getResponseAtLocation method
Charts need to implement this class to tell us what BaseTouchResponse is available at provided localPosition
When touch/pointer event happens, we send it to the user alongside the AFlTouchEvent using _touchCallback
Implementation
@override
PieTouchResponse getResponseAtLocation(Offset localPosition) {
final pieSection = painter.handleTouch(
localPosition,
mockTestSize ?? size,
paintHolder,
);
return PieTouchResponse(pieSection);
}