example

Shape class

• members
  color, area, position, boundary
  
• methods
  draw, get_color, set_color
  

Circle class

• members
  radius
  
• methods
  set_radius, get_radius
  

Line class

• members
  length
  
  arrow_style
• methods
  move_tail
  
  
  

Shape

color : Colorarea : int

draw : Screen –>undefget_color : –> Colorset_color : Color –> undef

Circle

radius : int

get_radius : –> intset_radius : int –> undef

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