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Line Chart Legend Probrem
posted

Hello,

I have a problem with Legend in LineChart (Rf: Picture). I add some Series with Color but the correspondant Color in Legend are different. I try using FillSceneGraph and ChartDrawItem like in some example here in Forum but i didnt work:

        static void UltraChart_ChartDrawItem(object sender, ChartDrawItemEventArgs e)
        {

            if (e.Primitive is Polyline || (e.Primitive is Box && e.Primitive.Path != null && e.Primitive.Path.IndexOf("Legend") != -1))
            {
                if (e.Primitive.Series != null)
                {
                    if (e.Primitive.Series.Label == "Sparkasse i.Zshg.m. Produkt-, Unternehmensmeldungen")
                        e.Primitive.PE = new PaintElement(Color.Red);
                    if (e.Primitive.Series.Label == "Deutsche Bank i.Zshg.m. Produkt-, Unternehmensmeldungen")
                        e.Primitive.PE = new PaintElement(Color.Blue);
                    if (e.Primitive.Series.Label == "Dresdner Bank i.Zshg.m. Produkt-, Unternehmensmeldungen")
                        e.Primitive.PE = new PaintElement(Color.Green);
                    if (e.Primitive.Series.Label == "Postbank i.Zshg.m. Produkt-, Unternehmensmeldungen")
                        e.Primitive.PE = new PaintElement(Color.YellowGreen);
                    if (e.Primitive.Series.Label == "Commerzbank i.Zshg.m. Produkt-, Unternehmensmeldungen")
                        e.Primitive.PE = new PaintElement(Color.Yellow);
                }
            }
        }

Any Solutions are welcome.

Thanks

  • 28496
    Suggested Answer
    Offline posted

    probably e.Primitive.Series is going to be null there.

    try this instead:

      private void ultraChart1_FillSceneGraph(object sender, FillSceneGraphEventArgs e)
            {
                for (int current = 0; current < e.SceneGraph.Count; current++)
                {
                    Primitive currentPrim = e.SceneGraph[current];
                    bool legendBox = currentPrim is Box && currentPrim.Path != null && currentPrim.Path.Contains("Legend") && currentPrim.Row == 0;
                    if (legendBox && current < e.SceneGraph.Count - 1)
                    {
                        Text nextLabel = e.SceneGraph[current + 1] as Text;
                        if (nextLabel != null)
                        {

    string nextLabelText = nextLabel.GetTextString();
    // do what you want here based on the text in the legend label
                        }
                    }
                }