A demo of the Degrafa AdvancedCubicBezier y at x method is now available. This method returns up to three t-parameters of the cubic curve’s y-coordinate at the input x-coordinate. This allows the caller to choose among multiple y-values with the same x-coordinate.
The Algorithmist 
I was playing around with it, very nice.
I did discover some situations where no points are found on certain segments even though the red line visibly crossed the curve. Mostly this involved making a loop and putting one end coordinate weird below one end of the curve and selecting just the loop.. impossible to explain, so i did a pic here: http://www.constructoid.com/stuff/comments/algorithmistCurve.jpg
I noticed it had something to do with the t: parameter approaching 1 (it didn’t work when crossing the boundary of D’s point in the pic).
Monkey tested :p
Thanks – I’ll look into it.
– jim
Should be fixed now; a small typo in the inline bisection resulting from the port from Singularity to Degrafa. Thanks again!!
– jim
Cool, i contributed something.. glad to be of assistance :p