sidef-scripts/Image/dragon_curve.sf

#!/usr/bin/ruby

# https://rosettacode.org/wiki/Dragon_curve

include('LSystem/LSystem.sf')

var rules = Hash(
    x => 'x+yF+',
    y => '-Fx-y',
)

var lsys = LSystem(
    width:  600,
    height: 600,

    xoff: -430,
    yoff: -380,

    len:   8,
    angle: 90,
    color: 'dark green',
)

lsys.execute('Fx', 11, "dragon_curve.png", rules)