Pie charts

Use a pie chart to show the share of a whole: a few categories sized by their proportion of a total.

pie showData title Pets adopted by volunteers
  "Dogs" : 386
  "Cats" : 85
  "Rats" : 15

The first keyword is pie. An optional showData, before or after title, appends each slice’s raw value to its legend entry. The title may sit on the pie line (as above) or on its own line.

Each remaining line is a slice: "Label" : value (the quotes are optional). Values are numbers. A slice with a non-numeric or negative value is skipped, so a chart always renders. Slice angles and colors are computed automatically.