public List <DeskSquareModel> FindKnightsPath(FigureModel knightPosition, FigureModel figure, List <FigureModel> friendlyFigures)
{
var movesQueue = new Queue <List <DeskSquareModel> >();
var visitedList = new List <DeskSquareModel>();
visitedList.AddRange(friendlyFigures);
var TheShortestPath = new List <DeskSquareModel>
{
knightPosition
};
movesQueue.Enqueue(TheShortestPath);
while (movesQueue.Count != 0)
{
List <DeskSquareModel> currentPath = movesQueue.Dequeue();
DeskSquareModel currentSquare = currentPath.Last();
if ((currentSquare.X == figure.X) && (currentSquare.Y == figure.Y))
{
return(currentPath);
}
var allPossibleMoves = GetAllKnightMoves(currentSquare);
foreach (var nearSquare in allPossibleMoves)
{
if (!visitedList.Any(x => x.X == nearSquare.X && x.Y == nearSquare.Y))
{
var moves = new List <DeskSquareModel>();
moves.AddRange(currentPath);
moves.Add(nearSquare);
visitedList.Add(nearSquare);
movesQueue.Enqueue(currentPath);
movesQueue.Enqueue(moves);
}
}
}
//No way in here to capture all the figures, returning empty list.
return(new List <DeskSquareModel>());
}
private List <DeskSquareModel> GetAllKnightMoves(DeskSquareModel square)
{
var possiblePositions = new List <DeskSquareModel>();
foreach (var move in KnightMoves)
{
var x = move.Item1;
var y = move.Item2;
var newX = move.Item1 + square.X;
var newY = move.Item2 + square.Y;
if (FigureBehavior.IsValidCoordinates(newX, newY))
{
possiblePositions.Add(new DeskSquareModel()
{
X = newX, Y = newY
});
}
}
return(possiblePositions);
}