Pie: Legend Center
`%%{init: {"pie": {"legendPosition": "center"}}}%%` draws the legend over the middle of the pie, centred, without resizing the frame. The ASCII bar chart keeps its legend beside the bars, so it is unchanged.
pie-legend-center.mmd
%%{init: {"pie": {"legendPosition": "center"}}}%%
pie title Pets adopted by volunteers
"Dogs" : 386
"Cats" : 85
"Rats" : 15