Spiral traversal of matrix in golang

Go program for Spiral traversal of matrix. Here more information.

package main
import "fmt"
// Go program
// Spiral form of 2d array

func spiral(data[][] int, startRow int, 
    startCol int, endRow int, endCol int, element int) {
    //Left to right
    for i := startCol ; i <= endCol && element > 0 ; i++ {
        element--
        fmt.Print("  ", data[startRow][i])
    }
    //Top to down
    for i := startRow + 1 ; i <= endRow && element > 0 ; i++ {
        element--
        fmt.Print("  ", data[i][endCol])
    }
    //Bottom right to bottom-left
    for i := endCol - 1 ; i >= startCol && element > 0 ; i-- {
        element--
        fmt.Print("  ", data[endRow][i])
    }
    // Bottom left to top
    for i := endRow - 1 ; i > startRow && element > 0 ; i-- {
        element--
        fmt.Print("  ", data[i][startRow])
    }
    if startRow + 1 <= endRow - 1 && element > 0 {
        // Recursive call
        spiral(data, startRow + 1, startCol + 1, 
        	endRow - 1, endCol - 1, element)
    }
}
func main() {

    // 2d matrix
    var matrix = [][] int {
      {1 ,  2 ,  3 ,  4 ,  5 ,  6} , 
      {22 , 23 , 24 , 25 , 26 , 7} , 
      {21 , 36 , 37 , 38 , 27 , 8} , 
      {20 , 35 , 42 , 39 , 28 , 9} , 
      {19 , 34 , 41 , 40 , 29 , 10} , 
      {18 , 33 , 32 , 31 , 30 , 11} , 
      {17 , 16 , 15 , 14 , 13 , 12}}
    var row int = len(matrix)
    var col int = len(matrix[0])
    // Get the number of element
    var element int = row * col
    spiral(matrix, 0, 0, row - 1, col - 1, element)
}

Output

  1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42