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/util/AttributeAdapterFactory.java
{
			return createColorDefinitionAdapter( );
		}
		public Object caseDataPoint( DataPoint object )
		{
			return createDataPointAdapter( );
		}
		public Object caseDataPointComponent( DataPointComponent object )
		{
			return createDataPointComponentAdapter( );
		}
		public Object caseDateFormatSpecifier( DateFormatSpecifier object )
		{
			return createDateFormatSpecifierAdapter( );
		}
		public Object caseExtendedProperty( ExtendedProperty object )
		{
			return createExtendedPropertyAdapter( );
		}
		public Object caseFill( Fill object )
		{
			return createFillAdapter( );
		}
		public Object caseFontDefinition( FontDefinition object )
		{
			return createFontDefinitionAdapter( );
		}
		public Object caseFormatSpecifier( FormatSpecifier object )
		{
			return createFormatSpecifierAdapter( );