/** set1.c **/
#include <gnome.h>

gint eventDelete(GtkWidget *widget,
        GdkEvent *event,gpointer data);
gint eventDestroy(GtkWidget *widget,
        GdkEvent *event,gpointer data);
void eventChange(GtkWidget *widget,GtkWidget *button);

#define WIDTH 300
#define HEIGHT 200

int main(int argc,char *argv[])
{
    GtkWidget *app;
    GtkWidget *canvas;
    GtkWidget *button;
    GnomeCanvasGroup *rootGroup;
    GnomeCanvasItem *item;

    gnome_init("set1","1.0",argc,argv);
    app = gnome_app_new("Set 1",
            "Gnome Canvas Widget");
    gtk_signal_connect(GTK_OBJECT(app),"delete_event",
            GTK_SIGNAL_FUNC(eventDelete),NULL);
    gtk_signal_connect(GTK_OBJECT(app),"destroy",
            GTK_SIGNAL_FUNC(eventDestroy),NULL);

    canvas = gnome_canvas_new();
    gtk_widget_set_usize(canvas,WIDTH,HEIGHT);
    gnome_canvas_set_scroll_region(GNOME_CANVAS(canvas),
            0.0,0.0,WIDTH,HEIGHT);
    rootGroup = gnome_canvas_root(GNOME_CANVAS(canvas));
    gnome_app_set_contents(GNOME_APP(app),canvas);

    button = gtk_button_new_with_label("Change");
    gtk_signal_connect(GTK_OBJECT(button),"clicked",
            GTK_SIGNAL_FUNC(eventChange),button);
    item = gnome_canvas_item_new(rootGroup,
                    gnome_canvas_widget_get_type(),
                    "widget",button,
                    "x",(double)(5),
                    "y",(double)(5),
                    "anchor",GTK_ANCHOR_NW,
                    NULL);

    gtk_widget_show_all(app);
    gtk_main();
    exit(0);
}
void eventChange(GtkWidget *widget,GtkWidget *button)
{
    gint w;
    gint h;
    gint x;
    gint y;

    w = (gint)((random() % (WIDTH/2))+10);
    h = (gint)((random() % (HEIGHT/2))+10);
    gtk_widget_set_usize(GTK_WIDGET(button),w,h);

    x = (gint)((random() % (WIDTH/2))+25);
    y = (gint)((random() % (HEIGHT/2)))+25;
    gtk_widget_set_uposition(GTK_WIDGET(button),x,y);
}
gint eventDelete(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    return(FALSE);
}
gint eventDestroy(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    gtk_main_quit();
    return(0);
}