/**
* determines if the given GridCell is a valid move for the given player
*/
private bool isValidMove(ReversiGraph graph, ReversiGraph.GridCell given, Player player)
{
if (given.State != ReversiGraph.CellState.EMPTY)
{
return(false);
}
ReversiGraph.CellState seeking = GetSeekingState(player);
//loop through each possible direction to determine if a move is possible
foreach (Direction direction in (Direction[])Enum.GetValues(typeof(Direction)))
{
if (given.Edges.ContainsKey(direction))
{
//traverse the current direction, a move is valid only if we find another same state cell AT LEAST two cells away.
int depth = graph.Traverse(given, seeking, direction, null, 0);
if (depth > 1)
{
return(true);
}
}
}
return(false);
}
/**
* performs a move for the given player
*/
private void performMove(ReversiGraph graph, ReversiGraph.GridCell given, Player player)
{
if (given.State != ReversiGraph.CellState.EMPTY)
{
return;
}
//if ( currentTurn != player ) return;
//instantiate a new hashset which will be used to keep track of any grid cells which need to be flipped as a result of this move
HashSet <ReversiGraph.GridCell> flipsNeeded = new HashSet <ReversiGraph.GridCell>();
//determine which color we are seeking
ReversiGraph.CellState seeking = GetSeekingState(player);
//loop through each possible direction and flip any necessary pieces
foreach (Direction direction in (Direction[])Enum.GetValues(typeof(Direction)))
{
//traverse the given direction if needed
if (given.Edges.ContainsKey(direction))
{
//traverse the direction
graph.Traverse(given, seeking, direction, flipsNeeded, 0);
}
}
//we don't need to flip the current cell (although the code is structured such that this would not cause an issue)
flipsNeeded.Remove(given);
//go through and flip each of the cells which need to be flipped
foreach (ReversiGraph.GridCell cell in flipsNeeded)
{
cell.Flip(graph == gameGraph);
}
//place a piece at the current position, only if we are working with the actual game board
if (gameGraph == graph)
{
Quaternion rotation = (player == Player.WHITE ? Quaternion.identity : new Quaternion(0f, 0f, 3.1415f, 0f));
GameObject newPiece = (GameObject)Instantiate(gamePiece, given.SpawnPoint, rotation);
given.State = seeking;
given.Model = newPiece;
}
}
/**
* this method will be invoked by the script attached to a square on the Reversi board
*/
public void itemClicked(string name)
{
if (aiVSai || currentTurn == Player.BLACK)
{
return;
}
ReversiGraph.GridCell selected = gameGraph.Cells[name];
if (isValidMove(gameGraph, selected, Player.WHITE))
{
performMove(gameGraph, selected, Player.WHITE);
//now process a move for the AI
currentTurn = Player.BLACK;
aiMoveReady = true;
}
else
{
print("NOT VALID LOLZ");
}
}
