animation attribute keySplines
The cy of a blue stroked circle is animated with six different values
animations using calcMode spline and keySplines.
The cx is animated linear with values animations to get
two dimensional trajectories.
The resulting trajectories are displayed within the active duration
as gray paths. These paths cover always completely the red fill
of the circle.
If the red center of the circle gets visible, an error is
occured.
The timing of the cx animations is choosen in such
a way, that the keySplines correspond directly to a cubic
path as trajectory. The keySplines values have to be multiplied
only with the related values, to get the path data.
Blue test circle - if the red center is not exactly below a gray path, this is an error
Gray paths indicating the trajectory of the center of the circle