GridShape
public enum GridShape : String, Encodable
Determines if the radial axis grid lines and angular axis line are drawn as circular sectors or as linear (polygon) sectors.
Has an effect only when the angular axis has type category. Note that radialaxis.angle is
snapped to the angle of the closest vertex when gridshape is circular (so that radial axis
scale is the same as the data scale).
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GridShape Enumeration Reference