Steema Central

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  private Steema.TeeChart.Tools.ZoomTool tool1;
   private System.IO.MemoryStream tmpChart;
    protected void Page_Load(object sender, System.EventArgs e)
    {
        Steema.TeeChart.Chart ch1 = WebChart1.Chart;
        tmpChart = new System.IO.MemoryStream();
        if (Session["ch1"] == null)
        {
            ch1.AutoRepaint = false;
            ch1.Aspect.View3D = false;
           //Tool Zoom
            ch1.Tools.Add(new Steema.TeeChart.Tools.ZoomTool(WebChart1.Chart));
            tool1.ZoomPenColor = System.Drawing.Color.OliveDrab;
            ch1.Panel.Gradient.Visible = false;
            ch1.Walls.Visible = false;
            
            ch1.Series.Add(new Steema.TeeChart.Styles.Points());
            ch1.Series.Add(new Steema.TeeChart.Styles.Points());
            ch1[0].FillSampleValues();
            ch1[1].FillSampleValues();
            ch1.Export.Template.Save(tmpChart);
            //save template to a Session variable
            Session.Add("ch1", tmpChart);
        }
        else
        {
            //retrieve the session stored Chart
            tmpChart = (System.IO.MemoryStream)Session["ch1"];
            //set the Stream position to 0 as the last read/write
            //will have moved the position to the end of the stream
            tmpChart.Position = 0;
            //import saved Chart
            WebChart1.Chart.Import.Template.Load(tmpChart);
            System.Drawing.Bitmap bmp = WebChart1.Chart.Bitmap((int)WebChart1.Width.Value, (int)WebChart1.Height.Value);
            myMethod();
            //If you want use zoom you only need uncoment CheckZoom
           // CheckZoom(WebChart1); 
        }
    }
    //Use My method to get the rectangle zoom coordinates. 
    private void myMethod()
    {
        Hashtable ht = getZoomArgs(Request);
        int X0 = Convert.ToInt32(ht["x0"]);
        int Y0 = Convert.ToInt32(ht["y0"]);
        int X1 = Convert.ToInt32(ht["x1"]);
        int Y1 = Convert.ToInt32(ht["y1"]);
        ListBox1.Items.Clear();
        if ((X0 != -1) && (Y0 != -1))
        {
            foreach (Steema.TeeChart.Styles.Series s in WebChart1.Chart.Series)
            {
                for (int i = 0; i < s.Count; i++)
                {
                    if (CheckSeriesPoints(s, i, X0, Y0, X1, Y1))
                    {
                        ListBox1.Items.Add("Series:"+s.Title+"Point " + i.ToString() + ": " + s.XValues[i].ToString() +
                                                      ", " + s.YValues[i].ToString());
                    }
                }
            }
        }
    }
    //CheckSeriesPoint is in the rectangle or not. 
    private bool CheckSeriesPoints(Steema.TeeChart.Styles.Series s, int index, int X0,int Y0, int X1, int Y1)
    {
        return ((s.CalcXPos(index) >= X0) && (s.CalcXPos(index) <= X1) && (s.CalcYPos(index) >= Y0) && (s.CalcYPos(index) <= Y1));

    }
    //Do zoom. 
    private void CheckZoom(Steema.TeeChart.Web.WebChart wChart)
    {
        System.Collections.ArrayList zoomedState = (System.Collections.ArrayList)Session[Request.QueryString["filename"] + "Zoomed"];
        System.Drawing.Bitmap bmp = WebChart1.Chart.Bitmap((int)wChart.Width.Value, (int)wChart.Height.Value);

        if (wChart.Chart.Tools.Count > 0)
        {
           zoomedState = ((Steema.TeeChart.Tools.ZoomTool)wChart.Chart.Tools[0]).SetCurrentZoom(Request, zoomedState);
            if (zoomedState != null)
            {

                Session.Add(Request.QueryString["filename"] + "Zoomed", zoomedState);
            }
            else
                Session.Remove(Request.QueryString["filename"] + "Zoomed");
        }
    }
    //Need to get arguments of Zoom tool to allow you calculate rectangle.
    protected Hashtable getZoomArgs(HttpRequest r)
    {
        Hashtable argumentList = new Hashtable();
        if ((r.Params["__EVENTARGUMENT"] != null) && (r.Params["__EVENTARGUMENT"].Length > 0))
        {
            char[] pairs = new char[1] { ';' };
            char[] vals = new char[1] { '$' };

            String[] varpairs = r.Params["__EVENTARGUMENT"].Split(pairs);

            foreach (string s in varpairs)
                if (s.IndexOf("$") != -1)
                    argumentList.Add(s.Split(vals)[0], s.Split(vals)[1]);
        }

        return argumentList;
    }