Steema Central

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  public Form1()
        {
            InitializeComponent();
            InitializeChart();
        }
        private Steema.TeeChart.Styles.FastLine series1, series2,series3;
        int HandleSize = 5;
        Color oldBrushColor;
        Color oldPenColor;
        bool oldGradient;
        private void InitializeChart()
        {
            tChart1.Aspect.View3D = false;
            series1 = new Steema.TeeChart.Styles.FastLine(tChart1.Chart);
            series2 = new Steema.TeeChart.Styles.FastLine(tChart1.Chart);
            series3 = new Steema.TeeChart.Styles.FastLine(tChart1.Chart);
            series1.FillSampleValues();
            series2.FillSampleValues();
            series3.FillSampleValues();
            series1.Color= Color.Blue;
            series2.Color = Color.Orange;
            series3.Color = Color.Red;
            tChart1.MouseDown += new MouseEventHandler(tChart1_MouseDown);
        }

        void tChart1_MouseDown(object sender, MouseEventArgs e)
        {
            Steema.TeeChart.ChartClickedPart p;
            Point pp = new Point();
            if (tChart1.Series.Count != 0)
            {
                foreach (Steema.TeeChart.Styles.Series s in tChart1.Series)
                {
                    if (s.Clicked(e.X, e.Y) != -1 && ModifierKeys == Keys.Control)
                    {
                        tChart1.AutoRepaint = false;
                        pp.X = e.X;
                        pp.Y = e.Y;
                        tChart1.Chart.CalcClickedPart(pp, out p);
                        if (p.Part == Steema.TeeChart.ChartClickedPartStyle.Series)
                        {
                            DrawSelection(p);

                        }
                    }
                    else
                    {                    
                        tChart1.AutoRepaint = true;
                       
                    }
                }
            }
        }
           private void DrawSelection(Steema.TeeChart.ChartClickedPart Part)
           {
               int t, X, Y;
               int tmpStep, tmpLast, tmpCount;
               Steema.TeeChart.Styles.Series tmpSeries = Part.ASeries;
               Steema.TeeChart.Drawing.Graphics3D g = tChart1.Chart.Graphics3D;
               
         if (Part.ASeries != null)
         {
               tmpCount = tmpSeries.LastVisibleIndex - tmpSeries.FirstVisibleIndex;
               if (tmpCount == 0) tmpCount = Part.ASeries.Count;
               if (tmpCount > 20)
               {
                   tmpStep = tmpCount/ 20;
               }
               else
               {
                   tmpStep = 1;
               }
               t = tmpSeries.FirstVisibleIndex;
               if (t == -1)t = 0;
               tmpLast = tmpSeries.LastVisibleIndex;
               if (tmpLast == -1) tmpLast = Part.ASeries.Count - 1;
               oldBrushColor = g.Brush.Color;
               oldPenColor = g.Pen.Color;
               oldGradient = g.Gradient.Visible;

               g.Gradient.Visible = false;
               g.Brush.Color = Color.Black;
               g.Pen.Color = Color.Black;
               while (t < tmpLast)
               {
                   X = tmpSeries.CalcXPos(t);
                   Y = tmpSeries.CalcYPos(t);
                   g.Rectangle(RectFormPoint1(X, Y), tmpSeries.MiddleZ);
                   t += tmpStep;
               }
               g.Brush.Color = oldBrushColor;
               oldPenColor = g.Pen.Color = oldBrushColor;
               g.Gradient.Visible = oldGradient;
               series1.Color = Color.Blue;
               series2.Color = Color.Orange;
               series3.Color = Color.Red;
         }
         
        }
           private Rectangle RectFormPoint1(int X, int Y)
           {
               //return a rectangle few pixels around XY point }
               return Steema.TeeChart.Utils.FromLTRB(X - HandleSize, Y - HandleSize, X + HandleSize, Y + HandleSize);

           }