How do I animate drawing a line in Javascript

I am trying to animate the drawing of a simple line from one point within an html element to another. The animation should be slightly slow (maybe taking like one second to reach the second point, but also customizable). I have been searching for the last couple of hours and have yet to find a single javascript library that does this for y开发者_Go百科ou. Anyone found or know of anything for this? Thanks,

Check out this javascript library. There are also some examples in there

Hope it helps