:::::::::::::
What is it?
:::::::::::::
Fract is a simple programm to create images of the following fractals
types:
Mandelbrot set
Julia set of z^2+c, c*sinz, c*cosz, c*expz
Spider
Phoenix
Glass
Noel1
Noel2
Newton Power
Tetrate
Barnsley1
Barnsley2
Barnsley3
The image created is saved in GIF format; a ".dat" text file contains
all the information of the computed image.
::::::::::::::::
How to use it?
::::::::::::::::
The syntax is :
fract {-m -j -s -c -e -sp -ph -g -n1 -n2 -nw -t -b1 -b2 -b3 }
-x width -y height [-r] [-i] [-deg]
[-x1] [-x2] [-y1] [-y2]
[-o] [-p]
Params in [] are optional
The first flag MUST be the one that specifies the fractal type:
-m : Mandelbrot set. Default settings:
Top Left Corner: (-2,2)
Bottom Right Corner: (2,-2)
Perturbation: 0
-j : Julia set of z^2 +c. Default settings:
Top Left Corner: (-2,2)
Bottom Right Corner: (2,-2)
Constant: -1
-s : Julia set of c*sinz. Default settings:
Top Left Corner: (-4,4)
Bottom Right Corner: (4,-4)
Constant: 1
-c : Julia set of c*cosz. Default settings:
Top Left Corner: (-4,4)
Bottom Right Corner: (4,-4)
Constant: 1
-e : Julia set of c*expz. Default settings:
Top Left Corner: (0,2)
Bottom Right Corner: (4,-2)
Constant: 1
-sp : Spider. Defeault settings:
Top Left Corner: (-2,2)
Bottom Right Corner: (2,-2)
Perturbation: 0
-ph : Phoenix. Default settings:
Top Left Corner: (-2,2)
Bottom Right Corner: (2,-2)
Perturbation: 0
-g : Glass. Default settings:
Top Left Corner: (-2,2)
Bottom Right Corner: (2,-2)
Perturbation: 0
-n1 : Noel1. Default settings:
Top Left Corner: (-2,2)
Bottom Right Corner: (2,-2)
Perturbation: 0
-n2 : Noel2. Default settings:
Top Left Corner: (-2,2)
Bottom Right Corner: (2,-2)
Perturbation: 0
-nw : Newton Power. Default settings:
Top Left Corner: (-2,2)
Bottom Right Corner: (2,-2)
Degree: 3
Constant: 0
-t : Tetrate. Default settings:
Top Left Corner: (-2,2)
Bottom Right Corner: (2,-2)
Perturbation: 0
-b1 : Barnsley1. Default settings:
Top Left Corner: (-2,2)
Bottom Right Corner: (2,-2)
Constant: 0.6+1.1i
-b2 : Barnsley2. Default settings:
Top Left Corner: (-2,2)
Bottom Right Corner: (2,-2)
Constant: 0.6+1.1i
-b3 : Barnsley3. Default settings:
Top Left Corner: (-2,2)
Bottom Right Corner: (2,-2)
Constant: 0.1+0.36i
Then you have to specify the image resolution using the '-x' and the
'-y' flags.
Optional parameters:
-x1 , -x2 , -y1 , -y2 : set corners for computation
[-r] : set perturbation or constant (it depends on the fractal type) real
part
[-i] : set perturbation or constant imaginary part
[-deg] : set degree for Newton Power. It must be greater than 2;
otherwise the default value (that is 3) is used.
[-o] : set output file name; ".gif" extension is not necessary.
The text file has the same name of the image, but the extension is
".dat". Default names are "out.gif" and "out.dat"
[-p] : set "Fractint style" palette file. Default is "vga.map"
:::::::::::
Compiling
:::::::::::
To compile the program type:
cc -O3 fract.c -o fract -lm
(Its +03 on hpux - but you knew that :)
:::::::::
Author
:::::::::
Massimo Casal
Viale Volontari della Liberta' 36/2
33100 Udine
Italy
E-mail addresses:
casal@udmi5400.cineca.it
mcasal@nyx.cs.du.edu
