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
import org.eclipse.birt.chart.model.data.impl.NumberDataElementImpl;
import org.eclipse.birt.chart.model.layout.Block;
import org.eclipse.birt.chart.model.layout.ClientArea;
import org.eclipse.birt.chart.model.layout.LabelBlock;
import org.eclipse.birt.chart.model.layout.Legend;
import org.eclipse.birt.chart.model.layout.Plot;
import org.eclipse.birt.chart.model.layout.TitleBlock;
import org.eclipse.birt.chart.plugin.ChartEnginePlugin;
import org.eclipse.birt.chart.util.CDateTime;
import org.eclipse.birt.chart.util.ChartUtil;
import org.eclipse.birt.chart.util.Lowess;
import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.ecore.util.EcoreUtil;
/**
 * Provides a base framework for custom series rendering extensions that are
 * interested in being rendered in a pre-computed plot containing axes. Series
 * type extensions could subclass this class to participate in the axes
 * rendering framework.
 */
public abstract class AxesRenderer extends BaseRenderer
{
	private static ILogger logger = Logger.getLogger( "org.eclipse.birt.chart.engine/render" ); 
	private Axis ax;
	private Engine3D engine;
	private boolean leftWallFill = false;
	private boolean rightWallFill = false;
	private boolean floorFill = false;
	/**
	 * The constructor.
	 */