Currently my Grid Surface chart is doing a "global zoom" quite nicely via:

NZoomTool zt = new NZoomTool();
zt.BeginDragMouseCommand = new NMouseCommand(MouseAction.Wheel, MouseButton.Middle, 0);
zt.ZoomStep = 16;
chartControl.Controller.Tools.Add(zt);


However, I'd like to catch Ctrl+Wheel as a way of affecting the chart's "Height" property.  How can I catch the Ctrl+Wheel to do this?   I can't seem to adjust height in a wheel handler without also getting the zoom from the NZoomTool.

Hi Mark,

You can create a custom tool based on the zoom tool that overrides the wheel action:

  class CustomZoomTool : NZoomTool
   {
    /// <summary>
    /// Processes wheel operations
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    public override void DoWheel(object sender, NMouseEventArgs e)
    {
      if ((ModifierKeys & Keys.Control) == Keys.Control)
      {
       if (this.GetActiveChart() != null)
       {
        this.GetActiveChart().Height *= (float)(1.0 + 10.0 / e.Delta);
        base.Repaint();
       }
      }
      else
      {
       base.DoWheel(sender, e);
      }
    }
   }

   private void Form1_Load(object sender, EventArgs e)
   {
    NChart chart = nChartControl1.Charts[0];
    chart.Enable3D = true;

    NBarSeries bar = new NBarSeries();

    bar.Values.Add(10);
    bar.Values.Add(20);
    bar.Values.Add(30);

    chart.Series.Add(bar);

    nChartControl1.Controller.Tools.Add(new NPanelSelectorTool());
    CustomZoomTool zt = new CustomZoomTool();
    zt.BeginDragMouseCommand = new NMouseCommand(MouseAction.Wheel, MouseButton.Middle, 0);
    zt.ZoomStep = 16;
    nChartControl1.Controller.Tools.Add(zt);
   }

Let us know if you meet any problems.

Best Regards,
Nevron Support Team

Thanks!