Also my ancient and somewhat creaky engine, but perhaps a starting point: http://langintro.com/js-vine/ http://langintro.com/js-vine/ (there's a github link on

Also my ancient and somewhat creaky engine, but perhaps a starting point: http://langintro.com/js-vine/ http://langintro.com/js-vine/ (there's a github link on that page), and this more advanced one that uses canvas: https://github.com/loner02/vn-canvas https://github.com/loner02/vn-canvas