Here are some references to pie menus:
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"PIXIE: A New Approach to Graphical Man-Machine Communications";
by Wiseman, N. E., Lemke, H. U., and Hiles, J. O.;
Proceedings of 1969 CAD Conference Southhampton,
IEEE Conference Publication 51, p. 463.
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"Principles of Interactive Computer Graphics, 2nd. edition";
by Newman, W. M. and Sproull, R. F.;
McGraw-Hill, 1979, 1973.
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"The evaluation of an interaction technique based on
self-revelation, guidance and rehearsal";
by Kurtenbach, G.;
Ph.D. thesis, University of Toronto (1992).
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"Issues in Combining Marking and Direct Manipulation Techniques",
by Kurtenbach, G. and Buxton, W;
UIST, '91 Proceedings: ACM Press, 1991.
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"An Empirical Evaluation of some Articulatory and Cognitive
Aspects of Marking Menus";
by Kurtenback, Sellen, Buxton;
Journal HCI, January 1993.
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"The Limits of Expert Performance Using Hierarchic Marking Menus";
by Kurtenback, Buxton;
Proceedings of CHI '93.
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"HyperMark: Issuing commands by drawing marks in Hypercard";
by Kurtenbach, G. & Baudel, T.;
Proceedings of CHI '92 poster and short talks, 64.
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"A Taxonomy of See-Through Tools";
by Bier, Stone, Fishkin, Buxton, and Baudel.
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"The computer for the 21st century";
Weiser, Mark;
Scientific American, September 1991, volume 265, 3, 94-104.
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Java Pie Menus;
by Jason Hong, U.C. Berkeley;
free demo, documentation and source code in Java.
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Circle Menus;
by Greg Bronevetsky.
Free demo and Circle Menu User Trials
in public release over the interet.
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Asymetrix ToolBook
pie menus were implemented by
Paolo Tosolini.
The source code is available here:
piemnu30.zip,
pie2lang.zip.
He maintains a
list of publications,
and here's an interesting paper called
Time and gesture based interfaces, a test case: Shinjuku Guide.
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"Pie Menus for Windows";
by Carl Rollo;
Dr. Dobb's Journal, Nov., 1992, pp 30-39.
Now he also has published
Pie Menus for Java
on his web site, as well as the paper
"Pie on the Menu in Your Program";
by Rollo, C.;
ARGONAUTS: The Newsletter for the Amiga Developer/Entrepreneur,
Vol. 2, No. 2, published by Morning Star International.
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Bert Bos
has written an X11 piemenu widget, for the
Free Widget Foundation.
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"Tilting Operations for Small Screen Interfaces (Tech Note)" [pdf];
by Jun Rekimoto;
Sony Computer Science Laboratory Inc.
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"piewm",
the X11 pie menu window manager that
Don Hopkins enhanced to support pie menus.
Maintained by
Russell Nelson.
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Game Programming Gems 3
includes a chapter about pie menus written by Don Hopkins,
called "Natural Selection: The Evolution of Pie Menus".
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Pie Menu Video;
by Don Hopkins;
Instructional demo of ActiveX pie menus, and demos of
many different pie menus developed over the years.
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"The Design and Implementation of Pie Menus.";
by Don Hopkins;
Dr. Dobb's Journal, Dec. 1991,
lead article, user interface issue.
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"The Shape of PSIBER Space: PostScript Interactive Bug Eradication Routines";
by Don Hopkins;
Proc. 1989 Usenix Graphics Conference,
Monterey California.
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"A Comparative Analysis of Pie Menu Performance";
by Jack Callahan, Don Hopkins, Mark Weiser, and Ben Shneiderman;
Proc. CHI'88 conference, Washington D.C.
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"Designing to Facilitate Browsing: a Look Back at the
HyperTIES Workstation Browser";
by Ben Shneiderman, Catherine Plaisant, Rodrigo Botafogo,
Don Hopkins, and William Weiland;
Hypermedia, V3 #2, 1991.
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"Directional Selection is Easy as Pie Menus!";
by Don Hopkins;
;login: The Usenix Association Newsletter,
V12 #5, Sept. 1987.
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You may enjoy watching Bill Gates get
pied on a trip to Brussels.