cow_sketcher.rb

ard = Arduino.new

setup do
  ard.setup do
  	name_analog 0, "lr"
  	name_analog 2, "ud"
  end
end

def joy_x; ard.lr - width/2 end
def joy_y; height - (ard.ud - height/2) end

pts = []

draw do
	image "http://images5.fanpop.com/image/photos/31400000/Cow-cows-31450223-350-350.jpg", 0, 0

	fill false
	circle joy_x, joy_y, 10
	line joy_x - 20, joy_y, joy_x + 20, joy_y
	line joy_x, joy_y - 20, joy_x, joy_y + 20

	pts.each_pair do |a, b|
		fill true
		circle a.first, a.last, 3
		circle b.first, b.last, 3
		line a.first, a.last, b.first, b.last
	end
end

key_down do |key|
	if key == 'a'
		pts << [joy_x, joy_y]
	else
		pts = []
	end
end