NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Hi, The paper http://citeseer.nj.nec.com/jacob99software.html might be of interest for those of you who do direct manip interfaces, as its ideas are very visad-compatible. Basically, expressions like "mouse_down AND some_value < 2" can trigger state changes inside an app-specific state transition diagram. It employs a data-flow network, where "routes", that is, flows of variables thru the network, are activated and deactivated depending on the current state. A simple example: if the above expression yields true, a state change is triggered, that activates a data-flow route from the mouse-position to some variables. I don't know if this is an old hat, but I think it's it very cool. Manuel
visad
archives: