private double Generate(double x)
{
int i0 = SimplexUtil.Floor(x);
int i1 = i0 + 1;
double x0 = x - i0;
double x1 = x0 - 1.0d;
double n0;
double n1;
double t0 = 1.0d - x0 * x0;
t0 *= t0;
n0 = t0 * t0 * SimplexUtil.Grad(perm[i0 & 0xff], x0);
double t1 = 1.0d - x1 * x1;
t1 *= t1;
n1 = t1 * t1 * SimplexUtil.Grad(perm[i1 & 0xff], x1);
return(0.395d * (n0 + n1));
}
private double Generate(double x, double y)
{
double n0;
double n1;
double n2;
double s = (x + y) * F2;
double xs = x + s;
double ys = y + s;
int i = SimplexUtil.Floor(xs);
int j = SimplexUtil.Floor(ys);
double t = (i + j) * G2;
double X0 = i - t;
double Y0 = j - t;
double x0 = x - X0;
double y0 = y - Y0;
int i1;
int j1;
if (x0 > y0)
{
i1 = 1;
j1 = 0;
}
else
{
i1 = 0;
j1 = 1;
}
double x1 = x0 - i1 + G2;
double y1 = y0 - j1 + G2;
double x2 = x0 - 1.0d + 2.0d * G2;
double y2 = y0 - 1.0d + 2.0d * G2;
int ii = SimplexUtil.Mod(i, 256);
int jj = SimplexUtil.Mod(j, 256);
double t0 = 0.5d - x0 * x0 - y0 * y0;
if (t0 < 0.0d)
{
n0 = 0.0d;
}
else
{
t0 *= t0;
n0 = t0 * t0 * SimplexUtil.Grad(perm[ii + perm[jj]], x0, y0);
}
double t1 = 0.5d - x1 * x1 - y1 * y1;
if (t1 < 0.0d)
{
n1 = 0.0d;
}
else
{
t1 *= t1;
n1 = t1 * t1 * SimplexUtil.Grad(perm[ii + i1 + perm[jj + j1]], x1, y1);
}
double t2 = 0.5d - x2 * x2 - y2 * y2;
if (t2 < 0.0d)
{
n2 = 0.0d;
}
else
{
t2 *= t2;
n2 = t2 * t2 * SimplexUtil.Grad(perm[ii + 1 + perm[jj + 1]], x2, y2);
}
return(40.0d * (n0 + n1 + n2));
}