bool SolveBottomCornerPositions(ref List <string> path)
{
List <CubeInfo.Cubie> bottomCorners = _cubies.FindBottomCorners();
bool sorted = _cubies.BottomCornersSorted();
FocusCubie(new Vector3(-1, -2, -1));
for (int i = 0; i < _cubies.GetNumCubes(); i++)
{
if (!_cubies.IsCenterCube(i))
{
_cubies.EnableColor(_cubies.GetCubeInfo(i), false);
}
}
foreach (CubeInfo.Cubie c in bottomCorners)
{
_cubies.EnableColor(c, true);
}
// case 1: sorted but possible needs a rotation
// case 2: need to rotate three
// case 3: need to swap consecutive cubies
// case 4: need to swap opposite cubies
if (sorted)
{
string[] down = { "D", "D'", "D2", "" };
ArrayList steps = new ArrayList();
steps.Add(down);
path = _solver.Search(null, _solved, steps, _solver.ScorePositions);
}
else
{
ArrayList steps = new ArrayList();
string[] down = { "D", "D'", "D2", "" };
string[] sequences =
{
// rotate C
"L' D R D' L D R' D'",
"F' D B D' F D B' D'",
"R' D L D' R D L' D'",
"B' D F D' B D F' D'",
// rotate CC
"D R D' L' D R' D' L",
"D B D' F' D B' D' F",
"D L D' R' D L' D' R",
"D F D' B' D F' D' B",
// swap consecutive
"F D' B' D F' D' B D2",
"B D' F' D B' D' F D2",
"L D' R' D L' D' R D2",
"R D' L' D R' D' L D2",
// swap non-consecutive
"D F D L D' L' F'",
"D R D F D' F' R'",
"D B D R D' R' B'",
"D L D B D' B' L'"
};
// ASN TODO: We know the sequence if we analyze the cube more closely
foreach (string seqn in sequences)
{
steps.Clear();
//steps.Add(down);
string[] words = seqn.Split();
foreach (string word in words)
{
string[] tmp = { word };
steps.Add(tmp);
}
path = _solver.Search(null, _solved, steps, _solver.ScorePositions);
if (path.Count > 0)
{
break;
}
}
}
return(path.Count > 0);
}