_idle_add ((GSourceFunc) lissajous_idle_func, box);
gtk_widget_show_all (window);
}
gint
main (gint argc, char *argv[])
{
gtk_init (&argc, &argv);
create_lissajous ();
gtk_main ();
return 0;
}

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