On Fri, 25 Feb 2005 13:42:48 +0100
Carlo Agrusti <[EMAIL PROTECTED]> 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];
> _______________________________________________
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Gerald Emig
--
EMIG Software, Engelstr. 17, D-66564 Ottweiler, Germany
Tel.+49(0)6858-699567, Fax.699568, [EMAIL PROTECTED]
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