/// <summary>
/// Gibt den Farbunterschied eines weißen Kantensteins zurück
/// </summary>
/// <param name="edge">Der Kantenstein, dessen Farbunterschied bestimmt werden soll</param>
/// <returns></returns>
protected int GetDelta(EdgeStone edge)
{
CubeColor edgeColor = edge.GetColors().First(c => c != WHITE);
CubeFace face = edge.GetColorPosition(c => c != WHITE).Face;
return(SolvingUtility.GetDelta(edgeColor, face, UP));
}
/// <summary>
/// Gibt die zweite Farbe eines weißen Kantensteins zurück
/// </summary>
/// <param name="edge">Der Kantenstein, dessen zwiete Farbe bestimmt werden soll</param>
/// <returns></returns>
protected CubeColor GetSecondColor(EdgeStone edge)
{
IEnumerable <CubeColor> colors = edge.GetColors();
if (!colors.Contains(WHITE))
{
throw new ArgumentException("Der Kantenstein muss die Farbe Weiß besitzen");
}
return(colors.First(c => c != WHITE));
}
/// <summary>
/// Gibt die Anzahl der Züge zurück, die benötigt wird, um den Kantenstein in die richtige Position zu bringen.
/// </summary>
/// <param name="edge">Der Kantenstein, der in die richtige Position gebracht werden soll</param>
/// <returns></returns>
protected int GetStoneRating(EdgeStone edge)
{
// on white face and same delta as pivot stone
if (IsEdgeRight(edge))
{
return(0);
}
Position whitePosition = edge.GetColorPosition(WHITE);
int edgeDelta;
// on white face and not same delta as pivot stone or on yellow face
if (whitePosition.Face == UP || whitePosition.Face == DOWN)
{
// get delta of edge
if (whitePosition.Face == DOWN)
{
edgeDelta = SolvingUtility.GetDelta(
GetSecondColor(edge), // second color
edge.GetColorPosition(c => c != WHITE).Face, // second color face color
UP); // face to rotate
}
else
{
edgeDelta = GetDelta(edge);
}
// return 2 + moves white face count
int sortingMoves = Math.Abs(SolvingUtility.NormalizeCount(edgeDelta - WhiteFaceOrientation, -1));
return(2 + sortingMoves);
}
// on middle layer
else
{
switch (whitePosition.Tile)
{
// false orientated on white face
case 1:
edgeDelta = SolvingUtility.GetDelta(
GetSecondColor(edge), //second color
edge.GetColorPosition(WHITE).Face, // middle layer face with white side of edge
UP); //face to rotate
int edgePivotDelta = SolvingUtility.NormalizeCount(edgeDelta - WhiteFaceOrientation);
// return number of moves
return((edgePivotDelta % 2) * -1 + 3);
// false orientated on yellow face
case 7:
// this position can always solved in 3 moves
return(3);
// on middle layer
default:
edgeDelta = SolvingUtility.GetDelta(
edge.GetColors().First(c => c != WHITE), // second color
edge.GetColorPosition(c => c != WHITE).Face, // second color face color
UP); // face to rotate
int sortingMoves = Math.Abs(SolvingUtility.NormalizeCount(edgeDelta - WhiteFaceOrientation, -1));
return(1 + sortingMoves);
}
}
}