translation.y = screenFrame.origin.y + ([_window frame].size.height / 2.0);
transform = CGAffineTransformMakeTranslation(translation.x, translation.y);
transform = CGAffineTransformRotate(transform, radAngle);
translation.y = screenFrame.origin.y + ([_window frame].size.height / 2.0);
transform = CGAffineTransformMakeTranslation(translation.x, translation.y);
transform = CGAffineTransformRotate(transform, radAngle);