C曲線

turtle_c_curve.rb

require 'oekaki'
require_relative 'turtle'

Width, Height = 600, 400

Oekaki.app width: Width, height: Height, title: "C curve" do
  draw do
    clear
    
    t = Turtle.new(Width, Height, self)
    t.move(-130, -100)
    t.color(0, 65535, 0)
    ratio = sqrt(2) / 2
    
    drawing = lambda do |length, depth|
      if depth.zero?
        t.forward(length)
      else
        t.left(45)
        drawing[length * ratio, depth - 1]
        t.right(90)
        drawing[length * ratio, depth - 1]
        t.left(45)
      end
    end
    
    drawing[260.0, 10]
  end
end