public static SudokuGrid Generate(SudokuGrid.Difficulty difficulty)
{
SudokuGrid generatedGrid = new SudokuGrid(ReadySudokus[randGenerator.Next(0, ReadySudokus.Length - 1)], difficulty, false);
for (int transposeCount = 0; transposeCount < TransposeLimit; transposeCount++)
{
for (int groupSwapCount = 0; groupSwapCount < GroupSwapsLimit; groupSwapCount++)
{
for (int rowSwapCount = 0; rowSwapCount < RowSwapsLimit; rowSwapCount++)
{
generatedGrid.Transform(SudokuGrid.TransformType.SwapRows);
}
generatedGrid.Transform(SudokuGrid.TransformType.SwapGroups);
}
generatedGrid.Transform(SudokuGrid.TransformType.Transpose);
}
#region Remove some numbers.
int cellsToRemove = 0, emptyRowsLimit = 0;
switch (difficulty)
{
case SudokuGrid.Difficulty.Easy:
cellsToRemove = EasyDifficultyInitEmptyCells;
emptyRowsLimit = EasyDifficultyMaxEmptyRows;
break;
case SudokuGrid.Difficulty.Medium:
cellsToRemove = MediumDifficultyInitEmptyCells;
emptyRowsLimit = MediumDifficultyMaxEmptyRows;
break;
case SudokuGrid.Difficulty.Hard:
cellsToRemove = HardDifficultyInitEmptyCells;
emptyRowsLimit = HardDifficultyMaxEmptyRows;
break;
}
generatedGrid.EmptyCells = cellsToRemove;
int cellsRemoved = 0;
int rowsRemoved = 0;
int row, col;
const int IndexLimit = SudokuGrid.SudokuDimension - 1;
while (cellsRemoved <= cellsToRemove)
{
row = randGenerator.Next(0, IndexLimit);
col = randGenerator.Next(0, IndexLimit);
if (!(generatedGrid.IsSingleInRow(row, col) && rowsRemoved > emptyRowsLimit))
{
generatedGrid.ClearCell(row, col);
cellsRemoved++;
}
}
#endregion
return(generatedGrid);
}
private void NewGame(SudokuGrid.Difficulty difficulty)
{
grid = SudokuGenerator.Generate(difficulty);
for (int row = 0; row < 9; row++)
{
for (int col = 0; col < 9; col++)
{
cells[row, col].RefreshValues(grid[row, col], grid.IsEditable(row, col));
}
}
RefreshCellValues();
}
