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Edit Polygon Series points in igDataChart


I show two types of scatter series in my chart:  Scatter Line and Scatter Polygon. Now I would like to edit the series points. Using 'SetItem' ( method I can update a point belongs to a Scatter Line series giving the new point, its index in datasource and the name of the series.

How to update a point in a Scatter Polygon series? the data is two dimensional. Please use the given Ignite UI Polygon Sample ( as an example. 

With best regards.