#lang racket/base
#|
;; snippet of code for experimentation
#lang racket/gui
(require 2htdp/image
         lang/posn
         (only-in lang/htdp-advanced equal~?))

(define images
  (list (rhombus 10 90 'solid 'black)
        (rotate 45 (square 10 'solid 'black))))

(define t (new text%))
(define f (new frame% [label ""] [width 600] [height 400]))
(define ec (new editor-canvas% [parent f] [editor t]))
(for ((i (in-list images))) (send t insert i) (send t insert " "))
(send f show #t)
|#

(require 2htdp/image
         (only-in mrlib/image-core 
                  image%
                  make-image
                  image-shape
                  image-bb
                  image-normalized?
                  skip-image-equality-fast-path
                  make-overlay
                  make-translate
                  make-bb
                  normalize-shape
                  make-ellipse
                  make-polygon
                  make-point
                  make-crop
                  crop?
                  normalized-shape?
                  image-snip->image
                  to-img
                  render-normalized
                  render-image)
         (only-in "../private/image-more.rkt"
                  bring-between
                  swizzle)
         mrlib/private/image-core-bitmap
         lang/posn
         racket/math
         racket/runtime-path
         racket/class
         racket/file
         racket/gui/base
         racket/port
         wxme
         rackunit
         file/convertible
         (only-in lang/imageeq image=?)
         (prefix-in 1: htdp/image)
         (only-in lang/htdp-advanced equal~?))

(require (for-syntax racket/base))
(define-syntax (test stx)
  (syntax-case stx ()
    [(test a => b)
     (with-syntax ([check-equal? (datum->syntax #'here 'check-equal? stx)])
       #`(begin
           ;(printf "running line ~a\n" #,(syntax-line stx))
           #,(quasisyntax/loc stx (check-equal? a b))
           (parameterize ([skip-image-equality-fast-path #t])
             #,(quasisyntax/loc stx (check-equal? a b)))))]))

(define-syntax (test/exn stx)
  (syntax-case stx ()
    [(test/exn a => b)
     (with-syntax ([check-equal? (datum->syntax #'here 'check-equal? stx)])
       #`(let ([reg b])
           (unless (regexp? reg)
             (error 'test/exn "expected a regular expression, got ~e" reg))
           ;(printf "running line ~a\n" #,(syntax-line stx))
           #,(quasisyntax/loc stx (check-regexp-match 
                                   reg
                                   (with-handlers ((exn:fail? exn-message)) a "NO EXN!")))))]))

;; test case: (beside (text "a"...) (text "b" ...)) vs (text "ab")

;(show-image (frame (rotate 30 (ellipse 200 400 'solid 'purple))))

(define-simple-check (check-close a b)
  (and (number? a)
       (number? b)
       (< (abs (- a b)) 0.001)))

(define-syntax-rule 
  (round-numbers e)
  (call-with-values (λ () e) round-numbers/values))

(define (round-numbers/values . args) (apply values (round-numbers/proc args)))

(define (round-numbers/proc x)
  (let loop ([x x])
    (cond
      [(number? x) (let ([n (exact->inexact (/ (round (* 100. x)) 100))])
                     (if (equal? n -0.0)
                         0.0
                         n))]
      [(pair? x) (cons (loop (car x)) (loop (cdr x)))]
      [(vector? x) (apply vector (map loop (vector->list x)))]
      [(is-a? x image%)
       (make-image 
        (loop (image-shape x))
        (loop (image-bb x))
        (loop (image-normalized? x)))]
      [(object? x)
       ;; add a random number here to hack around the way Eli's tester treats two errors as a passing test
       (error 'round-numbers/proc "cannot handle objects ~a" (random))]
      [(let-values ([(a b) (struct-info x)]) a)
       =>
       (λ (struct-type)
         (apply
          (struct-type-make-constructor struct-type)
          (map loop (cdr (vector->list (struct->vector x))))))]
      [else x])))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; circle vs ellipse
;;

(test (ellipse 40 40 'outline 'black)
      =>
      (circle 20 'outline 'black))
(test (ellipse 60 60 'solid 'red)
      =>
      (circle 30 'solid 'red))


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; width and height
;;

(test (image-width (rectangle 10 20 'solid 'blue))
      =>
      10)
(test (image-height (rectangle 10 20 'solid 'blue))
      =>
      20)
(test (image-width (rectangle 0 100 'solid 'blue))
      =>
      0)
(test (image-height (rectangle 0 100 'solid 'blue))
      =>
      100)
(test (image-width (rectangle 100 0 'solid 'blue))
      =>
      100)
(test (image-height (rectangle 100 0 'solid 'blue))
      =>
      0)

(test (image-width empty-image) => 0)
(test (image-height empty-image) => 0)
(test (equal? (above empty-image
                     (rectangle 10 10 "solid" "red"))
              (beside empty-image
                      (rectangle 10 10 "solid" "red")))
      =>
      #t)

(check-close (image-width (rotate 45 (rectangle 100 0 'solid 'blue)))
             (inexact->exact (ceiling (* (sin (* pi 1/4)) 100))))
(check-close (image-height (rotate 45 (rectangle 100 0 'solid 'blue)))
             (inexact->exact (ceiling (* (sin (* pi 1/4)) 100))))
(check-close (image-width (rotate 45 (rectangle 0 100 'solid 'blue)))
             (inexact->exact (ceiling (* (sin (* pi 1/4)) 100))))
(check-close (image-height (rotate 45 (rectangle 0 100 'solid 'blue)))
             (inexact->exact (ceiling (* (sin (* pi 1/4)) 100))))

(test (image-width (scale 4 (rectangle 10 10 'outline 'black)))
      =>
      40)
(test (image-width (rotate 90 (scale 4 (rectangle 10 10 'outline 'black))))
      =>
      40)

(test (image-width (scale 4 (rectangle 10 10 'solid 'black)))
      =>
      40)
(test (image-width (rotate 90 (scale 4 (rectangle 10 10 'solid 'black))))
      =>
      40)


(test (image-width (ellipse 10 20 'solid 'blue))
      =>
      10)
(test (image-height (ellipse 10 20 'solid 'blue))
      =>
      20)
(test (image-width (ellipse 0 100 'solid 'blue))
      =>
      0)
(test (image-height (ellipse 0 100 'solid 'blue))
      =>
      100)
(test (image-width (ellipse 100 0 'solid 'blue))
      =>
      100)
(test (image-height (ellipse 100 0 'solid 'blue))
      =>
      0)

(test (image-width (rotate 30 (ellipse 100 0 'solid 'blue)))
      =>
      (inexact->exact (ceiling (* (cos (* pi 1/6)) 100))))
(test (image-height (rotate 30 (ellipse 100 0 'solid 'blue)))
      =>
      (inexact->exact (ceiling (* (sin (* pi 1/6)) 100))))
(check-close (image-width (rotate 30 (ellipse 0 100 'solid 'blue)))
             (* (sin (* pi 1/6)) 100))
(check-close (image-height (rotate 30 (ellipse 0 100 'solid 'blue)))
             (ceiling (* (cos (* pi 1/6)) 100)))

;; zero-sized htdp/image images should also work
(test (image-width (1:text "" 18 "blue"))
      =>
      0)
(test (image-height (1:rectangle 10 0 'solid "red"))
      =>
      0)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;  polygon equality
;;

(test (polygon (list (make-posn 0 0)
                     (make-posn 10 10)
                     (make-posn 10 0))
               "solid" "plum")
      =>
      (polygon (list (make-posn 10 10)
                     (make-posn 10 0)
                     (make-posn 0 0))
               "solid" "plum"))

(test (polygon (list (make-posn 0 0)
                     (make-posn 0 10)
                     (make-posn 10 10)
                     (make-posn 10 0))
               "solid" "plum")
      =>
      (rectangle 10 10 "solid" "plum"))

(test (polygon (list (make-posn 0 0)
                     (make-posn 0 10)
                     (make-posn 10 10)
                     (make-posn 10 0))
               "solid" "plum")
      =>
      (polygon (list (make-posn 0 0)
                     (make-posn 0 10)
                     (make-posn 10 10)
                     (make-posn 10 0)
                     (make-posn 0 0))
               "solid" "plum"))

(test (polygon (list (make-posn 0 0)
                     (make-posn 0 10)
                     (make-posn 10 10)
                     (make-posn 10 0))
               "outline"
               (make-pen "plum" 8 "solid" "round" "round"))
      =>
      (polygon (list (make-posn 0 0)
                     (make-posn 0 10)
                     (make-posn 10 10)
                     (make-posn 10 0)
                     (make-posn 0 0))
               "outline"
               (make-pen "plum" 8 "solid" "round" "round")))

;; make sure equality isn't equating everything
(test (equal? (rectangle 10 10 'solid 'blue)
              (rectangle 10 10 'solid 'red))
      =>
      #f)

;; make sure 'white and black match up with color structs
(test (rectangle 10 10 'solid (make-color 255 255 255))
      =>
      (rectangle 10 10 'solid 'white))
(test (rectangle 10 10 'solid (make-color 0 0 0))
      =>
      (rectangle 10 10 'solid 'black))

;; test zero sized image equalities

(test (rectangle 0 100 'solid 'white)
      =>
      (rectangle 0 100 'solid 'white))

(test (rectangle 0 100 'solid 'white)
      =>
      (rectangle 0 100 'solid 'black))

(test (rectangle 100 0 'solid 'white)
      =>
      (rectangle 100 0 'solid 'black))

(test (rectangle 0 0 'solid 'black)
      =>
      (rectangle 0 0 'solid 'orange))

(test (equal~? (rectangle 0 100 'solid 'white)
               (rotate 90 (rectangle 100 0 'solid 'black))
               .1)
      =>
      #t)

;; test to make sure that image=? is provided from 2htdp/image and
;; not just built into the teaching languages.
(test (image=? (rectangle 10 10 'solid 'red) (rectangle 10 10 'solid 'red))
      =>
      #t)

(test (image=? (overlay (rectangle 3 1 'solid 'blue)
                        (rectangle 1 3 'solid 'blue))
               (overlay (rectangle 1 3 'solid 'blue)
                        (rectangle 3 1 'solid 'blue)))
      =>
      #t)


(test (with-handlers ((exn:fail? (λ (x) 'passed)))
        (begin (image=? 1 2) 'fail))
      =>
      'passed)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;  testing overlays
;;

(test (overlay (ellipse 100 100 'solid 'blue)
               (ellipse 120 120 'solid 'red))
      =>
      (make-image
       (make-overlay
        (make-translate 10 10 (image-shape (ellipse 100 100 'solid 'blue)))
        (make-translate 0 0 (image-shape (ellipse 120 120 'solid 'red))))
       (make-bb 120
                120
                120)
       #f))

(test (overlay/xy (ellipse 100 100 'solid 'blue)
                  -10 -10
                  (ellipse 120 120 'solid 'red))
      =>
      (overlay (ellipse 100 100 'solid 'blue)
               (ellipse 120 120 'solid 'red)))


(test (overlay/xy (ellipse 50 100 'solid 'red)
                  -25 25
                  (ellipse 100 50 'solid 'green))
      =>
      (make-image
       (make-overlay
        (make-translate
         25 0
         (image-shape (ellipse 50 100 'solid 'red)))
        (make-translate
         0 25
         (image-shape (ellipse 100 50 'solid 'green))))
       (make-bb 100
                100
                100)
       #f))

(test (overlay/xy (ellipse 100 50 'solid 'green)
                  10 10
                  (ellipse 50 100 'solid 'red))
      =>
      (make-image
       (make-overlay
        (make-translate 0 0 (image-shape (ellipse 100 50 'solid 'green)))
        (make-translate 10 10 (image-shape (ellipse 50 100 'solid 'red))))
       (make-bb 100
                110
                110)
       #f))

(test (overlay (ellipse 100 50 'solid 'green)
               (ellipse 50 100 'solid 'red))
      =>
      (make-image
       (make-overlay
        (make-translate 0 25 (image-shape (ellipse 100 50 'solid 'green)))
        (make-translate 25 0 (image-shape (ellipse 50 100 'solid 'red))))
       (make-bb 100
                100
                100)
       #f))

(test (overlay (ellipse 100 100 'solid 'blue)
               (ellipse 120 120 'solid 'red)
               (ellipse 140 140 'solid 'green))
      =>
      (make-image
       (make-overlay
        (make-translate 
         10 10
         (make-overlay
          (make-translate 10 10 (image-shape (ellipse 100 100 'solid 'blue)))
          (make-translate 0 0 (image-shape (ellipse 120 120 'solid 'red)))))
        (make-translate 0 0 (image-shape (ellipse 140 140 'solid 'green))))
       (make-bb 140 140 140)
       #f))

(test (overlay/align 'middle
                     'middle
                     (ellipse 100 50 'solid 'green)
                     (ellipse 50 100 'solid 'red))
      =>
      (make-image
       (make-overlay
        (make-translate 0 25 (image-shape (ellipse 100 50 'solid 'green)))
        (make-translate 25 0 (image-shape (ellipse 50 100 'solid 'red))))
       (make-bb 100 100 100)
       #f))

(test (overlay/align 'middle
                     'middle
                     (ellipse 50 100 'solid 'red)
                     (ellipse 100 50 'solid 'green))
      =>
      (make-image
       (make-overlay
        (make-translate 25 0 (image-shape (ellipse 50 100 'solid 'red)))
        (make-translate 0 25 (image-shape (ellipse 100 50 'solid 'green))))
       (make-bb 100 100 100)
       #f))


(test (overlay/align 'right
                     'bottom
                     (ellipse 50 100 'solid 'red)
                     (ellipse 100 50 'solid 'green))
      =>
      (make-image
       (make-overlay
        (make-translate 50 0 (image-shape (ellipse 50 100 'solid 'red)))
        (make-translate 0 50 (image-shape (ellipse 100 50 'solid 'green))))
       (make-bb 100 100 100)
       #f))

(test (overlay/align 'right
                     'baseline
                     (ellipse 50 100 'solid 'red)
                     (ellipse 100 50 'solid 'green))
      =>
      (make-image
       (make-overlay
        (make-translate 50 0 (image-shape (ellipse 50 100 'solid 'red)))
        (make-translate 0 50 (image-shape (ellipse 100 50 'solid 'green))))
       (make-bb 100 100 100)
       #f))

(test (beside/align 'top
                    (ellipse 50 100 'solid 'red)
                    (ellipse 100 50 'solid 'blue))
      
      =>
      (make-image
       (make-overlay
        (make-translate 0 0 (image-shape (ellipse 50 100 'solid 'red)))
        (make-translate 50 0 (image-shape (ellipse 100 50 'solid 'blue))))
       (make-bb 150 100 100)
       #f))

(test (beside/align 'center
                    (ellipse 50 100 'solid 'red)
                    (ellipse 100 50 'solid 'blue))
      
      =>
      (make-image
       (make-overlay
        (make-translate 0 0 (image-shape (ellipse 50 100 'solid 'red)))
        (make-translate 50 25 (image-shape (ellipse 100 50 'solid 'blue))))
       (make-bb 150 100 100)
       #f))

(test (beside/align 'baseline
                    (ellipse 50 100 'solid 'red)
                    (ellipse 100 50 'solid 'blue))
      
      =>
      (make-image
       (make-overlay
        (make-translate 0 0 (image-shape (ellipse 50 100 'solid 'red)))
        (make-translate 50 50 (image-shape (ellipse 100 50 'solid 'blue))))
       (make-bb 150 100 100)
       #f))

(test (beside (ellipse 50 100 'solid 'red)
              (ellipse 100 50 'solid 'blue))
      =>
      (beside/align 'center
                    (ellipse 50 100 'solid 'red)
                    (ellipse 100 50 'solid 'blue)))

(test (above/align 'left
                   (ellipse 50 100 'solid 'red)
                   (ellipse 100 50 'solid 'blue))
      
      =>
      (make-image
       (make-overlay
        (make-translate 0 0 (image-shape (ellipse 50 100 'solid 'red)))
        (make-translate 0 100 (image-shape (ellipse 100 50 'solid 'blue))))
       (make-bb 100 150 150)
       #f))

(test (above/align 'center
                   (ellipse 50 100 'solid 'red)
                   (ellipse 100 50 'solid 'blue))
      
      =>
      (make-image
       (make-overlay
        (make-translate 25 0 (image-shape (ellipse 50 100 'solid 'red)))
        (make-translate 0 100 (image-shape (ellipse 100 50 'solid 'blue))))
       (make-bb 100 150 150)
       #f))

(test (above/align 'right
                   (ellipse 50 100 'solid 'red)
                   (ellipse 100 50 'solid 'blue))
      
      =>
      (make-image
       (make-overlay
        (make-translate 50 0 (image-shape (ellipse 50 100 'solid 'red)))
        (make-translate 0 100 (image-shape (ellipse 100 50 'solid 'blue))))
       (make-bb 100 150 150)
       #f))

(test (above (ellipse 50 100 'solid 'red)
             (ellipse 100 50 'solid 'blue))
      =>
      (above/align 'center
                   (ellipse 50 100 'solid 'red)
                   (ellipse 100 50 'solid 'blue)))



(test (underlay (ellipse 100 100 'solid 'blue)
                (ellipse 120 120 'solid 'red))
      =>
      (make-image
       (make-overlay
        (make-translate 0 0 (image-shape (ellipse 120 120 'solid 'red)))
        (make-translate 10 10 (image-shape (ellipse 100 100 'solid 'blue))))
       (make-bb 120
                120
                120)
       #f))

(test (underlay/xy (ellipse 100 100 'solid 'blue)
                   -10 -10
                   (ellipse 120 120 'solid 'red))
      =>
      (underlay (ellipse 100 100 'solid 'blue)
                (ellipse 120 120 'solid 'red)))


(test (underlay/xy (ellipse 50 100 'solid 'red)
                   -25 25
                   (ellipse 100 50 'solid 'green))
      =>
      (make-image
       (make-overlay
        (make-translate 0 25 (image-shape (ellipse 100 50 'solid 'green)))
        (make-translate 25 0 (image-shape (ellipse 50 100 'solid 'red))))
       (make-bb 100
                100
                100)
       #f))

(test (underlay/xy (ellipse 100 50 'solid 'green)
                   10 10
                   (ellipse 50 100 'solid 'red))
      =>
      (make-image
       (make-overlay
        (make-translate 10 10 (image-shape (ellipse 50 100 'solid 'red)))
        (make-translate 0 0 (image-shape (ellipse 100 50 'solid 'green))))
       (make-bb 100
                110
                110)
       #f))

(test (underlay (ellipse 100 50 'solid 'green)
                (ellipse 50 100 'solid 'red))
      =>
      (make-image
       (make-overlay
        (make-translate 25 0 (image-shape (ellipse 50 100 'solid 'red)))
        (make-translate 0 25 (image-shape (ellipse 100 50 'solid 'green))))
       (make-bb 100
                100
                100)
       #f))

(test (underlay (ellipse 100 100 'solid 'blue)
                (ellipse 120 120 'solid 'red)
                (ellipse 140 140 'solid 'green))
      =>
      (make-image
       (make-overlay
        (make-translate 
         0 0
         (make-overlay
          (make-translate 0 0 (image-shape (ellipse 140 140 'solid 'green)))
          (make-translate 10 10 (image-shape (ellipse 120 120 'solid 'red)))))
        (make-translate 10 10 (image-shape (ellipse 100 100 'solid 'blue))))
       (make-bb 140 140 140)
       #f))

(test (underlay/align 'middle
                      'middle
                      (ellipse 100 50 'solid 'green)
                      (ellipse 50 100 'solid 'red))
      =>
      (make-image
       (make-overlay
        (make-translate 25 0 (image-shape (ellipse 50 100 'solid 'red)))
        (make-translate 0 25 (image-shape (ellipse 100 50 'solid 'green))))
       (make-bb 100 100 100)
       #f))

(test (underlay/align 'middle
                      'middle
                      (ellipse 50 100 'solid 'red)
                      (ellipse 100 50 'solid 'green))
      =>
      (make-image
       (make-overlay
        (make-translate 0 25 (image-shape (ellipse 100 50 'solid 'green)))
        (make-translate 25 0 (image-shape (ellipse 50 100 'solid 'red))))
       (make-bb 100 100 100)
       #f))

(test (underlay/align 'right
                      'bottom
                      (ellipse 50 100 'solid 'red)
                      (ellipse 100 50 'solid 'green))
      =>
      (make-image
       (make-overlay
        (make-translate 0 50 (image-shape (ellipse 100 50 'solid 'green)))
        (make-translate 50 0 (image-shape (ellipse 50 100 'solid 'red))))
       (make-bb 100 100 100)
       #f))

(test (underlay/align "right"
                      "baseline"
                      (ellipse 50 100 'solid 'red)
                      (ellipse 100 50 'solid 'green))
      =>
      (make-image
       (make-overlay
        (make-translate 0 50 (image-shape (ellipse 100 50 'solid 'green)))
        (make-translate 50 0 (image-shape (ellipse 50 100 'solid 'red))))
       (make-bb 100 100 100)
       #f))

(test (overlay/offset (rectangle 10 100 'solid 'red)
                      0 0
                      (rectangle 100 10 'solid 'blue))
      =>
      (overlay (rectangle 10 100 'solid 'red)
               (rectangle 100 10 'solid 'blue)))

(test (overlay/align/offset "center" "center"
                            (rectangle 10 100 'solid 'red)
                            0 0
                            (rectangle 100 10 'solid 'blue))
      =>
      (overlay/align "center" "center"
                     (rectangle 10 100 'solid 'red)
                     (rectangle 100 10 'solid 'blue)))

(test (overlay/align/offset "right" "top"
                            (rectangle 10 100 'solid 'red)
                            0 0
                            (rectangle 100 10 'solid 'blue))
      =>
      (overlay/align "right" "top"
                     (rectangle 10 100 'solid 'red)
                     (rectangle 100 10 'solid 'blue)))

(test (underlay/offset (rectangle 10 100 'solid 'red)
                       0 0
                       (rectangle 100 10 'solid 'blue))
      =>
      (underlay (rectangle 10 100 'solid 'red)
                (rectangle 100 10 'solid 'blue)))

(test (underlay/align/offset "center" "center"
                             (rectangle 10 100 'solid 'red)
                             0 0
                             (rectangle 100 10 'solid 'blue))
      =>
      (underlay/align "center" "center"
                      (rectangle 10 100 'solid 'red)
                      (rectangle 100 10 'solid 'blue)))

(test (underlay/align/offset "left" "bottom"
                             (rectangle 10 100 'solid 'red)
                             0 0
                             (rectangle 100 10 'solid 'blue))
      =>
      (underlay/align "left" "bottom"
                      (rectangle 10 100 'solid 'red)
                      (rectangle 100 10 'solid 'blue)))

(test (empty-scene 185 100)
      =>
      (crop 0 0 185 100
            (overlay (rectangle 185 100 'outline (pen "black" 2 'solid 'round 'round))
                     (rectangle 185 100 'solid 'white))))


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;  testing normalization
;;

(test (normalize-shape (image-shape (ellipse 50 100 'solid 'red)))
      =>
      (make-translate 25 50 (make-ellipse 50 100 0 255 "red")))

(test (normalize-shape (make-overlay (image-shape (ellipse 50 100 'solid 'red))
                                     (image-shape (ellipse 50 100 'solid 'blue))))
      =>
      (make-overlay (image-shape (ellipse 50 100 'solid 'red))
                    (image-shape (ellipse 50 100 'solid 'blue))))

(test (normalize-shape (make-overlay
                        (make-overlay (image-shape (ellipse 50 100 'solid 'red))
                                      (image-shape (ellipse 50 100 'solid 'blue)))
                        (image-shape (ellipse 50 100 'solid 'green))))
      =>
      (make-overlay 
       (make-overlay (make-translate 25 50 (make-ellipse 50 100 0 255 "red"))
                     (make-translate 25 50 (make-ellipse 50 100 0 255 "blue")))
       (make-translate 25 50 (make-ellipse 50 100 0 255 "green"))))

(test (normalize-shape (make-overlay
                        (image-shape (ellipse 50 100 'solid 'green))
                        (make-overlay (image-shape (ellipse 50 100 'solid 'red))
                                      (image-shape (ellipse 50 100 'solid 'blue)))))
      =>
      (make-overlay 
       (make-overlay (make-translate 25 50 (make-ellipse 50 100 0 255 "green"))
                     (make-translate 25 50 (make-ellipse 50 100 0 255 "red")))
       (make-translate 25 50 (make-ellipse 50 100 0 255 "blue"))))

(test (normalize-shape (make-translate 100 100 (image-shape (ellipse 50 100 'solid 'blue))))
      =>
      (make-translate 125 150 (make-ellipse 50 100 0 255 "blue")))

(test (normalize-shape (make-translate 10 20 (make-translate 100 100 (image-shape (ellipse 50 100 'solid 'blue)))))
      =>
      (make-translate 135 170 (make-ellipse 50 100 0 255 "blue")))

(test (normalize-shape (image-shape
                        (beside/align 'top
                                      (rectangle 10 10 'solid 'black)
                                      (crop 0 0 5 5 (rectangle 10 10 'solid 'green)))))
      =>
      (make-overlay
       (make-polygon
        (list (make-point 0 0)
              (make-point 10 0)
              (make-point 10 10)
              (make-point 0 10))
        255
        "black")
       (make-crop
        (list (make-point 10 0)
              (make-point 15 0)
              (make-point 15 5)
              (make-point 10 5))
        (make-polygon
         (list (make-point 10 0)
               (make-point 20 0)
               (make-point 20 10)
               (make-point 10 10))
         255
         "green"))))



;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;  testing rotating
;;

(test (bring-between 123 360) => 123)
(test (bring-between 365 360) => 5)
(test (bring-between -5 360) => 355)
(test (bring-between 720 360) => 0)
(test (bring-between 720.5 360) => .5)

(test (equal~? (rotate 90 (rectangle 100 100 'solid 'blue))
               (rectangle 100 100 'solid 'blue)
               .1)
      =>
      #t)

(test (round-numbers
       (normalize-shape (image-shape (rotate 90 (rotate 90 (rectangle 50 100 'solid 'purple))))))
      =>
      (round-numbers
       (normalize-shape (image-shape (rotate 180 (rectangle 50 100 'solid 'purple))))))

(test (round-numbers (normalize-shape (image-shape (rotate 90 (ellipse 10 10 'solid 'red)))))
      =>
      (round-numbers (normalize-shape (image-shape (ellipse 10 10 'solid 'red)))))

(test (round-numbers (normalize-shape (image-shape (rotate 90 (ellipse 10 12 'solid 'red)))))
      =>
      (round-numbers (normalize-shape (image-shape (ellipse 12 10 'solid 'red)))))

(test (round-numbers (normalize-shape (image-shape (rotate 135 (ellipse 10 12 'solid 'red)))))
      =>
      (round-numbers (normalize-shape (image-shape (rotate 45 (ellipse 12 10 'solid 'red))))))

(test (round-numbers (rotate -90 (ellipse 200 400 'solid 'purple)))
      =>
      (round-numbers (rotate 90 (ellipse 200 400 'solid 'purple))))

(test (equal~? (rectangle 100 10 'solid 'red)
               (rotate 90 (rectangle 10 100 'solid 'red))
               0.1)
      =>
      #t)

(test (equal~? (rectangle 100 10 'solid 'red)
               (rotate 90 (rectangle 10.0001 100.0001 'solid 'red))
               0.1)
      =>
      #t)

(test (equal~? (rotate 
                90
                (overlay/xy (rectangle 20 100 'solid 'purple)
                            20 0
                            (ellipse 40 40 'solid 'orange)))
               (overlay/xy (rectangle 100 20 'solid 'purple)
                           0 -40
                           (ellipse 40 40 'solid 'orange))
               .1)
      =>
      #t)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; scaling tests
;;

(test (scale 2 (rectangle 100 10 'solid 'blue))
      =>
      (rectangle 200 20 'solid 'blue))

(test (scale 3
             (overlay/xy (rectangle 100 10 'solid 'blue)
                         0
                         20
                         (rectangle 100 10 'solid 'red)))
      =>
      (overlay/xy (rectangle 300 30 'solid 'blue)
                  0
                  60
                  (rectangle 300 30 'solid 'red)))

(test (scale 3
             (overlay/xy (rectangle 100 10 'solid 'blue)
                         0
                         20
                         (overlay/xy (rectangle 100 10 'solid 'blue)
                                     0
                                     20
                                     (rectangle 100 10 'solid 'purple))))
      =>
      (overlay/xy (rectangle 300 30 'solid 'blue)
                  0
                  60
                  (overlay/xy (rectangle 300 30 'solid 'blue)
                              0
                              60
                              (rectangle 300 30 'solid 'purple))))

(test (scale/xy 3 4 (ellipse 30 60 'outline 'purple))
      =>
      (ellipse (* 30 3) (* 60 4) 'outline 'purple))


;; test scaling of bitmaps with alpha (in this case, a completely blank one)
(let ()
  (define bmp (make-bitmap 1 1))
  (define bdc (make-object bitmap-dc% bmp))
  (send bdc erase)
  (send bdc set-bitmap #f)
  (define i (make-object image-snip% bmp))
  (test (overlay i
                 (rectangle 1 1 'solid 'red))
        =>
        (rectangle 1 1 'solid 'red))
  (test (overlay (scale 2 i)
                 (rectangle 2 2 'solid 'red))
        =>
        (rectangle 2 2 'solid 'red)))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; misc tests
;;

(test (rectangle 100 10 'solid 'blue)
      =>
      (rectangle 100 10 "solid" "blue"))

(test (overlay (rectangle 100 10 'solid (color 255 0 0 0))
               (rectangle 100 10 'solid (color 0 255 0 255))
               (rectangle 100 10 'solid (color 0 0 255 0)))
      =>
      (rectangle 100 10 'solid (color 0 255 0)))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;  regular polygon
;;

;; note: the regular-polygon and the rectangle generate the points in reverse directions.
(test (round-numbers (regular-polygon 100 4 'outline 'green))
      =>
      (round-numbers (rectangle 100 100 'outline 'green)))

(test (swizzle (list 0 1 2 3 4) 2)
      =>
      (list 0 2 4 1 3))


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;  text
;;

(test (beside/align "baseline"
                    (text "a" 18 "black")
                    (text "b" 18 "black"))
      =>
      (text "ab" 18 "black"))

(test (round-numbers
       (image-width (rotate 45 (text "One" 18 'black))))
      =>
      (round-numbers
       (let ([t (text "One" 18 'black)])
         (image-width (rotate 45 (rectangle (image-width t) 
                                            (image-height t)
                                            'solid 'black))))))

(test (text "ab" 18 (make-color 0 0 255))
      =>
      (text "ab" 18 "blue"))

;; make sure this doesn't crash (there was a bug that would be triggered by drawing these guys)
(test (equal? (scale 0.1 (text "Howdy!" 12 'black))
              (scale 0.1 (text "Howdy!" 12 'red)))
      =>
      #f)
      
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; triangle
;;

(test (round-numbers (rotate 180 (isosceles-triangle 60 330 "solid" "lightseagreen")))
      =>
      (round-numbers (isosceles-triangle 60 30 "solid" "lightseagreen")))

(test (triangle 40 'outline 'black)
      =>
      (regular-polygon 40 3 'outline 'black))

(test (equal~? (rotate (+ 180 45) (right-triangle 50 50 'solid 'black))
               (isosceles-triangle 50 90 'solid 'black)
               0.001)
      =>
      #t)

(test (equal~? (triangle/ass 90 60 60 'solid 'red)
               (triangle/sss (* 60 (sqrt 2)) 60 60 'solid 'red)
               0.001)
      =>
      #t)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; square
;;

(test (square 10 'solid 'black)
      =>
      (rectangle 10 10 'solid 'black))


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; rhombus
;;

(test (equal~? (rhombus 10 90 'solid 'black)
               (rotate 45 (square 10 'solid 'black))
               0.01)
      =>
      #t)

(test (equal~? (rhombus 50 150 'solid 'black)
               (rotate 90 (rhombus 50 30 'solid 'black))
               0.01)
      =>
      #t)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; lines
;;

(test (image-width (line 10 20 'black))
      =>
      11)
(test (image-height (line 10 20 'black))
      =>
      21)

(test (round-numbers (rotate 90 (line 10 20 'black)))
      =>
      (round-numbers (line 20 -10 'black)))

(test (round-numbers (line 20 30 "red"))
      =>
      (round-numbers (rotate 180 (line 20 30 "red"))))

(test (round-numbers (line -30 20 "red"))
      =>
      (round-numbers (line 30 -20 "red")))

(test (image-width (add-line (rectangle 100 200 'solid 'black)
                             10 10 90 190 "red"))
      =>
      100)
(test (image-height (add-line (rectangle 100 200 'solid 'black)
                              10 10 90 190 "red"))
      =>
      200)
(test (image-width (add-line (rectangle 100 200 'solid 'black)
                             10 10 200 200 "red"))
      =>
      200)
(test (image-height (add-line (rectangle 100 200 'solid 'black)
                              10 10 200 200 "red"))
      =>
      200)

(test (image-width (add-line (rectangle 100 200 'solid 'black)
                             10 10 300 300 "red"))
      =>
      300)
(test (image-height (add-line (rectangle 100 200 'solid 'black)
                              10 10 300 300 "red"))
      =>
      300)

(test (image-width (add-line (rectangle 100 200 'solid 'black)
                             -10 10 100 200 "red"))
      =>
      110)
(test (image-height (add-line (rectangle 100 200 'solid 'black)
                              -10 10 100 200 "red"))
      =>
      200)

(test (image-width (add-line (rectangle 100 200 'solid 'black)
                             10 -10 100 200 "red"))
      =>
      100)
(test (image-height (add-line (rectangle 100 200 'solid 'black)
                              10 -10 100 200 "red"))
      =>
      210)

(test (image-width (add-line (rectangle 100 200 'solid 'black)
                             100 200 10 -10 "red"))
      =>
      100)
(test (image-height (add-line (rectangle 100 200 'solid 'black)
                              100 200 10 -10 "red"))
      =>
      210)

(test (image-width (add-line (rectangle 100 200 'solid 'black)
                             100 200 -10 10 "red"))
      =>
      110)
(test (image-height (add-line (rectangle 100 200 'solid 'black)
                              100 200 -10 10 "red"))
      =>
      200)

(let* ([txt (text "H" 24 'black)]
       [bl (image-baseline txt)])
  (test (image-baseline (add-line txt 0 0 100 100 'red))
        =>
        bl))

(let* ([txt (text "H" 24 'black)]
       [bl (image-baseline txt)])
  (test (image-baseline (add-line txt 0 -10 100 100 'red))
        =>
        (+ bl 10)))

(test (scene+line (rectangle 100 100 'solid 'black)
                  10 10 
                  90 50
                  "red")
      =>
      (add-line (rectangle 100 100 'solid 'black)
                10 10 
                90 50
                "red"))

(test (image-width (scene+line (rectangle 100 100 'solid 'black)
                               -10 -20
                               110 120
                               "green"))
      =>
      100)
(test (image-height (scene+line (rectangle 100 100 'solid 'black)
                               -10 -20
                               110 120
                               'purple))
      =>
      100)
(test (image-baseline (scene+line (rectangle 100 100 'solid 'black)
                                  -10 -20
                                  110 120
                                  'olive))
      =>
      100)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;  curves
;;

;; make sure a curve stays roughly in the middle pixels by
;; covering up a white curve with a thin black bar
(test (overlay/align 'middle
                     'middle 
                     (rectangle 82 2 'solid 'black)
                     (add-curve (rectangle 100 20 'solid 'black)
                                10 10 0 1/4
                                90 10 0 1/4 
                                'white))
                      
      =>
      (rectangle 100 20 'solid 'black))

;; and then make sure the curve actually draws something ...
(test (not (equal? (add-curve (rectangle 100 20 'solid 'black)
                              10 10 0 1/4
                              90 10 0 1/4 
                              'white)
                   (rectangle 100 20 'solid 'black)))
      =>
      #t)

(test (scale 2
             (add-curve 
              (rectangle 100 100 'solid 'black)
              20 20 0 1/3 80 80 0 1/3 'white))
      =>
      (add-curve 
       (rectangle 200 200 'solid 'black)
       40 40 0 1/3 160 160 0 1/3 'white))

(test (rotate 
       90
       (add-curve 
        (rectangle 100 100 'solid 'black)
        20 20 0 1/3 80 80 0 1/3 'white))
      =>
      (add-curve 
       (rectangle 100 100 'solid 'black)
       20 80 90 1/3 80 20 90 1/3 'white))

(test (add-curve (rectangle 100 100 'solid 'black)
                 10 10 0 1/4
                 90 90 0 1/4
                 'white)
      =>
      (scene+curve (rectangle 100 100 'solid 'black)
                   10 10 0 1/4
                   90 90 0 1/4
                   'white))
(test (scene+curve (rectangle 100 100 'solid 'black)
                   10 10 0 1/4
                   110 110 0 1/4
                   'red)
      
      =>
      (crop 0 0 100 100
            (add-curve (rectangle 100 100 'solid 'black)
                       10 10 0 1/4
                       110 110 0 1/4
                       'red)))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;  bitmap tests
;;

(test (clamp-1 0 3 5)
      => 3)
(test (clamp-1 0 0 5)
      => 0)
(test (clamp-1 0 -2 5)
      => 0)
(test (clamp-1 0 4 5)
      => 4)
(test (clamp-1 0 7 5)
      => 4)

(test (build-bytes 5 sqr)
      => (list->bytes '(0 1 4 9 16)))


(define onePixel (list->bytes '(255 0 0 255)))
;(call-with-values (λ () (scale onePixel 1 1 100)) show-bitmap)

(define blue2x1 (list->bytes '(255 0 0 255   255 0 255 0)))
;(call-with-values (λ () (scale blue2x1 2 1 20)) show-bitmap)

(define blue2x2 (list->bytes '(255 0 0 255   255 0 0 255   255 0 0 255   255 0 0 255)))
(define gray2x2 (list->bytes '(255 100 100 100   255 100 100 100   255 100 100 100   255 100 100 100)))
;; Some blue x green checkerboards:
(define checker2x2 (list->bytes '(255 0 0 255   255 0 255 0
                                      255 0 255 0   255 0 0 255)))
(define checker3x3 (list->bytes '(255 0 0 255   255 0 255 0    255 0 0 255
                                      255 0 255 0   255 0 0 255    255 0 255 0
                                      255 0 0 255   255 0 255 0    255 0 0 255 )))


(test (bmbytes-ref/safe checker3x3 3 3 0 0)   => (list->bytes '(255 0 0 255)))
(test (bmbytes-ref/safe checker3x3 3 3 1 1)   => (list->bytes '(255 0 0 255)))
(test (bmbytes-ref/safe checker3x3 3 3 2 2)   => (list->bytes '(255 0 0 255)))
(test (bmbytes-ref/safe checker3x3 3 3 1 2)   => (list->bytes '(255 0 255 0)))
(test (bmbytes-ref/safe checker3x3 3 3 0 3)   => (list->bytes '(  0 0 0 255)))
(test (bmbytes-ref/safe checker3x3 3 3 -1 -1) => (list->bytes '(  0 0 0 255)))
(test (bmbytes-ref/safe checker3x3 3 3 -1 1)  => (list->bytes '(  0 0 255 0)))
(test (bmbytes-ref/safe checker3x3 3 3 1 19)  => (list->bytes '(  0 0 255 0)))

#;
(test (bytes->list (interpolate checker2x2 2 2 1 0))
      =>
      '(255 0 255 0))

#;
(test (bytes->list (interpolate checker3x3 3 3 0 0))
      =>
      '(255 0 0 255))

#;
(test (bytes->list (interpolate checker3x3 3 3 0 1))
      =>
      '(255 0 255 0))

#;
(test (bytes->list (interpolate checker3x3 3 3 0 2))
      =>
      '(255 0 0 255))

#;
(test (bytes->list (interpolate checker3x3 3 3 0.5 0))
      =>
      '(255 0 128 128))

(test (image-width (bitmap icons/stop-16x16.png))
      =>
      16)
(test (image-height (bitmap icons/stop-16x16.png))
      =>
      16)

(test (let ()
        (define bmp (make-bitmap 4 4))
        (define mask (make-bitmap 4 4))
        (define bdc (make-object bitmap-dc% bmp))
        (send bdc set-brush "black" 'solid)
        (send bdc draw-rectangle 0 0 4 4)
        (send bdc set-bitmap mask)
        (send bdc set-brush "black" 'solid)
        (send bdc clear)
        (send bdc draw-rectangle 1 1 1 1)
        (send bdc set-bitmap #f)
        (let-values ([(bytes w h) (bitmap->bytes bmp mask)])
          bytes))
      =>
      (bytes-append #"\377\0\0\0" #"\377\0\0\0"   #"\377\0\0\0" #"\377\0\0\0"
                    #"\377\0\0\0" #"\377\0\0\0"   #"\377\0\0\0" #"\377\0\0\0"
                    #"\377\0\0\0" #"\377\0\0\0"   #"\377\0\0\0" #"\377\0\0\0"
                    #"\377\0\0\0" #"\377\0\0\0"   #"\377\0\0\0" #"\377\0\0\0"))

;; ensure no error
(test (begin (scale 2 (make-bitmap 10 10))
             (void))
      =>
      (void))


(define (fill-bitmap b color [x 0] [y 0] [w (send b get-width)] [h (send b get-height)])
  (let ([bdc (make-object bitmap-dc% b)])
    (send bdc set-brush color 'solid)
    (send bdc set-pen color 1 'transparent)
    (send bdc draw-rectangle x y w h)
    (send bdc set-bitmap #f)))

(define blue-10x20-bitmap (make-bitmap 10 20))
(fill-bitmap blue-10x20-bitmap "blue")
(define blue-20x10-bitmap (make-bitmap 20 10))
(fill-bitmap blue-20x10-bitmap "blue")
(define blue-20x40-bitmap (make-bitmap 20 40))
(fill-bitmap blue-20x40-bitmap "blue")

(define green-blue-10x20-bitmap (make-bitmap 10 20))
(fill-bitmap green-blue-10x20-bitmap "green")
(fill-bitmap green-blue-10x20-bitmap "blue" 0 0 10 10)

(define green-blue-20x10-bitmap (make-bitmap 20 10))
(fill-bitmap green-blue-20x10-bitmap "green")
(fill-bitmap green-blue-20x10-bitmap "blue" 10 0 10 10)

(test (image-width (image-snip->image (make-object image-snip% blue-10x20-bitmap)))
      => 
      10)
(test (image-height (image-snip->image (make-object image-snip% blue-10x20-bitmap)))
      => 
      20)
(test (image-baseline (image-snip->image (make-object image-snip% blue-10x20-bitmap)))
      => 
      20)

(define (close-enough i1 i2)
  (define w (image-width i1))
  (define h (image-height i1))
  (cond
    [(and (= w (image-width i2))
          (= h (image-height i2)))
     (define b1 (make-bytes (* w h 4)))
     (define b2 (make-bytes (* w h 4)))
     (define bm (make-bitmap w h))
     (define bdc (make-object bitmap-dc% bm))
     (render-image i1 bdc 0 0)
     (send bdc get-argb-pixels 0 0 w h b1)
     (send bdc erase)
     (render-image i2 bdc 0 0)
     (send bdc get-argb-pixels 0 0 w h b2)
     (define diff 0)
     (for ([x (in-range 0 (bytes-length b1))])
       (set! diff (+ diff (abs (- (bytes-ref b1 x)
                                  (bytes-ref b2 x))))))
     (define avg-diff (/ diff (bytes-length b1)))
     (<= avg-diff 10)]
    [else #f]))
       

(test (close-enough (rotate 90 (make-object image-snip% blue-10x20-bitmap))
                    (image-snip->image (make-object image-snip% blue-20x10-bitmap)))
      => #t)
      
(test (close-enough (rotate 90 (make-object image-snip% green-blue-20x10-bitmap))
                    (image-snip->image (make-object image-snip% green-blue-10x20-bitmap)))
      => #t)

(test (rotate 90 (rotate 90 (make-object image-snip% green-blue-20x10-bitmap)))
      =>
      (rotate 180 (make-object image-snip% green-blue-20x10-bitmap)))

(test (rotate 90 (flip-vertical (rotate 90 (make-object image-snip% green-blue-20x10-bitmap))))
      =>
      (rotate 0 (make-object image-snip% green-blue-20x10-bitmap)))

;; there was a bug in the bounding box computation for scaled bitmaps that this test exposes
(test (image-width (frame (rotate 90 (scale 1/2 (bitmap icons/plt-logo-red-diffuse.png)))))
      =>
      128)

;; Rotation by 0 should produce an equivalent object
(test (rotate 0 (make-object image-snip% green-blue-20x10-bitmap))
      =>
      (to-img (make-object image-snip% green-blue-20x10-bitmap)))

;; make sure that raw image snips are equal to image snips
(let ([i1 (make-object image-snip% (collection-file-path "bug09.png" "icons"))]
      [i2 (make-object image-snip% (collection-file-path "bug09.png" "icons"))])
  (test (equal? (rotate 0 i1) i2) => #t)
  (test (equal? i1 (rotate 0 i2)) => #t))

(define-runtime-path u.png "u.png")
(let ()
  (define i (rotate 0 (make-object bitmap% u.png 'unknown/mask)))
  (define t (new text%))
  (send t insert i)
  (define bop (open-output-bytes))
  (void (send t save-port bop))
  (define bip (open-input-bytes (get-output-bytes bop)))
  (define t2 (new text%))
  (void (send t2 insert-port bip))
  (test (equal? (send t find-first-snip)
                (send t2 find-first-snip))
        =>
        #t))

(let ()
  (define i1 (rotate 0 (make-object bitmap% u.png 'unknown/mask)))
  (define i2 (rotate 0 (make-object bitmap% u.png 'unknown/alpha)))
  (test (equal? i1 i2) => #t))

(define (get-from-file f)
  (define t (new text%))
  (send t load-file f)
  (send t find-first-snip))

(define-runtime-path bmp-5.1.3.rktd "bmp-5.1.3.rktd")
(let ()
  (define b1 (get-from-file bmp-5.1.3.rktd))
  (define b2 (get-from-file bmp-5.1.3.rktd))
  (test (image? b1) => #t)
  ;; test that the drawing code doesn't crash (since the images are not
  ;; eq?, they'll be drawn to be compared)
  (test (equal? b1 b2) => #t))

(define-runtime-path bmp-5.0.1.rktd "bmp-5.0.1.rktd")
(let ()
  (define b1 (get-from-file bmp-5.0.1.rktd))
  (define b2 (get-from-file bmp-5.0.1.rktd))
  (test (image? b1) => #t)
  (test (equal? b1 b2) => #t))


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; cropping (and place-image)
;;

(test (crop 0 0 10 10 (rectangle 20 20 'solid 'black))
      =>
      (rectangle 10 10 'solid 'black))

(test (equal~? (crop 0 0 40 40 (circle 40 'solid 'red))
               (rotate 180 (crop 40 40 40 40 (circle 40 'solid 'red)))
               0.1)
      =>
      #t)

(test (beside/align 'middle
                    (rectangle 10 10 'solid 'black)
                    (crop 0 0 10 10 (rectangle 10 10 'solid 'green)))
      =>
      (beside/align 'middle
                    (rectangle 10 10 'solid 'black)
                    (rectangle 10 10 'solid 'green)))

(test (place-image/align (circle 4 'solid 'black)
                         10 10
                         'left 'top
                         (rectangle 40 40 'solid 'orange))
      =>
      (underlay/xy (rectangle 40 40 'solid 'orange)
                   10 10
                   (circle 4 'solid 'black)))

(test (place-image/align (circle 4 'solid 'black)
                         50 50
                         'left 'top
                         (rectangle 40 40 'solid 'orange))
      =>
      (rectangle 40 40 'solid 'orange))

(test (place-image/align (circle 4 'solid 'black)
                         36 36
                         'left 'top
                         (rectangle 40 40 'solid 'orange))
      =>
      (underlay/xy (rectangle 40 40 'solid 'orange)
                   36 36
                   (crop 0 0 4 4 (circle 4 'solid 'black))))

(test (place-image/align (circle 8 'solid 'black)
                         -4 -4
                         'left 'top
                         (rectangle 40 40 'solid 'orange))
      =>
      (overlay/xy (crop 4 4 16 16 (circle 8 'solid 'black))
                  0 0
                  (rectangle 40 40 'solid 'orange)))

(test (place-image/align (circle 4 'solid 'black)
                         -4 0
                         'left 'top
                         (rectangle 40 40 'solid 'orange))
      =>
      (overlay/xy (crop 4 0 4 8 (circle 4 'solid 'black))
                  0 0
                  (rectangle 40 40 'solid 'orange)))

(test (place-image/align (circle 4 'solid 'black)
                         5 10 'center 'center
                         (rectangle 40 40 'solid 'orange))
      =>
      (underlay/xy (rectangle 40 40 'solid 'orange)
                   1 6
                   (circle 4 'solid 'black)))


(test (place-image/align (circle 4 'solid 'black)
                         10 15 'right 'bottom
                         (rectangle 40 40 'solid 'orange))
      =>
      (underlay/xy (rectangle 40 40 'solid 'orange)
                   2 7
                   (circle 4 'solid 'black)))

;; this test case checks to make sure the number of crops doesn't 
;; grow when normalizing shapes.

(let* ([an-image 
        (crop
         0 0 50 50
         (crop
          0 10 60 60
          (crop
           10 0 60 60
           (overlay
            (overlay
             (ellipse 20 50 'solid 'red)
             (ellipse 30 40 'solid 'black))
            (overlay
             (ellipse 20 50 'solid 'red)
             (ellipse 30 40 'solid 'black))))))]
       [an-image+crop
        (crop 5 5 10 10 an-image)])
  
  (define (count-crops s)
    (define crops 0)
    (let loop ([s s])
      (when (crop? s)
        (set! crops (+ crops 1)))
      (when (struct? s)
        (for-each loop (vector->list (struct->vector s)))))
    crops)
  
  (test (+ (count-crops (normalize-shape (image-shape an-image))) 1)
        =>
        (count-crops (normalize-shape (image-shape an-image+crop)))))

(test (image-width (crop 0 0 101 61 (rectangle 100 60 'outline 'black)))
      =>
      101)
(test (image-height (crop 0 0 101 61 (rectangle 100 60 'outline 'black)))
      => 
      61)
(test (image-width (crop -1 -1 12 12 (rectangle 10 10 'outline (pen "black" 2 "solid" "round" "round"))))
      =>
      12)
(test (image-height (crop -1 -1 12 12 (rectangle 10 10 'outline (pen "black" 4 "solid" "round" "round"))))
      =>
      12)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;  flipping
;;

(test (flip-horizontal (rotate -30 (rectangle 100 10 'solid 'red)))
      =>
      (rotate 30 (rectangle 100 10 'solid 'red)))

(test (flip-vertical (rotate -30 (rectangle 100 10 'solid 'red)))
      =>
      (rotate 30 (rectangle 100 10 'solid 'red)))
(test (flip-vertical
       (rotate
        -30
        (overlay (rectangle 100 10 'solid 'red)
                 (ellipse 10 100 'solid 'blue))))
      =>
      (rotate
       30
       (overlay (rectangle 100 10 'solid 'red)
                (ellipse 10 100 'solid 'blue))))
(test (flip-horizontal (overlay/xy (rectangle 100 10 'solid 'red)
                                   10 10
                                   (ellipse 10 100 'solid 'blue)))
      =>
      (overlay/xy (rectangle 100 10 'solid 'red)
                  80 10
                  (ellipse 10 100 'solid 'blue)))
(test (flip-vertical (overlay/xy (rectangle 100 10 'solid 'red)
                                 10 10
                                 (ellipse 10 100 'solid 'blue)))
      =>
      (overlay/xy (rectangle 100 10 'solid 'red)
                  10 -100
                  (ellipse 10 100 'solid 'blue)))

(test (flip-vertical (add-curve (rectangle 200 100 'solid 'black)
                                20 20 0 1
                                180 80 -90 1/3
                                "white"))
      =>
      (add-curve (rectangle 200 100 'solid 'black)
                 20 80 0 1
                 180 20 90 1/3
                 "white"))

(let* ([bdc (make-object bitmap-dc%)]
       [bm-ul (make-bitmap 10 10)]
       [bm-ur (make-bitmap 10 10)]
       [bm-ll (make-bitmap 10 10)])
  (send bdc set-bitmap bm-ul)
  (send bdc set-pen "red" 1 'transparent)
  (send bdc set-brush "red" 'solid)
  (send bdc clear)
  (send bdc draw-rectangle 0 0 5 5)
  (send bdc set-bitmap bm-ur)
  (send bdc set-pen "red" 1 'solid)
  (send bdc clear)
  (send bdc draw-rectangle 5 0 5 5)
  (send bdc set-bitmap bm-ll)
  (send bdc clear)
  (send bdc draw-rectangle 0 5 5 5)
  (send bdc set-bitmap #f)
  (test (flip-vertical bm-ul) => (to-img bm-ll))
  (test (flip-horizontal bm-ul) => (to-img bm-ur)))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; pen arguments
;;

;; just make sure no errors.
(test (image? (polygon (list (make-posn 0 0)
                             (make-posn 100 100)
                             (make-posn 100 0)
                             (make-posn 0 100))
                       "outline"
                       (make-pen "darkslategray" 6 "solid" "round" "round")))
      =>
      #t)

(test (image? (line 10 
                    10 
                    (make-pen "darkslategray" 6 "solid" "round" "round")))
      =>
      #t)

(test (scale 2
             (polygon (list (make-posn 0 0)
                            (make-posn 100 0)
                            (make-posn 100 100))
                      "outline"
                      (make-pen "black" 6 "solid" "round" "round")))
      =>
      (polygon (list (make-posn 0 0)
                     (make-posn 200 0)
                     (make-posn 200 200))
               "outline"
               (make-pen "black" 12 "solid" "round" "round")))

(test (scale 2
             (ellipse 30 40 "outline"
                      (make-pen "black" 2 "solid" "round" "round")))
      =>
      (ellipse 60 80 "outline"
               (make-pen "black" 4 "solid" "round" "round")))

(test (scale 2
             (polygon (list (make-posn 0 0)
                            (make-posn 100 0)
                            (make-posn 100 100))
                      "outline"
                      (make-pen "black" 0 "solid" "round" "round")))
      =>
      (polygon (list (make-posn 0 0)
                     (make-posn 200 0)
                     (make-posn 200 200))
               "outline"
               (make-pen "black" 0 "solid" "round" "round")))

(test (scale 2
             (add-line
              (rectangle 100 100 'solid 'black)
              20 20 80 80
              (make-pen "black" 6 "solid" "round" "round")))
      =>
      (add-line
       (rectangle 200 200 'solid 'black)
       40 40 160 160
       (make-pen "black" 12 "solid" "round" "round")))

(test (scale 2
             (add-curve
              (rectangle 100 100 'solid 'black)
              20 20 0 1/2
              80 80 0 1/2
              (make-pen "black" 6 "solid" "round" "round")))
      =>
      (add-curve
       (rectangle 200 200 'solid 'black)
       40 40 0 1/2
       160 160 0 1/2
       (make-pen "black" 12 "solid" "round" "round")))

(test (add-line (rectangle 30 30 "outline" "black")
                0 0 30 30 
                (make-pen (make-color 0 0 0 255) 15 "solid" "butt" "round"))
      =>
      (add-line (rectangle 30 30 "outline" "black")
                0 0 30 30 
                (make-pen "black" 15 "solid" "butt" "round")))

(test (image->color-list
       (above (beside (rectangle 1 1 'solid (color 1 1 1))
                      (rectangle 1 1 'solid (color 2 2 2))
                      (rectangle 1 1 'solid (color 3 3 3)))
              (beside (rectangle 1 1 'solid (color 4 4 4))
                      (rectangle 1 1 'solid (color 5 5 5))
                      (rectangle 1 1 'solid (color 6 6 6)))))
      =>
      (list (color 1 1 1) (color 2 2 2) (color 3 3 3) 
            (color 4 4 4) (color 5 5 5) (color 6 6 6)))

(test (color-list->bitmap
       (list (color 1 1 1) (color 2 2 2) (color 3 3 3) 
             (color 4 4 4) (color 5 5 5) (color 6 6 6))
       3 2)
      =>
      (above (beside (rectangle 1 1 'solid (color 1 1 1))
                     (rectangle 1 1 'solid (color 2 2 2))
                     (rectangle 1 1 'solid (color 3 3 3)))
             (beside (rectangle 1 1 'solid (color 4 4 4))
                     (rectangle 1 1 'solid (color 5 5 5))
                     (rectangle 1 1 'solid (color 6 6 6)))))

(let ([has-color? 
       (λ (img) 
         (ormap (λ (x) (or (not (equal? (color-red x)
                                        (color-green x)))
                           (not (equal? (color-red x)
                                        (color-blue x)))))
                (image->color-list img)))])
  (test (has-color? (place-image (rectangle 1 10 "solid" "red") 2 10
                                 (empty-scene 5 20)))
        =>
        #t))

(test (image->color-list
       (overlay
        (color-list->bitmap 
         (list (color 0 0 0 0)
               (color 0 0 255 255))
         1 2)
        (color-list->bitmap 
         (list (color 255 0 0 255)
               (color 0 0 0 0))
         1 2)))
      =>
      (list (color 255 0 0 255) 
            (color 0 0 255 255)))

(let ([i 
       (overlay (circle 20 'solid 'red)
                (rectangle 10 60 'solid 'blue))])
  (test (freeze i)
        => 
        i))

(test (freeze 10 10 (rectangle 20 20 'solid 'blue))
      =>
      (rectangle 10 10 'solid 'blue))

(test (freeze 5 5 10 10 (rectangle 20 20 'solid 'blue))
      =>
      (rectangle 10 10 'solid 'blue))

(test (freeze 5 7 12 10 (rectangle 20 20 'solid 'blue))
      =>
      (rectangle 12 10 'solid 'blue))

(let ()
  (define bkg (rectangle 12 12 'solid 'white))
  (define i1 (overlay/xy 
              (freeze 0 0 11 11 (rectangle 10 10 'outline 'orange))
              0 0
              bkg))
  (define i2 (overlay/xy
              (rectangle 10 10 'outline 'orange)
              0 0
              bkg))
  (test i1 => i2))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;  test pinholes.
;;

(test (pinhole-x (rectangle 10 10 'solid 'blue)) => #f)
(test (pinhole-y (rectangle 10 10 'solid 'blue)) => #f)
(test (pinhole-x (put-pinhole 2 3 (rectangle 10 10 'solid 'blue))) => 2)
(test (pinhole-y (put-pinhole 2 3 (rectangle 10 10 'solid 'blue))) => 3)
(test (pinhole-x (center-pinhole (rectangle 10 24 'solid 'blue))) => 5)
(test (pinhole-y (center-pinhole (rectangle 10 24 'solid 'blue))) => 12)
(test (pinhole-x (clear-pinhole (center-pinhole (rectangle 10 24 'solid 'blue)))) => #f)
(test (pinhole-y (clear-pinhole (center-pinhole (rectangle 10 24 'solid 'blue)))) => #f)
(test (pinhole-x (clear-pinhole (rectangle 10 24 'solid 'blue))) => #f)
(test (pinhole-y (clear-pinhole (rectangle 10 24 'solid 'blue))) => #f)

(test (pinhole-x (scale 11 (center-pinhole (rectangle 10 24 'solid 'blue))))
      =>
      55)
(test (pinhole-y (scale 11 (center-pinhole (rectangle 10 24 'solid 'blue))))
      =>
      132)
(test (round-numbers (pinhole-x (rotate 90 (center-pinhole (rectangle 40 20 'solid 'red)))))
      =>
      10.0)
(test (round-numbers (pinhole-y (rotate 90 (center-pinhole (rectangle 40 20 'solid 'red)))))
      =>
      20.0)
(test (pinhole-x (flip-vertical (put-pinhole 1 2 (rectangle 10 20 'solid 'red))))
      =>
      1)
(test (pinhole-y (flip-vertical (put-pinhole 1 2 (rectangle 10 20 'solid 'red))))
      =>
      18)
(check-= (pinhole-x (flip-horizontal (put-pinhole 1 2 (rectangle 10 20 'solid 'red))))
         9.0
         0)
(check-= (pinhole-y (flip-horizontal (put-pinhole 1 2 (rectangle 10 20 'solid 'red))))
         2.0
         0)
(test (equal? (center-pinhole (rectangle 10 12 'solid 'blue))
              (rectangle 10 12 'solid 'blue))
      =>
      #f)
(test (equal? (center-pinhole (rectangle 10 12 'solid 'blue))
              (put-pinhole 5 6 (rectangle 10 12 'solid 'blue)))
      =>
      #t)
(test (pinhole-x (add-line (center-pinhole (rectangle 100 120 'solid 'red)) 10 10 20 20 'blue))
      =>
      50)
(test (pinhole-y (add-line (center-pinhole (rectangle 100 120 'solid 'red)) 10 10 20 20 'blue))
      =>
      60)
(test (pinhole-x (add-curve (center-pinhole (rectangle 100 120 'solid 'red)) 
                            10 10 30 1/2
                            20 20 60 1/2
                            'white))
      =>
      50)
(test (pinhole-y (add-curve (center-pinhole (rectangle 100 120 'solid 'red)) 
                            10 10 30 1/2
                            20 20 60 1/2
                            'white))
      =>
      60)

(test (pinhole-x (scene+line (center-pinhole (rectangle 100 120 'solid 'red)) 10 10 20 20 'blue))
      =>
      50)
(test (pinhole-y (scene+line (center-pinhole (rectangle 100 120 'solid 'red)) 10 10 20 20 'blue))
      =>
      60)
(test (pinhole-x (scene+curve (center-pinhole (rectangle 100 120 'solid 'red)) 
                              10 10 30 1/2
                              20 20 60 1/2
                              'white))
      =>
      50)
(test (pinhole-y (scene+curve (center-pinhole (rectangle 100 120 'solid 'red)) 
                              10 10 30 1/2
                              20 20 60 1/2
                              'white))
      =>
      60)

(test (pinhole-x (crop 2 2 8 10
                       (center-pinhole (rectangle 10 12 'solid 'red))))
      =>
      3)
(test (pinhole-y (crop 2 2 8 10
                       (center-pinhole (rectangle 10 12 'solid 'red))))
      =>
      4)

(test (pinhole-x (frame (center-pinhole (rectangle 10 12 'solid 'red))))
      =>
      5)
(test (pinhole-y (frame (center-pinhole (rectangle 10 12 'solid 'red))))
      =>
      6)

(test (pinhole-x (overlay (put-pinhole 1 2 (rectangle 10 100 'solid 'red))
                          (put-pinhole 75 9 (rectangle 100 10 'solid 'blue))))
      =>
      46)
(test (pinhole-y (overlay (put-pinhole 1 2 (rectangle 10 100 'solid 'red))
                          (put-pinhole 75 9 (rectangle 100 10 'solid 'blue))))
      =>
      2)
(test (pinhole-x (overlay (put-pinhole 75 9 (rectangle 100 10 'solid 'blue))
                          (put-pinhole 1 2 (rectangle 10 100 'solid 'red))))
      =>
      75)
(test (pinhole-y (overlay (put-pinhole 75 9 (rectangle 100 10 'solid 'blue))
                          (put-pinhole 1 2 (rectangle 10 100 'solid 'red))))
      =>
      54)
(test (pinhole-x (overlay (rectangle 100 10 'solid 'blue)
                          (put-pinhole 1 2 (rectangle 10 100 'solid 'red))))
      =>
      #f)
(test (pinhole-y (overlay (rectangle 100 10 'solid 'blue)
                          (put-pinhole 1 2 (rectangle 10 100 'solid 'red))))
      =>
      #f)
(test (pinhole-x (beside (center-pinhole (rectangle 10 100 'solid 'red))
                         (center-pinhole (rectangle 100 10 'solid 'blue))))
      =>
      5)
(test (pinhole-y (beside (center-pinhole (rectangle 10 100 'solid 'red))
                         (center-pinhole (rectangle 100 10 'solid 'blue))))
      =>
      50)
(test (pinhole-x (above (center-pinhole (rectangle 10 100 'solid 'red))
                        (center-pinhole (rectangle 100 10 'solid 'blue))))
      =>
      50)
(test (pinhole-y (above (center-pinhole (rectangle 10 100 'solid 'red))
                        (center-pinhole (rectangle 100 10 'solid 'blue))))
      =>
      50)

(test (pinhole-x (place-image (center-pinhole (rectangle 10 100 'solid 'red))
                              0 0
                              (center-pinhole (rectangle 100 10 'solid 'blue))))
      =>
      50)
(test (pinhole-y (place-image (center-pinhole (rectangle 10 100 'solid 'red))
                              0 0
                              (center-pinhole (rectangle 100 10 'solid 'blue))))
      =>
      5)

(test (clear-pinhole
       (overlay/align "pinhole" 'pinhole
                      (center-pinhole (rectangle 40 100 'solid 'red))
                      (put-pinhole 0 0 (rectangle 100 40 'solid 'blue))))
      =>
      (overlay/xy (rectangle 40 100 'solid 'red)
                  20 50
                  (rectangle 100 40 'solid 'blue)))

(test (clear-pinhole
       (underlay/align "pinhole" 'pinhole
                       (center-pinhole (rectangle 40 100 'solid 'red))
                       (put-pinhole 100 40 (rectangle 100 40 'solid 'blue))))
      =>
      (underlay/xy (rectangle 40 100 'solid 'red)
                   -80 10
                   (rectangle 100 40 'solid 'blue)))

(test (clear-pinhole
       (beside/align "pinhole"
                     (center-pinhole (rectangle 100 40 'solid 'purple))
                     (center-pinhole (rectangle 40 100 'solid 'purple))))
      =>
      (beside (rectangle 100 40 'solid 'purple)
              (rectangle 40 100 'solid 'purple)))


(test (clear-pinhole
       (above/align "pinhole"
                    (center-pinhole (rectangle 100 40 'solid 'purple))
                    (center-pinhole (rectangle 40 100 'solid 'purple))))
      =>
      (above (rectangle 100 40 'solid 'purple)
             (rectangle 40 100 'solid 'purple)))

(test (clear-pinhole
       (place-image/align
        (center-pinhole (rectangle 100 10 'solid 'red))
        0 0 "pinhole" "pinhole"
        (center-pinhole (rectangle 10 100 'solid 'blue))))
      =>
      (place-image/align
       (rectangle 100 10 'solid 'red)
       0 0 "center" "center"
       (rectangle 10 100 'solid 'blue)))

(test (clear-pinhole
       (place-image/align
        (center-pinhole (rectangle 100 10 'solid 'red))
        0 0 "pinhole" "pinhole"
        (rectangle 10 100 'solid 'blue)))
      =>
      (place-image/align
       (rectangle 100 10 'solid 'red)
       0 0 "center" "center"
       (rectangle 10 100 'solid 'blue)))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;  test errors.
;;  mostly test that the extra mode check is there
;;

(test/exn (rectangle 10 10 "solid" (make-pen "black" 12 "solid" "round" "round"))
          =>
          #rx"^rectangle: expects an image-color")

(test/exn (rectangle 10 10 'solid (make-pen "black" 12 "solid" "round" "round"))
          =>
          #rx"^rectangle: expects an image-color")

(test/exn (circle 10 'solid (make-pen "black" 12 "solid" "round" "round"))
          =>
          #rx"^circle: expects an image-color")

(test/exn (ellipse 10 10 'solid (make-pen "black" 12 "solid" "round" "round"))
          =>
          #rx"^ellipse: expects an image-color")

(test/exn (triangle 10 'solid (make-pen "black" 12 "solid" "round" "round"))
          =>
          #rx"^triangle: expects an image-color")

(test/exn (right-triangle 10 12 'solid (make-pen "black" 12 "solid" "round" "round"))
          =>
          #rx"^right-triangle: expects an image-color")

(test/exn (isosceles-triangle 10 120 'solid (make-pen "black" 12 "solid" "round" "round"))
          =>
          #rx"^isosceles-triangle: expects an image-color")

(test/exn (square 10 'solid (make-pen "black" 12 "solid" "round" "round"))
          =>
          #rx"^square: expects an image-color")

(test/exn (rhombus 40 45 'solid (make-pen "black" 12 "solid" "round" "round"))
          =>
          #rx"^rhombus: expects an image-color")

(test/exn (regular-polygon 40 6 'solid (make-pen "black" 12 "solid" "round" "round"))
          =>
          #rx"^regular-polygon: expects an image-color")

(test/exn (star 40 'solid (make-pen "black" 12 "solid" "round" "round"))
          =>
          #rx"^star: expects an image-color")

(test/exn (star-polygon 40 7 3 'solid (make-pen "black" 12 "solid" "round" "round"))
          =>
          #rx"^star-polygon: expects an image-color")

(test/exn (polygon (list (make-posn 0 0) (make-posn 100 0) (make-posn 100 100))
                   'solid (make-pen "black" 12 "solid" "round" "round"))
          =>
          #rx"^polygon: expects an image-color")
(test/exn (polygon (list (make-posn 0 0+1i) (make-posn 100 0) (make-posn 100 100))
                   'solid (make-pen "black" 12 "solid" "round" "round"))
          =>
          #rx"^polygon: expects a list-of-posns-with-real-valued-x-and-y-coordinates")


(test/exn (save-image "tri.png" (triangle 50 "solid" "purple"))
          =>
          #rx"^save-image:")
(test/exn (save-svg-image "tri.png" (triangle 50 "solid" "purple"))
          =>
          #rx"^save-svg-image:")

(test/exn (pen 1 2 3 4 5)
          =>
          #rx"^pen:")

(test/exn (make-pen 1 2 3 4 5)
          =>
          #rx"^make-pen:")

(test/exn (make-color #f #f #f)
          =>
          #rx"^make-color:")
(test/exn (color #f #f #f)
          =>
          #rx"^color:")
(test/exn (color-list->bitmap
           (list (color 1 1 1) (color 2 2 2) (color 3 3 3) 
                 (color 4 4 4) (color 5 5 5) (color 6 6 6))
           3 3)
          =>
          #rx"^color-list->bitmap")

(test/exn (overlay/align
           "pinhole" "center"
           (center-pinhole (rectangle 10 100 'solid 'blue))
           (rectangle 100 10 'solid 'red))
          =>
          #rx"^overlay/align")
(test/exn (overlay/align
           "center" "pinhole" 
           (center-pinhole (rectangle 10 100 'solid 'blue))
           (rectangle 100 10 'solid 'red))
          =>
          #rx"^overlay/align")
(test/exn (overlay/align
           "pinhole" "center"
           (rectangle 100 10 'solid 'red)
           (center-pinhole (rectangle 10 100 'solid 'blue)))
          =>
          #rx"^overlay/align")
(test/exn (overlay/align
           "center" "pinhole" 
           (rectangle 100 10 'solid 'red)
           (center-pinhole (rectangle 10 100 'solid 'blue)))
          =>
          #rx"^overlay/align")

(test/exn (underlay/align
           "pinhole" "center"
           (center-pinhole (rectangle 10 100 'solid 'blue))
           (rectangle 100 10 'solid 'red))
          =>
          #rx"^underlay/align")
(test/exn (underlay/align
           "center" "pinhole" 
           (center-pinhole (rectangle 10 100 'solid 'blue))
           (rectangle 100 10 'solid 'red))
          =>
          #rx"^underlay/align")
(test/exn (underlay/align
           "pinhole" "center"
           (rectangle 100 10 'solid 'red)
           (center-pinhole (rectangle 10 100 'solid 'blue)))
          =>
          #rx"^underlay/align")
(test/exn (underlay/align
           "center" "pinhole" 
           (rectangle 100 10 'solid 'red)
           (center-pinhole (rectangle 10 100 'solid 'blue)))
          =>
          #rx"^underlay/align")


(test/exn (place-image/align
           (rectangle 100 10 'solid 'red)
           0 0 "pinhole" "center"
           (center-pinhole (rectangle 10 100 'solid 'blue)))
          =>
          #rx"^place-image/align")
(test/exn (place-image/align
           (rectangle 100 10 'solid 'red)
           0 0 "center" "pinhole" 
           (center-pinhole (rectangle 10 100 'solid 'blue)))
          =>
          #rx"^place-image/align")



(test/exn (above/align
           "pinhole" 
           (rectangle 100 10 'solid 'red)
           (center-pinhole (rectangle 10 100 'solid 'blue)))
          =>
          #rx"^above/align")
(test/exn (beside/align
           "pinhole" 
           (center-pinhole (rectangle 10 100 'solid 'blue))
           (rectangle 100 10 'solid 'red))
          =>
          #rx"^beside/align")

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;  testing the wxme connection for 2htdp/image images
;;

(let ()
  (define txt (new text%))
  (define img1 (overlay (rectangle 100 20 'solid 'red)
                        (rectangle 20 100 'solid 'red)))
  (define img2 
    (put-pinhole 50 
                 20
                 (overlay (rectangle 100 20 'solid 'red)
                          (rectangle 20 100 'solid 'red))))

  (send txt insert "(define img (list ")
  (send txt insert img1)
  (send txt insert " ")
  (send txt insert img2)
  (send txt insert "))")

  (define sp (open-output-string))
  (send txt save-port sp)
  (test (port->string (wxme-port->text-port (open-input-string (get-output-string sp))))
        =>
        "(define img (list . .))"))

(let ()
  (define txt (new text%))
  (define img1 (overlay (rectangle 100 20 'solid 'red)
                        (rectangle 20 200 'solid 'red)))
  (define img2 
    (put-pinhole 50 
                 20
                 (overlay (rectangle 200 20 'solid 'red)
                          (rectangle 20 100 'solid 'red))))
  (define img3 (text "Hello" 32 'black))

  (send txt insert "(")
  (send txt insert img1)
  (send txt insert " ")
  (send txt insert img2)
  (send txt insert " ")
  (send txt insert img3)
  (send txt insert ")")

  (define sp (open-output-string))
  (send txt save-port sp)
  (define washed (read (wxme-port->port (open-input-string (get-output-string sp)))))
  (test (list? washed) => #t)
  (test (map pinhole-x washed) => (list #f 50 #f))
  (test (map pinhole-y washed) => (list #f 20 #f))
  (test (image-width (car washed)) => 100)
  (test (image-height (car washed)) => 200)
  (test (image-baseline (car washed)) => 200)
  (test (equal? (image-baseline (list-ref washed 2))
                (image-height (list-ref washed 2)))
        =>
        #f))

(test (convertible? (circle 20 "solid" "red")) => #t)
(test (bytes? (convert (circle 20 "solid" "red") 'png-bytes)) => #t)
(let ()
  (define tmpfile (make-temporary-file "2htdpimage-test-~a"))
  (define i (circle 15 "solid" "red"))
  (call-with-output-file tmpfile
    (lambda (p)
      (display (convert i 'png-bytes) p))
    #:exists 'truncate)
  (define i2 (rotate 0 (read-bitmap tmpfile))) ;; add rotate to be sure we get an image so that equal? works properly
  (delete-file tmpfile)
  (test (image-width i2) => 30)
  (test (image-height i2) => 30)
  (test i2 => i))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;  random testing of normalization
;;    make sure normalization actually normalizes
;;    and that normalization doesn't introduce new structs
;;

(require redex/reduction-semantics)

(define-language 2htdp/image
  (image (rectangle size size mode color)
         (line coord coord color)
         (add-curve (rectangle size size mode color)
                    coord coord pull angle
                    coord coord pull angle
                    color)
         (overlay image image)
         (overlay/xy image coord coord image)
         (underlay image image)
         (underlay/xy image coord coord image)
         (let ([i image])
           (crop (max 0 (min (image-width i) coord))
                 (max 0 (min (image-height i) coord))
                 size
                 size
                 i))
         (scale/xy factor factor image)
         (scale factor image)
         (rotate angle image)
         (flip-vertical image)
         (flip-horizontal image)
         (bitmap bmp-spec))
  
  (bmp-spec icons/b-run.png
            icons/stop-16x16.png)

  (factor (+ 1 big-nat) 1/2 1/3 1/4) ;; scaling factors
  (size big-nat)
  (mode 'outline 'solid "outline" "solid")
  (color "red" 'red "blue" "orange" "green" "black")
  (coord big-int)
  (pull 0 1/2 1/3 2 (/ big-nat (+ 1 big-nat)))
  (angle 0 90 45 30 180 natural (* 4 natural))
  
  ; Redex tends to choose small numbers.
  (big-nat (+ (* 10 natural) natural))
  (big-int (+ (* 10 integer) integer)))

(define-namespace-anchor anchor)

;; scale-down : image -> image
;; scale image so that it is at most 10000 pixels in area
(define (scale-down img)
  (let* ([w (image-width img)]
         [h (image-height img)]
         [s (* w h)]
         [max-s (sqr 100)])
    (if (< s max-s)
        img
        (scale/xy (/ (sqrt max-s) w) 
                  (/ (sqrt max-s) h)
                  img))))

(define (image-struct-count obj)
  (let ([counts (make-hash)])
    (let loop ([obj obj])
      (when (struct? obj)
        (let ([stuff (vector->list (struct->vector obj))])
          (unless (member (car stuff) '(struct:flip struct:translate struct:scale)) ;; skip these because normalization eliminates them
            (hash-set! counts (car stuff) (+ 1 (hash-ref counts (car stuff) 0))))
          (for-each loop (cdr stuff)))))
    (sort (hash-map counts list) string<=? #:key (λ (x) (symbol->string (car x))))))

(define (check-image-properties img-sexp img)
  (let* ([raw-size (image-struct-count (image-shape img))]
         [normalized (normalize-shape (image-shape img))]
         [norm-size (image-struct-count normalized)]) 
    (unless (normalized-shape? normalized)
      (error 'test-image.rkt "found a non-normalized shape after normalization:\n~s" 
             img-sexp))
    (unless (equal? norm-size raw-size)
      (error 'test-image.rkt "found differing sizes for ~s:\n  ~s\n  ~s" 
             img-sexp raw-size norm-size))))

(time
 (redex-check
  2htdp/image
  image
  (check-image-properties 
   (term image)
   (to-img (eval (term image) (namespace-anchor->namespace anchor))))
  #:attempts 1000))


;; random testing finds differences here but they
;; seem to be due to imprecision in inexact arithmetic.
#;
(let ()
  (define w 200)
  (define h 200)
  (define bm1 (make-bitmap w h))
  (define bm2 (make-bitmap w h))
  (define bytes1 (make-bytes (* w h 4) 0))
  (define bytes2 (make-bytes (* w h 4) 0))
  (define bdc1 (make-object bitmap-dc% bm1))
  (define bdc2 (make-object bitmap-dc% bm2))
  
  (define (render-and-compare img)
    (send bdc1 erase)
    (send bdc2 erase)
    (parameterize ([render-normalized #f])
      (render-image img bdc1 10 10))
    (parameterize ([render-normalized #t])
      (render-image img bdc2 10 10))
    (send bdc1 get-argb-pixels 0 0 w h bytes1)
    (send bdc2 get-argb-pixels 0 0 w h bytes2)
    (equal? bytes1 bytes2))
  (time
   (redex-check
    2htdp/image
    image
    (render-and-compare (scale-down (eval (term image) (namespace-anchor->namespace anchor))))
    #:attempts 100)))

(define (test-save/load img fn)
  (let ([t1 (new text%)]
        [t2 (new text%)])
    (send t1 insert img)
    (send t1 save-file fn)
    (send t2 load-file fn)
    (let ([s1 (send t1 find-first-snip)]
          [s2 (send t2 find-first-snip)])
      (equal? s1 s2))))


#;
(time
 (let ([fn (make-temporary-file "test-image~a")])
   (redex-check
    2htdp/image
    image
    (let-values ([(ans real cpu gc)
                  (time-apply
                   (λ ()
                     (let ([img (to-img (eval (term image) (namespace-anchor->namespace anchor)))])
                       (test-save/load (scale-down img) fn)))
                   '())])
      (unless (car ans)
        (error 'test-image.rkt
               "saving and loading this image fails:\n  ~s"
               (term image)))
      (unless (< cpu 4000)
        (error 'test-image.rkt
               "saving and loading this image takes too longer than 4 seconds:\n  ~s"
               (term image))))
    #:attempts 1000)))

;;This expression was found by the above. Its problematic because it has a negative width.
#;
(begin
  (define i
   (let* ([b (rectangle 17 17 "solid" "black")]
          [i (overlay/xy b -37 40 b)])
     (rotate 30 (crop 54 30 20 10 i))))
  (image-width i) (image-height i) i)


#|

This was found by the first redex check above:

(let ((i (flip-horizontal 
          (let ((i (line (+ (* 10 1) -2) (+ (* 10 3) 4) "green")))
            (crop (max 0 (min (image-width i) (+ (* 10 4) 13)))
                  (max 0 (min (image-height i) (+ (* 10 2) 0)))
                  (+ (* 10 3) 2)
                  (+ (* 10 7) 0)
                  i)))))
  (crop (max 0 (min (image-width i) (+ (* 10 0) 2))) 
        (max 0 (min (image-height i) (+ (* 10 2) 12))) 
        (+ (* 10 1) 7) (+ (* 10 1) 2)
        i))
raises an exception crop: expected <number that is between 0 than the width (-1)> as first argument, given: 0

|#
