Hi David,
We can achieve your requirement by overriding the item template’s “RenderTransform” of series. Following is the code snippet in which we have override the RenderTransform.
[XAML]:
Data="{Binding Geometry}" ToolTip="{Binding ToolTip}" RenderTransformOrigin="0.5,0.5">
Based on your requirement we have created a simple sample please download the sample from below location.
Sample:
http://www.syncfusion.com/uploads/redirect.aspx?&team=support&file=Pie_chart_90_degr-1591921549.zipPlease let us know if you need any further assistance.
Thanks,
Saravanan