public bool IsSquareWithBorders(int[,] matrix, int row, int col, int size, SquareBorder bordervalue)
{
//Important: Formula for top, bottom, left and right
//check the top and bottom border of the square in the matrix for the given size starting at given row and colm
//for size = 5, j = 0, 1,2,3,4
//matrix is xero based index
// 00 01 02 03 04
// 10 11 12 13 14
// 20 21 22 23 24
// 30 31 32 33 34
// 40 41 42 43 44
//row and col will tell where to start the iteration
for (int j = 0; j < size; j++)
{
//check top border
if (matrix[row, col + j] != (int)bordervalue)
{
return(false);
}
//check bottom border
if (matrix[(size - 1) + row, col + j] != (int)bordervalue)
{
return(false);
}
}
//here k is from 1 to size -1 bcoz the top and bottom border already covered the first and last of left and right border
for (int k = 1; k < size - 1; k++)
{
//check left border
if (matrix[k + row, col] != (int)bordervalue)
{
return(false);
}
//check right border
if (matrix[k + row, (size - 1) + col] != (int)bordervalue)
{
return(false);
}
}
return(true);
}
//conver the matrix into squarecell [,] where squarecell[i,j] represents a cell and
//i has count of no of black cells consecutively (important) on the right
//j has count of no of black cells consecutively (important) on the bottom
public SquareCell[,] ProcessMatrixToSquareCells(int[,] matrix, SquareBorder bordervalue)
{
SquareCell[,] cells = new SquareCell[matrix.GetLength(0), matrix.GetLength(1)];
//loop through row from last to first ie bottom to top
for (int row = matrix.GetLength(0) - 1; row >= 0; row--)
{
//loop through col from last to first ie right to left
for (int col = matrix.GetLength(1) - 1; col >= 0; col--)
{
int rightcount = 0;
int bottomcount = 0;
//only process the count if the cell has the required border value
//If the cell doesn't have the required border value then reset the count as 0 bcoz we are looking for consecutive border value
if (matrix[row, col] == (int)bordervalue)
{
//increment the value if cell has the bordervalue
rightcount++;
bottomcount++;
//find the no of bordervalue on the right cell of the current cell
if (col + 1 < matrix.GetLength(1))
{
SquareCell previouscell = cells[row, col + 1];
rightcount += previouscell.RightCount;
}
//find the no of bordevalue on the bottom cell of the current cell
if (row + 1 < matrix.GetLength(0))
{
SquareCell bottomcell = cells[row + 1, col];
bottomcount += bottomcell.BottomCount;
}
}
cells[row, col] = new SquareCell(rightcount, bottomcount);
}
}
return(cells);
}