Bug 211773 Legend entries overlap
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/render/BaseRenderer.java
TextRenderEvent tre = (TextRenderEvent) ( (EventObjectCache) idr ).getEventObject( oSource,
				TextRenderEvent.class );
		if ( iTextRenderType != TextRenderEvent.RENDER_TEXT_IN_BLOCK )
		{
			tre.setTextPosition( Methods.getLabelPosition( lp ) );
			tre.setLocation( lo );
		}
		else
		{
			tre.setBlockBounds( bo );
			tre.setBlockAlignment( null );
		}
		tre.setLabel( laDataPoint );
		tre.setAction( iTextRenderType );
		if ( _dc == null )
		{
			dc.addLabel( tre );
		}
		else
		{
			_dc.addLabel( tre );
		}
	}
	
	/**
	 * This method validates the given datapoints.
	 */
	protected void validateNullDatapoint( DataPointHints[] dphs )
			throws ChartException
	{