System.Windows.Forms.HexBox.UpdateRectanglePositioning C# (CSharp) Method

        void UpdateRectanglePositioning()
        {
            // calc char size
            SizeF charSize = this.CreateGraphics().MeasureString("A", Font, 100, _stringFormat);
            _charSize = new SizeF((float)Math.Ceiling(charSize.Width), (float)Math.Ceiling(charSize.Height));

            // calc content bounds
            _recContent = ClientRectangle;
            _recContent.X += _recBorderLeft;
            _recContent.Y += _recBorderTop;
            _recContent.Width -= _recBorderRight+_recBorderLeft;
            _recContent.Height -= _recBorderBottom+_recBorderTop;

            if(_vScrollBarVisible)
            {
                _recContent.Width -= _vScrollBar.Width;
                _vScrollBar.Left = _recContent.X+_recContent.Width;
                _vScrollBar.Top = _recContent.Y;
                _vScrollBar.Height = _recContent.Height;
            }

            int marginLeft = 4;

            // calc line info bounds
            if(_lineInfoVisible)
            {
                _recLineInfo = new Rectangle(_recContent.X+marginLeft,
                    _recContent.Y,
                    (int)(_charSize.Width*10),
                    _recContent.Height);
            }
            else
            {
                _recLineInfo = Rectangle.Empty;
                _recLineInfo.X = marginLeft;
            }

            // calc hex bounds and grid
            _recHex = new Rectangle(_recLineInfo.X + _recLineInfo.Width,
                _recLineInfo.Y,
                _recContent.Width - _recLineInfo.Width,
                _recContent.Height);

            if(UseFixedBytesPerLine)
            {
                SetHorizontalByteCount(_bytesPerLine);
                _recHex.Width = (int)Math.Floor(((double)_iHexMaxHBytes)*_charSize.Width*3+(2*_charSize.Width));
            }
            else
            {
                int hmax  = (int)Math.Floor((double)_recHex.Width/(double)_charSize.Width);
                if(hmax > 1)
                    SetHorizontalByteCount((int)Math.Floor((double)hmax/3));
                else
                    SetHorizontalByteCount(hmax);
            }

            if(_stringViewVisible)
            {
                _recStringView = new Rectangle(_recHex.X + _recHex.Width,
                    _recHex.Y,
                    (int)(_charSize.Width*_iHexMaxHBytes),
                    _recHex.Height);
            }
            else
            {
                _recStringView = Rectangle.Empty;
            }

            int vmax = (int)Math.Floor((double)_recHex.Height/(double)_charSize.Height);
            SetVerticalByteCount(vmax);

            _iHexMaxBytes = _iHexMaxHBytes * _iHexMaxVBytes;

            UpdateScrollSize();
        }