Fill graph animation and boundary lines

[Winghin2517]

I see that when I animate a filled graph using line animator, it animates the graph from the starting point of the graph and android draws it in a "zig-zag" way - see the gif attached.

I would like it to almost reveal from left to right instead of this zig-zag animation. If the graph was not filled, the animation works correctly. How so does the animation not work correctly when the fill is on?

Also if you look at the base of the graph, you will see that there is a boundary line at the place where the fill stops. I have not set baseline on the graph so not sure why this is showing and I really want this to disappear. Is there any way to do it?