The PolarChart UI component comes with API members that allow you to select a series in code. To set a custom 'selected' style for all series at once, use the selectionStyle object within the commonSeriesSettings configuration object.
If you have several series of one type, you can set selection style properties to the values specific to this type using the corresponding object (area, line or another) within the commonSeriesSettings configuration object. The values that are set within series-type-specific configuration objects override the corresponding common values.
In case you have to set a selection style property for an individual series, use the selectionStyle object within the series object of the series array. The values that are set individually override corresponding common values.
The following dash styles are available:
The border is a solid, continuous line.
The border is displayed using long dashes.
The border is displayed using dashes.
The border is displayed using dots.
Any combination of 'longDash', 'dash' and 'dot'
The border is displayed by repeating the specified combination. For instance, 'dashdotdash'.