snap to the curve created by the curvy splines segment points

[ShiroeYamamoto]

Hi everybody,

is there a way to get the white curve created by the spline segments? I mean if it's a straight line, I can calculate the specific location of the points on that line, but in this case I want to find the points on this curve. I want to make a function that when I bring a point too close to this white curve, that point will snap to the position of the white curve.

I'm not good at English so I use google translate. Hope everyone understands what I mean.

Thanks everyone.