// Flips piece horizontally.
private Piece FlippedPiece()
{
StringBuilder newPieceMask = new StringBuilder();
//string newPieceMask = "";
// Top side
newPieceMask.Append(PieceMaskString.Substring(0, 5).ToCharArray().Reverse().ToArray());
// Right center
newPieceMask.Append(PieceMaskString.Substring(13, 3).ToCharArray().Reverse().ToArray());
// Bottom side
newPieceMask.Append(PieceMaskString.Substring(8, 5).ToCharArray().Reverse().ToArray());
// Left center
newPieceMask.Append(PieceMaskString.Substring(5, 3).ToCharArray().Reverse().ToArray());
//TODO: IS it incorrect to use the opposite of this.IsFlipped in the call below? Does that check out if things are rotated?
return(new Piece(newPieceMask.ToString(), Rotations, !IsFlipped, PieceID));
}
// Rotates piece 90 degrees clockwise * any number between 0 and 3.
private Piece RotatePiece(int rotateTimes90Degrees)
{
// Ensure rotateTimes90Degrees is between 0 and 3 before proceeding.
if (rotateTimes90Degrees < 0)
{
return(new Piece(this));
}
rotateTimes90Degrees %= 4;
// Kick out a duplicate piece of no rotation specified.
if (rotateTimes90Degrees == 0)
{
return(new Piece(this));
}
int pegShift = rotateTimes90Degrees * 4;
string newMaskString = PieceMaskString.Substring(16 - pegShift, pegShift);
newMaskString += PieceMaskString.Substring(0, 16 - pegShift);
return(new Piece(newMaskString, rotateTimes90Degrees, IsFlipped, PieceID));
}
