Geoscience Reference
In-Depth Information
Contrary to classical graphical widgets (the traditional menubar, palettes,
docks, etc.), this technique does not force users to point at small elements:
interaction can be performed away from the place where the menu is dis-
played. Occlusion, accuracy and reachability concerns (which were pre-
sented above) thus vanish. Moreover, it was shown that users can quickly
learn the association between FC shortcuts and the corresponding features
(Bailly et al. 2010), a feature that is useful for non-technical experts and
necessary during time crisis.
Figure 4:
Performing a simple command
Navigational Tasks. FC shortcuts do not conflict with common panning,
zooming and rotating gestures. Panning only requires one finger and
zooming/rotating operations in fact corresponds to the specific FC short-
cut, where one finger is used for each hand. As a consequence, zoom-
ing/rotating corresponds to the first item of the first menu of the menubar,
as shown in
Figure 5
. In other words, FC shortcuts do not break habits and
provide a general framework for associating gestures to menu items.
Figure 5
Zooming in QGIS-MT
Number of commands
. As the system just counts the number of fingers in
each hand, the technique provides 5x5=25 items in a two-level hierarchical
menu (such as a menubar and the associated pull down menus). This number
can be increased in two different ways. First, menu items can still be selected
in the usual way, just by clicking on them. As for desktop applications,
