public bool TryPreviewAt(BoardStackPosition mouseOver)
{
if (!_game[mouseOver.Position].HasValue)
{
_boardView.CarryVisible = false;
_move = new PlacePieceMove(_pieceID, mouseOver.Position);
_move.MakeMove(_game);
_boardView.InvalidateRender();
_boardView.SetHighlight(mouseOver.Position, 0);
return(true);
}
return(false);
}
public bool TryPreviewAt(BoardStackPosition mouseOver)
{
if (_game.Ply < 2)
{
return(false);
}
_boardView.CarryVisible = true;
var mouseOverPos = mouseOver.Position;
if ((_move == null || (_move.PickUpMove.Position == mouseOver.Position && !_move.UnstackDirection.HasValue)) &&
mouseOver.StackPos.HasValue)
{
int carryCount = 0;
if (_move != null)
{
carryCount = _move.PickUpMove.PickUpCount;
}
var stack = _game.Board[mouseOverPos.X, mouseOverPos.Y];
if (stack.Count == 0)
{
return(false);
}
if (carryCount == 0 && Piece.GetPlayerID(stack[stack.Count - 1]) != (_game.Ply & 1))
{
return(false);
}
int pickUpCount = stack.Count - mouseOver.StackPos.Value;
if (pickUpCount + carryCount <= _game.Size)
{
_previewPickup = new PickUpMove(mouseOverPos, stack.Count - mouseOver.StackPos.Value, _game);
_boardView.SetHighlight(mouseOverPos, mouseOver.StackPos);
return(true);
}
}
else
{
// check for placing pieces
if (_move == null)
{
return(false);
}
var placingPiece = _move.PickUpMove.PickUpPieces[_move.Count - 1];
var covering = _game[mouseOverPos];
bool flatten = false;
if (covering.HasValue)
{
// cannot put piece on top of cap stone
if (Piece.GetStone(covering.Value) == Piece.Stone_Cap)
{
return(false);
}
// standing stone only gets flattened by cap stone
if (Piece.GetStone(covering.Value) == Piece.Stone_Standing)
{
if (Piece.GetStone(placingPiece) != Piece.Stone_Cap)
{
return(false);
}
else
{
flatten = true;
}
}
}
// validate direction
var unstackDir = _move.UnstackDirection;
if (!unstackDir.HasValue)
{
var delta = mouseOverPos - _move.PickUpMove.Position;
if (Math.Abs(delta.X) + Math.Abs(delta.Y) != 1)
{
return(false);
}
}
else
{
var lastPlacedAt = ((InterPlacePieceMove)_move[_move.Count - 1]).Pos;
var delta = mouseOverPos - lastPlacedAt;
if (delta != BoardPosition.Zero &&
mouseOverPos != Direction.Offset(lastPlacedAt, unstackDir.Value))
{
return(false);
}
}
_previewPickup = null;
_previewPlace = new InterPlacePieceMove(placingPiece, mouseOverPos, false, flatten);
_previewPlace.MakeMove(_game);
_boardView.CarryRemoveBottom();
_boardView.SetHighlight(mouseOverPos, _game.Board[mouseOverPos.X, mouseOverPos.Y].Count - 1);
_boardView.InvalidateRender();
_boardView.CarryVisible = true;
return(true);
}
return(false);
}