void addZone(double startValue, double endValue, int fillColor, int edgeColor = -1);

Adds an angular zone to the polar chart.

This method is just a short cut to AngularAxis.addZone, in which the starting radius is always 0, and ending radius is the radius of the polar plot region. In other words, the angular zone is a sector on the polar chart.

Argument	Default	Description
startValue	(Mandatory)	The data value that marks the start angular position of the zone.
endValue	(Mandatory)	The data value that marks the end angular position of the zone.
fillColor	(Mandatory)	The fill color of the zone.
edgeColor	-1	The edge color of the zone. The default is the same as the fill color.

None