Depth Checking Cursor

// STEP EVENT
// target initialized in the Create Event

//Note that I have conversions from gui layer to in-room, but as I know that is all functioning,
//I omitted it from here. To simplify just assume cx and cy are the mouse position relative to
//what layer it is interracting with

//ds_list creation
var _list = ds_list_create();

//fill ds_list with all objects at this position
var _fill = instance_position_list(cx, cy, all, _list, false);


//If there is more than 1 object (since cursor is 1 object always seen)
if (_fill > 1)
{
  //Loop through the list
  for (var i = 0; i < _fill; ++i;)
  {
    if instance_exists(_list[| i]) //If the instance in the list still exists
    {    //and is not "uninteractable" like a camera, or the cursor itself
      if (_list[| i]) != id && !object_is_ancestor(_list[| i].object_index,par_oob)
      {
        if target != noone //If I was over something
        {
          if instance_exists(target) //and it still exists
          {
            if target.depth > _list[| i].depth //and it's deeper than my new target
            {
              target = _list[| i];//Make the less deep object my target
            }
          }
        }
        if target == noone //If I wasn't over something to begin with
        {
          target = _list[| i]; //Make the hovered object the target
        }
        //show_debug_message(_list[| i].id);
      }
    }
  }
}
else { target = noone; } //If it is just the cursor being seen, target noone

//If my target does not exist within the list of objects I am touching, target noone
if ds_list_find_index(_list,target) == -1 { target = noone; }

ds_list_destroy(_list);//Cleanup

//show_debug_message("target: " + string(target));