What's FirefoxOS plotting calculator?

Aim
This application is part of Mozilla Student Project from Université-d'Evry-Val-d'Essonne.
This project enables to print graph of Mathematic functions.

How does it work ?
1/ The application user enters the function definition parameters.
2/ The user click on the button "print the graph".
3/ The graph is printed.
4/ The button back on the top-left enables to repeat the process for another function.

Web interface The project is available at http://subasy.github.com/FirefoxOS-plotting-calculator/ .