Incorrect X values of data points in line series

[Edward]

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

[Edward]

Just to say that we have worked around this by simply sorting the series by X value. Fortunately we actually have a scatter chart so the order of the data points doesn't matter - the workaround wouldn't be valid for a line chart.

Ed

[Evgeni "Zammy" Petrov]

Hello Edward,

 This bug has been fixed in our weekly builds and it should be out with SP1.

All the best,
Evgeni "Zammy" Petrov
the Telerik team

[Edward]

Many thanks indeed for the quick response.

Regards

Ed