public static IEnumerable <T> TakeRandomFrom <T>(this IRandomizer randomizer, IEnumerable <T> source, int count)
{
var availableCount = source.Count();
if (availableCount == 0)
{
throw new Exception("Unable to pick random number from empty list");
}
if (availableCount == count)
{
return(source);
}
var randomElements = new List <T>();
for (var i = 0; i < count; i++)
{
var random = randomizer.Random(0, availableCount - 1);
var randomElement = source.Skip(random).First();
if (randomElements.Contains(randomElement))
{
i--;
continue;
}
randomElements.Add(randomElement);
}
return(randomElements);
}
public static T TakeRandomFrom <T>(this IRandomizer randomizer, IEnumerable <T> source)
{
var availableCount = source.Count();
if (availableCount == 0)
{
throw new Exception("Unable to pick random number from empty list");
}
var random = randomizer.Random(0, availableCount - 1);
return(source.Skip(random).First());
}
public static float Random(this IRandomizer randomizer, ICurveFunction curve, float minValue, float maxValue)
{
var randomNumber = randomizer.Random(minValue, maxValue);
var isNegative = minValue < 0;
if (isNegative)
{
randomNumber = Math.Abs(randomNumber);
maxValue = Math.Abs(minValue);
}
var result = curve.ScaledPlot(randomNumber, maxValue);
return(isNegative ? -result : result);
}
public double Random(double lower, double upper, bool floating)
{
var result = lower + _random.Random() * upper;
return(floating ? result : (result < 0 ? _lodashMath.Ceil(result) : _lodashMath.Floor(result)));
}
public static float Random(this IRandomizer randomizer, ICurveFunction curve)
{
var randomNumber = randomizer.Random();
return(curve.Plot(randomNumber));
}