Logo Arts

To New
  # set default screen, pen and turtle values
  ResetAll SetScreenSize [400 400] HideTurtle
  SetSC Black SetPC Green SetPS 1 PenUp
End

To Rings
  For [Radius 20 60 20] [
      SetPC White rArc 270 :Radius
      SetPC Red rArc 90 :Radius]
End

To rArc :Angle :Radius
  # clockwise arc drawn relative to turtle heading
  Arc :Radius Heading :Angle+Heading Right :Angle
End

To Go
  New SetPW 2
  Repeat 4 [
    Home Right 45 + RepCount *90
    Forward 120 Left 135 Rings]
End