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How to use script to reverse a chart axis of bubble chart [message #1456321]

Thu, 30 October 2014 08:33

Ankur Kedia

Messages: 1
Registered: October 2014

Junior Member

Hi,

I am new to the forum and BIRT so please pardon my lack of knowledge. I wanted to reverse a chart axis particularly y axis so that it displays from max to 0 . The chart is a bubble chart with y axis showing duration(in sec) and x axis is showing the metric "FCR". Also, the size of bubble is propotional to some other metric "volume" . Can you please help me out?
I followed the tutorial given in: birtworld.blogspot.in/2008/12/birt-reversing-chart-scale.html

However, I am encountering an error in this portion of the script:

function afterDataSetFilled(series, dataSet, icsc)
{
if( series.getSeriesIdentifier() == "series1"){
    var list = dataSet.getValues();
    for ( i=0; i < list.length; i=i+1)
    {  
        list[i] = gblscale - list[i];
    }
}
}

The error is : Cannot convert NaN to org.eclipse.birt.chart.extension.datafeed.BubbleEntry

Thanks in advance!

[Updated on: Thu, 30 October 2014 12:56] by Moderator

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Re: How to use script to reverse a chart axis of bubble chart [message #1462532 is a reply to message #1456321]

Wed, 05 November 2014 17:27

Graham Cottle

Messages: 3
Registered: November 2014

Junior Member

I believe the data values of a bubble chart are instances of:
org.eclipse.birt.chart.extension.datafeed.BubbleEntry

So you can't set the value like its done in the example:

list[i] = <value>;

You'll probably need to slightly rewrite this bit of code to set the size and value via the BubbleEntry methods e.g.:

myBubbleEntry = list[i];
myBubbleEntry.setSize( ... );
myBubbleEntry.setValue( ...);
... etc ...

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