how to create version one burned down chart using java REST client api - api

I am trying to get the data to create the burned down chart from version one.
I came to know there is no standard api's for that.
Here i found that by making multiple call's to fetch todo value for a scope of timebox it is possible.
Is there any better way to do it?
and also let me know any good open source libraries(javascrpt/java) to plot such graph
i tried the way shown here but i am not able to make out what value i am getting.
i tried a get request like
"base URL"/rest-1.v1/Data/Timebox?where=State.Code='ACTV'&asof"11-25-2015"&sel=Name,EndDate,State,Workitems.ToDo.#Sum
but could only get present value but not the past ones.
Thanks in advance

You are using the rest-1.v1/Data endpoint. From this endpoint you will get the current state of assets in your VersionOne instance however, there is an attribute "Prior" which contains the previous state of a VersionOne asset (Timebox). The most robust way to access historical data is though the rest-1.v1/Hist endpoint. You can find details about Hist queries here.
Using your query
"base URL"/rest-1.v1/Hist/Timebox?where=State.Code='ACTV'&asof"2015-11-25T17:30:00.00"&sel=Name,EndDate,State,Workitems.ToDo.#Sum
The asof keyword will return the state of that Timebox at that instance in time. Observe the proper format of the date.

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I'm trying to aggregate some information about the kanban states of my user stories. If query a PifTeam item, I get a summarized collection of UserStories associated with it.
Example query:
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I'm trying to pull from the API of story counts for the latest release, broken down by schedule state. There's a report that does that currently, but I don't see any exposed method in the API. Does anyone know if that's possible to obtain?
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https://rally1.rallydev.com/slm/webservice/1.31/hierarchicalrequirement.js?query=(ScheduleState = "In-Progress")
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http://developer.rallydev.com
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https://rally1.rallydev.com/slm/doc/webservice/batch.jsp#example8