Can I include/exclude certain points from a SeriesMapping Itemsource from being drawn

3 posts, 0 answers
  1. Rob
    Rob avatar
    8 posts
    Member since:
    Jan 2013

    Posted 19 Nov 2013 Link to this post

    Suppose I have a the following class

    public class DataRow
    {
        public int X { get; set; }
        public int Y { get; set; }
     
        public bool Exclude;
    }

    I want to plot this on a RadChart using a seriesmapping, which I do like this.

    ObservableCollection<DataRow> SeriesSource = new ObservableCollection<DataRow>();
    SeriesMapping series = new SeriesMapping();
    series.ItemsSource = source;
    series.ItemMappings.Add(new ItemMapping("X", DataPointMember.XValue));
    series.ItemMappings.Add(new ItemMapping("Y", DataPointMember.YValue));

    Is there any way that I can include/exclude data points being plotted based on the value of 'Exclude'? I wish to be able to include/exclude certain points from the plotted line.

    The only other solution I can think of is to scan through the collection and create a second collection just containing members which aren't excluded. This doesn't seem very efficient though.
  2. Rob
    Rob avatar
    8 posts
    Member since:
    Jan 2013

    Posted 20 Nov 2013 Link to this post

    I've found the feature I need, I'm adding a ChartFilterDescriptor to the series like this....

    ChartFilterDescriptor filter = new ChartFilterDescriptor();
    filter.Member = "Excluded";
    filter.Operator = FilterOperator.IsEqualTo;
    filter.Value = false;
     
    series.FilterDescriptors.Add(filter);

    This works, but only when the series is originally drawn. If I change the value of Exclude (calling NotifyPropertyChanged etc) this isn't reflected in the chart, the plots change correctly when I change the X & Y values though.

    Is there something I'm missing to will I have to recreate the series each time the value of Exclude changes?
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  4. Petar Marchev
    Admin
    Petar Marchev avatar
    968 posts

    Posted 22 Nov 2013 Link to this post

    Hello Craig,

    I suggest you go with your original idea about creating a second items source collection that you update when needed. It will not be more efficient if you use a filter descriptor.

    On a side note - if you have not integrated the old RadChart into your project, I suggest you consider using the new ChartView which has a higher performance rate and generally it is more flexible.

    Regards,
    Petar Marchev
    Telerik
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