Circular loop through 2D array

[Baldi]

While I'm worried this is above me, for reasons regarding depth I would like to loop through a 2D array starting at a given position and "spiraling" out from that point. The most helpful thing I found online was this https://stackoverflow.com/questions/398299/looping-in-a-spiral?rq=1, however it is in python and I am not able to understand it. If someone could help me with this I would appreciate it alot!

 

[FrostyCat]

You could have scrolled a little further down and found the C++ answer, which is basically copy-and-paste except for minor syntax adjustments.

var X = array_length_2d(arr, 0),
    Y = array_height_2d(arr),
    xx = 0,
    yy = 0,
    dx = 0,
    dy = -1;
repeat (sqr(max(X, Y))) {
    if ((-X/2 <= xx) && (xx <= X/2) && (-Y/2 <= yy) && (yy <= Y/2)) {
        // DO STUFF...
    }
    if ((xx == yy) || ((xx < 0) && (xx == -yy)) || ((xx > 0) && (xx == 1-yy))) {
        var t = dx;
        dx = -dy;
        dy = t;
    }
    xx += dx;
    yy += dy;
}