internal List <int?> Scan(int row, int column)
//Returns a List object of all the possibilities for a given square
{
SudokuNumber sd = entries[CurrentEntry(row, column)];
List <int?> rowPossibilities = new List <int?> {
1, 2, 3, 4, 5, 6, 7, 8, 9
};
List <int?> columnPossibilities = new List <int?> {
1, 2, 3, 4, 5, 6, 7, 8, 9
};
List <int?> gridPossibilities = new List <int?> {
1, 2, 3, 4, 5, 6, 7, 8, 9
};
int?value = entries[CurrentEntry(row, column)].value;
entries[CurrentEntry(row, column)].value = null;
for (int i = 1; i < 10; i++)
{
if (entries[CurrentEntry(i, column)].correct)
{
rowPossibilities.Remove(entries[CurrentEntry(i, column)].value);
}
if (entries[CurrentEntry(row, i)].correct)
{
columnPossibilities.Remove(entries[CurrentEntry(row, i)].value);
}
}
int grid = GetGrid(row, column);
int[] gridCorner = GetGridCorner(grid);
for (int i = gridCorner[0]; i < (gridCorner[0] + 3); i++)
{
for (int j = gridCorner[1]; j < (gridCorner[1] + 3); j++)
{
if (entries[CurrentEntry(i, j)].correct)
{
gridPossibilities.Remove(entries[CurrentEntry(i, j)].value);
}
}
}
entries[CurrentEntry(row, column)].value = value;
sd.possibilities = rowPossibilities.Intersect(columnPossibilities.Intersect(gridPossibilities)).ToList();
return(sd.possibilities);
}
void MyButtonClick(object sender, EventArgs e)
//Event handler used for any number button click
{
if (buttons.Contains((Button)sender))
{
char[] buttonName = ((Button)sender).Name.ToCharArray();
int row = buttonName[1] - 48;
int column = buttonName[3] - 48;
//This line is to make conditional statement more clear
SudokuNumber buttonNumber = game.entries[Sudoku.CurrentEntry(row, column)];
if (!buttonNumber.correct & lastButton == ((Button)sender))
{
int?newValue = game.Increment(row, column);
((Button)sender).Text = Convert.ToString(newValue);
}
lastButton = ((Button)sender);
}
}
