Hi,

I'm adding a NDataZoomTool and a NSelectorTool and a NDataPanTool() to a NCartesianChart followed by adding a RangeSelections

m_Chart.RangeSelections.Add(new NRangeSelection());

I would like to perform a Zoom of a muliYaxis plot, see Image 1. However, when I try to Zoom in a on part of the graph only the left Y-axis is scaled according the zoom - the right Y-axis is not scaled (is ot affected by the zoom) - see attached Image 2 and Image 3.

Hello Hans,

 I have had a similar problem - and couldnt find sort of build in function to do so. Hence I implemented it manually:

Implement the following within the OnDataZoom_EndDrag - Event:
         NRange1DD contentRange = oChart.Axis(StandardAxis.PrimaryX).ViewRange;
          NRange1DD viewRange = oChart.Axis(StandardAxis.PrimaryX).Scale.RulerRange;
          double beginFactor = contentRange.GetValueFactor(viewRange.Begin);
          double endFactor = contentRange.GetValueFactor(viewRange.End);

          bool bolXZoomActive = (beginFactor == 0.0 && endFactor == 1.0) ? false : true;

          // compute factors Y Zoom
          contentRange = oChart.Axis(StandardAxis.PrimaryY).ViewRange;
          viewRange = oChart.Axis(StandardAxis.PrimaryY).Scale.RulerRange;
          beginFactor = contentRange.GetValueFactor(viewRange.Begin);
          endFactor = contentRange.GetValueFactor(viewRange.End);

          bool bolYZoomActive = (beginFactor == 0.0 && endFactor == 1.0) ? false : true;


          if (_PlotData.MultipleYAxis && true) {    //NewFeature: MultipleYAxis 2014_09           
           // then for all other y axes make sure their view range factor equals to begin/end factor
           if (bolYZoomActive) {
            // disable Scrollbar for all Y-Axis except primary YAxis
            foreach (NAxis axis in oChart.Axes) {
              if (axis.AxisId != (int)StandardAxis.PrimaryY && axis.AxisOrientation == AxisOrientation.Vertical) {
               axis.PagingView.Enabled = true;

               // compute the new range based on factor
               NRange1DD axisContentRange = axis.ViewRange;
               double rangeLength = axisContentRange.End - axisContentRange.Begin;

               double begin = axisContentRange.Begin + beginFactor * rangeLength;
               double end = axisContentRange.Begin + endFactor * rangeLength;

               axis.PagingView.ZoomIn(new NRange1DD(begin, end), 0.0001);
              }
            }

           }
           else {
            // full view no zoom
            foreach (NAxis axis in oChart.Axes) {
              if (axis.AxisId != (int)StandardAxis.PrimaryY && axis.AxisOrientation == AxisOrientation.Vertical) {
               axis.PagingView.Enabled = false;
              }
            }
           }

          }

          bool bolRecalcLayout = _PlotData.MultipleYAxis;

Maybe afterwards you have to do the following as well:
_NevronChart.document.Calculate();   //ruler values must be calculated first
_NevronChart.document.RecalcLayout(_NevronChart.View.Context);
_NevronChart.Refresh();

Best regards,
Joern

Hi All,
You can also check out the following example - All Examples \ Interactivity \ Tools \ Multiple Axes Zooming and Scrolling - it shows how to simultaneously zoom in / out two vertical axes.

Best Regards,
Nevron Support Team

Thanks for the example, Nevron Support Team. 

When I use the OnDataZoom_EndDrag, basically everything works as expected. But I have slightly a problem when the red dot of the PagingView is pressed after multiple zooming has been done (e.g. X-Axis has a total range from10 to 90; then first zoom in 20 to 80 and then zoom even further in from 50 to 60 - and now click red dot of the PagingViewBar near the XAxis) :
in this case, the OnDataZoom_EndDrag-event is fired, but the following doesnt work anymore:

Implementation in OnDataZoom_EndDrag-Event:
_NevronChart.document.Calculate();
_NevronChart.document.RecalcLayout(_NevronChart.View.Context);
...
oChart.Axis(StandardAxis.PrimaryX).CalculateAxis(_NevronChart.View.Context);
NRange1DD contentRange = oChart.Axis(StandardAxis.PrimaryX).ViewRange;
contentRange = oChart.Axis(StandardAxis.PrimaryX).ContentRange;
NRange1DD viewRange = oChart.Axis(StandardAxis.PrimaryX).Scale.RulerRange;

=> now oChart.Axis(StandardAxis.PrimaryX).ViewRange and oChart.Axis(StandardAxis.PrimaryX).Scale.RulerRange are the same
and return for the example above  10 to 90 instead 20 to 80.
The real shown view afterwards however, is from 20 to 80.

Is there a way to force oChart.Axis(StandardAxis.PrimaryX).Scale.RulerRange to return the correct values (20 to 80) within the OnDataZoom_EndDrag-Event?

When I look to the Nevron example (All Examples \ Interactivity \ Tools \ Multiple Axes Zooming and Scrolling), the prefered event for doing so should be Scale_RulerRangeChanged. I understand this. But since the OnDataZoom_EndDrag is fired when the red dot is clicked, it should also be working correctly (or it should not be fired at all in this case).

Thanks for the help,
Best regards,
Joern

Hi Joern,

Most likely you have the NDataZoomTool added before the NAxisScrollTool in the tools collection.

Best Regards,
Nevron Support Team