+ ARDOUR::TempoMap::BBTPointList::const_iterator current_bbt_points_begin;
+ ARDOUR::TempoMap::BBTPointList::const_iterator current_bbt_points_end;
+
+ compute_current_bbt_points (leftmost_frame, leftmost_frame + current_page_samples(),
+ current_bbt_points_begin, current_bbt_points_end);
+ draw_measures (current_bbt_points_begin, current_bbt_points_end);
+ update_tempo_based_rulers (current_bbt_points_begin, current_bbt_points_end); // redraw rulers and measures
+