noise2 method

@override double noise2(double x, double y)

Implementation

@override
double noise2(double x, double y) {
  int xr = round(x);
  int yr = round(y);

  double distance = 999999;
  int xc = 0, yc = 0, zc = 0;
  for (int xi = xr - 1; xi <= xr + 1; xi++) {
    for (int yi = yr - 1; yi <= yr + 1; yi++) {
      D2 vec = CELL_2D[hash2D(seed, xi, yi) & 255];
      double vecX = xi - x + vec.x;
      double vecY = yi - y + vec.y;
      double newDistance =
          (vecX.abs() + vecY.abs()) + (vecX * vecX + vecY * vecY);

      if (newDistance < distance) {
        distance = newDistance;
        xc = xi;
        yc = yi;
      }
    }
  }

  return valCoord2D(0, xc, yc);
}