core/: General purpose methods and variables that are used throughout the d3 source, such as a class subtyping utility and a method rebinding utility.compat/: Compatibility between browsers, namely getting the current time and the ability to set styles on DOM elements.Also defines convenience functions for each color representation, like brighter and darker methods. color/: Different color representations, such as rgb, hcl, and hsl.For zoom, it handles redisplaying of data. behavior/: Behavior of drag (including touch drags) and zoom events.Since the array is the main form of data representation in d3, these methods serve as the basis for manipulating data. arrays/: Various array methods such as min, bisect, zip, and nest.
If a file didn’t make sense, I looked at the corresponding tests and the d3 wiki. My approach of reading the code was to follow the order of imports in each index.js. Each subfolder in src/ has an index.js which imports the relevant of the files. All the relevant code is in the src/ folder. I assume you have some familiarity with d3 (a couple of tutorials should be good enough), because I won’t spend time explaining the basics. This post is for those who want to understand d3’s internals. But if you’ve ever used d3, you’ve probably wondered how the magic really is created. It has a relatively simple interface that is backed by a powerful and extensible engine. It is an amazing data visualization library that makes it easy to create interactive graphs on the web. d3, created by Mike Bostock and maintained by Bostock and Jason Davies, is the fourth most starred repository on GitHub. New York Times), chances are that it is being powered by d3.js. If you’ve ever seen an interactive visualization on a website (ex.
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