A C++ program to generate Mandelbrot and Julia set fractals
fractal-gen is a simple program that will output a PNG image of the
fractal specified in the program's arguments. The user can set the size,
scale, colors, color depth, and translation of the generated image, along
with the fractal parameters themselves.
lodepng is used for PNG output.
The example fractal was generated with:
./fractal-gen 512 512 3.5 99D9FF FF6666 171717 mandelbrot 64
Clone the repository and run make to build.
Running the program will produce a PNG file called fractal.png of
the program output. Warning -- the program will happily overwrite any
existing fractal.png file. You might want to rename or move fractals
that you intend on keeping.
fractal-gen <width> <height> <scale> [color A] [color B] [color C]
[cr+ci] [color depth] [offx] [offy]
<width> -> the integral width of the output image
<height> -> the integral height of the output image
<scale> -> a floating-point scale for the output image. The scale can
be thought of as how zoomed the fractal is, a smaller scale
means a higher zoom.
[color A] -> the first color, provided in #RRGGBB format. The # may
be ommited. This color is used as the first point in a
linear interpolation, it will be used as values depart
the bounds of the fractal. Defaults to #000000
[color B] -> the second color, provided in #RRGGBB format. The # may
be ommited. This color is used as the second point in a
linear interpolation, it will be used as values approach
the bounds of the fractal. Defaults to #FFFFFF
[color C] -> the third color, provided in #RRGGBB format. The # may
be ommited. This color is used for points determined to
be within the fractal. For non-mandelbrot fractals, it
may be wise to set it to the same value as color B.
Defaults to #000000
[cr+ci] -> The complex argument used in fractal generation. This is
what can be used to change the generated fractal. Should
be given in the for of real_part + imaginary_part, or
mandelbrot for the mandelbrot set. Defaults to
mandelbrot.
[color depth] -> the color depth used in coloring. A higher value will
be more accurate, but may fade the image. A lower value
will make the fractal "pop", but causes distortion that
detracts from the image accuracy. Experiment to find
the ideal balance for each fractal.
[off x] -> an integral argument for an X translation to be done on
the generated image. defaults to 0.5.
[off y] -> an integral argument for a Y translation to be done on the
generatedf image. Defaults to 0.0.
- non-square images don't always work