Be.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((_recHex.Width - (_vScrollBarVisible ? _vScrollBar.Width : 0)) / (double)_charSize.Width);
                if (hmax > 1)
                {
                    if (_stringViewVisible)
                    {
                        SetHorizontalByteCount((int)Math.Floor((double)hmax / 4) );
                        _recHex.Width = (int)Math.Floor(((double)_iHexMaxHBytes) * _charSize.Width * 3 + (2 * _charSize.Width));
                    }
                    else
                    {
                        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(_recHex.Height / (double)_charSize.Height);
            SetVerticalByteCount(vmax);

            _iHexMaxBytes = _iHexMaxHBytes * _iHexMaxVBytes;

            UpdateScrollSize();
        }