Bug 212291 SWT Chart render engine always uses 96 DPI(Display) resolution
chart/org.eclipse.birt.chart.device.swt/src/org/eclipse/birt/chart/device/swt/SwtRendererImpl.java
pattern.dispose( );
		img.dispose( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.event.IPrimitiveRenderer#enableInteraction(org.eclipse.birt.chart.event.InteractionEvent)
	 */
	public void enableInteraction( InteractionEvent iev ) throws ChartException
	{
		if ( _iun == null )
		{
			logger.log( ILogger.INFORMATION,
					Messages.getString( "SwtRendererImpl.exception.missing.component.interaction", getULocale( ) ) ); 
			return;
		}
		final Trigger[] tga = iev.getTriggers( );
		if ( tga == null )
		{
			return;
		}
		Region clipping = new Region( );
		_gc.getClipping( clipping );
		
		TriggerCondition tc;
		ArrayList al;
		final PrimitiveRenderEvent pre = iev.getHotSpot( );
		if ( pre instanceof PolygonRenderEvent )
		{
			final Location[] loa = ( (PolygonRenderEvent) pre ).getPoints( );