+QString CursorPair::format_string()
+{
+ const unsigned int prefix = view_.tick_prefix();
+ const double delta = second_->time() - first_->time();
+ return QString("%1 / %2").
+ arg(util::format_time(delta, prefix, view_.time_unit(), 2)).
+ arg(util::format_si_value(1.0 / fabs(delta), "Hz", -1, 4));
+}
+
+void CursorPair::compute_text_size(QPainter &p)