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MaryEllen
615
Line Chart Fill Scene Graph
posted

I am trying to draw a line at y = 20, using some sample code I saw for a bar chart, however, e.Grid["X"] is always null. 

How do I solve this?

void DrawLimitLines(object sender, Infragistics.UltraChart.Shared.Events.FillSceneGraphEventArgs e)

{

//gets the X and Y axis

IAdvanceAxis x = (IAdvanceAxis)e.Grid["X"];

IAdvanceAxis y = (IAdvanceAxis)e.Grid["Y"];

//checks if axis exist

if (x != null)

{

//figures out the coordinate to draw

//a line at y=100

int target = 20;

int yVal = (int)y.Map(target);

int xStart = (int)x.Map(0);

int xEnd = (int)x.Map(50);

Line l = new Line(new Point(xStart, yVal), new Point(xEnd, yVal));l.PE.Stroke = Color.Red;

e.SceneGraph.Add(l);

}

}

#endregion

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  • 28496
    Offline posted

     if you're using a Composite Chart, you might need to reference the axes using an expression like

    this.ultraChart1.CompositeChart.ChartLayers[0].ChartLayer.Grid["X"]

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