Interacting with legend | Infragistics Forums

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Interacting with legend

Lian posted over 16 years ago

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.

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28496

Offline David Negley posted over 16 years ago

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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295

Lian posted over 16 years ago in reply to David Negley

I cant find those two events, am I maybe missing a hotfix or something? am using Infragistics3.WPF.Chart.v7.2
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Offline David Negley posted over 16 years ago in reply to Lian

oops! i got confused and thought i was in the ASP.NET or WinForms newsgroups. unfortunately, we don't have a solution for this yet on the WPF side of things.
if you'd like to see this capability in a future release, please submit a feature request here: http://devcenter.infragistics.com/protected/requestfeature.aspx
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135

Raghavendra NLV posted over 14 years ago in reply to David Negley

Hi

Your code works fine for me. But i want to hide all other lines when a legend is clicked. If the chart is clicked again all the lines should reappear. How to do it?

Thank you
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Offline David Negley posted over 14 years ago in reply to Raghavendra NLV

nlvraghavendra,

let's discuss that in this thread: http://community.infragistics.com/forums/p/41045/228961.aspx#228961
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