Bug 211773 Legend entries overlap
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/LegendBuilder.java
double dFWidth = bb.getWidth( );
			double dFHeight = bb.getHeight( );
			double dDeltaWidth = legendData.insCa.getLeft( )
					+ dFWidth
					+ ( 3 * legendData.dItemHeight )
					/ 2
					+ legendData.insCa.getRight( );
			if ( dWidth + dDeltaWidth > legendData.dAvailableWidth )
			{
				
				dRowHeight = dHeight + legendData.dVerticalReservedSpace;
				if ( dExtraHeight + dRowHeight > legendData.dAvailableHeight
						+ legendData.dSafeSpacing )
				{
					dHeight = -legendData.dVerticalReservedSpace;
					columnList.clear( );
					
					
				}
				else
				{
					legendData.legendItems.addAll( columnList );
					columnList.clear( );
					dExtraHeight += dRowHeight;
					dHeight = dFHeight;
					dRealWidth = Math.max( dRealWidth, dWidth );
					dWidth = dDeltaWidth;
					columnList.add( new LegendItemHints( LEGEND_MINSLICE_ENTRY,
							new Point( dWidth - dDeltaWidth, dExtraHeight ),
							dFWidth,