Specifies whether the line is a continuous curve or comprised of straight-line segments.

Smooth (the default) will calculate point tangents according the values of Tension, Bias and Continuity. These define the parameters for a Kochanek–Bartels spline calculation on the points.

Note that a Linear style should not define the control/tangent values for a CurvePoint. This is currently unsupported but might be supported in a later release.