Chain Ring Counter

How to count the teeth? I suggest a little graphics hack that will superimpose an SVG gear over the chain ring photograph and then solve for tooth count. The g9.js reverse animator is made for this. mastodon

With g9, making an interactive visualization is as easy as making a visualization that isn't. Just write a function which draws shapes based on data, and g9 will automatically figure out how to manipulate that data when you drag the shapes around. site gallery

We'll take inspiration from two g9.js examples: "Three points define a circle" for finding center and radius and "Cube" for 3D projection.