Since 24th May 2010 you have had the ability to adjust your graphs interactively. Currently the Bar chart, Line chart, Progress Bar, Rose chart and the Tradar have this facility. Some graph types use multiple event handlers and as such are unlikely to work well with other dynamic features. The Line chart is an example of this, and whilst it does work with the context menu (and so the full canvas zoom), it is unlikely to work with other dynamic features.
At the current time this feature on the Bar and Line charts don't work with X axis in the center.
If your intention is to make some sort of interactive console, new HTML5 input types may also be of interest (for example the new range input type which gives you a "slider bar"). Eg (Chrome/Safari/Opera):