AutoCAD .NET :: Access Hatch Angle And Origins

I'm a vb.net developer and i've a project to do for my job (my company is building laser machines). So i have to use autocad for drawing and, inside autocad, add a vb.net project to transfer all coordinates to a laser.

There's no problem for the most of object, but i've some difficulties with the hatch. I explain.

I can get the coordinates for hatching with the " . explose " (it gave me lines and after that, i can have all the points x and y)

But i need to "Rotate the hatch" (for making some sorts of holes in metal by example)

(Ex : Hatch angle start at 0 degrees, then 45, then 90, etc... etc...)

How can i rotate this hatch in vb.net ? (The hatch must not change on the autocad screen, so i use a clone for getting lines). I've find a method for getting the pattern angle (ex : MyHatch.patternAngle) but it returns me strange angle (like 0,00812 etc...)

And a other problem is that the origins of hatch angle seems based on 0,0 (so, when i change angle, it change from 0,0 and not the center of the Hatch)