Anticlockwise spiral view of diamond matrix elements in ruby

Ruby program for Anticlockwise spiral view of diamond matrix elements. Here mentioned other language solution.

#  Ruby 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
	def spiralView(matrix, x, y, p, q, k) 
		#  Find the middle column
		midCol = y + ((q - y) / 2)
		#  Get middle row (valid for odd square matrix)
		midRow = midCol
		#  Matrix are divided into 4 section
		#  Starting of middle row and column in form of top
		#  Case A
		#  Top to Left-bottom
		i = midCol
		j = 0
		while (i > y && k > 0) 
			print("  ", matrix[x + j][i])
			i -= 1
			k -= 1
			j += 1
		end

		#  Case B
		#  Middle left to middle right bottom
		i = y
		j = 0
		while (i <= midCol && k > 0) 
			print("  ", matrix[(midRow) + j][i])
			i += 1
			k -= 1
			j += 1
		end

		#  Case C
		#  Middle bottom to middle right side 
		i = midCol + 1
		j = 1
		while (i <= q && k > 0) 
			print("  ", matrix[(p) - j][i])
			i += 1
			k -= 1
			j += 1
		end

		#  Case D
		#  Middle right side to  top middle 
		i = q - 1
		j = 1
		while (i > midCol && k > 0) 
			print("  ", matrix[(midRow) - j][i])
			i -= 1
			k -= 1
			j += 1
		end

		if (x + 1 <= p - 1 && k > 0) 
			#  Recursive call
			self.spiralView(matrix, x + 1, y + 1, p - 1, q - 1, k)
		end

	end

	def diamondAnticlockwise(matrix) 
		row = matrix.length
		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
			print("\nNot a valid perfect Odd square matrix\n")
			return
		end

		#  (row*col)-((col+1)/2)*4 are provide the value of number of 
		#  Diamond element
		self.spiralView(matrix, 0, 0, row - 1, 
                        col - 1, (row * col) - ((col + 1) / 2) * 4)
	end

end

def main() 
	task = SpiralTraversal.new()
	#  Define matrix 
	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)
end

main()

Output

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