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From "Royer Christophe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLEX-32649) NPE in AxisRenderer when stacked column chart has one data item
Date Thu, 19 Dec 2013 10:54:07 GMT

    [ https://issues.apache.org/jira/browse/FLEX-32649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13852802#comment-13852802
] 

Royer Christophe commented on FLEX-32649:
-----------------------------------------

A Workaround for this bug ?

I'm using LIneChart and I've same problem when displaying n series but all series have only
one data item.

> NPE in AxisRenderer when stacked column chart has one data item
> ---------------------------------------------------------------
>
>                 Key: FLEX-32649
>                 URL: https://issues.apache.org/jira/browse/FLEX-32649
>             Project: Apache Flex
>          Issue Type: Bug
>          Components: Charts
>    Affects Versions: Adobe Flex SDK Previous
>         Environment: Affected OS(s): All OS Platforms
> Language Found: English
>            Reporter: Adobe JIRA
>            Assignee: Adobe JIRA
>            Priority: Minor
>
>       I have been unable to create a simple test-case that reproduces this error, but
I think a code inspection shows a problem. I've also been unable to get any help with a workaround
on the Adobe forums or flexcoders.
> The error is a null pointer exception when a stacked column chart has a single data item.
> In AxisRenderer.as (line 2200 in sdk3.3) we find a reference to "lastLabel" which will
be null if there is only one label, because it is computed as _labels[1].
> Excerpt from AxisRenderer.calcStaggeredSpacing:
>  
>         lastLabel = _labels[1];
>  
>         if (adjustable.left == false)
>         {
>             staggeredScale = Math.min(
>                 staggeredScale,
>                 staggeredleftGutter / (firstLabel.width / 2));             
>         }
>  
>         if (adjustable.right == false)
>         {
>             staggeredScale = Math.min(
>                 staggeredScale,
>                 staggeredrightGutter / (lastLabel.width / 2));      // (me) Here's where
the NPE occurs.       
>         }
>  
> Stack Crawl:
> __________
>  
> TypeError: Error #1009: Cannot access a property or method of a null object reference.
>     at mx.charts::AxisRenderer/calcStaggeredSpacing()[C:\work\flex\dmv_automation\proj
ects\datavisualisation\src\mx\charts\AxisRenderer.as:2200]
>     at mx.charts::AxisRenderer/calcRotationAndSpacing()[C:\work\flex\dmv_automation\pr
ojects\datavisualisation\src\mx\charts\AxisRenderer.as:1591]
>     at mx.charts::AxisRenderer/adjustGutters()[C:\work\flex\dmv_automation\projects\da
tavisualisation\src\mx\charts\AxisRenderer.as:1331]
>     at mx.charts::AxisRenderer/set gutters()[C:\work\flex\dmv_automation\projects\datavisualisation\src\mx\charts\
AxisRenderer.as:803]
>     at mx.charts.chartClasses::CartesianChart/updateAxisLayout()[C:\work\flex\dmv_auto
mation\projects\datavisualisation\src\mx\charts\chartClasses\CartesianChart.as:2 032]
>     at mx.charts.chartClasses::CartesianChart/updateDisplayList()[C:\work\flex\dmv_aut
omation\projects\datavisualisation\src\mx\charts\chartClasses\CartesianChart.as: 1359]
>     at mx.core::UIComponent/validateDisplayList()[C:\autobuild\3.3.0\frameworks\projec
ts\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\framework
s\projects\framework\src\mx\managers\LayoutManager.as:695]
>     at Function/http://adobe.com/AS3/2006/builtin::apply()
>     at mx.core::UIComponent/callLaterDispatcher2()[C:\autobuild\3.3.0\frameworks\proje
cts\framework\src\mx\core\UIComponent.as:8633]
>     at mx.core::UIComponent/callLaterDispatcher()[C:\autobuild\3.3.0\frameworks\projec
ts\framework\src\mx\core\UIComponent.as:8573]
>  
> Context from AxisRenderer:
> (Note: the second branch of the if statement is executing, thus adjustment.bottom is
false which leads to the code path with the bug.)
>  
> public function set gutters(value:Rectangle):void
>     {
>         var correctedGutters:Rectangle = value;
>        
>         // This check will rarely succeed, because _gutters
>         // have been tweaked to represent placement.
>         if (_gutters &&
>             _gutters.left == correctedGutters.left &&
>             _gutters.right == correctedGutters.right &&
>             _gutters.top == correctedGutters.top &&
>             _gutters.bottom == correctedGutters.bottom)
>         {
>             _gutters = correctedGutters;
>             return;
>         }
>         else
>         {
>             adjustGutters(value,
>                 { left: false, top: false, right: false, bottom: false }); 
>         }      
>     }
>  
>  
> I am building the series list dynamically, it's a stacked column chart, and for me the
bug occurs when there is one series and one data point.
> I haven't been able to trigger the bug with the following example, which has a similar
structure to my actual code.
>  
> <?xml version="1.0" encoding="utf-8"?>
> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical"  xmlns:local="*">
>  
> <mx:Script>
>     <![CDATA[
>         import mx.charts.series.ColumnSeries;
>         import mx.charts.chartClasses.Series;
>  
>         [Bindable]
>         public var seriesList:Array = [];        
>        
>         public function buildSeriesList(seriesList:Array):Array {
>    
>             var chartSeries:Array = new Array();
>            
>             var index:int = 0;
>             for each (var series:Object in seriesList) {
>                
>                         var columnSeries:ColumnSeries = new ColumnSeries();
>                         columnSeries.dataProvider = series.items;
>                         columnSeries.dataFunction = myDataFunction;
>                         columnSeries.displayName = series.category;
>                         chartSeries.push( columnSeries );
>             }
>             return chartSeries;
>         }
>  
>             private function categoryProvider(seriesList:Array):Array {
>                 if (seriesList && seriesList.length > 0)
>                     return (seriesList[0]).items;
>                 return null;
>             }
>        
>             private function myDataFunction(series:Series, item:Object, fieldName:String):Object
{
>                 if(fieldName == "yValue") {
>                     return item.value;
>                 }
>                 else if(fieldName == "xValue") {
>                     return item.category;
>                 }
>                 else
>                     return null;
>               }
>  
>                  public function shortCategoryLabel(source:String):String {
>                     
>                     return source;
>                  }
>  
>                  public function longCategoryLabel(source:String):String {
>                     
>                     return source;
>                  }
>              
>               private function onRefresh(event:Event):void {
>                     this.seriesList = [ { category: "cat1" , items: [ { category: "Default
Business Unit", value:574.1 }] }];
>               }
>        
>     ]]
>       >
> </mx:Script>
>  
>     <mx:Button label="Refresh" click="onRefresh(event)" />
>    
>     <mx:ColumnChart height="100%"
>             width="100%" type="stacked" series="{this.buildSeriesList(this.seriesList)}">
>    
>                 <mx:horizontalAxis>
>                     <mx:CategoryAxis id="bottomAxis2" title="Horizontal Axis"
>                         dataProvider="{this.categoryProvider(this.seriesList)}"
>                         categoryField="category" 
>                         />
>                 </mx:horizontalAxis>
>     
>                  <mx:verticalAxis>
>                     <mx:LinearAxis id="leftAxis2" title="Vertical Axis"/>
>                 </mx:verticalAxis>
>  
>              <mx:verticalAxisRenderers>
>                 <mx:AxisRenderer
>                     placement="left" styleName="verticalAxisRenderer"
>                     axis="{leftAxis2}"  verticalAxisTitleAlignment="vertical"
>                     />
>             </mx:verticalAxisRenderers>
>  
>                 <mx:horizontalAxisRenderers>
>                     <mx:AxisRenderer
>                         placement="bottom"
>                         axis="{bottomAxis2}"  verticalAxisTitleAlignment="flippedVertical"
>                         >
>                     </mx:AxisRenderer>
>                 </mx:horizontalAxisRenderers>            
>                
>     </mx:ColumnChart>
>  
>    
> </mx:Application>
>     



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