Add 'Cumulative Sum' type series
Given the amount of development geared towards highcharts as a financial charting library, it's a little surprising that there is no 'cumulative sum' series type.
The user can take the cumulative sum before a series is added... but as soon as the date range is changed, the series should re-calculate the cumulative sum. Implementing it requires wrapping/extending no less than 6 highcharts functions, and I'm sure I'll continue to come across more.
Started, you can follow the progress on our GitHub: https://github.com/highcharts/highcharts/issues/15361
Nicholas Laventis commented
Pawel, sorry for the late reply... This sort of works but would immediately break the navigator series, as well as other pieces of core functionality
Thanks for sharing the idea!
Perhaps it was never asked, because you can simply use `afterSetExtremes()` event, see: https://api.highcharts.com/highcharts/xAxis.events.afterSetExtremes - in this event you can call `mySeries.setData([ newDataSet ])`. Where `newDataSet` will include calculated cumulative sum just like when series is added.