Life & fun · September 24, 2016
G9.js – Automatically Interactive Differentiable Graphics
G9.js – Automatically Interactive Differentiable Graphics launched on September 24, 2016 with 237 votes, #94 of 3,743 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 10 years on.
In plain words
G9.js is a JavaScript library that creates interactive graphics automatically through differentiation. Developers provide initial numeric data and a render function that draws based on that data, then users can interactively adjust values by manipulating the visual elements on screen. The library handles the mathematical relationship between data and graphics, making it useful for creating exploratory visualizations, educational tools, and interactive demonstrations without manually coding interaction logic.
written from the facts on this page · September 2026
From the sources
I've tried to organize stuff from basic to advanced, so you can scroll from the top to get an intuitive feel for g9. It's worth mentioning, of course, that intuitive feeling is no match for reading the docs . g9.js exposes a single function, g9(initialData, render[, onChange]) . This represents the following flow: In order to avoid repetion, every example gets a special function _special_log that shows its arguments in a floating box. A minimal example with only two points. Our render function always draws one point at (x, y), and the other point at (y, x), so when you drag one of the points, the other kind of mirrors it. Try adding a minus sign before the first argument of the first point.…from omrelli.ug
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