How I Made That: Animated Square Pie Chart

Also known as waffle charts. Using animated transitions between values, you can allow for comparisons between categories.

The How I Made That series describes the process behind a graphic and includes code and data to work with.

I’m a fan of element-based visualization methods, because they tend to shorten the path from abstract data back to reality. So when I wanted to compare percentages across various demographics, I went with the square pie chart instead of stacked bars or standard pie charts.

I’ve made these in R, but this was the first time I made them using d3.js. I wanted animated transitions when you switched between different groups of people. Here’s how I made it.

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About the Author

Nathan Yau is a statistician who works primarily with visualization. He earned his PhD in statistics from UCLA, is the author of two best-selling books — Data Points and Visualize This — and runs FlowingData. Introvert. Likes food. Likes beer.