Geoscience Reference
In-Depth Information
Figure 7:
Selecting features in QGIS-MT
Multi-users
. Users can not only interact in turn but also simultaneously.
The latter case requires the system to detect which hands belong to the
same user. This is done in a simple way in our implementation, just by par-
titioning the surface into different areas, one for each hand of each partici-
pant (typically, 8 areas if 4 users are around the table). More sophisticated
schemes could also be used, through vision-based hand recognition or by
using dedicated hardware as with Diamond Touch tabletops.
4- Implementation: QGIS-MT
QGIS uses the Qt framework (qt.nokia.com) and provides a plug-in system
in C++ to extend its features. We thus developed a C++/Qt plug-in for
QGIS, called QGIS-MT (
Figure 8
).
Figure 8:
QGIS-MT environment architecture
