Introduction

Hop is a BackSpace module which creates hopalong iterated fractals 
according to an algorithm described in the September 1986 issue of
Scientific American.  Personally, this has always been my favorite 
screen saver since I first saw an implementation of it in the 
"xlock" screen saver available in the X-Windows environment.  In
my opinion, no serious computing platform should be without one.

When using Hop the following parameters are available to the user 
on the Hop control panel:

Complexity - This controls the number of pixels which will be 
plotted for the current fractal before starting a new one.  Move the 
slider to the right to increase the value and to plot more pixels 
for each fractal and to see more details.  If you're impatient, move 
it to the left which will plot less pixels and you can see more 
patterns quickly.

Saturation and Brightness - Hop uses the HSB (Hue, Saturation, and 
Brightness) color model when plotting pixels on the screen.  The hue 
of each pixel is set according to the iteration within which the 
pixel is drawn while the saturation and brightness may be controlled 
by the user to change the resulting colors.


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Installation

1.  The distribution file is compressed with the 'gzip' command so it
    is first necessary to unzip it with the following command:

    gunzip Hop.BackSpace.1.0.PI.b.tar.gz

2.  Then, the 'tar' command is used to extract the module:

    tar -xvf Hop.BackSpace.1.0.PI.b.tar

3.  BackSpace modules can be installed in one of two directories.  Either
    /Local/Library/BackSpace to make the module available to all users
    of the system, or ~Library/BackSpace (where ~ indicates your home
    directory) to make it available only to yourself.  Simply copy the
    file "Hop.BackSpace" to the desired installation directory using 
    the File Viewer.  Note, you may need to be logged in as "root" to
    copy the file to /Local/Library/BackSpace.

4.  Quit and then re-start BackSpace and you should see "Hop" listed as
    an available screen saver module.


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Acknowledgements

Many thanks to Mike Trent and his excellent tutorial about writing BackSpace
modules.  This tutorial and his collection of BackSpace modules can be found
at:

http://www.fullfeed.com/~mtrent/backspace.html

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Contact Information

L dot C Software
P.O. Box 1727
Milwaukee, WI  53201-1727

Phone:  414-319-5980
Fax:    414-961-2359

Web:    http://www.longrie.com
E-Mail: terry@george.longrie.com


