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POHow to create a method to calculate and set the interval of a chart
 

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  1. POHow to create a method to calculate and set the interval of a chart
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    <p>I am learning flex. And I need your help, I want to create a method to calculate the interval value of the vertical axis depending on the values of the "dataProvider".</p> <pre><code> &lt;mx:verticalAxis&gt; &lt;mx:LinearAxis labelFunction="usageColumnSerieLabelFn" interval="0.0001"/&gt; &lt;/mx:verticalAxis&gt; </code></pre> <p>Like you see, in that piece of code, I am hardcoding the interval. like I said, I want your help in order to create a new method to calculate and set this value.</p> <p>I believe, If we took the greater value in the "dataProvider" and then set this value (greater Value + 0.1) to the interval. Will do the trick. But I dont know how to set the properties outside the mx:LinearAxis component.</p> <p>I made this example, please if you have time, please give me a hand.</p> <p>Regards</p> <pre><code>&lt;?xml version="1.0"?&gt; &lt;!-- charts/BasicColumn.mxml --&gt; &lt;mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"&gt; &lt;mx:Script&gt;&lt;![CDATA[ import mx.collections.ArrayCollection; import flash.external.ExternalInterface; import mx.charts.HitData; import mx.formatters.SwitchSymbolFormatter; import mx.charts.series.items.LineSeriesItem; import mx.charts.HitData; import mx.formatters.NumberFormatter; import mx.core.UIComponent; import mx.effects.easing.Bounce; import mx.managers.PopUpManager; private var decimalFormatter:NumberFormatter = new NumberFormatter(); [Bindable] public var expenses:ArrayCollection = new ArrayCollection([ {hour:"00", Expenses:0.0}, {hour:"01", Expenses:0.0}, {hour:"02", Expenses:0.0}, {hour:"03", Expenses:0.0}, {hour:"04", Expenses:0.0}, {hour:"05", Expenses:0.0}, {hour:"06", Expenses:0.0}, {hour:"07", Expenses:0.0}, {hour:"08", Expenses:0.0}, {hour:"09", Expenses:0.0}, {hour:"10", Expenses:0.00009}, {hour:"11", Expenses:0.00009}, {hour:"12", Expenses:0.0}, {hour:"13", Expenses:0.0}, {hour:"14", Expenses:0.0}, {hour:"15", Expenses:0.0}, {hour:"16", Expenses:0.0}, {hour:"17", Expenses:0.0}, {hour:"18", Expenses:0.0}, {hour:"19", Expenses:0.0}, {hour:"20", Expenses:0.0}, {hour:"21", Expenses:0.0}, {hour:"22", Expenses:0.0}, {hour:"23", Expenses:0.00009} ]); private function customDataTipFunc(item:HitData):String{ decimalFormatter.precision = 4; var dataTip:String = ""; dataTip += "&lt;B&gt;kWh&lt;/B&gt;\n"; dataTip += item.item.hour + "\n"; if (item.item.Expenses == 0) { dataTip += decimalFormatter.format(item.item.Expenses).toString() + " kWh"; } else { if(item.item.Expenses &lt; 0.0001) { dataTip += "&amp;lt;0.0001 kWh"; } else { dataTip += decimalFormatter.format(item.item.Expenses).toString() + " kWh"; } } return dataTip; } public function axisLabelFn(cat:Object,pcat:Object,ax:LinearAxis):String{ var nf1:NumberFormatter = new NumberFormatter(); nf1.useThousandsSeparator = true; nf1.precision = 4; var tempNumber:Number = Number(cat.toString()); var out:String = "" if (tempNumber == 0) { out = nf1.format(cat) + " kWh"; }else { if (tempNumber &lt; 0.0001) { out = "&amp;lt;" + nf1.format(cat) + " kWh"; } else { out = nf1.format(cat) + " kWh"; } } //return nf1.format(cat) + " kWh"; return out; } ]]&gt;&lt;/mx:Script&gt; &lt;mx:Panel title="Column Chart Kwh" width="1200"&gt; &lt;mx:ColumnChart id="myChart" showDataTips="true" height="100%" width="100%" dataProvider="{expenses}" minHeight="150" dataTipFunction="customDataTipFunc"&gt; &lt;mx:horizontalAxis&gt; &lt;mx:CategoryAxis dataProvider="{expenses}" categoryField="hour" /&gt; &lt;/mx:horizontalAxis&gt; &lt;mx:verticalAxis&gt; &lt;mx:LinearAxis labelFunction="axisLabelFn" interval="0.0001"/&gt; &lt;/mx:verticalAxis&gt; &lt;mx:series&gt; &lt;mx:ColumnSeries xField="hour" yField="Expenses" displayName="Kwh" /&gt; &lt;/mx:series&gt; &lt;/mx:ColumnChart&gt; &lt;mx:Legend dataProvider="{myChart}"/&gt; &lt;/mx:Panel&gt; &lt;/mx:Application&gt; </code></pre>
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    1. COIf you do not want this to be done outside of the linear axis, then extend the linearaxis and set it there, use this customcomponent in place of the linear axis?
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      1. POHow to create a method to calculate and set the interval of a chart
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    2. COhmm.. I want to do this, outside of the linear axis. In a different function. I am reading about "ho to extend the linearaxis". But I am not sure how to do it. Thanks for the reply, but if you can give me an example, will be great! Thanks!
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