If I understand correctly, you should be able to set the option
chart.interpolateNulls to true, and have it interpolate the points. Here's
an example: http://jsfiddle.net/BZQLS/

- Sergey


On Sat, Apr 19, 2014 at 1:32 AM, Matthew Claflin
<[email protected]>wrote:

> I am having the opposite problem....Is there a way to disable the line
> breaks in the plotted line?
>
> On Thursday, November 4, 2010 10:24:18 AM UTC-7, Jinji wrote:
>>
>> This is not supported, sorry. This 
>> issue<http://code.google.com/p/google-visualization-api-issues/issues/detail?id=25>was
>>  opened to track it.
>> This feature is available in the LineChart visualization, but not for
>> annotated time line.
>>
>> On Thu, Nov 4, 2010 at 2:36 AM, Philip <[email protected]>wrote:
>>
>>> I want to be able to have 'breaks' in the time series lines in the
>>> Annotated Time Line. Various postings indicated that this was
>>> possible, and that just specifying null in a cell would have the
>>> effect of breaking the line. However a quick experiment with the
>>> interactive tool reveals that the Annotated Time Line just draws the
>>> line from the preceding value to the following value.
>>>
>>> For example, the chart at http://pond1.gladstonefamily.net/KBOS.gif
>>> shows what I would like to do. The red line has a break in it --
>>> indicating that there was no data at that time. It is important to
>>> distinguish that from interpolated values. [That chart is server
>>> rendered with gnuplot. I'd like to move to client side rendering with
>>> interactivity]
>>>
>>> If somebody has seen an example of missing data that displays
>>> properly, then please explain how it was done, or post the URL of the
>>> page so that I can take a look.
>>>
>>> Yes, I know that dygraphs can do this but I prefer the navigation of
>>> the google chart -- especially having the option to fetch more data as
>>> the user interacts with the chart.
>>>
>>> Thanks
>>>
>>> Philip
>>>
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