mkTurtle = require "turtle"
local screen = {
   width = love.graphics.getWidth(),
   height = love.graphics.getHeight(),
}
local o = mkTurtle(screen.width/2, screen.height*3/4)

local t = 0;
function love.update(dt)
   t = t+ dt
   
end



function love.draw()
   tt = o:dup()

   --   local fd, lt, rt, bk, pd = tt.fd, tt.lt, tt.rt, tt.bk, tt.pd
   -- tt.rt(45).fd(10)

   local amultl = 0.8 + math.cos(t*5)/2
   local amultr = 0.8 + math.cos(t*7)/2
   local lmultl = 0.7 + math.cos(t*3)/2
   local lmultr = 0.7 + math.cos(t*4.5)/2
   local iangle = math.cos(t*2.5)*40-20
   function trunk(tt, level, length, angle)
      tt.fd(length)
      if level > 0 then
	 tt.lt(iangle)
	 trunk(tt:dup().lt(angle), level-1, length*lmultl, angle*amultl)
	 trunk(tt:dup().rt(angle), level-1, length*lmultr, angle*amultr)
      end
   end

   trunk(tt, 10, 60, math.sin(t)*180)
	 

end