Bug 104986 Backgound image uses an absolute path
Currently Chart uses an absolute path to indicate a backgournd image, that may cause the design unusable on other environments. Expected the background image can be definded in multiple ways like in report designer. e.g. URI(absolute path), File(relative path), Embedded Image(Encoded Image Data).
chart/org.eclipse.birt.chart.device.extension/src/org/eclipse/birt/chart/device/swing/SwingRendererImpl.java
{
	/**
	 * KEY = TRIGGER_CONDITION VAL = COLLECTION OF SHAPE-ACTION INSTANCES
	 */
	private final LinkedHashMap _lhmAllTriggers = new LinkedHashMap( );
	private final Hashtable _htLineStyles = new Hashtable( );
	protected Graphics2D _g2d;
	protected IDisplayServer _ids;
	private IUpdateNotifier _iun = null;
	private SwingEventHandler _eh = null;
	private static ILogger logger = Logger.getLogger( "org.eclipse.birt.chart.device.extension/swing" ); 
	/**
	 * The constructor.
	 */
	public SwingRendererImpl( )
	{
		final PluginSettings ps = PluginSettings.instance( );
		try
		{
			_ids = ps.getDisplayServer( "ds.SWING" ); 
		}
		catch ( ChartException pex )
		{
			logger.log( pex );
		}