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Anticlockwise spiral view of diamond matrix elements in swift

Anticlockwise spiral view of matrix

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

import Foundation
/*
  Swift 4 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
	func spiralView(_ matrix: [[Int]], 
      _ x: Int, _ y: Int, _ p: Int, _ q: Int, _ size: Int)
	{
      	var k: Int = size;
		// Find the middle column
		let midCol: Int = y + ((q - y) / 2);
		// Get middle row (valid for odd square matrix)
		let midRow: Int = 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: Int = midCol;
		var j: Int = 0;
		while (i > y && k > 0)
		{
			print(matrix[x + j][i], terminator: "  ");
			i -= 1;
			k -= 1;
			j += 1;
		}
		// Case B
		// Middle left to middle right bottom
		i = y;
		j = 0;
		while (i <= midCol && k > 0)
		{
			print(matrix[(midRow) + j][i], terminator: "  ");
			i += 1;
			k -= 1;
			j += 1;
		}
		// Case C
		// Middle bottom to middle right side 
		i = midCol + 1;
		j = 1;
		while (i <= q && k > 0)
		{
			print(matrix[(p) - j][i], terminator: "  ");
			i += 1;
			k -= 1;
			j += 1;
		}
		// Case D
		// Middle right side to  top middle 
		i = q - 1;
		j = 1;
		while (i > midCol && k > 0)
		{
			print(matrix[(midRow) - j][i], terminator: "  ");
			i -= 1;
			k -= 1;
			j += 1;
		}
		if (x + 1 <= p - 1 && k > 0)
		{
			// Recursive call
			self.spiralView(matrix, x + 1, y + 1, p - 1, q - 1, k);
		}
	}
	func diamondAnticlockwise(_ matrix:[[Int]])
	{
		let row: Int = matrix.count;
		let col: Int = matrix[0].count;
		// 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");
			return;
		}
		// (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);
	}
	static func main()
	{
		let task: SpiralTraversal = SpiralTraversal();
		// Define matrix 
		let matrix: [
			[Int]
		] = [
			[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);
	}
}
SpiralTraversal.main();

Output

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




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