Unzoom

[Will]

I am using 'Steema TeeChart for .NET 2015 4.1.2015.03110\net40\x86\TeeChart.dll'

I'm trying to unzoom programmatically using Chart.Zoom.Undo(); but it won't work.
I also tried using the ZoomTool which is added to the chart but none of my approaches led
to the desired result,

any advice?

[Christopher]

I'm trying to unzoom programmatically using Chart.Zoom.Undo(); but it won't work.
I also tried using the ZoomTool which is added to the chart but none of my approaches led
to the desired result,

Using the same TeeChart.dll and the following code:

Code: Select all

    Line series1;
    private void InitializeChart()
    {
      tChart1.Aspect.View3D = false;
      tChart1.Legend.Visible = false;
      series1 = new Line(tChart1.Chart);

      series1.FillSampleValues();
    }
    private void button4_Click(object sender, EventArgs e)
    {
      tChart1.Zoom.Undo();
    }

I can run the project, zoom the chart with the mouse, and then click the button to successfully reset the chart. Could you please modify the above code snippet so I can reproduce your issue here?

[Will]

All right

aspx:

Code: Select all

<tchart:WebChart ID="WebChart" runat="server" Height="228px" Width="542px" GetChartFile="GetChart.aspx" TempChart="Session" />

codebehind:

Code: Select all

private string SSN_KEY_CHART_DATA = "chartData";

protected void Page_Load(object sender, EventArgs e)
{           
    InitializeChart();
    CheckZoom();
}

private void InitializeChart()
{
    if (WebChart.Chart.Tools.Count == 0)
    {
        WebChart.Chart.Tools.Add(new ZoomTool());
     }
      
     RestoreState();

     if (WebChart.Chart.Series.Count == 0)
     {
         Line series1;
         WebChart.Chart.Aspect.View3D = false;
         WebChart.Chart.Legend.Visible = false;
         series1 = new Line(WebChart.Chart);

         series1.FillSampleValues();
         SaveState();
      }
}

private System.IO.MemoryStream ChartData
{
    get
    {
         if (Page.Session[SSN_KEY_CHART_DATA] == null)
         {
              Page.Session[SSN_KEY_CHART_DATA] = new System.IO.MemoryStream();
          }

         System.IO.MemoryStream tmp = Page.Session[SSN_KEY_CHART_DATA] as System.IO.MemoryStream;
         tmp.Seek(0, System.IO.SeekOrigin.Begin);

         return tmp;
     }
     set
     {
         Page.Session[SSN_KEY_CHART_DATA] = value;
     }
}

public void SaveState()
{
     ChartData = new System.IO.MemoryStream();
     WebChart.Chart.Export.Template.Save(ChartData);
}

private void RestoreState()
{
     if (ChartData.Length != 0)
     {
         WebChart.Chart.Import.Template.Load(ChartData);
     }
}

private void CheckZoom()
{
     ArrayList zoomedState = (ArrayList)Session[UniqueID + "Zoomed"];
     ZoomTool zoomTool = (ZoomTool)WebChart.Chart.Tools[0];

     zoomedState = zoomTool.SetCurrentZoom(Page.Request, zoomedState);
     if (zoomedState == null)
     {
          Session.Remove(UniqueID + "Zoomed");
     }
     else
     {
          Page.Session.Add(UniqueID + "Zoomed", zoomedState);
     }
}

protected void Button3_Click(object sender, EventArgs e)
{
     WebChart.Chart.Zoom.Undo();
}

EDIT: The project I'm working on is an Asp.Net WebForm using .NET Framework 4

[Christopher]

Hello Will,

Apologies for the fact that over twenty-four hours have passed without a response to your issue. Just to let you know that we are presently looking into it and that we hope to have a response for you very shortly.

[Christopher]

Will,

Two possible solutions, the first in the page-behind file, e.g.

Code: Select all

  private void CheckZoom()
  {
    CheckZoom((ArrayList)Session[UniqueID + "Zoomed"]);
  }

  private void CheckZoom(ArrayList zoomedState)
  {
    ZoomTool zoomTool = (ZoomTool)WebChart1.Chart.Tools[0];

    zoomedState = zoomTool.SetCurrentZoom(Page.Request, zoomedState);
    if (zoomedState == null)
    {
      Session.Remove(UniqueID + "Zoomed");
    }
    else
    {
      Page.Session.Add(UniqueID + "Zoomed", zoomedState);
    }
  }

  protected void Button1_Click(object sender, EventArgs e)
  {
    CheckZoom(null);
    Page_Load(sender, e);
  }

and the second a javascript function in the page itself, e.g.

Code: Select all

</head>

    <script type="text/javascript">

        function resetZoom() {

            __doPostBack(WebChart1, 'chart$WebChart1;zoom$0');

        }

    </script>

<body>

    <form id="form1" runat="server">

    <div>

   

    </div>

      <tchart:WebChart ID="WebChart1" runat="server" Height="500px" Width="800px" GetChartFile="GetChart.aspx" TempChart="Session" />

      <!--<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />-->

      <button type="button" onclick="resetZoom();">ResetZoom</button>

    </form>

</body>

[Will]

I used the first solution and it's working,

thank you