# 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()
{
// 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]
];
}
// Start program execution
main();``````

Output

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

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