2.50.rkt

#lang sicp
;; Exercise 2.50: Define the transformation flip-horiz, which flips painters horizontally,
;; and transformations that rotate painters counterclockwise by 180 degrees and 270 degrees.

(#%require sicp-pict)

(define (flip-horiz painter)
  (transform-painter painter
                     (make-vect 1.0 0.0)
                     (make-vect 0.0 0.0)
                     (make-vect 1.0 1.0)))

(define (rotate180 painter)
  (transform-painter painter
                     (make-vect 1.0 1.0)
                     (make-vect 0.0 1.0)
                     (make-vect 1.0 0.0)))

(define (rotate270 painter)
  (transform-painter painter
                     (make-vect 0.0 1.0)
                     (make-vect 0.0 0.0)
                     (make-vect 1.0 1.0)))