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ex2.50.scm
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ex2.50.scm
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(define (transform-painter painter origin corner1 corner2)
(lambda (frame)
(let ((m (frame-coord-map frame)))
(let ((new-origin (m origin)))
(painter
(make-frame new-origin
(sub-vect (m corner1) new-origin)
(sub-vect (m corner2) new-origin)))))))
(define (flip-horiz painter)
(transform-painter painter
(make-vect 1.0 0.0) ; new origin
(make-vect 0.0 0.0) ; new end of edge1
(make-vect 1.0 1.0))) ; new end of edge2
(define (rotate-ctclock-180 painter)
transform-painter painter
(make-vect 1.0 1.0) ; new origin
(make-vect 0.0 1.0) ; new end of edge1
(make-vect 1.0 0.0))) ; new end of edge2
(define (rotate-ctclock-180 painter)
transform-painter painter
(make-vect 0.0 1.0) ; new origin
(make-vect 0.0 0.0) ; new end of edge1
(make-vect 1.0 1.0))) ; new end of edge2