Pattern line along spline curve

Hello to all,

I have patterned lines along path curve (spline) and I would like to trim them by another curve (spline).

After that, I would like to translate all trimmed lines to an horizontal line which length will be equal to the length of earily used path (spline).

Before translation:

After translation:

What is the best way to do this?

Any help is very appreciated.

Danijel