Creating a linear gradient fill on a ColumnChart control’s column series in Flex

The following example shows how you can create a linear gradient fill for a ColumnSeries in Flex

<?xml version="1.0"?>

<!-- http://blog.flexexamples.com/2007/11/20/creating-a-linear-gradient-fill-on-a-columnchart-controls-column-series-in-flex/ -->

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"

        layout="vertical"

        verticalAlign="middle"

        backgroundColor="white">

    <mx:Script>

        <![CDATA[

            import mx.charts.chartClasses.IAxis;

            private function linearAxis_labelFunc(item:Object, prevValue:Object, axis:IAxis):String {

                return currencyFormatter.format(item);

            }

            private function categoryAxis_labelFunc(item:Object, prevValue:Object, axis:CategoryAxis, categoryItem:Object):String {

                var datNum:Number = Date.parse(item);

                var tempDate:Date = new Date(datNum);

                return dateFormatter.format(tempDate).toUpperCase();

        ]]>

    </mx:Script>

    <mx:DateFormatter id="dateFormatter" formatString="DD" />

    <mx:CurrencyFormatter id="currencyFormatter" precision="2" />

    <mx:XMLListCollection id="dp">

        <mx:source>

            <mx:XMLList>

                <quote date="8/1/2007" open="40.29" close="39.58" />

                <quote date="8/2/2007" open="39.4" close="39.52" />

                <quote date="8/3/2007" open="39.47" close="38.75" />

                <quote date="8/6/2007" open="38.71" close="39.38" />

                <quote date="8/7/2007" open="39.08" close="39.42" />

                <quote date="8/8/2007" open="39.61" close="40.23" />

                <quote date="8/9/2007" open="39.9" close="40.75" />

                <quote date="8/10/2007" open="41.3" close="41.06" />

                <quote date="8/13/2007" open="41" close="40.83" />

                <quote date="8/14/2007" open="41.01" close="40.41" />

                <quote date="8/15/2007" open="40.22" close="40.18" />

                <quote date="8/16/2007" open="39.83" close="39.96" />

                <quote date="8/17/2007" open="40.18" close="40.32" />

                <quote date="8/20/2007" open="40.55" close="40.74" />

                <quote date="8/21/2007" open="40.41" close="40.13" />

                <quote date="8/22/2007" open="40.4" close="40.77" />

                <quote date="8/23/2007" open="40.82" close="40.6" />

                <quote date="8/24/2007" open="40.5" close="40.41" />

                <quote date="8/27/2007" open="40.38" close="40.81" />

            </mx:XMLList>

        </mx:source>

    </mx:XMLListCollection>

    <mx:ColumnChart id="columnChart"

            showDataTips="true"

            dataProvider="{dp}"

            width="100%"

            height="100%">

        <!-- vertical axis -->

        <mx:verticalAxis>

            <mx:LinearAxis baseAtZero="false"

                    labelFunction="linearAxis_labelFunc" />

        </mx:verticalAxis>

        <!-- horizontal axis -->

        <mx:horizontalAxis>

            <mx:CategoryAxis id="ca"

                    categoryField="@date"

                    title="August 2007"

                    labelFunction="categoryAxis_labelFunc" />

        </mx:horizontalAxis>

        <!-- horizontal axis renderer -->

        <mx:horizontalAxisRenderers>

            <mx:AxisRenderer axis="{ca}"

                    canDropLabels="true" />

        </mx:horizontalAxisRenderers>

        <!-- series -->

        <mx:series>

            <mx:ColumnSeries displayName="Open"

                    xField="@date"

                    yField="@open">

                <mx:fill>

                    <mx:LinearGradient id="linearGradient">

                        <mx:entries>

                            <mx:Array>

                                <mx:GradientEntry color="red"

                                        ratio="0.0"

                                        alpha="1.0" />

                                <mx:GradientEntry color="black"

                                        ratio="1.0"

                            </mx:Array>

                        </mx:entries>

                    </mx:LinearGradient>

                </mx:fill>

            </mx:ColumnSeries>

        </mx:series>

        <!-- series filters -->

        <mx:seriesFilters>

            <mx:Array />

        </mx:seriesFilters>

    </mx:ColumnChart>

</mx:Application>

    本文转自 OldHawk  博客园博客，原文链接：http://www.cnblogs.com/taobataoma/archive/2008/01/13/1037058.html，如需转载请自行联系原作者