Chart Y Axis scaling problem

[Bill Korchinski]

When I add a custom point to a series of charts, sometimes the automatic chart Y axis scaling is such that the custom point is not on the chart. Here is an example of my code.

myCharts.PrimaryYAxis.RangeType = ChartAxisRangeType.Auto

Dim Series1 As ChartSeries
Dim CusPoint As New ChartCustomPoint()

series1 = ... (fill Series1 up with data)
cusPoint = ... (put data into cusPoint)

myCharts.Series.Add(Series1)
myCharts.CustomPoints.Add(CusPoint)

The Y range of the data in "Series1" is from 1000 - 1220. The Y value of CusPoint is 1250. Series1 plots fine. However, because the chart is automatically scaled from about 900 to 1230, cusPoint never shows up.

Is there a problem with the automatic scaling algorithm? Do I need to do things in a different order?

Thanks,

Bill

[Davis Jebaraj]

Hi Bill, The ChartControl does not compute the X axis or Y axis range taking into account the custom points. You should set the range of the Y axis to be a custom value (when the custom point is not within the range of the series points): Me.ChartControl1.PrimaryYAxis.RangeType = ChartAxisRangeType.Set Me.ChartControl1.PrimaryYAxis.Range.Min = 1000 Me.ChartControl1.PrimaryYAxis.Range.Max = 1350 Please see the sample linked to below: http://www.syncfusion.com/support/user/Uploads/ChartCustomPoint_3936.zip Regards, Davis

[Bill Korchinski]

Thanks- WK

[Ed Noepel]

>The ChartControl does not compute the X axis or Y axis range taking into account the custom points.

Is this also an issue for non-custom points when the series is updated in real time? I have:

_chart.PrimaryYAxis.RangeType = ChartAxisRangeType.Auto;

I make a change to the data in the series and call:

_chart.PrimaryYAxis.Update()

afterwards, but the Y-axis never updates.

[Suresh Babu]

Hi Ed,

You can change the Range Type to 'Set' or 'Auto' with in Chart Control's Begin Update and End Update. For example, Please have a look into the below sample code.

[C#]
this.chartControl1.BeginUpdate();
this.chartControl1.PrimaryXAxis.RangeType = ChartAxisRangeType.Auto;
this.chartControl1.EndUpdate();

Please find the sample attached.

Chart Axis Range sample

Please let me know if this helps.

Regards,
Sureshbabu

[Administrator]

If I make changes to a datapoint inside a Begin/EndUpdate block, the axes update appropriately.

>Hi Ed,

You can change the Range Type to 'Set' or 'Auto' with in Chart Control's Begin Update and End Update.