/**
* Returns the order in which a specified subcell is visited by the Hilbert
* curve. This is the inverse of {@link #posToIJ}.
*
* @param orientation the subcell orientation, in the range [0,3].
* @param ijIndex the subcell index where
* {@code 0->(0,0), 1->(0,1), 2->(1,0), 3->(1,1)}.
* @return the position of the subcell in the Hilbert traversal, in the range
* [0,3].
* @throws IllegalArgumentException if either parameter is out of bounds.
*/
public static int IjToPos(int orientation, int ijIndex)
{
Preconditions.CheckArgument(0 <= orientation && orientation < 4);
Preconditions.CheckArgument(0 <= ijIndex && ijIndex < 4);
return(_IjToPos[orientation][ijIndex]);
}
public static int PosToOrientation(int position)
{
Preconditions.CheckArgument(0 <= position && position < 4);
return(_PosToOrientation[position]);
}
