Enemy Follow Player Orthogonal Movement

Question

I have a Enemy class that Seeks a player if he is in his field of view. Problem is i want the enemy only to move up/down/right/left, not like for example up and left at the same time (diagonal movement).

EDIT: Code updated

    private void SeekPlayer(GameTime gameTime, Player player)
    {
        directionToPlayer = player.Image.Position - Image.Position;
        directionToPlayer.Normalize();

        if(Image.Position != player.Image.Position)
        {
            if (directionToPlayer.X != player.Image.Position.X)
            {
                if(directionToPlayer.X < player.Image.Position.X)
                    Image.Position.X += directionToPlayer.X * MoveSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds;
                else
                    Image.Position.X -= directionToPlayer.X * MoveSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds;
            }
            else if (directionToPlayer.Y != player.Image.Position.Y)
            {
                if (directionToPlayer.Y < player.Image.Position.Y)
                    Image.Position.Y += directionToPlayer.Y * MoveSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds;
                else
                    Image.Position.Y -= directionToPlayer.Y * MoveSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds;
            }

        }
        UpdateFOV();
    }

With the current code the enemy sometimes follows the play on the X coordinates, and when it's the same has the player's, doesn't continue to follow on the Y coordinate. And vice-versa for Y.

Answer 1

Your code has some serious issues. First of all, in games, you generally don't want to be moving objects on the screen by a flat amount per frame, because then the frame rate can make you go faster or slower, which is not a good thing. The way you want to be moving your objects is with delta time, which is the elapsed time between this and the previous Update() call.

As far as 'moving to target location' goes, you will need something better than a magical hard-coded number 0.1f. Check out this question, on how to move an object from one point to another, in XNA/Monogame.

Looking at your code, I don't see any reason for your directionToPlayer and Velocity variables to not be declared inside your SeekPlayer() function, so I declared them there. Also, you have the exact same code in an if-else statement. There is no point on doing that, since it is going to get called either way. So you might as well call it after the if-else statement. And finally, there is no point in using return; as the final command of a void function. It is going to return anyway.

float speed = 2;
Vector2 velocity = player.Image.Position - Image.Position;
velocity.Normalize();

if(velocity.X > 0.1f) // still not close enough on X-axis
    Image.Position.X += speed; // move on X-axis
else if(velocity.Y > 0.1f) // still not close enough on Y-axis
    Image.Position.Y += speed;  // move on Y-axis
UpdateFOV();