nice method
Returns nicely rounded domain values.
Implementation
TimeScale nice([int count = 10]) {
final span = _domain.last.difference(_domain.first);
final interval = _selectInterval(span, count);
_domain[0] = _floorToInterval(_domain[0], interval);
_domain[_domain.length - 1] = _ceilToInterval(_domain.last, interval);
return this;
}