Fractal-Turtle

A python turtle program that can render fractals using L-Systems. Customization is handled with .json files and there are a few presets included.

Command Line Arguments

Required

-s | --settings Ex. ./presets/plants/seaweed.json

Path to your fractal configuration JSON file.

With Defaults

-l | --length Default: 20

Length of each line drawn

-i | --iterations Default: 5

The number of fractal iterations

-eH | --export-scale-horizontal Default: 10000

Specify the horizontal scale of the .svg file (Yes this is a thing)

-eV | --export-scale-vertical Default: 10000

Specify the vertical scale

Optional

-e | --export Ex. True

Export the fractal as an .svg file

-v | --verbose Ex. True

Enable debugging

L-System Configuration Files

Using configuration files one can create custom fractals in the format of L-Systems and render them with Fractal Turtle.

JSON Format

{
    "line":["F"],
    "axiom":"F--F--F",
    "angle":60,
    "rules":[
        {"value":"F", "equation":"F+F--F+F"}
    ]
}

Example from snowflake.json

The line array defines which variables will make the turtle draw a line.

The axiom string defines the starting value of the fractal.

The angle integer defines the angle left or right at each turn.

The rules array holds the rules that the fractal will follow.

Each map inside of the rules array has a key named value and a key named equation. Value holds the value that will be replaced by the equation every iteration.

External Dependencies

svgwrite - https://pypi.org/project/svgwrite/