-- (C) 2004-2007, Oleg Kiselyov & Ralf Laemmel
-- Haskell's overlooked object system

module Polymorph where

import Shape
import Circle
import Rectangle


-- Weirich's / Rathman's test case

main = do
         -- Handle the shapes polymorphically
         let scribble = [ ShapeA (rectangle 10 20 5 6)
                        , ShapeA (circle 15 25 8) ]
         mapM_ (\x -> do draw x
                         draw (rMoveTo 100 100 x) )
               scribble

         -- Handle rectangle-specific instance
         let r = rectangle 0 0 15 15
         let r' = setWidth 30 r
         draw (ShapeA r')