Pie Menus in SDI by Mark Weiser
Demonstration of Mark Weiser's Pie Menus implementation for his
classic game SDI for SunView, written while snowed in at home in 1987.
https://youtu.be/WTtEPbIE10I?t=42s

While snowed in with his Sun workstation at home during January
1987, Mark Weiser implemented pie menus for Sunview. He used the
Sunview pie menus for his classic "SDI" game.

Date: Fri, 23 Jan 87 20:12:37 EST
From: mark@markssun.cs.umd.edu (Mark Weiser)
To: don@mimsy.umd.edu
Subject: pies in sunview

I used the snow to hack pies into sunview. It works now without
walking menus. Will have walking over the weekend.

-mark

From: mark@mimsy.umd.edu
Subject: pie menus in suntools
Date: 26 January 1987 at 00:09:26 CET
To: callahan@brillig.umd.edu, chris@brillig.umd.edu, don@brillig.umd.edu, steve@brillig.umd.edu

I integrated pie menus into a version of suntools(.c), so they are used
for all the background menus.  Its running as the standard suntools on
markshome right now.

The method was to completely emulate all the standard sun menu library
calls so the source of suntools.c did not change at all. Just a relink
does it.  I used walkmenu.h to hold all the local information as well,
so some of the standard menu calls still will work with these (like
menu_get(CLIENT_DATA)) But--I only emulated those calls and options
used by  suntools, so it is not a general library replacement.

It still needs tuning to make the menus really look good, and for some
mouse click response glitches, but basically its all in.

Now the pie paper has two implementation data points, and I'll get back
to work on it.  

-mark

From: mark@mimsy.umd.edu
Subject: sunview pies
Date: 30 January 1987 at 06:24:27 CET
To: don@brillig.umd.edu, steve@brillig.umd.edu

images work.
-mark

From: mark@mimsy.umd.edu
Subject: pie tester in sunview
Date: 30 January 1987 at 07:07:49 CET
To: chris@brillig.umd.edu, don@brillig.umd.edu, steve@brillig.umd.edu

markssun:~mark/pie/test is the binary for a little pies in sunview
tester.  You just hand it a bunch of arguments and it makes a pie
menu out of them.  It takes your last item, and makes it arbitrarily
makes it a submenu pointing to another copy of the original menu
(to a depth of 5).

Items are selected by clicking down/up on them.

Any argument to 'test' which ends in '.icon' is assumed to be
the name of an image file in icon format.  Otherwise the string
itself is used as the argument.

Current bugs:
1. sometimes it doesn't notice the selection until you move the mouse
slightly.
2. whena submenu is deselected (by clicking on the null middle region)
the submenu does not go away (it just becomes overlaid by the old parent
and is no longer active).

Both of these bugs seem to be strange sunview things that I have not
yet discovered workarounds for.

I do have a suntools.c which uses pies, but it seems to only work with 3.2.
-mark