Infragistics Forums

I’m using a 3D Cylinder Column Chart.  These charts are then used in creating a PDF by way of the Infragistics.Documents.Report object.  Is it possible to display data values that are zero (0) as nothing, or as a different color?  i.e. I don’t want a flat, round, red disk displayed when the value is zero (0).

You should handle the ChartDrawItem event and remove the drawing of anything that has to do with the 0 valued data points. Here's some sample code:

    protected void UltraChart1_ChartDrawItem(object sender, Infragistics.UltraChart.Shared.Events.ChartDrawItemEventArgs e)
    {
        if (e.Primitive.Value != null)
        {
            Double val = (Double)e.Primitive.Value;
            if (val == 0)
            {
                e.Primitive.Visible = false;
            }
        }
    }

 WARNING: This is very hacked together code, you'd probably want to handle exceptions and do a better check to make sure what you're dealing with is actually going to give you a Primitive.Value that is a double, but this should set you on the right track.

 Good luck, and let me know how it goes.

That did the trick!  Thank you very much.

Now if I can just figure out how to change the color ... I can do this for 2D but can't get it to work with 3D. 

I'm using:

 e.Primitive.PE.Fill and e.Primitive.PE.FillStopColor

Any ideas?

I'm sorry to report that it's not really possible at this time to do what you want to do without using the ColorModel. Take a look at this:

http://devcenter.infragistics.com/Support/KnowledgeBaseArticle.aspx?ArticleID=978

So basically it'll scroll through all those colors that you specify, so you'll be forced to specify a color for every bar and then a specific color for bars that have a value of zero. I hope this helps and let me know how it goes, -Paul

It turns out that I'm able to use the Infragistics.UltraChart.Core.Primitives.Path object.
The IntelliSense indicates this is for 2D but it does work for the ChartType.CylinderColumnChart3D.

/// <summary>
/// Change the chart based upon the data being displayed.
/// </summary>
/// <param name="e"></param>
public static void HandleZeroValueInData(ChartDrawItemEventArgs e)
{
    if (e.Primitive.Value != null)
    {
        object oValue = e.Primitive.Value;
        if ((oValue is double) || (oValue is int) || (oValue is decimal))
        {
            double theDataValue = Convert.ToDouble(oValue);
            if (theDataValue <= 0)
            {
                if (e.Primitive is Infragistics.UltraChart.Core.Primitives.Path)
                {
                    Infragistics.UltraChart.Core.Primitives.Path thePath =
                        (Infragistics.UltraChart.Core.Primitives.Path) e.Primitive;
                    thePath.Brush = Brushes.WhiteSmoke;
                }
            }
        }
    }

} // end HandleZeroValueInData()

Awesome! I'm glad you found a workaround, good luck with the rest of your charting.

-Paul