How to Make an Interactive Treemap
Treemaps are useful to view and explore hierarchical data. Interaction can help you look at the data in greater detail.
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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.
How to Make an Interactive Bar Chart With a Slider
Provide a slider for the standard bar chart so that users can shift focus to a point of interest.
Small Maps and Grids
Maybe you want to make spatial comparisons over time or across categories. Organized small maps might do the trick.