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1991-02-08
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ABOUT CREATE
CREATE is a program that generates 'self-affine' fractals; those
that are made up of copies of themselves.
The compiled program, CREATE.PRG, contains 38 fractals
pre-programmed into it - any of which you can draw at the touch
of a button.
Given the BASIC source code (a disk containing both HiSoft and
GFA 2 & 3 BASIC listings will be available for £5; see below for
more details) you can modify existing fractals or add your own -
up to a total of 100.
Included with the source code are fully documented examples of
how to create your own fractals. It's easy to modify an existing
fractal, altering the curl of the fern for example.
Once you've got the source code and played around with the
existing fractals, you'll want to go on to design your own:
leaves, grasses, trees, buildings, ruins, clouds, waves,
fireworks, ice crystals, snowflakes, explosions . . . or more
mathematical and abstract forms. Some of your prized creations
will arise from chance or error; a fractal might turn out nothing
like you'd intended, and be all the more fascinating because of
it; or a single misplaced block could turn a geometrical figure
into a ruined building.
What to do with your fractal images once you've concieved and
experimented with them? How about letterheads or logos; clip
art; backgrounds or major features to use in other pictures;
backgrounds for games; wrapping paper, wallpaper or curtain
designs(!).
Or just boot up with a virtual big screen to generate a vast and
intricate version of your fractal; then use the ST Club's
forthcoming "Imagecopy" accessory to print it out.
If you'd like to share-with-the-world any fractals you're
particularly proud of - then send me a disk with the source code
(of the relevant affine transformations) and after a few months
I'll release the collected contributions as a PD disk (all
contributors will automatically be sent a free copy). I might
also convert each fractal to a more compact file format that can
be individually loaded, edited and saved by a future fractal
program.
HOW TO USE CREATE
CREATE is controlled with a single, easy to use, dialogue box.
The up/down scroll buttons select a group of 10 fractals (of the
100 possible fractals) for you to choose from.
Just click on one of the ten named buttons to draw a particular
fractal: the dialogue and mouse cursor disappear and the fractal
starts to be drawn, dot by dot.
Click the left mouse button to interrupt drawing and return to
the dialogue box, then press "CONTINUE" to add the remaining
dots, rather than starting again.
When drawing is finished a "ping" sounds and the mouse cursor
reappears. A left click again returns you to the dialogue box.
"VIEW" lets you see your picture without performing any graphic
operation. The mouse cursor remains visible indicating that no
drawing is occurring.
The screen is only cleared on pressing "CLEAR" or selecting a new
background colour from the palette. This lets you draw one
fractal on top of another - in different colours should you wish
- adding green "leaves" to the "bare tree" for example.
You can "SAVE" your fractal images as Degas compatible PI? files,
or "LOAD" in pictures to draw fractals upon them - drawing
fractals onto a prepared background for example.
"UNDO" undoes the last graphical operation, and pressing "UNDO"
again undoes the undoing!
To draw large, highly detailed images boot-up with a virtual
large screen driver (BigScrn, MonSTEr or the flexible BIG_STE
available with Mouse Tricks). Use Jeremy Hughes' Imagecopy
(available soon from the ST Club) to save or print these large
images.
PROGRAMMING YOUR OWN FRACTALS
If you'd like to use CREATE to design your own fractals - or
modify those already included - send me £5 for a disk with the
fully documented BASIC source code.
This will include both HiSoft and GFA 2 & 3 compatible versions
plus a special integer calculation module that CREATE will summon
up to draw its fractals *fast*. I'll also include the latest
Mouse Tricks demonstration as used by CREATE's "INFO" function to
examine its own source code as it runs.
Or for £10 you'll recieve all of the above plus the full Mouse
Tricks 2.06 with BIG_STE. (£2.50 upgrade for existing reg. users
of Mouse Tricks 2)
Jonathan Lawrence
76 Sistova Road
London SW12 9QS
If you're interested in a future fractal program that would allow
you (amongst other things) to design fractals using the mouse
(rather than typing in numbers) and create landscapes comprising
many groups of fractals - then send me your name and address
(plus any suggestions) and I'll send you more information about
the program - if and when it gets written.