Graph

Hello, I am hoping someone can answer, point me in which direction can I learn and work.

I am using Adobe Animate to animate such "graph" to "load" from A to B. (see attachment). What tool can i use to draw those bars gradually getting longer without distorsion or draw from scratch? If you look at the short lines, you can see a little bit weird distorsion and the lines don't follow the gray line.  

I can also use Illustrator, After effects.

I hope my question is clear.

Kind regards, Nejc