Bug 197585 URL Link error in Line-Chart output in PDF format
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/PDFImageLM.java
*            the url string
	 * @return the bookmark name.
	 */
	private String getBookmark( String url )
	{
		int start = url.indexOf( BOOKMARK_PREFIX ) + BOOKMARK_PREFIX.length( );
		int end = url.length( ) - 2;
		return url.substring( start, end );
	}
	/**
	 * Parse the image map postion from a string which is of format "x1, y1, x2,
	 * y2".
	 * 
	 * @param string
	 *            the postion string.
	 * @return a array which contains the x, y cordinate of left up corner,
	 *         width and hegiht in sequence.
	 * 
	 */
	private int[] getArea( String string )
	{
		String[] rawDatas = string.split( "," );
		int[] area = new int[4];
		area[0] = Integer.parseInt( rawDatas[0] );
		area[1] = Integer.parseInt( rawDatas[1] );
		area[2] = Integer.parseInt( rawDatas[4] ) - area[0];
		area[3] = Integer.parseInt( rawDatas[5] ) - area[1];
		return area;
	}
}