Drawing a line

[Rayne Olivetti <rayneolivetti yahoo com>]

Hi,

I'm trying to draw a line to the screen with gtk+, but
it seems I'm doing something wrong :( Can someone
please help me? Thanks in advance,

Rayne

===========================


#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <assert.h>
#include <gtk/gtk.h>

#define GLADE_HOOKUP_OBJECT(component,widget,name) \
        g_object_set_data_full (G_OBJECT (component), name, \
        gtk_widget_ref (widget), (GDestroyNotify)
gtk_widget_unref)



#define BORDER_WIDTH 4

#define TITLE_MAIN_WIN PACKAGE VERSION



GtkWidget *main_window, *tileset_window,
*layer_window;
GtkWidget *status_bar, *vbox, *drawing_area;

GdkGC *gc;
GdkColormap *colormap;
GdkPixmap *test_pxm;



static gboolean quit_gtk(GtkWidget *widget, GdkEvent
*event, gpointer data)
{
        gtk_main_quit();
        return FALSE;
}
static GtkWidget * create_window(char *title, char
*ref_str)
{
        GtkWidget *window;
        assert( (window =
gtk_window_new(GTK_WINDOW_TOPLEVEL)) != NULL );
        gtk_window_set_title(GTK_WINDOW (window), title);
        gtk_container_set_border_width (GTK_CONTAINER
(window), BORDER_WIDTH);
        GLADE_HOOKUP_OBJECT (window, window, ref_str);
        return window;
}


int main(int argc, char *argv[])
{
        GdkColor cl;
        
        gtk_init (&argc, &argv);

        main_window = create_window(TITLE_MAIN_WIN,
"main_window");
        g_signal_connect(G_OBJECT (main_window),
"delete_event", G_CALLBACK (quit_gtk), NULL);
        gtk_widget_show(main_window);
        
        vbox = gtk_vbox_new(FALSE, 0);
        gtk_container_add (GTK_CONTAINER (main_window),
vbox);
        GLADE_HOOKUP_OBJECT (main_window, vbox, "vbox");
        gtk_widget_show(vbox);
        
        assert( (drawing_area = gtk_drawing_area_new()) !=
NULL );
        gtk_widget_show(drawing_area);
        gtk_box_pack_start(GTK_BOX (vbox), drawing_area,
TRUE, TRUE, 0);
        GLADE_HOOKUP_OBJECT (main_window, drawing_area,
"drawing_area");
        gtk_drawing_area_size( GTK_DRAWING_AREA( drawing_area
), 200, 200);
        gtk_widget_set_usize(drawing_area, 200, 200);

        
        assert( (gc = gdk_gc_new(drawing_area->window)) !=
NULL );
        colormap = gdk_colormap_get_system();
        assert( (gc = gdk_gc_new(drawing_area->window)) !=
NULL );
        
        gtk_widget_show(main_window);

        gdk_draw_rectangle(drawing_area->window,
drawing_area->style->black_gc, TRUE, 2, 3, 40, 45 );
        gtk_widget_queue_draw(drawing_area);
        
        gtk_main();
        
        return 0;
}


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