//handling correct calling of SudokuSolver and actually solving it if possible
public void SolveSudoku()
{
if (sudoku.TrySolve())
{
sudoku.Solve(); //Solve changes sudoku
printer.PrintSudokuInGrid(sudoku); //printer shows sudoku to the user
}
else
{
ShowMessageBoxImpossibleSudoku(); // not possible to solve
}
}
public Sudoku GenerateNewSudoku(string difficulty)
{
int baseNumberToRemove = 0;
//we change the number as we know the difficutly
switch (difficulty)
{
case "easy": baseNumberToRemove = 10; break;
case "medium": baseNumberToRemove = 20; break;
case "hard": baseNumberToRemove = 30; break;
}
sudoku = new Sudoku();
FillSudokuWithZeros();
sudoku.Solve(); //actually fills up the whole Sudoku
int numberToRemove = baseNumberToRemove + rnd.Next(7);
int row = 0;
int column = 0;
int stored = 0;
while (numberToRemove != 0)
{
//getting random cell
row = rnd.Next(9);
column = rnd.Next(9);
// if the cell is not already empty
if (!sudoku.Grid[row, column].IsEmpty())
{
stored = sudoku.Grid[row, column].Num;
sudoku.Grid[row, column].Num = 0;
//if we can solve sudoku with stored number erased
if (!sudoku.TrySolve())
{
//we cant solve it now so put it back in
sudoku.Grid[row, column].Num = stored;
numberToRemove++;
}
//sudoku.Grid[row, column].Num = 0;
numberToRemove--;
}
}
for (int i = 0; i < Globals.Size; i++)
{
for (int j = 0; j < Globals.Size; j++)
{
if (sudoku.Grid[i, j].Num != 0)
{
sudoku.Grid[i, j].IsChangeable = false;
}
}
}
return(sudoku);
}
