Instructions for Applets
This page explains how to use the applets and
scripts available on this web site.
The TrackApplet is used to review tracking data. It loads a
background image (if available) and some tracking data. Using the
controls available below the viewing area, you can review the tracking
data in many different formats, sort the data, and run simple queries.
Unfortunately, this applet is still under development so this page
will probably lag behind.
WARNING! The applet will begin to display the data before it has
finished loading. It will perform much better after all the data is
loaded. Also, there are no guarrantees on queries and sorting
performed before the loading has completed. The black dot in the
lower right corner will disappear when loading is complete.
The left panel is where the tracking data is "replayed." The right
panel displays information about the currently displayed tracking
data. In some browsers, the InfoPanel will not update at the same
rate that the ViewPanel updates. The information displayed includes
the date, time, uniqueID, score (see Sorting Controls below),
The ViewPanel and InfoPanel
Although these controls are somewhat crude, they are similar to
standard VCR controls. Dragging the slider will allow you to quickly
review the tracking data.
- "|<" Rewind to first frame or first sequence.
- "<<" Skip to the beginning of the previous sequence.
- "<" Play backward.
- "0" Stop.
- ">" Play forward.
- ">>" Skip to the beginning of the next sequence.
- ">!" Full forward to the end of the last frame or sequence.
The three choice boxes determine the representation of the object
which is drawn, where that object is drawn, and what is used as the
background, respectively. The casual user will be best served by
using the mode button to select from a number of preset drawing
Drawing Mode Selection
The left choice box allows you to sort the data. In "FrmByFrm" mode
the data is played back in chronological order. The other modes order
each tracking sequences and allow them to be played back in that
order. The filter button filters out tracking sequences which
are extremely short or don't move anywhere on the screen. The
find button returns the the last object that was clicked by the
user. The query button is not fully functional. Currently it
orders the objects based on their similarity in color to the selected
Applet Sorting and Querying Controls
I apologize for the lack of intuitive interface. Unfortunately, this
is not at the top of our "things to do" list at this point. We'll do
our best to put the new tools on the page as they become available.