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ffex
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1992-05-06
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=============================================================================
This program is public domain
It may be used, copied and spread without any restriction,
as long as there is no payment demanded (except for disks
and postage etc.)! The .dok and .doc files must also be
copied along with the program.
FFEX - The Fast Fractal Exploration Set
Documentation:
FFEX computes the well known Fractals and has all usual features like
loading and saving (as IFF picture), different resolutions and different
algorithms (Int_16 and Int_32 are faster, but have less precision than
Real).
The highlights of FFEX are that is written in modula-II (a highlight?!) and
assembler, and the strange method that is used to create the pictures.
Because of the pulldown menues and requesters the use of the program is
very simple, so I describe only a few
peculiarities
:
To define the detail to be zoomed, move the cursor (lens) to the middle of
the region, and press the left mousebutton. Move the mouse whith pressed
button, to define the region. The region is allways undistorted. When you
release the button, the frame remains on the screen. To compute the new
picture select "Render" from the "Action" menu. This has the benefit, that
you can select another region if you whave selected a wrong one by chance
or something like that.
Important
: If you change values in the "Setup/Limits" requester, the zoom
frame will disappear, because the picture and with it the sector doesn't
correnspond to the values any longer.
FFEX saves the limits of every picture within the IFF-file. So if it loads
the picture later, it knows the limits of the picture. This only works, if
you don't load and save the picture within an other program, because this
would destroy the limits saved in the picture, and FFEX won't load the
picture anymore.
Method of creating a picture:
In a fractal a region of one color is never surrounded by an other color
completely. FFEX uses this fact. It computes the border of a rectangle,
and if the whole border has only one color, it can fill the rectangle with
the same color, without computing the pixels in the rectangle. If the
border is multicolored, it splits the rectangle into four smaller ones, and
checks each of them, and so on, and so on ...
This saves a lot of time, because FFEX needs not to compute the color of
each pixel.
Have fun! -Rob-
=============================================================================
Robert Brandner / Schillerstr. 3 / A-8280 Fürstenfeld / AUSTRIA / EUROPE
=============================================================================