Re: rubberbanding with GTK1* and GTK2*

[Gerald Emig <gme epr80 de>]

On Fri, 25 Feb 2005 13:42:48 +0100
Carlo Agrusti <carlo-ag libero it> wrote:

> kees ha scritto lo scorso 25/02/2005 12:45:
> > Can anyone explain to me why the very small program beneath,
> > demonstrating a very basic form of rubberbanding, works excellent
> > while compiled with GTK1* but does not work correctly when compiled
> > with GTK2*.
> [..]
> >  gint drawareacb(GtkWidget *widget, GdkEventButton *event, gpointer
> >  data)
> >   {
> >   gint  x0, y0;
> >   gint x[2], y[2];
> >   if(ii == 0)
> >    {
> >    cleararea(drawing_area);
> >    ii=1;
> >    }
> >   gdk_window_get_pointer(drawing_area->window, &x0, &y0, NULL);
> >   switch(event->type)
> >   {
> >   case GDK_BUTTON_PRESS:
> >   x[0]=x0;
> >   y[0]=y0;
> >   gdk_draw_line(drawing_area->window, gc, 200, 400, x0, y0);
> >   break;
> >   case GDK_MOTION_NOTIFY:
> >   x[1]=x0;
> >   y[1]=y0;
> >   gdk_draw_line(drawing_area->window, gc, 200, 400, x[0], y[0]);
>                                                        ^^^^^^^^^^
> gdb gives:
> x[0] = 1048
> y[0] = -1073751042

That is the point: x[0], y[0] are probably uninitialized here...


> >   gdk_draw_line(drawing_area->window, gc, 200, 400, x[1], y[1]);
> >   x[0]=x[1];
> >   y[0]=y[1];
> _______________________________________________
> gtk-app-devel-list mailing list
> gtk-app-devel-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list



Gerald Emig

--
EMIG Software, Engelstr. 17, D-66564 Ottweiler, Germany
Tel.+49(0)6858-699567, Fax.699568, gme emig-software de