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Incorrect X values of data points in line series

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Edward asked on 09 Dec 2010, 02:05 PM

incorrect-x-values.PNG

Hi,

Our users have discovered that the X values of data points in line series charts are not always correct. See attached picture of a simple plot of 7 data points. The labels are correct, but notice that the points (2,2), (5,4) and (6,6) are not in the correct position on the X axis.

I hope you agree that incorrectly-plotted data is a serious issue - if this is a bug please fix urgently. Apologies if we are doing something wrong in the chart setup. The chart was created using the following simple XAML:

<telerik:RadChart Height="480" HorizontalAlignment="Left" Name="chart" VerticalAlignment="Top" Width="640" />

And the following code behind:

public MainPage()

{

InitializeComponent();

chart.SeriesMappings.Add(CreateSeriesMapping());

chart.ItemsSource = CreateSeries();

chart.DefaultView.ChartArea.AxisX.MajorGridLinesVisibility = Visibility.Visible;

chart.DefaultView.ChartArea.AxisX.MinorGridLinesVisibility = Visibility.Visible;

chart.DefaultView.ChartArea.AxisY.MajorGridLinesVisibility = Visibility.Visible;

chart.DefaultView.ChartArea.AxisY.MinorGridLinesVisibility = Visibility.Visible;

}

private SeriesMapping CreateSeriesMapping()

{

SeriesMapping seriesMapping = new SeriesMapping();

LineSeriesDefinition lineSeriesDefinition = new LineSeriesDefinition();

lineSeriesDefinition.ItemLabelFormat = "#X, #Y";

seriesMapping.SeriesDefinition = lineSeriesDefinition;

seriesMapping.ItemMappings.Add(new ItemMapping("Key", DataPointMember.XValue));

seriesMapping.ItemMappings.Add(new ItemMapping("Value", DataPointMember.YValue));

return seriesMapping;

}

private List<KeyValuePair<int, int>> CreateSeries()

{

List<KeyValuePair<int, int>> series = new List<KeyValuePair<int, int>>();

series.Add(new KeyValuePair<int, int>(0, 1));

series.Add(new KeyValuePair<int, int>(2, 2));

series.Add(new KeyValuePair<int, int>(1, 3));

series.Add(new KeyValuePair<int, int>(5, 4));

series.Add(new KeyValuePair<int, int>(3, 5));

series.Add(new KeyValuePair<int, int>(6, 6));

series.Add(new KeyValuePair<int, int>(4, 7));

return series;

}

It seems that there is difficulty whenever a data point's X value is less than the previous data point's X value. I even wondered whether the line is able to go "backwards" at all - we have managed to do this, but with interesting results (e.g. the same position in the graph being labelled twice!).

Regards

Ed

Incorrect X values of data points in line series

3 Answers, 1 is accepted