/** boxbox.c (Gnome) **/
#include <gnome.h>

gint eventDelete(GtkWidget *widget,
        GdkEvent *event,gpointer data);
gint eventDestroy(GtkWidget *widget,
        GdkEvent *event,gpointer data);
gboolean eventExpose(GtkWidget *widget,
        GdkEvent *event,gpointer data);
gint eventConfigure(GtkWidget *widget,
        GdkEventConfigure *event,gpointer data);

#define STEP 3

static char name[] = "BoxBox";
static int xBox1;
static int yBox1;
static int xBox2;
static int yBox2;

int main(int argc,char *argv[])
{
    GtkWidget *app;
    GtkWidget *area;

    gnome_init(name,"1.0",argc,argv);
    app = gnome_app_new(name,"Boxes in Boxes");
    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);

    area = gtk_drawing_area_new();
    gnome_app_set_contents(GNOME_APP(app),area);

    gtk_signal_connect(GTK_OBJECT(area),"expose_event",
            GTK_SIGNAL_FUNC(eventExpose),NULL);
    gtk_signal_connect(GTK_OBJECT(area),"configure_event",
            GTK_SIGNAL_FUNC(eventConfigure),NULL);

    gtk_widget_show_all(app);
    gtk_main();
    exit(0);
}
gboolean eventExpose(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    int x1;
    int y1;
    int x2;
    int y2;

    x1 = xBox1;
    y1 = yBox1;
    x2 = xBox2;
    y2 = yBox2;
    while((x1 < x2) && (y1 < y2)) {
        gdk_draw_line(widget->window,
                widget->style->black_gc,
                x1,y1,x2,y1);
        gdk_draw_line(widget->window,
                widget->style->black_gc,
                x2,y1,x2,y2);
        gdk_draw_line(widget->window,
                widget->style->black_gc,
                x2,y2,x1,y2);
        gdk_draw_line(widget->window,
                widget->style->black_gc,
                x1,y2,x1,y1);
        x1 += STEP;
        y1 += STEP;
        x2 -= STEP;
        y2 -= STEP;
    }
    return(TRUE);
}
gint eventConfigure(GtkWidget *widget,
        GdkEventConfigure *event,gpointer data)
{
    xBox1 = 10;
    yBox1 = 10;
    xBox2 = event->width - 10;
    yBox2 = event->height - 10;
    return(TRUE);
}
gint eventDelete(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    return(FALSE);
}
gint eventDestroy(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    gtk_main_quit();
    return(0);
}