How can I avoid "line breaking up" with line chart-JasperReport? - jasper-reports

Question

I am using Jaspersoft Studio version 6.3.0.final with JasperReports Library version 6.3.0 . I'm creating a Line chart with different series and category values. My question is that, when the graph is plotted, I observed that if for one category there are no values for a particular series, the line breaks and the line starts again from the next data point.
Is there anyway in which we can connect ALL the points in a particular series, so that it will be one continuous single line instead of broken lines and dots ?
I put an image as an example of what I get and I want to do and my .jrxml file for the line chart.
line chart example
<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="chart_subreport" pageWidth="842" pageHeight="595" columnWidth="842" leftMargin="0" rightMargin="0" topMargin="10" bottomMargin="10">
<style name="table 1_TH" mode="Opaque" backcolor="#646464" forecolor="#FFFFFF" >
<box>
<pen lineColor="#969696" lineWidth="1.0"/>
</box>
</style>
<field name="TimePoints" class="java.util.Date"/>
<field name="LongAxis" class="java.lang.Double"/>
<field name="Lesion" class="java.lang.String"/>
<detail>
<band height="400" >
<printWhenExpression><![CDATA[$V{REPORT_COUNT}==1]]></printWhenExpression>
<lineChart>
<chart>
<reportElement style="table 1_TH" x="10" y="0" width="800" height="400"/>
<chartTitle>
<titleExpression><![CDATA["Lesion's evolution"]]></titleExpression>
</chartTitle>
</chart>
<categoryDataset>
<categorySeries>
<!-- This is the lesions you want to see on charts-->
<seriesExpression><![CDATA[$F{Lesion}]]></seriesExpression>
<!--You can change the format date here -->
<categoryExpression><![CDATA[(new SimpleDateFormat("MMM d, yyyy")).format($F{TimePoints})]]></categoryExpression>
<valueExpression><![CDATA[$F{LongAxis}]]></valueExpression>
</categorySeries>
</categoryDataset>
<linePlot isShowLines="true">
<plot backcolor="#323232" />
<categoryAxisFormat>
<axisFormat/>
</categoryAxisFormat>
<valueAxisFormat>
<axisFormat >
<labelFont>
<font fontName="Arial" size="10"/>
</labelFont>
</axisFormat>
</valueAxisFormat>
</linePlot>
</lineChart>
</band>
</detail>
</jasperReport>

Answer 1

I achieved to get what I want, I've just changed the type of the chart, now I'm using "timeSeriesChart".
<style name="table 1_TH" mode="Opaque" backcolor="#646464" forecolor="#FFFFFF" >
<box>
<pen lineColor="#969696" lineWidth="1.0"/>
</box>
</style>
<queryString>
<![CDATA[]]>
</queryString>
<field name="TimePoints" class="java.util.Date"/>
<field name="LongAxis" class="java.lang.Double"/>
<field name="Lesion" class="java.lang.String"/>
<field name ="nbInstance" class="java.lang.Integer"/>
<detail>
<band height="400" >
<printWhenExpression><![CDATA[$V{REPORT_COUNT}==$F{nbInstance}]]></printWhenExpression>
<timeSeriesChart>
<chart>
<reportElement style="table 1_TH" x="10" y="0" width="800" height="400"/>
<chartTitle>
<titleExpression><![CDATA["Lesion's evolution"]]></titleExpression>
</chartTitle>
</chart>
<timeSeriesDataset>
<timeSeries>
<seriesExpression><![CDATA[$F{Lesion}]]></seriesExpression>
<timePeriodExpression> <![CDATA[$F{TimePoints}]]></timePeriodExpression>
<valueExpression><![CDATA[$F{LongAxis}]]></valueExpression>
</timeSeries>
</timeSeriesDataset>
<timeSeriesPlot >
<plot backcolor="#323232" />
<timeAxisLabelExpression/>
<timeAxisFormat>
<axisFormat/>
</timeAxisFormat>
<valueAxisLabelExpression/>
<valueAxisFormat>
<axisFormat/>
</valueAxisFormat>
</timeSeriesPlot>
</timeSeriesChart>
</band>
</detail>