private bool Move(Position startPosition, out Position position)
{
var length = this.possibleDirections.Length;
for (int i = 0; i < length; i++)
{
var possibleDirection = this.possibleDirections[this.currentDirection];
var row = startPosition.Y + possibleDirection.Y;
var column = startPosition.X + possibleDirection.X;
if (this.matrix.IsValidCoordinate(row, column) && this.matrix[row, column] == 0)
{
position = new Position(column, row);
return true;
}
this.currentDirection++;
if (this.currentDirection == length)
{
this.currentDirection = 0;
}
}
position = default(Position);
return false;
}
public void FirstOrDefaultZeroCellWithNotSetMatrix()
{
var matrix = new Matrix(3);
var expected = new Position(0, 0);
var actual = matrix.FirstOrDefaultZeroCell();
Assert.AreEqual(expected.X, actual.X);
Assert.AreEqual(expected.Y, actual.Y);
}
public void Start()
{
this.matrix = new Matrix(this.Size);
Position currentPosition = new Position(0, 0);
int cellValue = 0;
do
{
this.currentDirection = 0;
do
{
this.matrix[currentPosition.Y, currentPosition.X] = ++cellValue;
}
while (this.Move(currentPosition, out currentPosition));
currentPosition = this.matrix.FirstOrDefaultZeroCell();
}
while (currentPosition != null);
}