Item trees

I'm sure I've just missed it, but I can't find anything anywhere that shows the item build trees. I'm trying to figure out what builds into what and doing the math to decide what's cost effective at certain points, but to do that, a tree (similar to what they have in the game) would be incredibly useful.
Anyone has a link to something like this? I'd greatly appreciate it!

Guess I should take that as a no? I just have to roam around the item page and go through each item to find out what builds into what. Sure, that's not tedious and I'm sure it's very user friendly. What's that? I've looked over the item page? And it doesn't even tell you under each item what is required to build it? You just have to guess based off of the small pictures and then find one that looks like it MIGHT be it? That's so very helpful!

... You know, if no one knew of anything, a simple no would've sufficed as well...

Maybe try dota2wiki?

That's better than anything else I've found. At least it gives me the name and price and a link to the actual item. Thanks.
I might have to make up the kind of chart I'm thinking of myself sometime and if I do, I'll share it for everyone. Maybe I'm just not explaining very well what I was hoping to find!