#include <gtk/gtk.h>

koch_sala_elementas(cairo_t* cr, double stx, double sty, int n)
{
	if (n > 0)
	{
		n--;
		stx = stx/ 4;
		sty = sty/ 4;
		koch_sala_elementas(cr, stx, sty, n);
		koch_sala_elementas(cr, sty, -stx, n);
		koch_sala_elementas(cr, stx, sty, n);
		koch_sala_elementas(cr, -2*sty, 2*stx, n);
		koch_sala_elementas(cr, stx, sty, n);
		koch_sala_elementas(cr, sty, -stx, n);
		koch_sala_elementas(cr, stx, sty, n);
	}
	else
	{
		cairo_rel_line_to(cr, stx, sty);
		cairo_rel_line_to(cr, sty, -stx);
		cairo_rel_line_to(cr, stx, sty);
		cairo_rel_line_to(cr, -2*sty, 2*stx);
		cairo_rel_line_to(cr, stx, sty);
		cairo_rel_line_to(cr, sty, -stx);
		cairo_rel_line_to(cr, stx, sty);
	}
	
}

koch_sala(cairo_t* cr, int n)
{
	cairo_move_to(cr, 0.2, 0.2);
	koch_sala_elementas(cr, 0.1, 0, n);
	koch_sala_elementas(cr, 0, 0.1, n);
	koch_sala_elementas(cr, -0.1, 0, n);
	koch_sala_elementas(cr, 0, -0.1, n);
	cairo_close_path(cr);
	cairo_fill(cr);
}

expose(GtkWidget *widget, GdkEventExpose *event, gpointer data)
{
	cairo_t* cr = gdk_cairo_create(widget-> window);
	
	cairo_scale(cr, widget->allocation.width, widget->allocation.height);
	cairo_set_line_width (cr, 0.02);
	koch_sala(cr, 4);
	
	cairo_show_page(cr);
	
	cairo_destroy(cr);
	return TRUE;
}

int main (int argc, char **argv)
{
	gtk_init(&argc, &argv);
	
	GtkWidget *win = gtk_window_new(GTK_WINDOW_TOPLEVEL);
	g_signal_connect(win, "delete_event", gtk_main_quit, NULL);
	
	GtkWidget* area = gtk_drawing_area_new(); 
	gtk_widget_set_size_request (area, 200, 200);
	g_signal_connect(G_OBJECT(area), "expose_event", G_CALLBACK(expose), NULL);
	
	gtk_container_add(GTK_CONTAINER(win), area);
	
	gtk_widget_show_all(win);
	
	gtk_main();
	return 0;
}