Possible Values

Axial

Position based on the X/Y values in a rectangular layout

Radial

For a pie chart, positioned at the center of edge wedge (on the edge of the circle). This is based on the weight and accumulated weight of each segment.

Angular

For a spider chart, the point is placed around the circle based on the relativeX value. The distance away from center on the Y value.

AngularFull

Like Angular, except always positiong at the edge of the circle.