Pie 2D

1: Pie with internal labels.

2: Pie with external labels and precision=0.

3: Pie with `labelStyle="columns"`, a constant radius, and a `0` plot value.

4/5: Two pies with internal and external labels with a constant radius.

6/7: Pie with internal custom labels and custom colors (#7 is rotated).

8: Degenerated pie with 1 element.

9: Degenerated pie with 1 positive elements (out of 5).

10: Pie with no data.

11: Pie with all data zero (no data).

12: Pie with all data zero (no data) and a message.

That's all Folks!