public void RandomShuffle <T>(List <T> elements)
{
int n = elements.Count();
for (int i = n - 1; i > 0; --i)
{
Mathnv.Swap(elements, i, Rand(i + 1));
}
}
// random normalized vector
//from [ [min.x,min.y] , [max.x,max.y] ]
public Vector3 RandVec3Normalized(float min, float max)
{
if (min > max)
{
Mathnv.Swap(ref min, ref max);
}
Vector3 vec = new Vector3(Rand(min, max), Rand(min, max), Rand(min, max)).normalized;
vec.Normalize();
return(vec);
}
// rolling min or max will be rare, but rolling exactly between the two will be common
public double GaussianRandom(double min, double max)
{
if (min == max)
{
return(min);
}
if (min > max)
{
Mathnv.Swap <double>(ref min, ref max);
}
min /= 3;
max /= 3;
return(Rand(min, max) + Rand(min, max) + Rand(min, max));;
}
public double Rand(double a, double b)
{
if (a == b)
{
return(a);
}
if (a > b)
{
Mathnv.Swap(ref a, ref b);
}
double c = b - a;
return(a + Randd() * c);
}
public float Rand(float a, float b)
{
if (a == b)
{
return(a);
}
if (a > b)
{
Mathnv.Swap(ref a, ref b);
}
float c = b - a;
return(a + Randf() * c);
}
public int Rand(int a, int b)
{
if (a == b)
{
return(a);
}
if (a > b)
{
Mathnv.Swap(ref a, ref b);
}
int c = b - a;
return(a + Randi() % c);
}
//random point in an area
public Vector2 Rand(Vector2 a, Vector2 b)
{
if (a.x > b.x)
{
Mathnv.Swap(ref a.x, ref b.x);
}
if (a.y > b.y)
{
Mathnv.Swap(ref a.y, ref b.y);
}
float cx = b.x - a.x;
float cy = b.y - a.y;
return(new Vector2(a.x + Randf() * cx, a.y + Randf() * cy));
}
public uint Rand(uint a, uint b)
{
if (a == b)
{
return(a);
}
if (a == 0)
{
return(Rand(b));
}
if (a > b)
{
Mathnv.Swap(ref a, ref b);
}
uint n = 2 * b;
uint m = a + b;
uint c = n % m;
return(a + Rand() % c);
}