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Lian
295
Interacting with legend
posted

Hi

 I'm trying to highlight a legend item if the user clicks on the series, and highlight a series if the user
clicks on the legend item it belongs too.

Is there some way I can do this? I'm unable to find the legend items added by default.

Parents
  • 28496
    Offline posted

    you can do this by handling the ChartDrawItem and ChartDataClicked events, as in this sample code

    public partial class Form1 : Form

    {

    public Form1()

    {

    InitializeComponent();

    this.CurrentRow = -1;

    }

    private void Form1_Load(object sender, EventArgs e)

    {

    this.ultraChart1.ChartType = ChartType.ColumnChart;

    this.ultraChart1.Legend.Visible = true;

    this.ultraChart1.ColorModel.ModelStyle = ColorModels.CustomSkin;

    this.ultraChart1.ColorModel.Skin.PEs.Add(new PaintElement(Color.Red));

    this.ultraChart1.ColorModel.Skin.PEs.Add(new PaintElement(Color.Green));

    this.ultraChart1.ColorModel.Skin.PEs.Add(new PaintElement(Color.Blue));

    this.ultraChart1.ColorModel.Skin.ApplyRowWise = true;

    this.ultraChart1.Data.DataSource = Infragistics.UltraChart.Data.DemoTable.Table();

    this.ultraChart1.ChartDrawItem += new Infragistics.UltraChart.Shared.Events.ChartDrawItemEventHandler(ultraChart1_ChartDrawItem);this.ultraChart1.ChartDataClicked += new ChartDataClickedEventHandler(ultraChart1_ChartDataClicked);

    }

    private int CurrentRow { get; set; }

     

    private void ultraChart1_ChartDrawItem(object sender, ChartDrawItemEventArgs e)

    {

    if (e.Primitive.Path != null && e.Primitive.Path.IndexOf("Legend") != -1)

    {

    e.Primitive.Caps |=     PCaps.HitTest;

    }

    if (this.CurrentRow != -1 && e.Primitive.Row == CurrentRow)

    {

    e.Primitive.PE =     new PaintElement(Color.Yellow);

    }

    }

    private void ultraChart1_ChartDataClicked(object sender, ChartDataEventArgs e)

    {

    this.CurrentRow = e.Primitive.Row;this.ultraChart1.InvalidateLayers();

    }

    }

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