public Matrix(int size, int[,] matrix = null)
{
if (size <= 0)
{
throw new ArgumentOutOfRangeException(
"size", "Size should be a positive number");
}
this.size = size;
if (matrix == null)
{
this.data = new int[size, size];
}
else
{
bool isMatrixEmpty = matrix.GetLength(0) == 0 ||
matrix.GetLength(1) == 0;
if (isMatrixEmpty)
{
throw new ArgumentException("Matrix is empty", "data");
}
this.data = matrix;
}
this.step = size;
this.currentNumber = 1;
this.previousCell = new Cell(0, 0);
this.nextCell = new Cell(1, 1);
}
private static void FillMatrix(int[,] matrix, Cell startCell)
{
var currentCell = startCell;
int direction = (int)Directions.DownRight;
while (IsCellAvailable(matrix, currentCell))
{
matrix[currentCell.X, currentCell.Y] = currentCell.CellValue;
while (!IsNextCellAvailable(matrix, currentCell, direction) &&
HasPossibleWalk(matrix, currentCell, direction))
{
direction = (direction + 1) % DirectionsCount;
}
currentCell.X += DirX[direction];
currentCell.Y += DirY[direction];
currentCell.CellValue++;
}
var nextStartCell = FindFirstEmptyCell(matrix);
if (nextStartCell != null)
{
nextStartCell.CellValue = currentCell.CellValue;
FillMatrix(matrix, nextStartCell);
}
}
public void TestNotEqualOperator()
{
Cell a = new Cell(4, 5);
Cell b = new Cell(4, 6);
Assert.IsTrue(a != b);
}
public void TestAdditionOperator()
{
Cell a = new Cell(4, 5);
Cell b = new Cell(4, 6);
Cell result = a + b;
Assert.AreEqual(new Cell(8, 11), result);
}
public void TestCellConstructor()
{
int x = 2;
int y = 3;
Cell cell = new Cell(x, y);
Assert.AreEqual(x, cell.X);
Assert.AreEqual(y, cell.Y);
}
private void FillMatrix()
{
var currentCell = new Cell(0, 0);
var currentCellValue = 1;
while (currentCell != null)
{
this.Field[currentCell.X, currentCell.Y] = currentCellValue;
currentCell = this.Move(currentCell) ?? this.FindFirstEmptyCell();
currentCellValue++;
}
}
private void FillMatrix()
{
var currentCell = new Cell(0, 0);
var currentCellValue = 1;
while (currentCell != null)
{
this.Field[currentCell.Row, currentCell.Col] = currentCellValue;
currentCell = this.GetNextCell(currentCell) ?? this.FindFirstPossibleCell();
currentCellValue++;
}
}
private Cell Move(Cell cell)
{
for (int i = this.currentTargetCellIndex; i < this.targetCells.Length + this.currentTargetCellIndex; i++)
{
Cell nextCell = cell + this.targetCells[i % this.targetCells.Length];
if (this.IsValidDestination(nextCell))
{
this.currentTargetCellIndex = i % this.targetCells.Length;
return nextCell;
}
}
return null;
}
private static bool HasPossibleWalk(int[,] matrix, Cell currentCell, int direction)
{
for (int i = 0; i < DirectionsCount; i++)
{
direction = (direction + 1) % DirectionsCount;
if (IsNextCellAvailable(matrix, currentCell, direction))
{
return true;
}
}
return false;
}
private Cell GetNextCell(Cell cell)
{
for (int ind = this.cellIndex; ind < this.target.Length + this.cellIndex; ind++)
{
Cell nextCell = cell + this.target[ind % this.target.Length];
if (this.IsValidDestination(nextCell))
{
this.cellIndex = ind % this.target.Length;
return nextCell;
}
}
return null;
}
private static Cell FindFirstEmptyCell(int[,] matrix)
{
for (int row = 0; row < matrix.GetLength(0); row++)
{
for (int col = 0; col < matrix.GetLength(1); col++)
{
if (matrix[row, col] == 0)
{
Cell firstEmptyCell = new Cell(row, col);
return firstEmptyCell;
}
}
}
return null;
}
private void FillMatrix()
{
var currentCell = new Cell(0, 0);
var currentCellValue = 1;
while (currentCellValue <= this.size * this.size)
{
this.Field[currentCell.X, currentCell.Y] = currentCellValue;
currentCell = this.Move(currentCell) ?? this.MoveToFirstEmptyCell();
//if (currentCell == null)
//{
// currentCell = this.FindFirstEmptyCell();
//}
currentCellValue++;
}
}
private Cell FindFirstEmptyCell()
{
Cell result = new Cell(0, 0);
for (int row = 0; row < this.Field.GetLength(0); row++)
{
for (int column = 0; column < this.Field.GetLength(0); column++)
{
if (this.Field[row, column] == 0)
{
this.currentTargetCellIndex = 0;
result.X = row;
result.Y = column;
return result;
}
}
}
return null;
}
private Cell FindFirstPossibleCell()
{
Cell possibleCell = new Cell(0, 0);
for (int row = 0; row < this.Field.GetLength(0); row++)
{
for (int col = 0; col < this.Field.GetLength(0); col++)
{
if (this.Field[row, col] == 0)
{
this.cellIndex = 0;
possibleCell.Row = row;
possibleCell.Col = col;
return possibleCell;
}
}
}
return null;
}
private Cell FindFirstEmptyCell()
{
Cell result = new Cell(0, 0);
for (int i = 0; i < this.Field.GetLength(0); i++)
{
for (int j = 0; j < this.Field.GetLength(0); j++)
{
if (this.Field[i, j] == 0)
{
this.currentTargetCellIndex = 0;
result.X = i;
result.Y = j;
return result;
}
}
}
return null;
}
private bool AreAddedCellsInRange(Cell previousCell, Cell nextCell)
{
Cell result = previousCell + nextCell;
bool isCellOutOfRange = result.X >= size || result.X < 0 ||
result.Y >= size || result.Y < 0;
return isCellOutOfRange || data[result.X, result.Y] != 0;
}
bool AreThereFreeNeighbours(Cell cell)
{
Cell[] directions = new Cell[]
{
new Cell(1, 1),
new Cell(1, 0),
new Cell(1, -1),
new Cell(0, -1),
new Cell(-1, -1),
new Cell(-1, 0),
new Cell(-1, 1),
new Cell(0, 1)
};
for (int i = 0; i < DIRECTION_COUNT; i++)
{
directions[i] = CalculateCellCoordinates(cell, directions[i]);
bool isCellFree = this.data[cell.X + directions[i].X,
cell.Y + directions[i].Y] == 0;
if (isCellFree)
{
return true;
}
}
return false;
}
private static bool IsNextCellAvailable(int[,] matrix, Cell currentCell, int direction)
{
var nextX = currentCell.X + DirX[direction];
var nextY = currentCell.Y + DirY[direction];
var nextCell = new Cell(nextX, nextY);
return IsCellAvailable(matrix, nextCell);
}
private bool IsValidDestination(Cell cellToCheck)
{
return cellToCheck.X >= 0 && cellToCheck.X < this.Field.GetLength(0) && cellToCheck.Y >= 0
&& cellToCheck.Y < this.Field.GetLength(0) && this.Field[cellToCheck.X, cellToCheck.Y] == 0;
}
private Cell CalculateCellCoordinates(Cell cell, Cell direction)
{
Cell result = cell + direction;
bool isXOutOfRange = result.X >= this.data.GetLength(0) ||
result.X < 0;
if (isXOutOfRange)
{
direction.X = 0;
}
bool isYOutOfRange = result.Y >= this.data.GetLength(0) ||
result.Y < 0;
if (isYOutOfRange)
{
direction.Y = 0;
}
return direction;
}
public void WalkInMatrix()
{
PerformLongestWalk();
this.previousCell = FindNextFreeCell();
if (this.previousCell != new Cell(0, 0))
{
this.currentNumber++;
this.nextCell = new Cell(1, 1);
PerformLongestWalk();
}
}
private bool IsValidDestination(Cell cell)
{
return cell.X >= 0 && cell.X < this.size &&
cell.Y >= 0 && cell.Y < this.size &&
this.Field[cell.X, cell.Y] == 0;
}
Cell FindNextFreeCell()
{
Cell cell = new Cell(0, 0);
for (int i = 0; i < this.data.GetLength(0); i++)
{
for (int j = 0; j < this.data.GetLength(0); j++)
{
if (this.data[i, j] == 0)
{
return new Cell(i, j);
}
}
}
return cell;
}
private Cell MoveToFirstEmptyCell()
{
Cell result = new Cell(0, 0);
for (int i = 0; i < this.size; i++)
{
for (int j = 0; j < this.size; j++)
{
if (this.Field[i, j] == 0)
{
currentDirectionIndex = 0;
result.X = i;
result.Y = j;
return result;
}
}
}
return null;
}
private bool IsValidDestination(Cell cell)
{
var isValidRow = cell.Row >= 0 && cell.Row < this.Field.GetLength(0);
var isValidCol = cell.Col >= 0 && cell.Col < this.Field.GetLength(1);
var isValidDestination = isValidCol && isValidRow;
if (isValidDestination)
{
isValidDestination = this.Field[cell.Row, cell.Col] == 0;
}
return isValidDestination;
}
private void PerformLongestWalk()
{
while (true)
{
data[previousCell.X, previousCell.Y] = currentNumber;
if (!AreThereFreeNeighbours(previousCell))
{
break;
}
if (AreAddedCellsInRange(previousCell, nextCell))
{
while (AreAddedCellsInRange(previousCell, nextCell))
{
MoveCellInDirection(ref nextCell);
}
}
previousCell += nextCell;
currentNumber++;
}
}
public void TestEmptyCellConstructor()
{
Cell cell = new Cell();
Assert.AreEqual(0, cell.X);
Assert.AreEqual(0, cell.Y);
}
private Cell Move(Cell cell)
{
for (int i = this.currentDirectionIndex; i < this.currentDirectionIndex + numberOfDirections; i++)
{
var nextCell = cell + this.directions[i % numberOfDirections];
if (this.IsValidDestination(nextCell))
{
this.currentDirectionIndex = i % numberOfDirections;
return nextCell;
}
}
return null;
}
private static bool IsCellAvailable(int[,] matrix, Cell currentCell)
{
bool isCellAvailable = currentCell.X >= 0 && currentCell.X < matrix.GetLength(0) &&
currentCell.Y >= 0 && currentCell.Y < matrix.GetLength(1) &&
matrix[currentCell.X, currentCell.Y] == 0;
return isCellAvailable;
}
static void MoveCellInDirection(ref Cell cell)
{
Cell[] directions = new Cell[]
{
new Cell(1, 1),
new Cell(1, 0),
new Cell(1, -1),
new Cell(0, -1),
new Cell(-1, -1),
new Cell(-1, 0),
new Cell(-1, 1),
new Cell(0, 1)
};
int cellCount = 0;
for (int i = 0; i < DIRECTION_COUNT; i++)
{
if (directions[i].X == cell.X && directions[i].Y == cell.Y)
{
cellCount = i;
break;
}
}
if (cellCount == 7)
{
cell = directions[0];
return;
}
cell = directions[cellCount + 1];
}