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.engine/src/org/eclipse/birt/chart/render/AxesRenderer.java
Axis ax;
		EList el;
		int iLineCount, iAxisCount = oaxa.length;
		MarkerLine ml;
		LineRenderEvent lre;
		DataElement deValue;
		AutoScale asc;
		double dCoordinate = 0;
		int iOrientation;
		final IDeviceRenderer idr = getDevice( );
		final ScriptHandler sh = getRunTimeContext( ).getScriptHandler( );
		final Location loStart = LocationImpl.create( 0, 0 );
		final Location loEnd = LocationImpl.create( 0, 0 );
		Anchor anc;
		Orientation or;
		TextRenderEvent tre = null;
		Label la = null;
		double dOriginalAngle = 0;
		final boolean bTransposed = ( (ChartWithAxes) getModel( ) ).isTransposed( );
		final PlotWithAxes pwa = (PlotWithAxes) getComputations( );
		final Bounds boText = BoundsImpl.create( 0, 0, 0, 0 );
		for ( int i = 0; i < iAxisCount; i++ )
		{
			ax = oaxa[i].getModelAxis( );
			iOrientation = ax.getOrientation( ).getValue( );
			if ( bTransposed ) 
			{
				iOrientation = ( iOrientation == Orientation.HORIZONTAL ) ? Orientation.VERTICAL
						: Orientation.HORIZONTAL;
			}