public static int GetIntValue(string value, Random r)
{
//There are three possible types of "value"
//The first is a basic value, like "5", it is always returned
//The second is a range of values, like "0,5", randomly pick one inside the range
//The third is a weighted range of values, like "0,1,0.05" which leans toward 0 with 5% chance of picking 1
string[] parts = value.Split(new[] { ',' });
if (parts.Length == 1)
{
//Just return the value
return int.Parse(parts[0]);
}
if (parts.Length == 2)
{
//return a value in the range
return r.Next(int.Parse(parts[0]), int.Parse(parts[1]) + 1);
}
if (parts.Length == 3)
{
//return a value in the weighted range
double randVal;
do
{
randVal = r.NextDouble();
} while (randVal == 0); //Make sure it's not 0, otherwise it'd throw an exception in the next line of code
double weight = NormalCDFInverse(randVal);
int min = int.Parse(parts[0]);
int max = int.Parse(parts[1]);
float shift = float.Parse(parts[2], CultureInfo.InvariantCulture); //Shift moves the standard distribution left or right (does not skew it, just moves it, 0.5 is default)
int newValue = (int)(((min + max) * shift) + (weight * (max - min)));
if (newValue < min)
{
return min;
}
if (newValue > max)
{
return max;
}
return newValue;
}
throw new Exception("GetIntValue cannot parse the value of '" + value + "'");
}
