I know this post is over a year old but I did this to change my legend 
rectangles to circles (please excuse my jQuery):


    $google_chart.find('svg g:first-of-type g rect:last-of-type 
').attr('rx':30, 
'ry':30)


On Thursday, October 11, 2012 7:11:35 AM UTC-7, Martin Treml wrote:
>
> Hi!
>
> I'm just started to use the google visualization API and after a time of 
> learning i got stuck in styling my legend and tooltips.
>
> I'm using an AreaChart with focusTarget on category.
> Maybe someone could help me with my problems.
>
> *Legend:*
>
> is it possible to change the rectangles to circles
>
> is it possible to change the text color to the same as the indicator 
> (rectangle)
>
>
> *Tooltips:* 
>
> is it possible to display only the value aside an point, and not all in 
> one box, similar to this one 
> http://www.amcharts.com/javascript/line-chart-with-multiple-value-axes/
>
> is it possible to display a line who overlaps in the middle of each point 
> in the whole height of the chart
>
>  
>  
> best regards,
> Treml Martin
>

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