/// <summary>
/// Returns a random number between -1 and 1
///
/// Note that this is my own crazy stuff adapted for this purpose only and do not necessarily correspond correctly to their names
/// in the mathematical sense
/// </summary>
/// <returns>The random.</returns>
/// <param name="randomType">Random type.</param>
static float GetRandom(RandomDistributionType randomType)
{
switch (randomType)
{
case RandomDistributionType.LINEAR:
return(Random.Range(-1f, 1f));
case RandomDistributionType.SQUARE_ROOT:
return(Mathf.Sqrt(Random.Range(0f, 0.5f)) * (Random.Range(0f, 1f) > 0.5f ? -1:1));
case RandomDistributionType.GAUSSIAN:
float u, v, S;
do
{
u = 2.0f * Random.Range(0f, 1f) - 1.0f;
v = 2.0f * Random.Range(0f, 1f) - 1.0f;
S = u * u + v * v;
}while (S >= 1.0f);
float fac = Mathf.Sqrt(-2.0f * Mathf.Log(S) / S);
fac = u * fac / 3f;
return(Mathf.Clamp(fac, -1f, 1f));
case RandomDistributionType.TWO_RANDS:
return(Random.Range(-1f, 1f) * Random.Range(0f, 1f));
case RandomDistributionType.THREE_RANDS:
return(Random.Range(-1f, 1f) * Random.Range(0f, 1f) * Random.Range(0f, 1f));
default:
return(Random.Range(-1f, 1f));
}
}
public static int[,] DiamondSquare(int heightMapSize, RandomDistributionType randomType, float hillyness)
{
MapGenerator.heightMapSize = heightMapSize;
MapGenerator.hillyness = hillyness;
MapGenerator.randomType = randomType;
// calculate heightmap
int[,] heightMap = new int[heightMapSize, heightMapSize];
//First set the four corners of the map
if (Random.Range(0f, 1f) < hillyness)
{
heightMap[0, 0] = GetRandomHeight(-heightMapSize / 4, heightMapSize / 4);
}
if (Random.Range(0f, 1f) < hillyness)
{
heightMap[0, heightMapSize - 1] = GetRandomHeight(-heightMapSize / 4, heightMapSize / 4);
}
if (Random.Range(0f, 1f) < hillyness)
{
heightMap[heightMapSize - 1, 0] = GetRandomHeight(-heightMapSize / 4, heightMapSize / 4);
}
if (Random.Range(0f, 1f) < hillyness)
{
heightMap[heightMapSize - 1, heightMapSize - 1] = GetRandomHeight(-heightMapSize / 4, heightMapSize / 4);
}
for (int halfStep = (heightMapSize - 1) / 2; halfStep > 0; halfStep /= 2)
{
for (int x = halfStep; x < heightMapSize - halfStep; x += 2 * halfStep)
{
for (int y = halfStep; y < heightMapSize - halfStep; y += 2 * halfStep)
{
DiamondStep(heightMap, halfStep, x, y);
}
}
}
return(heightMap);
}
/// <summary>
///
/// </summary>
/// <param name="distrubutionType"></param>
/// <param name="seed"></param>
/// <param name="m"></param>
/// <param name="n"></param>
public NRealMatrix RandomMatrix(RandomDistributionType distrubutionType, MCJIMatrix seed, int m, int n)
{
return(new NRealMatrix(_lib.randomMatrix(Convert.ToUInt16(distrubutionType), seed, m, n)));
}
/// <summary>
///
/// </summary>
/// <param name="distrubutionType"></param>
/// <param name="seed"></param>
/// <param name="m"></param>
/// <param name="n"></param>
public NRealMatrix RandomMatrix(RandomDistributionType distrubutionType, MCJIMatrix seed, int m,int n)
{
return new NRealMatrix(_lib.randomMatrix(Convert.ToUInt16(distrubutionType), seed, m, n));
}
