The next element represents the next point in the arc's path.
Between the start and the end of the path, there can be any number
(even zero) of next elements (intermediate points). They are read
consecutively: start, next, next, ..., next, end.
When the path from the previous point to this point is not straight,
this element also contains a list of control points
(between 1 and 2) describing a Bezier curve (quadratic if 1 control
point, cubic if 2) between the previous point and this point.
List of control points, used when the path describes a
curve.
The number of points describes the degree of the Bezier
curve: linear (0), quadratic (1) or cubic (2)