Bug 206603 Table column is not rendered in pdf if its width is set in ems
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/PDFTableLM.java
/**
		 * get cell width
		 * 
		 * @param startColumn
		 * @param endColumn
		 * @return
		 */
		public int getCellWidth( int startColumn, int endColumn )
		{
			assert ( startColumn < endColumn );
			assert ( colWidth != null );
			int sum = 0;
			for ( int i = startColumn; i < endColumn; i++ )
			{
				sum += colWidth[i];
			}
			return sum;
		}
		protected int columnNumber;
		protected int tableWidth;
		/**
		 * Array of column width
		 */
		protected int[] colWidth = null;
		/**
		 * array of position for each column
		 */
		protected int[] xPositions = null;
	}
}