Thread: Help with a line of my code.

I am using this code to start a class ZigZagBug in a "game"
known as GridWorld. We use this in our Programming class right now.

Anyway, my code does what it is supposed to do, I know what the lines do, but
how can I describe them with comments?

Here is the code.

import info.gridworld.actor.Bug;
 
public class ZigZagBug extends Bug {
    int counter = 1;
 
    public ZigZagBug(){
        turn();
    }
 
    public void act(){
        if(canMove()){
            //This gets the adjacent location, of the direction that the bug is facing.
            //IE - Faces Right-North, the next location is the location directly in front of what the bug faces.
            moveTo(getLocation().getAdjacentLocation(getDirection()));
            setDirection(getDirection() + 90 + ((counter++)%2 * 180));
        }else{
            //If the bug cannot move, it turns 180 degrees and then moves again.
            setDirection(getDirection() + 180);
        }
    }
}

Now, what is..

This for?

int counter = 1;

And this for?

setDirection(getDirection() + 90 + ((counter++)%2 * 180));