Smartmobili.Cocoa.NSView.RotateByAngle C# (CSharp) Method

        public void RotateByAngle(double angle)
        {
            if (angle != 0.0)
            {
                NSAffineTransform matrix;
                NSRect frame = _frame;

                frame.Origin = NS.MakePoint(0, 0);
                if (_boundsMatrix == null)
                {
                    _boundsMatrix = (NSAffineTransform)NSAffineTransform.Alloc().Init();
                }
                _boundsMatrix.RotateByDegrees(angle);
                // Adjust bounds
                matrix = (NSAffineTransform)_boundsMatrix.Copy();
                matrix.Invert();
                matrix.BoundingRectFor(frame, ref _bounds);
                //RELEASE(matrix);

                _is_rotated_from_base = _is_rotated_or_scaled_from_base = true;

                if (_coordinates_valid)
                {
                    //FIXME
                    //(*invalidateImp)(self, invalidateSel);
                }
                this.ResetCursorRects();
                if (_post_bounds_changes)
                {
                    //[nc postNotificationName: NSViewBoundsDidChangeNotification object: self];
                }
            }
        }