For example I got a picture position in 10,10 with width of 100 and height of 120. I centre rotated it clock-wise 20 degree, the position will be smaller and size will be bigger since the edge will be coming out, but how would I calculate the value for them?
No sure I made the question clear enough, will change it if I find a better way to explain it.
Trying to do this in Android
I assume that you want to know how the bounding box of an object is transformed if you rotate it around its center.
If the original box has width w and height h, the new one, after rotation by r, has dimensions:
wr = abs(sin(r)) * h + abs(cos(r)) * w
hr = abs(sin(r)) * w + abs(cos(r)) * h