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.ui.extension/src/org/eclipse/birt/chart/ui/swt/composites/FillChooserComposite.java
gc.setForeground( cWhite );
					gc.drawRectangle( iC * iCellWidth + 1,
							iR * iCellHeight + 1,
							iCellWidth - 3,
							iCellHeight - 3 );
					gc.setForeground( cBlack );
				}
			}
		}
		cBlack.dispose( );
		cWhite.dispose( );
		gc.dispose( );
	}
	/**
	 * This method assumes a color array of 40 color arranged with equal sizes
	 * in a 8x5 grid.
	 * 
	 * @param x
	 * @param y
	 */
	public Color getColorAt( int x, int y )
	{
		int iCellWidth = this.getSize( ).x / 8;
		int iCellHeight = this.getSize( ).y / 5;
		int iHCell = x / iCellWidth;
		int iVCell = y / iCellHeight;
		int iArrayIndex = ( ( iVCell ) * 8 ) + iHCell;
		return this.colorMap[iArrayIndex];
	}
}