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Contents
########################################################
# Chequer implemented using a grammar library
# Lindenmayer System in ruby-processing by Martin Prout
########################################################
load_library :grammar
attr_reader :chequer
def setup
size 600, 600
@chequer = Chequer.new width * 0.9, height/10
chequer.create_grammar 4
no_loop
end
def draw
background 0
chequer.render
end
class Chequer
include Processing::Proxy
attr_accessor :axiom, :grammar, :production, :draw_length, :theta, :xpos, :ypos
DELTA = HALF_PI
def initialize(xpos, ypos)
@xpos = xpos
@ypos = ypos
@axiom = 'F-F-F-F' # Axiom
@grammar = Grammar.new(axiom, 'F' => 'FF-F-F-F-FF')
@draw_length = 500
stroke 0, 255, 0
stroke_weight 2
@theta = 0
end
def render
production.each do |element|
case element
when 'F'
x_temp = xpos
y_temp = ypos
@xpos -= draw_length * cos(theta)
@ypos -= draw_length * sin(theta)
line(x_temp, y_temp, xpos, ypos)
when '+'
@theta += DELTA
when '-'
@theta -= DELTA
else
puts "Character '#{element}' is not in grammar"
end
end
end
##############################
# create grammar from axiom and
# rules (adjust scale)
##############################
def create_grammar(gen)
@draw_length /= 3**gen
@production = @grammar.generate gen
end
end
Version data entries
6 entries across 6 versions & 1 rubygems