Applying corner radius to square form legends

I've referred to this [issue](https://github.com/danielgindi/Charts/issues/710) which talks about subclassing a Chart View and passing on to it customized legend renderers in the initialize method.

I looked into it a bit, however completely baffled where to start changing the code for replicating the behavior I want.

Currently I'm using a PieChartView and Square form legends. However I want apply a 2-3 float corner radius value to the square legends.

Can you please help me with this, how to go about it.

Start by reading issue 710 and tracing how a PieChartView uses square form legends and customized legend renderers passed during initialization. Confirm where the legend renderer can control the square form, then define completion as rendering those legends with a configurable 2–3 point corner radius.

Written by the indexing model from the issue text.