public GridLocation(int row, int col)
{
if (!NeighborStack.Peek().AllowNegative&& (row < 0 || col < 0))
{
throw new ArgumentException();
}
Row = row;
Col = col;
}
public IEnumerable <GridLocation> Neighbors()
{
var info = NeighborStack.Peek();
for (var idRow = -1; idRow <= 1; idRow++)
{
for (var idCol = -1; idCol <= 1; idCol++)
{
if (idCol == 0 && idRow == 0)
{
if (info.IncludeOriginalCell)
{
yield return(this);
}
continue;
}
if (idCol != 0 && idRow != 0 && info.F4Neighbors)
{
continue;
}
var curRow = Row + idRow;
var curCol = Col + idCol;
if (info.FWrap)
{
// We ignore AllowNegatives in this case
if (curRow < 0)
{
curRow += info.CRows;
}
else if (curRow >= info.CRows)
{
curRow -= info.CRows;
}
if (curCol < 0)
{
curCol += info.CCols;
}
else if (curCol >= info.CCols)
{
curCol -= info.CCols;
}
}
else
{
if ((!info.AllowNegative && (curRow < 0 || curCol < 0)) || curRow >= info.CRows || curCol >= info.CCols)
{
continue;
}
}
yield return(new GridLocation(curRow, curCol));
}
}
}
public NeighborInfo(
int cRows = int.MaxValue,
int cCols = int.MaxValue,
bool f4Neighbors = true,
bool fWrap = false,
bool includeOriginalCell = false,
bool allowNegative = false)
{
F4Neighbors = f4Neighbors;
FWrap = fWrap;
CRows = cRows;
CCols = cCols;
IncludeOriginalCell = includeOriginalCell;
AllowNegative = allowNegative;
NeighborStack.Push(this);
}
public void Dispose()
{
NeighborStack.Pop();
}
