Add isStacked to Annotated Time Line

[orwant]

What would you like to see us add to this API?
The Area Chart vis. has an isStacked parameter that accumulates the values.  I'd like
to see that 
on Annotated Time Line.  I want the interaction provided by Annotated Time Line, but
this 
feature from Area Chart.


What component is this issue related to (PieChart, LineChart, DataTable,
Query, etc)?
Annotated Time Line


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Original issue reported on code.google.com by unowhatimsizayin on 2009-09-03 17:15:49

[orwant]

I'd like to see this feature, but I think the description needs more details about
how this should be implemented. Because the x-axis is a timeline, not discrete
values, different data series may often not have values at the same dates. Perhaps
the solution should use linear interpolation to estimate these values, or offer an
additional parameter to select the interpolation scheme.

Original issue reported on code.google.com by bryanpon on 2009-10-08 21:16:58