Enhance curve's cusp handling to fix self intersections in large stroked curves

[bourgesl]

Todo: put screenshots of artefacts and compare with paper.js framework

[bourgesl]

To fix marlin's bezier quad or cubic issues, I found how to solve accurately:

• quadratics: http://people.eecs.berkeley.edu/~wkahan/Qdrtcs.pdf
• cubics: http://people.eecs.berkeley.edu/~wkahan/Math128/Cubic.pdf

So happy !

See
http://people.eecs.berkeley.edu/~wkahan/Math128/