public void TestIRandomExtensionMethods()
{
IRandom rand = new TinyMT();
rand.Init(1); // 2545341989 will be the first number
Assert.IsTrue(rand.Generate(0, 5) == 4); // 2545341989 % 5 = 4
rand.Init(1);
Assert.IsTrue(rand.Generate(1, 6) == 5); // 2545341989 % 5 + 1 = 5
rand.Init(1);
Assert.IsTrue(rand.PickElement(new uint[] { 0, 1, 2, 3, 4 }) == 4); // 2545341989 % 5 = 4, so 4th element
rand.Init(1);
Assert.IsTrue(rand.DieRoll(10) == 10); // last digit of 2545341989 plus one
RandomRange range = new RandomRange(0, 10, 3);
rand.Init(1);
// first random number: 2545341989 % 10 = 9
// second random number: 981918433 % 10 = 3
// third random number: 3715302833 % 10 = 3
// total: 15, over three passes: result = 5
Assert.IsTrue(rand.Generate(range) == 5);
}
/// <summary>
/// Generates the next random value in the half-open range [range.min, range.max)
/// with a distribution specified by the range.passes value.
/// </summary>
/// <param name="rng"></param>
/// <param name="range"></param>
/// <returns></returns>
public static int Generate(this IRandom rng, RandomRange range)
{
long total = 0;
for (int i = 0; i < range.passes; i++)
{
total += rng.Generate(range.from, range.to);
}
return((int)(total / range.passes));
}