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/model/attribute/impl/AttributeFactoryImpl.java
public Rotation3D createRotation3D( )
	{
		Rotation3DImpl rotation3D = new Rotation3DImpl( );
		return rotation3D;
	}
	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public ScriptValue createScriptValue( )
	{
		ScriptValueImpl scriptValue = new ScriptValueImpl( );
		return scriptValue;
	}
	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public SeriesValue createSeriesValue( )
	{
		SeriesValueImpl seriesValue = new SeriesValueImpl( );
		return seriesValue;
	}
	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public Size createSize( )
	{
		SizeImpl size = new SizeImpl( );