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Danny
1365
Show data value of single point
posted

Dear experts,

I've followed the following example from this forum (because i'm learning to use the UltraChart):

this.ultraChart1.ChartType = Infragistics.UltraChart.Shared.Styles.ChartType.ScatterChart;

XYSeries series1 = new XYSeries();

series1.Points.Add(new XYDataPoint(1, 0.1, "", false));

series1.Points.Add(new XYDataPoint(2, 0.2, "", false));

XYSeries series2 = new XYSeries();

series2.Points.Add(new XYDataPoint(3, 0.2, "", false));

series2.Points.Add(new XYDataPoint(4, 0.3, "", false));

this.ultraChart1.Series.Add(series1);

this.ultraChart1.Series.Add(series2);

Works fine. In the wizard you can check that you want to "Show data value on chart". This will show ALL data values per point in the chart. But for a real world problem of mine I would like to show the 'data value'  of a single point of 1 serie on the chart.

So for example in the above code, if I would like to show the data value of the 2nd point in series 1. How would I do that?

Thank you very much in advance for answering.

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  • 5118
    Verified Answer
    posted

    Hi,

    I would probably just add a text primitive to the chart and position it over that point.  Something like this:

    private void ultraChart1_FillSceneGraph(object sender, Infragistics.UltraChart.Shared.Events.FillSceneGraphEventArgs e)
        {

            SceneGraph scene = e.SceneGraph;
            PointSet ps = null;
            for (int i = scene.Count - 1; i >= 0; i--)
            {
                ps = scene[i] as PointSet;
                if (ps != null && ps.Series.Key == "series2")
                {
                    DataPoint dp = ps.points[1];
                    Point p = dp.point;
                    p.Offset(-4, 0);
                    Infragistics.UltraChart.Core.Primitives.Text tprim = new Text(p, ((object[]) dp.Value)[0].ToString());
                    
                    e.SceneGraph.Add(tprim);
                }
            }
        }
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