// Generates n distinct colors.
// l is the fixed lightness, the L in LAB color space.
// r is the radius of the circle in AB space along which points are taken.
// Documented at http://bl.ocks.org/curran/dd73d3d8925cdf50df86
define([], function (){
  var lDefault = 50,
      rDefault = 100;
  return function generateColors(n, l, r){
    var colors = [], a, b, θ;
    l = l || lDefault;
    r = r || rDefault;
    for(var i = 0; i < n; i++){
      θ = (i / n) * Math.PI * 2;
      a = Math.sin(θ) * r;
      b = Math.cos(θ) * r;
      colors.push(d3.lab(l, a, b).toString());
    }
    return colors;
  }
});