createTickFormatter method
A formatter will be created with the DateFormat
if it is not null.
Otherwise, it will create one with the provided
DateTimeFormatterFunction
.
Implementation
@override
DateTimeTickFormatter createTickFormatter(ChartContext context) {
assert(dateFormat != null || formatter != null);
return DateTimeTickFormatter.uniform(SimpleTimeTickFormatter(
formatter: dateFormat != null ? dateFormat!.format : formatter!));
}