Setting Marker Line based on Date Parameter

JasonW

Charts with date time axis use com.ibm.icu.util.Calendar. Date time parameters use java.util.Date. This example shows a report that has a date time parameter which is compared to the values of a date axis and used to add a marker line.

function afterDataSetFilled( series, dataSet, icsc )
{
  importPackage(Packages.org.eclipse.birt.chart.model.attribute.impl);
  importPackage(Packages.com.ibm.icu.util);
  //x-axis Series
	 if (series.eClass().getName().equals("Series"))
	 {
     var list = dataSet.getValues();
   
     for ( i=0; i     {
      var cdt = icsc.getExternalContext().getScriptable().getParameterValue("myDtParm");
      
      var yr = list[i].fieldDifference( cdt, Calendar.YEAR );
      var mn = list[i].fieldDifference( cdt, Calendar.MONTH );
      var dy = list[i].fieldDifference( cdt, Calendar.DATE );
      if( yr == 0 && mn == 0 && dy == 0){
       intcountformaker = i;
      }
     }
    }
}

<br />
The afterDateSetFilled event is fired for every runtime series. This includes the category axis.<br />
So this line:<br />
series.eClass().getName().equals("Series")<br />
will be true for the category series. Use "BarSeries", "LineSeries" etc for others or use getSeriesIdentifier()<br />
This line:

icsc.getExternalContext().getScriptable().getParameterValue("myDtParm");

<br />
Gets the report parameter which is compared to each of the x-axis values using a the fieldDifference method of the Calendar class. When a match is found the intcountformaker global variable is set.<br />
We then just dynamically create the marker in the beforeGeneration event which is called after the afterDataSetFilled event.

function beforeGeneration( chart, icsc )
{
 importPackage(Packages.org.eclipse.birt.chart.model.component.impl);
 importPackage(Packages.org.eclipse.birt.chart.model.data.impl);
 importPackage(Packages.org.eclipse.birt.chart.model.attribute);
 importPackage(Packages.org.eclipse.birt.chart.model.attribute.impl);
 var xAxis =chart.getAxes().get(0);
 target_ml = MarkerLineImpl.create(xAxis, NumberDataElementImpl.create(intcountformaker));
 target_ml.getLabel().getCaption().setValue("Target");
 target_ml.getLineAttributes().getColor().set(32,145,245);
}