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-
- F E R N V A L L E Y
-
- by Ian Adam
-
- If you're like me, you probably jumped directly to this program,
- thinking that it may be an adventure game of some sort, concerning the
- seemingly normal, yet somehow twisted, inhabitants of a seemingly normal,
- yet somehow malevolent village on the Canadian border. You know, just down
- the road from Twin Peaks. Well, I'm afraid that program is yet to be found.
-
- FERN VALLEY is actually a very interesting, "cutting edge" program that
- allows you to learn about and create the latest fractal craze, the Affine
- Transformations. This is a sophisticated, iterative algorithm that draws
- fern-like images on your screen using only mathematical formulas.
- "Iterative" means that it performs certain operations ON ITSELF over and
- over again. "Algorithm" is a ten-dollar word for procedure, or formula.
-
- One of the things that makes fractals and other transformations so
- important to scientists is that the "formula" for making a huge picture can
- be stated in a few numbers. The picture itself may contain millions of bits
- of information, but the formula for it may use only a hundred or so bits.
- Since we have computers that will perform the dirty work once we plug in the
- formula, we can save a lot of time and space by just saving the formula, not
- the whole completed picture.
-
- The "guts" of FERN VALLEY takes up only a few lines of code, but Ian
- Adam has made the program into a showcase of C-128 capabilities and
- friendliness. The program supports REUs, for instance. It's all
- menu-driven and very intuitive, once you explored the various nooks and
- crannies of the program.
-
- Read the INFORMATION first to learn about fractals and Affine
- Transformations, then experiment to your heart's desire. You can always get
- back to the Main Menu and read the information again should you have a
- question.
-
- There are plenty of options, but don't worry...none of them will do
- anything worse than wipe out the current fern that's being drawn. Since the
- data (called 'parameters') remains intact, you can just start the fern
- growing again.
-
- You can save your pictures as 32-block bitmap files with FERN VALLEY's
- save command. In order to display the picture all you need to do is:
-
- GRAPHIC1,1:GRAPHIC0 allocate space
- BLOAD"FRN.XXXX",P8192 load the pic
- GRAPHIC1 display it
-
- This program is all in BASIC 7.0 and is easy to read and understand. If
- you are a 128 programmer, I definitely recommend checking out Ian's code and
- style. It's modern, friendly and attractive, and moreover, it's easy to
- edit.
-
- I think I'll put FERN VALLEY down on my list of places to visit this
- fall. Right after I solve Laura Palmer's murder and take Jocey Packard away
- from Sheriff Harry S. Truman. He doesn't deserve a woman of such quality
- and wealth (even if she may be a murderer, or worse!).
-
- FT
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