getMaxMinValue method
record.$1 : min value record.$2: max value
Implementation
@override
(double, double) getMaxMinValue(
KLineEntity entity, double minV, double maxV) {
if (entity.cci != null) {
minV = min(minV, entity.cci!);
maxV = max(maxV, entity.cci!);
}
return (minV, maxV);
}