public void AddLegend(Graphics g, DataCollection dc, ChartStyle cs)
        {
            if (dc.DataSeriesList.Count < 1)
            {
                return;
            }
            if (!IsLegendVisible)
            {
                return;
            }
            int numberOfDataSeries = dc.DataSeriesList.Count;
            string[] legendLabels = new string[dc.DataSeriesList.Count];
            int n = 0;
            foreach (DataSeries ds in dc.DataSeriesList)
            {
                legendLabels[n] = ds.SeriesName;
                n++;
            }
            float offSet = 10;
            float xc = 0f;
            float yc = 0f;
            SizeF size = g.MeasureString(legendLabels[0], LegendFont);
            float legendWidth = size.Width;
            for (int i = 0; i < legendLabels.Length; i++)
            {
                size = g.MeasureString(legendLabels[i], LegendFont);
                float tempWidth = size.Width;
                if (legendWidth < tempWidth)
                    legendWidth = tempWidth;
            }
            legendWidth = legendWidth + 50.0f;
            float hWidth = legendWidth / 2;
            float legendHeight = 18.0f * numberOfDataSeries;
            float hHeight = legendHeight / 2;

            switch (LegendPosition)
            {
                case LegendPositionEnum.East:
                    xc = cs.PlotArea.X + cs.PlotArea.Width - offSet - hWidth;
                    yc = cs.PlotArea.Y + cs.PlotArea.Height / 2;
                    break;
                case LegendPositionEnum.North:
                    xc = cs.PlotArea.X + cs.PlotArea.Width / 2;
                    yc = cs.PlotArea.Y + offSet + hHeight;
                    break;
                case LegendPositionEnum.NorthEast:
                    xc = cs.PlotArea.X + cs.PlotArea.Width - offSet - hWidth;
                    yc = cs.PlotArea.Y + offSet + hHeight;
                    break;
                case LegendPositionEnum.NorthWest:
                    xc = cs.PlotArea.X + offSet + hWidth;
                    yc = cs.PlotArea.Y + offSet + hHeight;
                    break;
                case LegendPositionEnum.South:
                    xc = cs.PlotArea.X + cs.PlotArea.Width / 2;
                    yc = cs.PlotArea.Y + cs.PlotArea.Height - offSet - hHeight;
                    break;
                case LegendPositionEnum.SouthEast:
                    xc = cs.PlotArea.X + cs.PlotArea.Width - offSet - hWidth;
                    yc = cs.PlotArea.Y + cs.PlotArea.Height - offSet - hHeight;
                    break;
                case LegendPositionEnum.SouthWest:
                    xc = cs.PlotArea.X + offSet + hWidth;
                    yc = cs.PlotArea.Y + cs.PlotArea.Height - offSet - hHeight;
                    break;
                case LegendPositionEnum.West:
                    xc = cs.PlotArea.X + offSet + hWidth;
                    yc = cs.PlotArea.Y + cs.PlotArea.Height / 2;
                    break;
            }
            DrawLegend(g, xc, yc, hWidth, hHeight, dc, cs);
        }
        private void DrawLegend(Graphics g, float xCenter, float yCenter, 
            float hWidth, float hHeight, DataCollection dc, ChartStyle cs)
        {
            float spacing = 8.0f;
            float textHeight = 8.0f;
            float htextHeight = textHeight / 2.0f;
            float lineLength = 30.0f;
            float hlineLength = lineLength / 2.0f;
            Rectangle legendRectangle;
            Pen aPen = new Pen(LegendBorderColor, 1f);
            SolidBrush aBrush = new SolidBrush(LegendBackColor);

            if (isLegendVisible)
            {
                legendRectangle = new Rectangle((int)xCenter - (int)hWidth,
                    (int)yCenter - (int)hHeight,
                    (int)(2.0f * hWidth), (int)(2.0f * hHeight));
                g.FillRectangle(aBrush, legendRectangle);
                if (IsBorderVisible)
                {
                    g.DrawRectangle(aPen, legendRectangle);
                }

                int n = 1;
                foreach (DataSeries ds in dc.DataSeriesList)
                {
                    // Draw lines and symbols:
                    float xSymbol = legendRectangle.X + spacing + hlineLength;
                    float xText = legendRectangle.X + 2 * spacing + lineLength;
                    float yText = legendRectangle.Y + n * spacing + (2 * n - 1) * htextHeight;
                    aPen = new Pen(ds.LineStyle.LineColor, ds.LineStyle.Thickness);
                    aPen.DashStyle = ds.LineStyle.Pattern;
                    PointF ptStart = new PointF(legendRectangle.X + spacing, yText);
                    PointF ptEnd = new PointF(legendRectangle.X + spacing + lineLength, yText);

                    g.DrawLine(aPen, ptStart, ptEnd);
                    //ds.SymbolStyle.DrawSymbol(g, new PointF(xSymbol, yText));
                    // Draw text:
                    StringFormat sFormat = new StringFormat();
                    sFormat.Alignment = StringAlignment.Near;
                    g.DrawString(ds.SeriesName, LegendFont, new SolidBrush(textColor),
                                 new PointF(xText, yText - 8), sFormat);
                    n++;
                }
            }
            aPen.Dispose();
            aBrush.Dispose();
        }
 // Shared initialization code
 void Initialize()
 {
     this.AutoresizingMask = NSViewResizingMask.HeightSizable | NSViewResizingMask.WidthSizable;
     BackColor = Color.Wheat;
     // Set Form1 size:
     //			this.Width = 350;
     //			this.Height = 300;
     dc = new DataCollection();
     cs = new ChartStyle(this);
     cs.XLimMin = 0f;
     cs.XLimMax = 6f;
     cs.YLimMin = -1.5f;
     cs.YLimMax = 1.5f;
     cs.XTick = 1f;
     cs.YTick = 0.5f;
     cs.TickFont = new Font("Arial", 10, FontStyle.Regular);
     cs.XLabel = "X Axis";
     cs.YLabel = "Y Axis";
     cs.LabelFont = new Font("Arial", 10, FontStyle.Regular | FontStyle.Underline);
     cs.Title = "Sine & Cosine Plot";
     cs.TitleFont = new Font("Arial", 12, FontStyle.Regular);
     lg = new Legend();
     lg.IsLegendVisible = true;
 }