text: """
  Arctangent. 
  
  Move the mouse to change the direction of the eyes. 
  The atan2() function computes the angle from each eye 
  to the cursor. 
  """
  
  from eye import Eye
  
  e1 = Eye(250, 16, 120)
  e2 = Eye(164, 185, 80)
  e3 = Eye(420, 230, 220)
  
  
  def setup():
      size(640, 360)
      noStroke()
  
  
  def draw():
      background(102)
  
      e1.update(mouseX, mouseY)
      e2.update(mouseX, mouseY)
      e3.update(mouseX, mouseY)
      e1.display()
      e2.display()
      e3.display()
  