EdgePositions ( Ytop, Ybottom, Xleft, Xright )

[King_Cool]

Hi
Where are the edges of active objects located, i asked myself?

I made an example to see where they were located. From the example i learned that the edges are located where they should imo ( last pixle at the top, bootom, left and right of object ) but with an offest of x+1 and y+1
( I have attached my example to this post )

Should the edges of object be located at theese positions? What is the meaning of this? It seem wrong imo