public void Undo()
{
if (ivHistory.Count > 0)
{
ivSudoku = ivHistory.Pop();
Invalidate();
}
}
public SuDoKu_Field(SuDoKu_Field other)
{
ivDimension = other.ivDimension;
ivGroupSize = other.ivGroupSize;
ivCells = new SuDoKu_Cell[ivGroupSize, ivGroupSize];
for (int row = 0; row < ivGroupSize; row++)
{
for (int column = 0; column < ivGroupSize; column++)
{
ivCells[row, column] = new SuDoKu_Cell(other.ivCells[row, column]);
}
}
}
//------------------------------------------------------------
// Try to find the correct value for all cell that have
// only 2 options left
// return true if the state is still valid
public bool Solve_Twos()
{
for (int row = 0; row < ivGroupSize; ++row)
{
for (int column = 0; column < ivGroupSize; column++)
{
SuDoKu_Cell c = ivCells[row, column];
if (!c.isSet && c.Options_Count == 2)
{
SuDoKu_Field old = new SuDoKu_Field(this);
int v = c.Options_First;
set(row, column, v);
// if (! Solve_Ones() )
}
}
}
return(true);
}
//************************************************************
// the constructor
public SuDoKu()
{
InitializeComponent();
SetStyle(ControlStyles.UserPaint, true);
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
SetStyle(ControlStyles.DoubleBuffer, true);
ivBrush = new SolidBrush(this.ForeColor);
ivLine_Normal = new Pen(_GridColor, 2);
ivLine_Thick = new Pen(_GridColor, 4);
ivFormat = new StringFormat(StringFormatFlags.NoClip);
ivFormat.Alignment = StringAlignment.Center;
ivFormat.LineAlignment = StringAlignment.Center;
ivSudoku = new SuDoKu_Field(3);
ivHistory = new Stack <SuDoKu_Field>();
UpdateDimensions();
}