Features Suggestion

I was using chartjs at work today and I noticed this in the documentation. It appears to be a mix between a pie chart and a radar chart. Note that there is only one dimension being plotted, everything else is a function of the radius. On further research, they are also called Coxcomb or Rose charts.

If implemented this should probably borrow as much of their API as possible from either pie or radar charts so that users can switch between them quickly in testing. Perhaps this should even be a subclass of one of them.

I also wonder if this would benefit from layering multiple datasets on top of each other (like is done with Radar charts). There is a famous historical example of this here:

Code example: If applicable, use this space to demonstrate how you wish the new feature could be used in code.

double[] values = { 778, 283, 184, 76, 43 };
plt.AddPolarArea(values);