Anticlockwise spiral view of diamond matrix elements in node js

Js program for Anticlockwise spiral view of diamond matrix elements. Here more solutions.

/*
  Node JS program for
  Anticlockwise spiral view of diamond element in matrix
*/
class SpiralTraversal
{
	// Method which is displaying the Anticlockwise spiral 
	// Of matrix in diamond(mid) element
	spiralView(matrix, x, y, p, q, k)
	{
		// Find the middle column
		var midCol = y + (parseInt((q - y) / 2));
		// Get middle row (valid for odd square matrix)
		var midRow = midCol;
		// Matrix are divided into 4 section
		// Starting of middle row and column in form of top
		// Case A
		// Top to Left-bottom
		var i = midCol;
		var j = 0;
		while (i > y && k > 0)
		{
			process.stdout.write("  " + matrix[x + j][i]);
			i--;
			k--;
			j++;
		}
		// Case B
		// Middle left to middle right bottom
		i = y;
		j = 0;
		while (i <= midCol && k > 0)
		{
			process.stdout.write("  " + matrix[(midRow) + j][i]);
			i++;
			k--;
			j++;
		}
		// Case C
		// Middle bottom to middle right side 
		i = midCol + 1;
		j = 1;
		while (i <= q && k > 0)
		{
			process.stdout.write("  " + matrix[(p) - j][i]);
			i++;
			k--;
			j++;
		}
		// Case D
		// Middle right side to  top middle 
		i = q - 1;
		j = 1;
		while (i > midCol && k > 0)
		{
			process.stdout.write("  " + matrix[(midRow) - j][i]);
			i--;
			k--;
			j++;
		}
		if (x + 1 <= p - 1 && k > 0)
		{
			// Recursive call
			this.spiralView(matrix, x + 1, y + 1, p - 1, q - 1, k);
		}
	}
	diamondAnticlockwise(matrix)
	{
		var row = matrix.length;
		var col = matrix[0].length;
		// Check whether the given matrix is a valid odd shape or not
		if (row != col || col % 2 == 0)
		{
			// When Yes not a valid size
			console.log("\nNot a valid perfect Odd square matrix");
			return;
		}
		// (row*col)-((col+1)/2)*4 are provide the value of number of 
		// Diamond element
		this.spiralView(matrix, 0, 0, 
              row - 1, col - 1, 
             (row * col) - (parseInt((col + 1) / 2)) * 4);
	}
}

function main()
{
	var task = new SpiralTraversal();
	// Define matrix 
	var matrix = [
		[1, 2, 3, 4, 5],
		[6, 7, 8, 9, 10],
		[11, 12, -1, 15, 16],
		[17, 18, 19, 20, 21],
		[22, 23, 24, 25, 26]
	];
	task.diamondAnticlockwise(matrix);
}
// Start program execution
main();

Output

  3  7  11  18  24  20  16  9  8  12  19  15  -1