To generate pie chart set series type to “pie”.
Pie chart example:
<CHART width="800" height="400">
<SERIES>
<S type="pie" x="name" y="area">
</SERIES>
<SQL>
select first 10 * from (
select * from country order by area desc
)
</SQL>
</CHART>
Result:
Pie series may have an additional parameter donut - radius of the inner circle.
