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1991-02-02
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My apologies for not providing a bibliography, but I don't have any of
my literature available as I write this. Nevertheless, you shouldn't
have any trouble locating literature on fractals and Mandelbrot sets.
SMan(i.e. SManCP, SManLb, or SManLbCP) is a Mandelbrot generation
program written with the typical Amiga interface. By that, I mean that
it can be executed from CLI or Workbench, and that it is Menu Driven, with
command key combinations provided.
Upon execution of the program, a workbench window will be displayed with
a variety of information, Included will be CPU (and coprocessor if
present), screen resolution, and the coordinates in the complex plane.
In addition, available memory will be displayed. Also, values for
magnification and maximum count are displayed.
As you can see, the magnification on startup is 160. Since no point
within the Mandelbrot set is more than 2.... from the origin, a
magnification of 160 means that the Mandelbrot set will not extend
beyond the 320 horizontal pixels from the center of the screen.
The Maximum count refers to the number of attempts at determining
divergence of the sequence that are made before a given location is
assumed to be within the Mandelbrot set.
When you see this window and its information, SMan is already producing
its image on a custom screen in the background. To look at the image,
click on the close gadget at the upper-left corner of the 'Julian
Explorer Window'. The window won't actually close, but the custom
screen and its window will be brought forward, and you can see the
image being produced.
**********************************************************************
If you press down the right mouse button, the menus become visible.
Under the left-most menu (i.e. SMan) will be seen four menu items.
The first one 'About' will bring you back to the Workbench screen and
the Julian Explorer Window. You will probably want to use this to
get updated information about screen and magnification.
The second one 'Redraw(Same P) redraws the image with the same
parameters. The only reason you might want to use this would be if
you changed the maximum count after the drawing had already started
and wished to redraw for a consistent image.
'Save' will save you image to an iff file of ILBM form. Normally,
you would only want to select this item when the image is completed.
Sorry, no compression has been provided, and the file is always called
'Mand.iff'. Rename it if you want a different name. If I want the
file compressed and renamed, I just load it using DPaint(EA) or Digi-
View, and save it with a new name. They do my compression. Also, no
provision for adjustment of the palette has been made in SMan, since
that could be done using Deluxe Paint (Electronic Arts), or some other
paint program.
'Quit' is an obvious selection. This is actually the only way to
terminate the program.
**********************************************************************
The second Menu is 'View Mode'. HIRES is always on. You are permitted
to select either 'Lace On' or 'Lace Off'. The default is 'Lace Off'
since it will provide faster completion of an image. Your other
selections are 'Overscan' and 'Normal'. If you select overscan, your
resolution will be 704 by 239 or 704 by 478. With 'Normal', resolution
will by 640 by 200 or 640 by 400. Whenever, you select from the 'View
Mode' menu, the custom screen will be closed and reopened with the
new parameters, so the drawing is restarted.
**********************************************************************
The third Menu is 'Maximum Count'. The default is 31. As the count
is increased, the drawing time increases. As the magnification is
increased, you will have to increase the count to provide more detail.
However, if you want to speed up the drawing until you decide upon
what final parameters you want to have, use a smaller count.
**********************************************************************
The fourth Menu is 'Zoom'. This enables you to use the mouse to select
a new region to display. Select the menu item 'Select', and move the
mouse pointer to the upper-left corner of the region you wish to be
drawn. Press and hold down the left-mouse button, and drag it to
the lower-right corner of the region you want displayed and release the
button. Sorry, but only the horizontal coordinates determine the new
lower-right corner, but you can see what region you're going to get
before you release the button, since it will be outlined.
If you decide that you've selected the wrong region, you can get back
to you previous parameters by selecting 'Restore' from the 'Zoom' menu.
Sorry, but it only goes back one level, and redraws completely.
**********************************************************************
Have fun!
Dave McKinstry.