fov_demo.js

// this demo uses a class called Vector2, which can be found here: https://gist.github.com/3929297

// create a light source at position (9, 10)
var lightSource = new LightSource(new Vector2(9, 10), 10);

//  move the light source to position (10, 10);
lightSource.update(new Vector2(10, 10));