boing



XScreenSaver(1)                                                XScreenSaver(1)




NAME

       boing - draws a bouncing ball like the ancient Amiga demo


SYNOPSIS

       boing   [-display  host:display.screen]  [-window]  [-root]  [-install]
       [-visual visual]  [-delay  usecs]  [-smooth]  [-lighting]  [-scanlines]
       [-speed]  [-no-spin]  [-angle  degrees]  [-size  ratio]  [-parallels n]
       [-meridians n] [-wireframe] [-fps]


DESCRIPTION

       The boing program draws a bouncing checkered ball on a grid.

       This is a clone of the first graphics demo for the  Amiga  1000,  which
       was  written  by Dale Luck and RJ Mical during a break at the 1984 Con-
       sumer Electronics Show (or so the legend goes.)   The  boing  ball  was
       briefly the official logo of Amiga Inc., until they were bought by Com-
       modore later that year.

       With no arguments, this program looks a lot  like  the  original  Amiga
       demo. With "-smooth -lighting", it looks... less old.


OPTIONS

       boing accepts the following options:

       -window Draw on a newly-created window.  This is the default.

       -root   Draw on the root window.

       -install
               Install a private colormap for the window.

       -visual visual
               Specify  which  visual  to use.  Legal values are the name of a
               visual class, or the id number (decimal or hex) of  a  specific
               visual.

       -delay usecs
               The  delay  between  frames  of the animation, in microseconds:
               default 15000.

       -smooth Draw a smooth sphere instead of a faceted polyhedron.

       -lighting
               Do shaded lighting instead of flat colors.

       -scanlines
               If the window is large enough, draw horizontal lines  to  simu-
               late the scanlines on a low resolution monitor.

       -speed ratio
               Change  the  animation speed; 0.5 to go half as fast, 2.0 to go
               twice as fast.

       -no-spin
               Don’t rotate the ball.

       -angle degrees
               The jaunty angle at which the ball sits.  Default 15 degrees.

       -size ratio
               How big the ball is; default 0.5 meaning about half the size of
               the window.

       -parallels n
               -meridians  n  The  pattern of rectangles on the ball.  Default
               8x16.

       -wireframe
               Look crummy.

       -fps    Display a running tally of how many frames per second are being
               rendered.   In  conjunction with -delay 0, this can be a useful
               benchmark of your GL performance.


ENVIRONMENT

       DISPLAY to get the default host and display number.

       XENVIRONMENT
               to get the name of a resource file that  overrides  the  global
               resources stored in the RESOURCE_MANAGER property.


SEE ALSO

       bsod(1), pong(1), xscreensaver(1), X(1)


COPYRIGHT

       Copyright  ©  2005 by Jamie Zawinski.  Permission to use, copy, modify,
       distribute, and sell this software and its documentation for  any  pur-
       pose  is  hereby granted without fee, provided that the above copyright
       notice appear in all copies and that both  that  copyright  notice  and
       this  permission  notice appear in supporting documentation.  No repre-
       sentations are made about the suitability of this software for any pur-
       pose.  It is provided "as is" without express or implied warranty.


AUTHOR

       Jamie Zawinski <jwz@jwz.org>, 19-Feb-2005.



X Version 11                       30-Oct-99                   XScreenSaver(1)

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