It uses a homebrew kernel based on functional representations (http://en.wikipedia.org/wiki/Function_representation http://en.wikipedia.org/wiki/Function_repres

It uses a homebrew kernel based on functional representations (http://en.wikipedia.org/wiki/Function_representation http://en.wikipedia.org/wiki/Function_representation). Any function that comes out the end of the graph is rendered (as a bitmap) and blitted to the screen.