private void OnDrawingarea1MotionNotifyEvent(object o, Gtk.MotionNotifyEventArgs args)
{
Cairo.PointD point = PintaCore.Workspace.WindowPointToCanvas (args.Event.X, args.Event.Y);
if (PintaCore.Workspace.PointInCanvas (point))
CursorPositionLabel.Text = string.Format ("{0}, {1}", (int)point.X, (int)point.Y);
PintaCore.Tools.CurrentTool.DoMouseMove (o, args, point);
}