hierarchy chart on vf page by using google chart.

Hi Guys,

I am writing this post to show how we can create a beautiful chart showing hierarchy level for Account on detail page, 

all Contacts shows according to their reporting managers for an Account.

here I am using Google chart in VF page and apex class,

for this requirement i am creating a string "ContactData" and using it on VF page that's it.

following is code for extension class and vf page:-

Screen shoot:-

Note:- chart is shows only if you fill the "Reports To" field at contact level.
Happy coding...
Thanks
Anurag Jain.