Pie Layout

In order to draw our pie chart, we need to convert our data into a pie friendly format. We can do this using a pie layout.

let pie = d3.layout.pie();

pie(data);

This will convert our data into an array of objects containing start angles and end angles.

Exercise - create a simple pie chart

Assume a simple array of data like this:

data = [1, 2, 3];

Create a pie chart based on this data.

Experiment with converting this into a ring chart.

Exercise - create a simple pie chart from an array of objects

Assume an array of data like this:

data = [
  { name: "cats", quantity: 12 },
  { name: "mice", quantity: 19 },
  { name: "rice", quantity: 88 },
];

Use a pie layout to create a simple pie chart to display that data.

Optionally AJAX in your own data feed.