private void ApplyMove(GameState game)
{
int dR, dC;
if (Direction == MoveDirection.Left)
{
dR = 0;
dC = -1;
}
else if (Direction == MoveDirection.Right)
{
dR = 0;
dC = 1;
}
else if (Direction == MoveDirection.Up)
{
dR = 1;
dC = 0;
}
else
{
dR = -1;
dC = 0;
}
PieceStack stack = game.Board[Row, Column].Grab(NumMoved);
for (int i = 0; i < Drops.Count; i++)
{
int row = Row + dR * (i + 1);
int col = Column + dC * (i + 1);
PieceStack dst = game.Board[row, col];
stack.Drop(dst, Drops[i]);
}
}
private bool IsLegalMove(GameState game, out string reason)
{
TakBoard boardState = game.Board;
// if we're moving more pices than are in the stack
if (boardState[Row, Column].Size < NumMoved || boardState[Row, Column].Size == 0)
{
reason = "Not enough pieces in stack";
return(false);
}
// we actually own the stack being moved
if (boardState[Row, Column].Top.Color != PieceColor)
{
reason = "Stack belongs to another player";
return(false);
}
// if we're moving more pieces than the carry limit
if (boardState.Size < NumMoved)
{
reason = "Carry limit exceeded";
return(false);
}
// if we're moving so far that we'd fall off the edge of the board
if ((Direction == MoveDirection.Up && Row + Drops.Count >= boardState.Size) ||
(Direction == MoveDirection.Down && Row - Drops.Count < 0) ||
(Direction == MoveDirection.Right && Column + Drops.Count >= boardState.Size) ||
(Direction == MoveDirection.Left && Column - Drops.Count < 0))
{
reason = "Not enough room to move in that direction";
return(false);
}
// if we're placing non-capstones on walls, or any piece on a capstone
int dR, dC;
if (Direction == MoveDirection.Left)
{
dR = 0;
dC = -1;
}
else if (Direction == MoveDirection.Right)
{
dR = 0;
dC = 1;
}
else if (Direction == MoveDirection.Up)
{
dR = 1;
dC = 0;
}
else
{
dR = -1;
dC = 0;
}
PieceStack src = boardState[Row, Column].NonDestructiveGrab(NumMoved);
for (int i = 0; i < Drops.Count; i++)
{
int row = Row + dR * (i + 1);
int col = Column + dC * (i + 1);
PieceStack dst = boardState[row, col];
if (!src.CanDrop(dst, Drops[i]))
{
reason = string.Format("Cannot drop piece on {0}{1}", (char)(col + 'a'), row + 1);
return(false);
}
src.Drop(Drops[i]);
}
// if we reach here then the move is legal
reason = "";
return(true);
}
