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
}
				catch ( ChartException ex ) 
				
				{
					throw new ChartException( ChartEnginePlugin.ID,
							ChartException.RENDERING,
							ex );
				}
			}
		}
		finally
		{
			
			cre.setVertices( null );
			getDevice( ).setClip( cre );
		}
	}
	/**
	 * Renders all marker lines (and labels at requested positions) associated
	 * with every axis in the plot Note that marker lines are drawn immediately
	 * (not rendered as deferred) at the appropriate Z-order
	 * 
	 * @param oaxa
	 * @param boPlotClientArea
	 * 
	 * @throws RenderingException
	 */
	private final void renderMarkerLines( OneAxis[] oaxa,
			Bounds boPlotClientArea ) throws ChartException
	{