Bug 198031 Legend interactivity does not work correctly for drill-throughs
Under Value (Y) Series enable interactivity for the event "Mouse Click" Set action to Hyperlink The type of the hyperlink is Drill-through and the target is the a sub-report Pass parameter to sub-report as row["value_of_the_legend_item"] Suppose there are 3 values, x,y and z No matter which legend item you click (x, y or z), z gets passed as param to the subreport
chart/org.eclipse.birt.chart.reportitem.ui/src/org/eclipse/birt/chart/reportitem/ui/ChartReportItemBuilderImpl.java
if ( sFromUnits == null || sToUnits == null )
		{
			return dOriginalValue;
		}
		double dResult = -1d;
		
		final IDisplayServer ids = ChartUIUtil.getDisplayServer( );
		if ( sFromUnits.equalsIgnoreCase( "pixels" ) ) 
		{
			dOriginalValue = ( dOriginalValue * 72d ) / ids.getDpiResolution( );
		}
		
		
		dResult = ( DimensionUtil.convertTo( dOriginalValue,
				getBIRTUnitsFor( sFromUnits ),
				getBIRTUnitsFor( sToUnits ) ) ).getMeasure( );
		
		if ( sToUnits.equalsIgnoreCase( "pixels" ) ) 
		{
			dResult = ( ids.getDpiResolution( ) * dResult ) / 72d;
		}
		return dResult;
	}
	/**
	 * @param sUnits
	 */
	private static String getBIRTUnitsFor( String sUnits )
	{
		if ( sUnits.equalsIgnoreCase( "inches" ) ) 
		{