How to start the animation only when the circle appears in browser's view (on scrolling)?

How can i animate circle while scrolling down to page ? My page is quite long and this plugin come just above the footer, but it animate, when page loads and when scroll down, can not see the circle progress effect ?

No files, tests, or entry points are mentioned. Start by locating the circle animation and any scroll-related usage or examples; done means the animation begins when the circle enters the browser view instead of on page load, with that behavior documented or tested.

Written by the indexing model from the issue text.