There is no option to remove the "shadow" of the highlighted slice, but 
with a little digging into the SVG/VML structure of the charts, you can 
remove them: http://jsfiddle.net/asgallant/Hx4Vd/

Note that this solution depends on the *current* implementation of the API, 
and is not guaranteed to work in future revisions.  If the team changes the 
organization of the SVG/VML code, this will need to be updated to match.

On Wednesday, September 26, 2012 4:31:35 AM UTC-4, Raimond Tunnel wrote:
>
> Hi
>
> How to remove the shadow that appears under the slice of a PieChart when 
> hovering? 
> I could not find any information about that from the API.
>
> https://developers.google.com/chart/interactive/docs/gallery/piechart?hl=zh-CN
>
> When hovering a slice I want the tooltip to show, but not the shadow.
>
> Also there's a typo in your API: 
>
> slices: [{color: 'black', {}, {}, {color: 'red'}]
>
>
> There's a missing } from the first element.
>

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