Comments on: Missing values in Flex charts

By: diablo3

diablo3 — Fri, 20 Jan 2012 14:38:57 +0000

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By: Dave

Dave — Thu, 22 Sep 2011 14:59:25 +0000

Sure, I would like to see a gap in my area chart where missing values are. I have assigned the value NaN to the values I don’t want to show. This works perfectly in line charts. However in the area chart it actually plots the value that should be missing. It places the point at 0 on the y axis. So when the area fill draws it draws it from the last known good point, lets say 10, down to 0 or the missing. It should just be drawing it to the 10 and filled in. So what you see is an angle down from 10 to 0. It should just stop at the last know good value of 10. Also since the missing data point is plotted you get a dataTip with value of NaN. That should never happen. Does this make sense?

By: Graham Odds

Graham Odds — Thu, 22 Sep 2011 07:48:44 +0000

Hi Dave,

I’m afraid I don’t quite follow what you are describing. Do you have an example you could share to give me a better idea of what is happening and what you want to happen?

Regards,
Graham

By: Dave

Dave — Wed, 21 Sep 2011 21:33:41 +0000

Hi, So I am having the area problem as well. But my issue is a little different. I have missing values that I desire and have those set using the NaN. The problem is on my AreaChart it is placing those values on the chart. So I see my area filled in down to the NaN value which is placed at 0. The dataTip has NaN in it as the value even. If I understand your solution correctly, you are saying that changing the AreaRenderer would fix this. But I don’t understand how this would work if my NaN (missing) value is actually getting plotted on the chart. I would think it would just fill out to that value instead of the prior valid value before it. Any ideas?

Thanks,
Dave

By: Keith

Keith — Wed, 15 Sep 2010 16:28:41 +0000

Hi Graham,

Thanks – I was able to get around this by “tricking” flex. I did this by creating a data object that sets the area_maximum_value = area_minimum_value. I then inserted this data at the beginning of the missing data and at end of the missing data. I believe flex renders the “area” along this missing space, but as the max and min are the same there is no area to draw. A bit of a hack, but it worked.

I am now, however, faced with the same issue on an area chart and this method does not work. I will look into a custom renderer.

Keith

P.S Funny your post was on 4/12 and I swear I checked it as late as the 15th or 20th and didn’t see a reply.

By: Graham Odds

Graham Odds — Mon, 12 Apr 2010 07:52:10 +0000

Hi Keith, I believe this is due to how the default AreaRenderer does its drawing: it simply fills all area below the line. To "fix" this you would have to create a custom series renderer that replaces the default begin fill -> draw polyline -> end fill approach with a repeated begin fill -> draw line segment -> end fill approach. That way it would be simple enough to not fill the areas where there is no line segment. Hope this helps, Graham

By: Keith

Keith — Thu, 08 Apr 2010 17:07:25 +0000

On an area series when filter data is set to true – the area is still filled in on missing data. This behavior is not like the line series example above where there is a blank area in the line.

Any thoughts?

Thanks
Keith

By: Christopher Black

Christopher Black — Mon, 18 Jan 2010 20:40:59 +0000

Thanks for the post and link to the Adobe bug. This is exactly what I was looking for.

By: Wim

Wim — Fri, 03 Jul 2009 14:21:27 +0000

Actually, FilterDataOff crashes with:

TypeError: Error #1009: Cannot access a property or method of a null object reference.
at mx.charts.series::AreaSeries/updateTransform()[C:\work\flex\dmv_automation\projects\datavisualisation\src\mx\charts\series\AreaSeries.as:1620]
at mx.charts.chartClasses::Series/validateTransform()[C:\work\flex\dmv_automation\projects\datavisualisation\src\mx\charts\chartClasses\Series.as:1571]
at mx.charts.chartClasses::Series/updateDisplayList()[C:\work\flex\dmv_automation\projects\datavisualisation\src\mx\charts\chartClasses\Series.as:828]
at mx.charts.series::AreaSeries/updateDisplayList()[C:\work\flex\dmv_automation\projects\datavisualisation\src\mx\charts\series\AreaSeries.as:852]
at mx.core::UIComponent/validateDisplayList()[C:\autobuild\3.3.0\frameworks\projects\framework\src\mx\core\UIComponent.as:6351]
at mx.managers::LayoutManager/validateDisplayList()[C:\autobuild\3.3.0\frameworks\projects\framework\src\mx\managers\LayoutManager.as:622]
at mx.managers::LayoutManager/doPhasedInstantiation()[C:\autobuild\3.3.0\frameworks\projects\framework\src\mx\managers\LayoutManager.as:677]
at Function/http://adobe.com/AS3/2006/builtin::apply()
at mx.core::UIComponent/callLaterDispatcher2()[C:\autobuild\3.3.0\frameworks\projects\framework\src\mx\core\UIComponent.as:8633]
at mx.core::UIComponent/callLaterDispatcher()[C:\autobuild\3.3.0\frameworks\projects\framework\src\mx\core\UIComponent.as:8573]

By: Graham Odds

Graham Odds — Tue, 19 May 2009 14:26:18 +0000

Hi Pat, Here is a link to the source code. I've added a link to it in the article as well. I noticed that there was a code snippet missing as well so I have reintroduced it. Hope that provides all the information you are after. Graham

By: Patrick Whittingham

Patrick Whittingham — Tue, 19 May 2009 14:11:16 +0000

Can you provide the code for the 2 line charts so I can compare the differences.

Thanks,
Pat

By: Graham Odds

Graham Odds — Wed, 06 May 2009 11:20:39 +0000

Hi Sayali, This is a known bug. The bug report includes a workaround in its comments. I hope this solves your problem. Graham

By: Sayali

Sayali — Mon, 04 May 2009 12:02:54 +0000

For Area Series when filterData property is set to false.. it gives run time error and doesn’t render the chart.. what should be done for that? because items array of areasSeries shows only non-null values.. what if i want all values in items array including all nulls..

Any pointers would be highly appreciated…
Thanks in advance.