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我有一個從SQL生成的折線圖，我需要根據值以不同的顏色繪製數據。 例如：綠色表示正值，紅色表示負值。基於使用JasperReports的折線圖中的值繪製不同顏色的點
我已經加入了JRXML內容，
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE jasperReport PUBLIC "//JasperReports//DTD Report Design//EN" "http://jasperreports.sourceforge.net/dtds/jasperreport.dtd">
<jasperReport
name="escalationTriggersDrilldown"
columnCount="1"
printOrder="Vertical"
orientation="Portrait"
pageWidth="500"
pageHeight="350"
columnWidth="500"
columnSpacing="0"
leftMargin="0"
rightMargin="0"
topMargin="0"
bottomMargin="0"
whenNoDataType="AllSectionsNoDetail"
isTitleNewPage="false"
isSummaryNewPage="false"
resourceBundle="conformus"
whenResourceMissingType="Key">
<property name="ireport.scriptlethandling" value="0" />
<property name="ireport.encoding" value="UTF-8" />
<import value="java.util.*" />
<import value="net.sf.jasperreports.engine.*" />
<import value="net.sf.jasperreports.engine.data.*" />
<parameter name="conName" isForPrompting="true" class="java.lang.String"/>
<parameter name="conId" isForPrompting="true" class="java.lang.String"/>
<parameter name="orgId" isForPrompting="true" class="java.lang.String"/>
<parameter name="chartName" isForPrompting="true" class="java.lang.String"/>
<parameter name="sql" isForPrompting="true" class="java.lang.String"/>
<parameter name="unit" isForPrompting="true" class="java.lang.String"/>
<parameter name="indicatorName" isForPrompting="true" class="java.lang.String"/>
<queryString><![CDATA[$P!{sql}]]></queryString>
<field name="INDICATOR_NAME" class="java.lang.String"/>
<field name="UNIT_OF_MEASURE" class="java.lang.String"/>
<field name="E_DATE" class="java.lang.String"/>
<field name="CALCULATED_VALUE" class="java.math.BigDecimal"/>
<field name="FLAG_VALUE" class="java.math.BigDecimal"/>
<summary>
<band height="350" isSplitAllowed="true" >
<lineChart>
<chart hyperlinkTarget="Self" >
<reportElement
x="0"
y="0"
width="500"
height="350"
key="element-1"/>
<box></box>
<chartTitle color="#000000" >
<font fontName="Trebuchet MS" pdfFontName="Helvetica" size="11" isBold="true" isItalic="false" isUnderline="false" isStrikeThrough="false" isPdfEmbedded="false" pdfEncoding="Cp1252"/>
<titleExpression><![CDATA[str($P{chartName})+" - "+$P{indicatorName}]]></titleExpression>
</chartTitle>
<chartLegend textColor="#000000" backgroundColor="#FFFFFF" >
</chartLegend>
</chart>
<categoryDataset>
<dataset >
</dataset>
<categorySeries>
<seriesExpression><![CDATA[$F{INDICATOR_NAME}]]></seriesExpression>
<categoryExpression><![CDATA[$F{E_DATE}]]></categoryExpression>
<valueExpression><![CDATA[$F{CALCULATED_VALUE}]]></valueExpression>
<itemHyperlink hyperlinkType="Reference">
<hyperlinkTooltipExpression><![CDATA[""+$F{CALCULATED_VALUE}]]></hyperlinkTooltipExpression>
</itemHyperlink>
</categorySeries>
</categoryDataset>
<linePlot >
<plot />
<categoryAxisFormat>
<axisFormat >
</axisFormat>
</categoryAxisFormat>
<valueAxisLabelExpression><![CDATA[$P{unit}]]></valueAxisLabelExpression>
<valueAxisFormat>
<axisFormat >
<labelFont>
<font fontName="Trebuchet MS" pdfFontName="Helvetica" size="10" isBold="true" isItalic="false" isUnderline="false" isStrikeThrough="false" isPdfEmbedded="false" pdfEncoding="Cp1252"/>
</labelFont>
<tickLabelFont>
</tickLabelFont>
</axisFormat>
</valueAxisFormat>
</linePlot>
</lineChart>
</band>
</summary>
</jasperReport>