Doughnut chart animation

Hello, 

I'm trying to animate a doughnut chart, in a way similar to these examples: 

http://canvasjs.com/html5-javascript-doughnut-chart/

It's the most common way of animating a doughnut chart.

Using ChartRotateAnimation didn't produce the expected result. I couldn't find any examples of this control, and the documentation doesn't explain what the methods do. 

Can you help?