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1997-04-16
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FRACTALS IN GFA BASIC
Written by Kevin Thomas
So, another fractal program. This one is my first program written in
GFA Basic. After previous attempts in Pascal, this one was much easier
(nothing against Pascal, I just have a Basic sort of brain). This program
has the features I wanted in a Fractal program - Manual parameter
setting, Zoom, Julia and Mandelbrot curves, Autosave, etc.
Basic Menu Functions:
Julia - Chooses a Julia curve fractal
Mandel - Chooses a Mandelbrot curve fractal
Zoom - Zooms in a specific area. This function allows a
variable zoom of any section of the drawing. It is
only available after a fractal has been drawn or
loaded. Center the crosshairs on the desired area.
Draw - Draws the fractal to the desired parameters
Parms - Manual entry of fractal parameters
Defaults - Resets parameters to defaults
Load - Loads a fractal drawing and associated parameters
Save - Save a fractal drawing and associated parameters
Help - A little bit of help
Delete - deletes a file
Rename - Renames a fractal drawing and associated
parameter file
Autosave - Saves fractal after drawing
A few words about the files produced. When a fractal drawing is
saved, two files are saved. The first is the actual screen, the second is
the parameters used to produce the screen. The files are named for the
type of fractal,i.e. Mandel or Julia, with an extender indicating the
resolution, or if it is a data file. For example, a file might be named
MANDEL01.FR0, the 0 on the end indicating low resolution. There would
also be an associated MANDEL01.DAT for the data file.
The basic information used for developing this program came from the
book 'The Beauty of Fractals', by H.-O. Peitgen and P. H. Richter. This
book is published by Springer-Verlag, ISBN 0-387- 15851-0, and well worth
getting just for the lovely pictures. Also of help was the classic 'The
Fractal Nature of Geometry' by Benoit B. Mandelbrot. This book is
published by W. H. Freeman and Company, ISBN 0-7167-1186-9. Both books
are highly recommended.
For more information, or any suggestions or programming
improvements, you can write me at:
Kevin Thomas
9509 Oriole Dr.
Austin, TX 78753