Questions

I still have the problem that if measured value is below initial yaxis range, y axis is not changed until I have moved the sensor. What have I missed?
(see next figure)

I am not sure I have understud how to use available information. The following code was written to experiment with OnCalculateNewYRange(), but it does not seem to have any positive effect on my graphs:

      protected override IRange OnCalculateNewYRange(IAxis yAxis, RenderPassInfo renderPass)
  {
     var baseRange = base.OnCalculateNewYRange(yAxis, renderPass) as IRange<double>;
     if (renderPass.DataSeries == null || baseRange == null) return baseRange;

     var latest = renderPass.DataSeries.LastOrDefault();
     if (latest?.LatestYValue == null) return baseRange;


     var t = latest.GetType();
     var min = (double)latest.YMin;
     var max = (double)latest.YMax;
     if (min > max) return baseRange;

     var diff = baseRange.Diff;
     if (double.IsInfinity(diff)) return baseRange;
     var lastValue = (double)latest.LatestYValue;

     if (Math.Abs(baseRange.Max - max) > diff * .7)
     {
        // max of timeseries much lower than max of yaxis, so have lower limit increase;
        baseRange.GrowBy(-0.1, 0);
     }
     else if (Math.Abs(baseRange.Min - min) > diff * .7)
     {
        //min of timeseries much higher than min of yaxis, so have upper limit decrease
        baseRange.GrowBy(0, -0.1);
     }
     else if (baseRange.Max - lastValue < diff * .1)
     {
        // value close to upper limit - pan y axis upwards
        baseRange.GrowBy(-0.1, 0.1);
     }
     else if (lastValue - baseRange.Min < diff * .1)
     {
        // value close to lower limit - pan y axis downwards
        baseRange.GrowBy(0.1, -0.1);
     }

     return baseRange;
  }

This method is called, but it does not have the effect I expected. (see new attached image)

Image attached now.

Thank you Andrew, that article really helped.
I added MinimalZoomConstrain to the YAxis style, and now the noise is not as visible.

           <SciChart:SciChartSurface.YAxis>
            <SciChart:NumericAxis Style="{StaticResource yAxisStyle}"
                                  MinWidth="35.0"
                                  TextFormatting="0.00"
                                  AxisAlignment="Left"
                                  AutoTicks="True"
                                  AutoRange="Always"
                                  GrowBy="0.05, 0.05"
                                  MinimalZoomConstrain="0.1"
                                  DrawMinorGridLines="False"
                                  DrawMinorTicks="True"
                                  VisibleRange="{Binding ChartYVisibleRange, Mode=OneWayToSource}"
                                  MajorDelta="{Binding ChartYMajorDelta, Mode=TwoWay}"
                                  MinorDelta="{Binding ChartYMinorDelta, Mode=TwoWay}">
            </SciChart:NumericAxis>
        </SciChart:SciChartSurface.YAxis>

Is it possible to have autoscaling trying to position the graph towards the vertical center of the graph viewport?
See attached graph of vertical position.

Hi Morten,

I know I’ve emailed you about this! For the benefit of our community, and search, please find an answer below.

We do this in one of our applications. This is where we want to AutoRange, but to clamp the YAxis Minimum to zero.

        <s:SciChartSurface.YAxes>
            <s:NumericAxis GrowBy="0.0, 0.1" AutoRange="Always" 
                           VisibleRangeLimit="0, 0" VisibleRangeLimitMode="Min"  />
        </s:SciChartSurface.YAxes>

The VisibleRangeLimit / VisibleRangeLimitMode can handle this. VisibleRange Limit Documentation is here.

There are a few suggestions in the documentation above.

Any questions please ask!

Best regards,