How can we represent missing data in a line chart? Right now our
requirements are to have missing data points at the beginning or end of the
series only but we're also curious how to have missing points in the middle.
We tried using null objects but that caused an error in the charts.
TypeError: Error #1009: Cannot access a property or method of a null object
reference.
at
mx.charts.chartClasses::Series/mx.charts.chartClasses:Series::cacheDefaultVa
lues()
at
mx.charts.series::LineSeries/mx.charts.series:LineSeries::updateData()
at
mx.charts.chartClasses::Series/mx.charts.chartClasses:Series::validateData()
at mx.charts.series::LineSeries/describeData()
at mx.charts.chartClasses::DataTransform/describeData()
at
mx.charts.chartClasses::AxisBase/mx.charts.chartClasses:AxisBase::describeDa
ta()
at mx.charts.chartClasses::NumericAxis/get
mx.charts.chartClasses:NumericAxis::dataDescriptions()
at mx.charts.chartClasses::NumericAxis/::autoGenerate()
at mx.charts.chartClasses::NumericAxis/::updateCache()
at mx.charts.chartClasses::NumericAxis/update()
at mx.charts.chartClasses::NumericAxis/getLabelEstimate()
at mx.charts::AxisRenderer/::measureLabels()
at mx.charts::AxisRenderer/::calcRotationAndSpacing()
at mx.charts::AxisRenderer/adjustGutters()
at mx.charts.chartClasses::CartesianChart/::updateAxisLayout()
at
mx.charts.chartClasses::CartesianChart/mx.charts.chartClasses:CartesianChart
::updateDisplayList()
at mx.core::UIComponent/validateDisplayList()
at mx.managers::LayoutManager/::validateDisplayList()
at mx.managers::LayoutManager/::doPhasedInstantiation()
at Function/http://adobe.com/AS3/2006/builtin::apply()
at mx.core::UIComponent/::callLaterDispatcher2()
at mx.core::UIComponent/::callLaterDispatcher()
We also tried using an XML element that doesn't have the attributes we've
assigned to our series or axis but that creates lines at zero, not missing.
Thanks,
Sam
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; layout="absolute">
<mx:Script>
<![CDATA[
private function getTestData():Array {
var x:XML = <stats>
<stat pat_time="0"
hr="140"
pao2_alv="38"
pao2_art="47" />
<stat pat_time="5"
hr="149"
pao2_alv="41"
pao2_art="42" />
<stat pat_time="10"
hr="112"
pao2_alv="15"
pao2_art="29" />
</stats>;
var a:Array = [
null,
null,
x.stat[0],
x.stat[1],
x.stat[2] ];
return a;
}
]]>
</mx:Script>
<mx:LineChart
id="waveform"
width="80%"
height="80%"
dataProvider="{getTestData()}">
<mx:horizontalAxis>
<mx:CategoryAxis
categoryField="@pat_time"
title="Patient Time" />
</mx:horizontalAxis>
<mx:series>
<mx:LineSeries yField="@hr" />
<mx:LineSeries yField="@pao2_alv" />
<mx:LineSeries yField="@pao2_art" />
</mx:series>
</mx:LineChart>
</mx:Application>
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