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Custom ChartAggregateFunction

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Nick Wood
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Nick Wood asked on 22 Mar 2010, 06:47 AM
Hello

Is there a way to create a custom ChartAggregateFunction.

Scenario:
I need to chart the aggregate average based on grouped data from 2 columns in a gridview. ie (column1 - column2) / column2

Any help would be great.

Nick

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Ves
Telerik team
answered on 24 Mar 2010, 03:30 PM
Hello Nick,

I am afraid RadChart does not support this type of aggregate functions. Actually, this would be more like "Calculated series" but not an aggregate function. You can achieve it by wiring ItemDataBound and modifying the YValue of the DataPoint in the event handler:

void RadChart1_ItemDataBound(object sender, Telerik.Windows.Controls.Charting.ChartItemDataBoundEventArgs e)
        {
            MyCalcData dataItem = e.DataItem as MyCalcData;
            e.DataPoint.YValue = (dataItem.MyProperty1 - dataItem.MyProperty2) / dataItem.MyProperty2;
        }

Unfortunately, I have some bad news -- the above code is not applicable at the moment due to a bug in the control. Our developers assured me that the bug will be fixed in the next internal build, which will be available on Friday and you will be able to test it. Please, accept our apologies for the inconvenience. I have updated your Telerik points as your question led us to a bug in RadChart.

Sincerely,
Ves
the Telerik team

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Nick Wood
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answered on 29 Mar 2010, 07:09 AM
Took about 1 hours to update all binaries and re reference in all modules to latest internal build:
Silverlight_2010_1_0326

but when I try to show a module that contains a RadDocking control (I think this is what is unique about this module) I get:

Unhandled Error in Silverlight Application
Code: 2012    
Category: ParserError       
Message: Unknown attribute ContentTemplateSelector on element ContentPresenter.     
File:      
Line: 17     
Position: 90

Is there an easier way to update to a new build?

Please help as this is costing me alot of time



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Miroslav Nedyalkov
Telerik team
answered on 30 Mar 2010, 08:55 AM
Hello Nick,

 There is a problem in the Docking assembly. We will fix it for the next internal build. We apologize for the inconvenience caused.

All the best,
Miroslav Nedyalkov
the Telerik team

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Nick Wood
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Ves
Telerik team
Nick Wood
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Miroslav Nedyalkov
Telerik team
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