#!/usr/bin/ruby
include('LSystem/LSystem.sf')
var rules = Hash(
    a => '-bF+aFa+Fb-',
    b => '+aF-bFb-Fa+',
)
var lsys = LSystem(
    width:  600,
    height: 600,
    scale: 1,
    xoff: -50,
    yoff: -50,
    len:   8,
    angle: 90,
    color: 'dark green',
)
lsys.execute('a', 6, "hilbert_curve.png", rules)