public static T PickWeighted <T>(this IEnumerable <T> collection, RNG rng, double totalWeight, Func <T, double> weightSelectionFunc, T defaultValue = default(T))
{
double selection = rng.NextDouble(totalWeight);
foreach (T t in collection)
{
if (selection < weightSelectionFunc(t))
{
return(t);
}
selection -= weightSelectionFunc(t);
}
return(defaultValue);
}
