http:^^www.cs.wisc.edu^~devise^devise^visualquery.html

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<UL>
<LI>Press number 4, 6, 8, or 2 to scroll view left, right, up, or down.
Numbers correspond to arrows on a numeric keypad with NumLock on.
<LI>Press number 7 or 9 to zoom in or out of a view in the X direction.
<LI>Press number 1 or 3 to zoom in or out of a view in the Y direction.
<LI>Press s to toggle symbol display on or off.
<LI>Press v to toggle connector display on or off.
</UL>

<A name="History"><H3>History Window</H3></A>

<!WA28><!WA28><!WA28><img src="http://www.cs.wisc.edu/~devise/devise/history.gif" align=middle>

<P>The history window is accessed by clicking the `history' button
on the control panel. A history of changes to the visual filter
of the current view are displayed.

<P>Users can go back to places previously visited by clicking in a
history window entry, and then clicking the `use' button on the
control panel.  Users can also mark or unmark places of interest by
clicking in the `mark' column of the history window. The marked
entries are preceded by an `*'. Because the history window has a
finite size, old history entries are replaced by new ones after the
size of the history window reaches it maximum. However, marked entries
are never replaced.

<A name="VisualLink"><H3>Visual Link</H3></A>

Visual links are used to link the axes of multiple views, so that
scrolling or zooming one synchronously scrolls or zooms all linked
views. The ``View/Link'' menu brings up a dialog box that allows the
user to select a link for the current view. The dialog box also allows
the user to create new links, and to examine views that belong to
existing links. The ``View/Unlink'' menu allows the user to dissociate
a view from a link.

<A name="Cursor"><H3>Cursor</H3></A>

Click here for an <!WA29><!WA29><!WA29><A href="http://www.cs.wisc.edu/~devise/devise/soil.html">example</A>.

<P>Cursors are used to display the boundaries of one view relative to
another. Clicking in the destination view moves the cursor to the
clicked region, at the same time changing the visual filter of the
source view. The cursor menu is used to access cursors:

<UL>
<LI>Create: creates a cursor.
<LI>Delete: deletes a cursor.
<LI>Set source: Set the source view for the cursor.
<LI>Set destination: Set the destination view for the cursor.
</UL>

<A name="Switch"><H3>Switch TData</H3></A>

As the user experiments with the mapping of a GData, and navigates
through scrolling or zooming, the user might come across a location of
interest in the data. there are cases where the user wants to see what
the same location looks like for a different set of input data. The is
accomplished through the ``View/Switch TData'' menu command.  this is
a time save by eliminating the need to use the <!WA30><!WA30><!WA30><a
href="#DefineMapping">mapping definition</A> again, when the only
difference is that a different input is being used.

<A name="Duplicate"><H3>Duplicate Window</H3></A>

Consider a window consisting of a set of linked views.  As the user
navigates the views, he or she might come across a location of
interest. One way to save this location is to mark it in the <!WA31><!WA31><!WA31><A
href="#History">history window</A>. However, the user may also want to
compare two separate locations. This is most easily accomplished by
making a copy of the window so that the two may be placed side by side
for comparison. This is done by choosing the ``Window/Duplicate
Window'' menu command.

<P>After duplicating the window, the user is provided with two
identical windows. The user can use the first window as a reference
point, while using the second window for further navigation to find
other places of interest.

<A name="Query"><H3>Data Querying</H3></A>

As the user navigates the data, there might be places where
information about the records used to generate the graphics becomes
important for understanding. Pressing down on the middle button may be
used to query the data that underly the mouse. As a result, a pop-up
window appears, giving the user information about the data records,
including attribute names and values. (Click for an <!WA32><!WA32><!WA32><A
href="http://www.cs.wisc.edu/~devise/devise/program.html">example</A>) In the event that there is too much
information to fit in a pop-up window, the information is displayed
textually on the user's terminal.

<A name="Where"><h2>Where to Place Graphics</H2></A>

Views and windows are the means through which the user decides to
place graphics. First, views can be removed from windows to reduce
clutter, or be moved to other windows for side by side comparison with
other views. These functions are accessed through the ``View/Remove
from Window'' and ``View/Bring Back to window'' menus. When placed
within the same window, the positions of views may also be swapped
using the ``View/Swap Position'' menu.

<P>Windows are responsible for arranging views inside their
boundaries.  Different placement strategies may be
implemented. Currently, DEVise offers three window layouts:
tiled/automatic, vertical, and horizontal. In addition, DEVise relies
on the window manager of particular implementations for moving a
window to a different locations on the display, for changing the size
of a window, or for turning the window into an icon.

<A name="Summary"><H2>Command Summary</H2></A>

<H3>Menus</H3>

There are five groups of menus: Session, Visualize, View, Cursor, and
Window. We now describe each one in turn, beginning with the Session
menu. Recall that the state of each <!WA33><!WA33><!WA33><A href="#Intro">visual query</A>
is a <!WA34><!WA34><!WA34><A href="#Session">session</A>. The session menu deals with
saving and restoring visual queries:

<UL>
<LI>Open: restore a previously saved visual query to its original state.
<LI>Open as template: Apply a previously saved visual query to a different
set of input data. The user selects the new input data when session is
restored.
<LI>Close: close current session.
<LI>Save: save session under the default name.
<LI>Save as: save session under a different name.
<LI>Save as Template: save visual query as a template.
<LI>Print: print contents of window or save as Postscript.
<LI>Quit: quit DEVise.
</UL>

<P>The ``Visualize'' Menu is used to manage data streams and define
visualizations. See <!WA35><!WA35><!WA35><A href="#DefineMapping">here</A> for more
information.

<P>The ``View'' menu is used to operate on views. Most of the menu
items require that the current view be specified by clicking in the
view with the left mouse button. The menu items are:

<UL>
<LI>Edit Mapping:<!WA36><!WA36><!WA36><A href="#EditMapping">edit mapping</A> for current view.
<LI><!WA37><!WA37><!WA37><A href="#Switch">Switch TData</A>: Apply the same mapping that 
creates the current view to a different input data.
<LI>Swap position: Swap the positions of the last two views selected as
current view.
<LI>Move to Window: Move current view to another window.
<LI>Remove from Window: Remove current view from its window.
<LI>Bring Back to Window: Bring back a view that was removed earlier.
<LI>Link: Select a <!WA38><!WA38><!WA38><A href="#Link">visual link</A> for current view.
<LI>Unlink: Remove current view from a <!WA39><!WA39><!WA39><A href="#Link">visual link</a>.
<LI>Toggle X Axis: toggle X axis display on/off.
<LI>Toggle Y Axis: toggle Y axis display on/off.
<LI>Toggle Statistics: toggle statistics display (min/max/avg) on/off.
<LI>Show KGraph: control Kiviat graph displays.
<LI>Title: set, edit, or delete view titles.
</UL>

<P>The ``Cursor'' menu is used to operate on <!WA40><!WA40><!WA40><A
href="#Cursor">cursors</A>:

<UL>
<LI>Create: create a cursor.
<LI>Delete: delete a cursor.
<LI>Set source: make the current view the source of the cursor.
<LI>Set destination: make the current view the destination of the cursor.
</UL>

<P>The ``Window'' menu operates on windows:

<UL>
<LI>Layout: change the layout of a window.
<LI>Remove: remove an empty window.
<LI><!WA41><!WA41><!WA41><A href="#Duplicate">Duplicate</A>: Make a copy of current window.
<LI>Help: Open up the help window to display online documentation.
<LI>History: Open up the history window.
</UL>

<H3>Widgets</H3>

<P>The <!WA42><!WA42><!WA42><A href="#Control">control panel</A> widgets are as follows:

<UL>
<LI>mode button: toggle between layout and display modes.
Current View widget: displays the name of the current view.
<LI>xlow, xhigh, ylow, and yhigh: Displays the boundaries
	of the current view. The widgets may be edited.
<LI>use: makes the edited xlow/xhigh/ylow/yhigh the new visual
	filter for the current view.
<LI>undo-edit: undo the editing of the xlow/xhigh/ylow/yhigh widgets.
<LI>back one: move back to the previous visual filter by changing
	xlow/xhigh/ylow/yhigh widgets. The user has to click `use' to
	initiate the changes.
<LI>history: bring up the history window.
<LI>navigations buttons on the lower left: for scrolling
	left, right, up, down, zoom in X, zoom in Y, zoom out X,
	and zoom out Y.
</UL>

The <!WA43><!WA43><!WA43><A href="#History">history window</A> widgets are as follows:
<UL>
<LI>mark: toggles an entry between marked and unmarked state. In the
	marked state, the entry is never thrown away as the history buffer
	fills up.
<LI>xlow/xhigh/ylow/yhigh: click here to transfer this
	entry of the history window to the xlow/xhigh/ylow/yhigh
	widgets on the control panel. Then Click `use' on the control panel to
	go back to this history entry.
<LI>close: close the history window.
</UL>

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