# Main Command: Go 7
# Antenna Tree by Guy Walker
# www.logoarts.co.uk

to new
  # set default screen, pen and turtle 
  ResetAll SetScreenSize [400 400] HideTurtle 
  SetSC Black SetPC Green SetPS 1 PenUp 
end

to init :order
  Make "Size 96  # make Size and RootHalf global values
  Make "RootHalf 1/Sqrt 2
end

to display :order
  # write header title and curve level
  SetPC White SetPos [-190 184]
  Label Sentence [Antenna Tree Level] :Order
end

to tree :order :size
  If :Order < 1 [Stop]  # ie if = 0
  SetPW :Order Forward :Size Left 90 
  Tree :Order-1 :RootHalf*:Size
  SetPW :Order Left 90 Forward 2*:Size Left 90
  Tree :Order-1 :RootHalf*:Size
  SetPW :Order Left 90 Forward :Size
end

to go :order
  New Init :Order Display :Order
  Home Right 90 SetPC Green PenDown
  Tree :Order :Size
end