Our serial chart supports a lot of graph types: line, area, smoothed line, step, column, candlestick, OHLC. All these types can go together in one chart - line with columns, columns with smoothed lines and similar. The real difference of these graphs is one property - type, except candlestick and OHLC graphs, of course, as they require 4 data fields instead of one.
It's quite common that a line or column outline changes to dashed line/outline for the date which is not available yet, but could be forecast. It's very easy to do this with our charts. You simply set dashLengthField for your graph and then set the dash length in your data, at a point where graph should become dashed.