+
+ const framepos_t pos = e.pixel_to_sample(before_x);
+ const Meter& meter = map.meter_at (pos);
+ const framecnt_t len = ceil (meter.frames_per_bar (map.tempo_at (pos), e.session()->frame_rate())
+ / (Timecode::BBT_Time::ticks_per_beat * meter.divisions_per_bar()) );
+ const double one_tick_in_pixels = e.sample_to_pixel_unrounded (len);
+
+ before_x += one_tick_in_pixels;