public static int[,] GenerateRotatingWalkMatrix(int n)
{
if (n < 1 || n > 100)
{
throw new ArgumentOutOfRangeException(
"The size of the matrix should be positive integer number " +
"in the range [1..100]!");
}
int[,] outputMatrix = new int[n, n];
int number = 1;
Point currentCell = new Point() { Row = 0, Col = 0 };
Direction currentDir = new Direction() { DirX = 1, DirY = 1 };
FillMatrixWhilePossible(n, outputMatrix, ref number, currentCell, ref currentDir);
number++;
currentCell = GetFirstEmptyCell(outputMatrix);
if (currentCell != null)
{
currentDir.DirX = 1;
currentDir.DirY = 1;
FillMatrixWhilePossible(n, outputMatrix, ref number, currentCell, ref currentDir);
}
return outputMatrix;
}
static Direction GetNextDirection(Direction currentDirection)
{
int[] dirX = { 1, 1, 1, 0, -1, -1, -1, 0 };
int[] dirY = { 1, 0, -1, -1, -1, 0, 1, 1 };
for (int i = 0; i < dirX.Length; i++)
{
if (dirX[i] == currentDirection.DirX && dirY[i] == currentDirection.DirY)
{
Direction nextDirection = new Direction()
{
DirX = dirX[(i + 1) % dirX.Length],
DirY = dirY[(i + 1) % dirX.Length]
};
return nextDirection;
}
}
throw new InvalidOperationException(
String.Format(
"Could not find the next direction: dirX={0}, dirY={1}",
currentDirection.DirX,
currentDirection.DirY));
}
private static void FillMatrixWhilePossible(int n, int[,] outputMatrix, ref int number, Point currentCell, ref Direction currentDir)
{
while (true) //malko e kofti tova uslovie, no break-a raboti 100% :)
{
outputMatrix[currentCell.Row, currentCell.Col] = number;
if (!CheckDirections(outputMatrix, currentCell.Row, currentCell.Col))
{
break; // prekusvame ako sme se zadunili
}
while (IsNextCellAvailable(n, outputMatrix, currentCell, currentDir))
{
currentDir = GetNextDirection(currentDir);
}
currentCell.Row += currentDir.DirX;
currentCell.Col += currentDir.DirY;
number++;
}
}
private static bool IsNextCellAvailable(
int n, int[,] matrix, Point cell, Direction dir)
{
return cell.Row + dir.DirX >= n || cell.Row + dir.DirX < 0 ||
cell.Col + dir.DirY >= n || cell.Col + dir.DirY < 0 ||
matrix[cell.Row + dir.DirX, cell.Col + dir.DirY] != 0;
}