// c'tor
public Board()
{
// create the groups
for (int i = 0; i < 9; i++)
{
rows[i] = new Group();
cols[i] = new Group();
squares[i] = new Group();
}
// create the boxes
for (int j = 0; j < 9; j++)
{
for (int i = 0; i < 9; i++)
{
Box newBox = new Box(this);
boxes[i, j] = newBox;
cols[i].AddBox(newBox);
newBox.AssignToGroup(cols[i]);
rows[j].AddBox(newBox);
newBox.AssignToGroup(rows[j]);
int iSquare = ((j / 3) * 3) + (i / 3);
squares[iSquare].AddBox(newBox);
newBox.AssignToGroup(squares[iSquare]);
}
}
// Keep making picks until board is filled
do
{
int iRow = iPick / 9;
int iCol = iPick - (iRow * 9);
if (boxes[iRow, iCol].MakePick())
{
iPick++;
}
else
{
iPick--;
}
} while (iPick < 81);
}
/// <summary>
/// A group is notifying this box that a value previously in use is now available to the group. Consider it
/// to be available this box if it does not conflict with one of this box's other groups.
/// </summary>
/// <param name="fromGroup"></param>
/// <param name="val"></param>
public void AddAvailableVal(Group fromGroup, int val)
{
bool fOK = true;
foreach (Group g in groups)
{
if (g != fromGroup && g.IsValueInUse(val))
{
fOK = false;
break;
}
}
if (fOK && !availableVals.Contains(val))
{
availableVals.Add(val);
}
}
/// <summary>
/// Let this box know it is in the group.
/// </summary>
/// <param name="g"></param>
public void AssignToGroup(Group g)
{
groups.Add(g);
}