// Call SolveGrid to solve puzzlegrid
//Store solved gamegrid as the correct solution in solutiongrid
public PuzzleGrid Blanker(PuzzleGrid solvedGrid)
{ //enable blanking of squares based on difficulty
PuzzleGrid tempGrid;
PuzzleGrid saveCopy;
//temporary grids to save between tests
bool unique = true; //flag for if blanked form has unique soln
int totalBlanks = 0; //count of current blanks
int tries = 0; //count of tries to blank appropriately
int desiredBlanks; //amount of blanks desired via difficulty
int symmetry = 0; //symmetry type
tempGrid = (PuzzleGrid)solvedGrid.Clone();
//cloned input grid (no damage)
Random rnd = new Random(); //allow for random number generation
switch (difficulty) //set desiredBlanks via chosen difficulty
{
case Difficulty.Easy: //easy difficulty
desiredBlanks = 40;
break;
case Difficulty.Medium: //medium difficulty
desiredBlanks = 45;
break;
case Difficulty.Hard: //hard difficulty
desiredBlanks = 50;
break;
default: //easy difficulty
desiredBlanks = 40;
break;
}
symmetry = rnd.Next(0, 2); //Randomly select symmetry
do
{ //call RandomlyBlank() to blank random squares symmetrically
saveCopy = (PuzzleGrid)tempGrid.Clone(); // in case undo needed
tempGrid = RandomlyBlank(tempGrid, symmetry, ref totalBlanks);
//blanks 1 or 2 squares according to symmetry chosen
puzzleSolver = new PuzzleSolver();
unique = puzzleSolver.SolveGrid((PuzzleGrid)tempGrid.Clone(), true); // will it solve uniquely?
if (!unique)
{
tempGrid = (PuzzleGrid)saveCopy.Clone();
tries++;
}
} while((totalBlanks < desiredBlanks) && (tries < 1000));
solvedGrid = tempGrid;
solvedGrid.Finish();
return(solvedGrid);
}
/// <summary>
/// Enters the puzzle entry state.
/// </summary>
private void LeavePuzzleEntryState()
{
// finish puzzle grid
puzzleGrid.Finish();
SetPuzzleGrid(puzzleGrid);
// hide buttons
SolveNow.Visibility = Visibility.Visible;
HintsBox.Visibility = Visibility.Visible;
HintsBoxTitle.Visibility = Visibility.Visible;
// show correct buttons
EntryComplete.Visibility = Visibility.Hidden;
inPuzzleEnterMode = false;
}