Evaluate a control node array at a given chart distance x. Control nodes are sorted by descending x and interpolated with their easing.
The control array (sorted descending by x).
Chart distance from the line.
The property name to read from control nodes (e.g. 'alpha', 'pos').
The interpolated control value.
Evaluate a control node array at a given chart distance x. Control nodes are sorted by descending x and interpolated with their easing.