#include <stdlib.h>
#include <math.h>
#include <glib.h>
#include <gtk/gtk.h>
#include "gtk_pie_chart.h"
 
 
gboolean rotate_chart_tcb( GtkPieChart *pie ) {
  static unsigned long count = 0;
  double angle;
 
  angle = (M_PI*2.0/100.0)*(count%100) - M_PI;
  g_object_set( pie, "start_angle", angle, NULL );
 
  count++;
 
  gtk_widget_queue_draw( (GtkWidget *)pie );
 
  return( TRUE );
}
 
 
void quit () {
  gtk_exit( 0 );
}
 
 
int main( int argc, char *argv[] ) {
  GtkWidget *win, *vbox, *pie;
  float rgba[4] = { 1.0, 1.0, 0.5, 1.0 };
 
  gtk_init( &argc, &argv );
 
  win = gtk_window_new( GTK_WINDOW_TOPLEVEL );
  gtk_widget_set_name( win, "Pie Chart Test" );
 
  vbox = gtk_vbox_new( FALSE, 0 );
  gtk_container_add( GTK_CONTAINER(win), vbox );
  gtk_widget_show( vbox );
 
  gtk_signal_connect( GTK_OBJECT(win), "destroy", GTK_SIGNAL_FUNC(quit), NULL );
 
  // Create the drawing area
  pie = gtk_pie_chart_new();
  gtk_pie_chart_add_segment( GTK_PIE_CHART(pie), 0.5, "First", rgba );
  rgba[0] = 0.5;
  gtk_pie_chart_add_segment( GTK_PIE_CHART(pie), 0.25, "Second", rgba );
  rgba[1] = 0.5;
  rgba[2] = 1.0;
  gtk_pie_chart_add_segment( GTK_PIE_CHART(pie), 0.25, "Third", rgba );
 
  gtk_box_pack_start( GTK_BOX(vbox), pie, TRUE, TRUE, 0 );
 
  gtk_widget_show( pie );
 
  gtk_widget_show_all( win );
 
  g_timeout_add( 100, (GSourceFunc)rotate_chart_tcb, pie );
 
  gtk_main();
 
  exit( 0 );
}