These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Data grouping is the concept of sampling the data values into larger
blocks in order to ease readability and increase performance of the
the points become closer than a certain pixel value, determined by
If data grouping is applied, the grouping information of grouped
points can be read from the Point.dataGroup. If point options other than
the data itself are set, for example
color or custom properties,
the grouping logic doesn't know how to group it. In this case the options of
the first point instance are copied over to the group point. This can be
altered through a custom
approximation callback function.