G9.js: Automatically Interactive Graphics
this is crazy. I wish they explained better how they solve the constraint to find the new point position.<p>Regardless this would be an awesome tool for Math Visualization.
The book "THE ELEMENTS OF EUCLID" [1] had a website with java applet but this is now dead since browser have dropped.<p>[1] <a href="https://www.c82.net/euclid/#books" rel="nofollow noreferrer">https://www.c82.net/euclid/#books</a>