[Swarm-Support] Discrete2d peculiar behavior

[Alex Olivas]

I found the problem so my last post can be neglected.
It turns out the problem was getting objects near the boundaries
(i.e. negative values for x and/or y).  My code lookes like...


 int deltaX,deltaY;
 for(deltaX=-1;deltaX<=1;deltaX++)
   for(deltaY=-1;deltaY<=1;deltaY++)
     if((deltaX!=0)||(deltaY!=0))
   if([world getObjectAtX: xPos+deltaX Y: yPos+deltaY]!= nil){
     printf("x: %d y: %d\n",xPos+deltaX,yPos+deltaY);
     xprint([world getObjectAtX: xPos+deltaX Y: yPos+deltaY]);

My code would crash at the last line above (the xprint statement).
I was wondering if x=-1 (for example) why does [world getObjectAtX: 
xPos+deltaX Y: yPos+deltaY]
return a non-nil value?

This is a hack of heatbugs, so world is a Grid2d object and the space 
contains modified heatbugs.
Thanks,
Alex.