How do I find out if there is an object in a position?

I am making a sort of "Dont Starve" game and I'm having trouble finding an object in a position.

I want to do this because I want to adjust a "wall" sprite's image with its corresponding position.

e.g.

A B C

D E F

G H I

In the above, the A position should be a south-east (r) shaped wall.

The B position should be a south-east-west (T) shaped wall.

The E position should be a north-south-east-west (+) shaped wall.

and etc . . .

I made all the versions of the wall as an animation so I just change the animation of an object to change the shape.

The problem is, I can't find a way to find out if there are existing wall objects in the North, South, East, and West position of a newly placed wall.

I need to find out if there are other walls so that I can set the new wall and the existing surrounding walls to the proper shape.

Any tips?

Use overlapping test; 'is overlapping at offset' So you can check whether there is overlapping object at that offset position.

'Is Overlapping at Offset' can be a real pain.

Why and more about auto tiling is discussed here;

Thanks guys! I'll try to get something to work with your tips.

Ah adaptive sprite/tile aka bitwise operation:

I modified R0J0 example, make it compact & intuitive (and touch friendly) bitwise_mod.capx