(require (lib "class100.ss"))

(define sys-path 
  (lambda (f)
    (build-path (collection-path "icons") f)))

(define local-path 
  (let ([d (current-load-relative-directory)])
    (lambda (f)
      (build-path d f))))

(define (get-icon)
  (make-object bitmap% (sys-path "mred.xbm") 'xbm))

(define get-plt
  (let ([i #f])
    (lambda ()
      (unless i
	(set! i (make-object bitmap% (sys-path "plt.gif"))))
      i)))

(define get-rotated
  (let ([i #f])
    (lambda ()
      (unless i
	(set! i (let* ([icon (get-icon)]
                       [w (send icon get-width)]
                       [h (send icon get-height)])
                  (let ([bm (make-object bitmap% w h #t)])
                    (let ([src (make-object bitmap-dc% icon)]
                          [dest (make-object bitmap-dc% bm)]
                          [c (make-object color%)])
                      (let loop ([i 0])
                        (unless (= i w)
                          (let loop ([j 0])
                            (unless (= j h)
                              (send src get-pixel i j c)
                              (send dest set-pixel i (- h j 1) c)
                              (loop (add1 j))))
                          (loop (add1 i))))
                      (send src set-bitmap #f)
                      (send dest set-bitmap #f)
                      bm)))))
      i)))

(define (show-instructions file)
  (letrec ([f (make-object frame% file #f 400 400)]
	   [print (make-object button% "Print" f
			       (lambda (b ev)
				 (send e print)))]
	   [c (make-object editor-canvas% f)]
	   [e (make-object text%)])
    (send e load-file file)
    (send e lock #t)
    (send c set-editor e)
    (send f show #t)))

(define pi (atan 0 -1))

(define octagon
  (list (make-object point% 60 60)
	(make-object point% 120 60)
	(make-object point% 180 120)
	(make-object point% 180 180)
	(make-object point% 120 240)
	(make-object point% 60 240)
	(make-object point% 0 180)
	(make-object point% 0 120)
	(make-object point% 60 60)))

(define (get-b&w-light-stipple)
  (make-object bitmap%
	       (list->string (map integer->char '(#x88 0 #x22 0 #x88 0 #x22 0)))
	       8 8))

(define (get-b&w-half-stipple)
  (make-object bitmap%
	       (list->string (map integer->char '(#xcc #x33 #xcc #x33 #xcc #x33 #xcc #x33)))
	       8 8))

(let* ([f (make-object frame% "Graphics Test" #f 300 450)]
       [vp (make-object vertical-panel% f)]
       [hp0 (make-object horizontal-panel% vp)]
       [hp (make-object horizontal-panel% vp)]
       [hp2 hp]
       [hp3 (make-object horizontal-pane% vp)]
       [bb (make-object bitmap% (sys-path "bb.gif") 'gif)]
       [return (let* ([bm (make-object bitmap% (sys-path "return.xbm") 'xbm)]
		      [dc (make-object bitmap-dc% bm)])
		 (send dc draw-line 0 3 20 3)
		 (send dc set-bitmap #f)
		 bm)]
       [clock-start #f]
       [clock-end #f]
       [clock-clip? #f]
       [use-bitmap? #f]
       [use-bad? #f]
       [depth-one? #f]
       [cyan? #f]
       [save-filename #f]
       [save-file-format #f]
       [clip 'none])
  (send hp0 stretchable-height #f)
  (send hp stretchable-height #f)
  (send hp3 stretchable-height #f)
  (make-object button% "What Should I See?" hp0
	       (lambda (b e)
		 (show-instructions (local-path "draw-info.txt"))))
  (let ([canvas
	 (make-object
	  (class100 canvas% args
	    (inherit get-dc)
	    (private-field
	     [no-bitmaps? #f]
	     [no-stipples? #f]
	     [pixel-copy? #f]
	     [mask-ex-mode 'mred]
	     [scale 1]
	     [offset 0])
	    (public
	     [set-bitmaps (lambda (on?) (set! no-bitmaps? (not on?)) (on-paint))]
	     [set-stipples (lambda (on?) (set! no-stipples? (not on?)) (on-paint))]
	     [set-pixel-copy (lambda (on?) (set! pixel-copy? on?) (on-paint))]
	     [set-mask-ex-mode (lambda (mode) (set! mask-ex-mode mode) (on-paint))]
	     [set-scale (lambda (s) (set! scale s) (on-paint))]
	     [set-offset (lambda (o) (set! offset o) (on-paint))])
	    (override
	     [on-paint
	      (case-lambda
	       [() (on-paint #f)]
	       [(ps?)
		(let* ([can-dc (get-dc)]
		       [pen0s (make-object pen% "BLACK" 0 'solid)]
		       [pen1s (make-object pen% "BLACK" 1 'solid)]
		       [pen2s (make-object pen% "BLACK" 2 'solid)]
		       [pen0t (make-object pen% "BLACK" 0 'transparent)]
		       [pen1t (make-object pen% "BLACK" 1 'transparent)]
		       [pen2t (make-object pen% "BLACK" 2 'transparent)]
		       [pen0x (make-object pen% "BLACK" 0 'xor)]
		       [pen1x (make-object pen% "BLACK" 1 'xor)]
		       [pen2x (make-object pen% "BLACK" 2 'xor)]
		       [brushs (make-object brush% "BLACK" 'solid)]
		       [brusht (make-object brush% "BLACK" 'transparent)]
		       [brushb (make-object brush% "BLUE" 'solid)]
		       [mem-dc (if use-bitmap?
				   (make-object bitmap-dc%)
				   #f)]
		       [bm (if use-bitmap?
			       (if use-bad?
				   (make-object bitmap% "no such file")
				   (make-object bitmap% (* scale 400) (* scale 350) depth-one?))
			       #f)]
		       [draw-series
			(lambda (dc pens pent penx size x y flevel last?)
			  (let* ([ofont (send dc get-font)]
				 [otfg (send dc get-text-foreground)]
				 [otbg (send dc get-text-background)]
				 [obm (send dc get-text-mode)])
			    (if (positive? flevel)
				(send dc set-font
				      (make-object font%
						   10 'decorative
						   'normal 
						   (if (> flevel 1)
						       'bold
						       'normal)
						   #t)))
			    (send dc set-pen pens)
			    (send dc set-brush brusht)
			    
			    ; Text should overlay this line (except for 2x2)
			    (send dc draw-line 
				  (+ x 3) (+ y 12)
				  (+ x 40) (+ y 12))

			    (send dc set-text-background (make-object color% "YELLOW"))
			    (when (= flevel 2)
			      (send dc set-text-foreground (make-object color% "RED"))
			      (send dc set-text-mode 'solid))

			    (send dc draw-text (string-append size " P\351n") ; 351 is e with '
				  (+ x 5) (+ y 8))
			    (send dc set-font ofont)
			    
			    (when (= flevel 2)
			      (send dc set-text-foreground otfg)
			      (send dc set-text-mode obm))
			    (send dc set-text-background otbg)
			    
			    (send dc draw-line
				  (+ x 5) (+ y 27) (+ x 10) (+ 27 y))
			    (send dc draw-rectangle
				  (+ x 5) (+ y 30) 5 5)
			    (send dc draw-line
				  (+ x 12) (+ y 30) (+ x 12) (+ y 35))
			    
			    (send dc draw-line
				  (+ x 5) (+ y 40) (+ x 10) (+ 40 y))
			    (send dc draw-rectangle
				  (+ x 5) (+ y 41) 5 5)
			    (send dc draw-line
				  (+ x 10) (+ y 41) (+ x 10) (+ 46 y))
			    
			    (send dc draw-line
				  (+ x 15) (+ y 25) (+ x 20) (+ 25 y))
			    (send dc draw-line
				  (+ x 20) (+ y 30) (+ x 20) (+ 25 y))
			    
			    (send dc draw-line
				  (+ x 30) (+ y 25) (+ x 25) (+ 25 y))
			    (send dc draw-line
				  (+ x 25) (+ y 30) (+ x 25) (+ 25 y))
			    
			    (send dc draw-line
				  (+ x 35) (+ y 30) (+ x 40) (+ 30 y))
			    (send dc draw-line
				  (+ x 40) (+ y 25) (+ x 40) (+ 30 y))
			    
			    (send dc draw-line
				  (+ x 50) (+ y 30) (+ x 45) (+ 30 y))
			    (send dc draw-line
				  (+ x 45) (+ y 25) (+ x 45) (+ 30 y))

			    ; Check line thickness with "X"
			    (send dc draw-line
				  (+ x 20) (+ y 45) (+ x 40) (+ 39 y))
			    (send dc draw-line
				  (+ x 20) (+ y 39) (+ x 40) (+ 45 y))
			    
			    (send dc draw-rectangle
				  (+ x 5) (+ y 50) 10 10)
			    (send dc draw-rounded-rectangle
				  (+ x 5) (+ y 65) 10 10 3)
			    (send dc draw-ellipse
				  (+ x 5) (+ y 80) 10 10)
			    
			    (send dc set-brush brushs)
			    (send dc draw-rectangle
				  (+ x 17) (+ y 50) 10 10)
			    (send dc draw-rounded-rectangle
				  (+ x 17) (+ y 65) 10 10 3)
			    (send dc draw-ellipse
				  (+ x 17) (+ y 80) 10 10)
			    
			    (send dc set-pen pent)
			    (send dc draw-rectangle
				  (+ x 29) (+ y 50) 10 10)
			    (send dc draw-rounded-rectangle
				  (+ x 29) (+ y 65) 10 10 3)
			    (send dc draw-ellipse
				  (+ x 29) (+ y 80) 10 10)
			    
			    (send dc set-pen penx)
			    (send dc draw-rectangle
				  (+ x 41) (+ y 50) 10 10)
			    (send dc draw-rounded-rectangle
				  (+ x 41) (+ y 65) 10 10 3)
			    (send dc draw-ellipse
				  (+ x 41) (+ y 80) 10 10)
			    
			    (send dc set-pen pens)
			    (send dc draw-rectangle
				  (+ x 17) (+ y 95) 10 10)
			    ; (send dc set-logical-function 'clear)
			    (send dc draw-rectangle
				  (+ x 18) (+ y 96) 8 8)
			    ; (send dc set-logical-function 'copy)
			    
			    (send dc draw-rectangle
				  (+ x 29) (+ y 95) 10 10)
			    ; (send dc set-logical-function 'clear)
			    (send dc set-pen pent)
			    (send dc draw-rectangle
				  (+ x 30) (+ y 96) 8 8)

			    (send dc set-pen pens)
			    (send dc draw-rectangle
				  (+ x 5) (+ y 95) 10 10)
			    ; (send dc set-logical-function 'xor)
			    (send dc draw-rectangle
				  (+ x 5) (+ y 95) 10 10)
			    ; (send dc set-logical-function 'copy)
			    
			    (send dc draw-line
				  (+ x 5) (+ y 110) (+ x 8) (+ y 110))
			    (send dc draw-line
				  (+ x 8) (+ y 110) (+ x 11) (+ y 113))
			    (send dc draw-line
				  (+ x 11) (+ y 113) (+ x 11) (+ y 116))
			    (send dc draw-line
				  (+ x 11) (+ y 116) (+ x 8) (+ y 119))
			    (send dc draw-line
				  (+ x 8) (+ y 119) (+ x 5) (+ y 119))
			    (send dc draw-line
				  (+ x 5) (+ y 119) (+ x 2) (+ y 116))
			    (send dc draw-line
				  (+ x 2) (+ y 116) (+ x 2) (+ y 113))
			    (send dc draw-line
				  (+ x 2) (+ y 113) (+ x 5) (+ y 110))
			    
			    (send dc draw-lines
				  (list
				   (make-object point% 5 95)
				   (make-object point% 8 95)
				   (make-object point% 11 98)
				   (make-object point% 11 101)
				   (make-object point% 8 104)
				   (make-object point% 5 104)
				   (make-object point% 2 101)
				   (make-object point% 2 98)
				   (make-object point% 5 95))
				  (+ x 12) (+ y 15))

			    (send dc draw-point (+ x 35) (+ y 115))
			    (send dc draw-line (+ x 35) (+ y 120) (+ x 35) (+ y 120))
			    
			    (send dc draw-line
				  (+ x 5) (+ y 125) (+ x 10) (+ y 125))
			    (send dc draw-line
				  (+ x 11) (+ y 125) (+ x 16) (+ y 125))

			    (send dc set-brush brusht)
			    (send dc draw-arc 
				  (+ x 5) (+ y 135)
				  30 40
				  0 (/ pi 2))
			    (send dc draw-arc 
				  (+ x 5) (+ y 135)
				  30 40
				  (/ pi 2) pi)
			    (send dc set-brush brushs)
			    (send dc draw-arc 
				  (+ x 45) (+ y 135)
				  30 40
				  (/ pi 2) pi)
			    (send dc set-brush brusht)      

			    
			    (when last?
			      (let ([p (send dc get-pen)])
				(send dc set-pen (make-object pen% "BLACK" 1 'xor))
				(send dc draw-polygon octagon)
				(send dc set-pen p))

			      (when clock-start
				(let ([b (send dc get-brush)])
				  (send dc set-brush (make-object brush% "ORANGE" 'solid))
				  (send dc draw-arc 0. 60. 180. 180. clock-start clock-end)
				  (send dc set-brush b))))

			    (when last?
			      (let ([op (send dc get-pen)])

				; Splines
				(define (draw-ess dx dy)
				  (send dc draw-spline 
					(+ dx 200) (+ dy 10)
					(+ dx 218) (+ dy 12)
					(+ dx 220) (+ dy 20))
				  (send dc draw-spline 
					(+ dx 220) (+ dy 20)
					(+ dx 222) (+ dy 28)
					(+ dx 240) (+ dy 30)))
				(send dc set-pen pen0s)
				(draw-ess 0 0)
				(send dc set-pen (make-object pen% "RED" 0 'solid))
				(draw-ess -2 2)
			      
				; Polygons: odd-even vs. winding
				(let ([polygon
				       (list (make-object point% 12 0)
					     (make-object point% 40 0)
					     (make-object point% 40 28)
					     (make-object point% 0 28)
					     (make-object point% 0 12)
					     (make-object point% 28 12)
					     (make-object point% 28 40)
					     (make-object point% 12 40)
					     (make-object point% 12 0))]
				      [ob (send dc get-brush)]
				      [op (send dc get-pen)])
				  (send dc set-pen pen1s)
				  (send dc set-brush (make-object brush% "BLUE" 'solid))
				  (send dc draw-polygon polygon 200 40 'odd-even)
				  (send dc draw-polygon polygon 200 90 'winding)
				  (send dc set-pen op)
				  (send dc set-brush ob))


				; Brush patterns:
				(let ([pat-list (list 'bdiagonal-hatch
						      'crossdiag-hatch
						      'fdiagonal-hatch
						      'cross-hatch
						      'horizontal-hatch
						      'vertical-hatch)]
				      [b (make-object brush% "BLACK" 'solid)]
				      [ob (send dc get-brush)]
				      [obg (send dc get-background)]
				      [blue (make-object color% "BLUE")])
				  (let loop ([x 245][y 10][l pat-list])
				    (unless (null? l)
				      (send b set-color "BLACK")
				      (send b set-style (car l))
				      (send dc set-brush b)
				      (send dc draw-rectangle x y 20 20)
				      (send dc set-brush ob)
				      (send b set-color "GREEN")
				      (send dc set-brush b)
				      (send dc draw-rectangle (+ x 25) y 20 20)
				      (send dc set-background blue)
				      (send dc draw-rectangle (+ x 50) y 20 20)
				      (send dc set-background obg)
				      (send dc set-brush ob)
				      (loop x (+ y 25) (cdr l))))

				  (send b set-style 'panel)
				  (send b set-color (get-panel-background))
				  (send dc set-brush b)
				  (send dc draw-rectangle 320 10 20 20)
				  (send dc draw-ellipse 320 35 20 20)
				  (send dc draw-arc 320 60 20 20 0 3.14)
				  (send dc draw-rounded-rectangle 320 85 20 20 2)

				  (send dc set-brush ob))
				
				(send dc set-pen op))

			      ; Thick-line centering:
			      (let ([thick (make-object pen% "GREEN" 5 'solid)])
				(define (draw-lines)
				  (send dc draw-line 360 10 400 50)
				  (send dc draw-line 360 50 400 10)
				  (send dc draw-line 360 80 400 80)
				  (send dc draw-line 380 60 380 100)
				  (send dc draw-line 360 120 400 140)
				  (send dc draw-line 370 110 390 150))
				(let ([op (send dc get-pen)])
				  (send dc set-pen thick)
				  (draw-lines)
				  (send dc set-pen pen0s)
				  (draw-lines)
				  (send dc set-pen op)))
				
			      ; B&W 8x8 stipple:
			      (unless no-bitmaps?
				(let ([bml (get-b&w-light-stipple)]
				      [bmh (get-b&w-half-stipple)]
				      [orig-b (send dc get-brush)]
				      [orig-pen (send dc get-pen)])
				  (send dc set-brush brusht)
				  (send dc set-pen pen1s)
				  (send dc draw-rectangle 244 164 18 18)
				  (send dc draw-bitmap bml 245 165)
				  (send dc draw-bitmap bml 245 173)
				  (send dc draw-bitmap bml 253 165)
				  (send dc draw-bitmap bml 253 173)

				  (let ([p (make-object pen% "RED" 1 'solid)])
				    (send p set-stipple bmh)
				    (send dc set-pen p)
				    (send dc draw-rectangle 270 164 18 18))

				  (send dc set-brush orig-b)
				  (send dc set-pen orig-pen))))
			    
			    (unless no-bitmaps?
			      (let ([obg (send dc get-background)]
				    [tan (make-object color% "TAN")])
				(send dc set-background tan)
				(let* ([bits "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789/+"]
				       [bm (make-object bitmap% bits 64 8)])
				  (send dc draw-bitmap bm 306 164 'opaque))
				(let* ([bits "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567"]
				       [bm (make-object bitmap% bits 48 10)])
				  (send dc draw-bitmap bm 306 184 'opaque))
				(send dc set-background obg)))

			    (when last?
			      ; Test get-text-extent
			      (let ([save-pen (send dc get-pen)]
				    [save-fnt (send dc get-font)])
				(send dc set-pen (make-object pen% "YELLOW" 1 'solid))
				(let loop ([fam '(default default modern modern decorative roman)]
					   [stl '(normal  slant   slant  italic normal     normal)]
					   [wgt '(normal  bold    normal normal bold       normal)]
					   [sze '(12      12      12     12     12         32)]
					   [x 244]
					   [y 210])
				  (unless (null? fam)
				    (let ([fnt (make-object font% (car sze) (car fam) (car stl) (car wgt))]
					  [s "AgMh"])
				      (send dc set-font fnt)
				      (send dc draw-text s x y)
				      (send dc set-font save-fnt)
				      (let-values ([(w h d a) (send dc get-text-extent s fnt)])
					(send dc draw-rectangle x y w h)
					(send dc draw-line x (+ y (- h d)) (+ x w) (+ y (- h d)))
					(loop (cdr fam) (cdr stl) (cdr wgt) (cdr sze) x (+ y h))))))
				(send dc set-pen save-pen)))

			    ; Bitmap copying:
			    (when (and (not no-bitmaps?) last?)
			      (let ([x 5] [y 165])
				(let ([mred-icon (get-icon)])
				  (case mask-ex-mode
				    [(plt plt-mask plt^plt)
				     (let* ([plt (get-plt)]
					    [tmp-bm (make-object bitmap% 
								 (send mred-icon get-width)
								 (send mred-icon get-height)
								 #f)]
					    [tmp-dc (make-object bitmap-dc% tmp-bm)])
				       (send tmp-dc draw-bitmap plt 
					     (/ (- (send mred-icon get-width)
						   (send plt get-width))
						2)
					     (/ (- (send mred-icon get-height)
						   (send plt get-height))
						2))
				       (send dc draw-bitmap tmp-bm x y 'solid 
					     (send the-color-database find-color "BLACK")
					     (cond
					      [(eq? mask-ex-mode 'plt-mask) mred-icon]
					      [(eq? mask-ex-mode 'plt^plt) tmp-bm]
					      [else #f])))]
                                    [(mred^mred)
                                     (send dc draw-bitmap mred-icon x y
                                           'solid
                                           (send the-color-database find-color "BLACK")
                                           mred-icon)]
                                    [(mred~)
                                     (send dc draw-bitmap (get-rotated) x y 'opaque)]
                                    [(mred^mred~ opaque-mred^mred~ red-mred^mred~)
                                     (send dc draw-bitmap mred-icon x y 
                                           (if (eq? mask-ex-mode 'opaque-mred^mred~)
                                               'opaque
                                               'solid)
                                           (send the-color-database find-color 
                                                 (if (eq? mask-ex-mode 'red-mred^mred~)
                                                     "RED"
                                                     "BLACK"))
                                           (get-rotated))]
                                    [else
                                     ;; simple draw
                                     (send dc draw-bitmap mred-icon x y 'xor)]))
				(set! x (+ x (send (get-icon) get-width)))
				(let ([black (send the-color-database find-color "BLACK")]
				      [red (send the-color-database find-color "RED")]
				      [do-one
				       (lambda (bm mode color)
					 (if (send bm ok?)
					     (begin
					       (let ([h (send bm get-height)]
						     [w (send bm get-width)])
						 (send dc set-pen (make-object pen% "YELLOW" 1 'solid))
						 (send dc draw-line 3 3 40 40)
						 (send dc draw-bitmap-section
						       bm x y 
						       0 0 w h
						       mode color)
						 (set! x (+ x w 10))))
					     (printf "bad bitmap~n")))])
				  ;; BB icon
				  (do-one bb 'solid black)
				  (let ([start x])
				    ;; First three return icons:
				    (do-one return 'solid black)
				    (do-one return 'solid red)
				    (do-one return 'opaque red)
				    ;; Next three, on a bluew background
				    (let ([end x]
					  [b (send dc get-brush)])
				      (send dc set-brush (make-object brush% "BLUE" 'solid))
				      (send dc draw-rounded-rectangle (- start 5) (+ y 15) (- end start) 15 -0.2)
				      (send dc set-brush b)
				      (set! x start)
				      (set! y (+ y 18))
				      (do-one return 'solid black)
				      (do-one return 'solid red)
				      (do-one return 'opaque red)
				      (set! y (- y 18))))
				  ;; Another BB icon, make sure color has no effect
				  (do-one bb 'solid red)
				  ;; Another return, blacnk on red
				  (let ([bg (send dc get-background)])
				    (send dc set-background (send the-color-database find-color "BLACK"))
				    (do-one return 'opaque red)
				    (send dc set-background bg))
				  ;; Return by drawing into color, copying color to monochrome, then
				  ;;  monochrome back oonto canvas:
				  (let* ([w (send return get-width)]
					 [h (send return get-height)]
					 [color (make-object bitmap% w h)]
					 [mono (make-object bitmap% w h #t)]
					 [cdc (make-object bitmap-dc% color)]
					 [mdc (make-object bitmap-dc% mono)])
				    (send cdc clear)
				    (send cdc draw-bitmap return 0 0)
				    (send mdc clear)
				    (send mdc draw-bitmap color 0 0)
				    (send dc draw-bitmap mono
					  (- x w 10) (+ y 18)))
				  (send dc set-pen pens))))

			    (when (and (not no-stipples?) last?)
			      ; Blue box as background:
			      (send dc set-brush brushb)
			      (send dc draw-rectangle 80 200 125 40)
			      (when (send return ok?)
				(let ([b (make-object brush% "GREEN" 'solid)])
				  (send b set-stipple return)
				  (send dc set-brush b)
				  ; First stipple (transparent background)
				  (send dc draw-rectangle 85 205 30 30)
				  (send dc set-brush brushs)
				  (send b set-style 'opaque)
				  (send dc set-brush b)
				  ; Second stipple (opaque)
				  (send dc draw-ellipse 120 205 30 30)
				  (send dc set-brush brushs)
				  (send b set-stipple bb)
				  (send dc set-brush b)
				  ; Third stipple (BB logo)
				  (send dc draw-rectangle 155 205 20 30)
				  (send dc set-brush brushs)
				  (send b set-stipple #f)
				  (send b set-style 'cross-hatch)
				  (send dc set-brush b)
				  ; Green cross hatch (white BG) on blue field
				  (send dc draw-rectangle 180 205 20 20)
				  (send dc set-brush brushs))))
			    
			    (when (and pixel-copy? last? (not (or ps? (eq? dc can-dc))))
			      (let* ([x 100]
				     [y 170]
				     [x2 245] [y2 188]
				     [w 40] [h 20]
				     [c (make-object color%)]
				     [bm (make-object bitmap% w h depth-one?)]
				     [mdc (make-object bitmap-dc%)])
				(send mdc set-bitmap bm)
				(let iloop ([i 0])
				  (unless (= i w)
				    (let jloop ([j 0])
				      (if (= j h)
					  (iloop (add1 i))
					  (begin
					    (send dc get-pixel (+ i x) (+ j y) c)
					    (send mdc set-pixel i j c)
					    (jloop (add1 j)))))))
				(send dc draw-bitmap bm x2 y2)
				(let ([p (send dc get-pen)]
				      [b (send dc get-brush)])
				  (send dc set-pen (make-object pen% "BLACK" 0 'xor-dot))
				  (send dc set-brush brusht)
				  (send dc draw-rectangle x y w h)
				  (send dc set-pen p)
				  (send dc set-brush b))))
			    
			    (let ([styles (list 'solid
						'dot
						'long-dash
						'short-dash
						'dot-dash)]
				  [obg (send dc get-background)]
				  [red (make-object color% "RED")])
			      (let loop ([s styles][y 250])
				(unless (null? s)
				  (let ([p (make-object pen% "GREEN" flevel (car s))])
				    (send dc set-pen p)
				    (send dc draw-line (+ x 5) y (+ x 30) y)
				    (send dc set-background red)
				    (send dc draw-line (+ x 5) (+ 4 y) (+ x 30) (+ y 4))
				    (send dc set-background obg)
				    (send pens set-style (car s))
				    (send dc set-pen pens)
				    (send dc draw-line (+ x 30) y (+ x 55) y)
				    (send dc set-background red)
				    (send dc draw-line (+ x 30) (+ y 4) (+ x 55) (+ y 4))
				    (send dc set-background obg)
				    (send dc set-pen pent)
				    (send pens set-style 'solid)
				    (loop (cdr s) (+ y 8))))))

			    (when (= flevel 2)
			      (let ([lens '(0 0.25 0.5 0.75 1.0 1.25 1.5 1.75 2.0)])
				(let loop ([l lens][x 10])
				  (unless (null? l)
				    (let ([p (make-object pen% "BLACK" (car l) 'solid)])
				      (send dc set-pen p)
				      (send dc draw-line x 300 (+ x 19) 300)
				      (send dc set-pen pent)
				      (loop (cdr l) (+ x 20)))))))

			    (when (and last? (not (or ps? (eq? dc can-dc)))
				       (send mem-dc get-bitmap))
			      (send can-dc draw-bitmap (send mem-dc get-bitmap) 0 0 'opaque)))
			  
			  'done)])

		  (send (get-dc) set-scale 1 1)
		  (send (get-dc) set-origin 0 0)

		  (let ([dc (if ps?
				(let ([dc (if (eq? ps? 'print)
					      (make-object printer-dc%)
					      (make-object post-script-dc%))])
				  (and (send dc ok?) dc))
				(if (and use-bitmap?)
				    (begin
				      (send mem-dc set-bitmap bm)
				      mem-dc)
				    (get-dc)))])
		    (when dc
		      (send dc start-doc "Draw Test")
		      (send dc start-page)

		      (send dc set-scale scale scale)
		      (send dc set-origin offset offset)
		      
		      (send dc set-background
			    (if cyan?
				(send the-color-database find-color "CYAN")
				(send the-color-database find-color "WHITE")))

		      ;(send dc set-clipping-region #f)
		      (send dc clear)

		      (if clock-clip?
			  (let ([r (make-object  region% dc)])
			    (send r set-arc 0. 60. 180. 180. clock-start clock-end)
			       (send dc set-clipping-region r))
			  (let ([mk-poly (lambda ()
					   (let ([r (make-object region% dc)])
					     (send r set-polygon octagon) r))]
				[mk-circle (lambda ()
					     (let ([r (make-object region% dc)])
					       (send r set-ellipse 0. 60. 180. 180.) r))]
				[mk-rect (lambda ()
					   (let ([r (make-object region% dc)])
					     (send r set-rectangle 100 -25 10 400) r))])
			    (case clip
			      [(none) (void)]
			      [(rect) (send dc set-clipping-rect 100 -25 10 400)]
			      [(rect2) (send dc set-clipping-rect 50 -25 10 400)]
			      [(poly) (send dc set-clipping-region (mk-poly))]
			      [(circle) (send dc set-clipping-region (mk-circle))]
			      [(rect+poly) (let ([r (mk-poly)])
					     (send r union (mk-rect))
						(send dc set-clipping-region r))]
			      [(rect+circle) (let ([r (mk-circle)])
					       (send r union (mk-rect))
						  (send dc set-clipping-region r))]
			      [(poly-rect) (let ([r (mk-poly)])
					     (send r subtract (mk-rect))
						(send dc set-clipping-region r))]
			      [(poly&rect) (let ([r (mk-poly)])
					     (send r intersect (mk-rect))
						(send dc set-clipping-region r))]
			      [(roundrect) (let ([r (make-object region% dc)])
					     (send r set-rounded-rectangle 80 200 125 40 -0.25)
					     (send dc set-clipping-region r))]
			      [(polka) 
			       (let ([c (send dc get-background)])
				 (send dc set-background (send the-color-database find-color "PURPLE"))
				 (send dc clear)
				 (send dc set-background c))
			       (let ([r (make-object region% dc)]
				     [w 30]
				     [s 10])
				 (let xloop ([x 0])
				   (if (> x 300)
				       (send dc set-clipping-region r)
				       (let yloop ([y 0])
					 (if (> y 500)
					     (xloop (+ x w s))
					     (let ([r2 (make-object region% dc)])
					       (send r2 set-ellipse x y w w)
					       (send r union r2)
					       (yloop (+ y w s))))))))
			       (send dc clear)])))
		      
		      ; check default pen/brush:
		      (send dc draw-rectangle 0 0 5 5)
		      (send dc draw-line 0 0 20 6)
		      
		      (draw-series dc pen0s pen0t pen0x "0 x 0" 5 0 0 #f)
		      
		      (draw-series dc pen1s pen1t pen1x "1 x 1" 70 0 1 #f)
		      
		      (draw-series dc pen2s pen2t pen2x "2 x 2" 135 0 2 #t)

		      (unless clock-clip?
			(let ([r (send dc get-clipping-region)])
			  (if (eq? clip 'none)
			      (when r
				(error 'draw-test "shouldn't have been a clipping region"))
			      (let*-values ([(x y w h) (send r get-bounding-box)]
					    [(l) (list x y w h)])
				(unless (andmap = l
						(case clip
						  [(rect) '(100. -25. 10. 400.)]
						  [(rect2) '(50. -25. 10. 400.)]
						  [(poly circle poly-rect) '(0. 60. 180. 180.)]
						  [(rect+poly rect+circle) '(0. -25. 180. 400.)]
						  [(poly&rect) '(100. 60. 10. 180.)]
						  [(roundrect) '(80. 200. 125. 40.)]
						  [(polka) '(0. 0. 310. 510.)]))
				  (error 'draw-test "clipping region changed badly: ~a" l))))))

		      (let-values ([(w h) (send dc get-size)])
			(unless (cond
				 [ps? #t]
				 [use-bad? #t]
				 [use-bitmap? (and (= w (* scale 400)) (= h (* scale 350)))]
				 [else (= w (send this get-width)) (= h (send this get-height))])
			  (error 'x "wrong size reported by get-size: ~a ~a; w & h is ~a ~a" 
				 w h (send this get-width) (send this get-height))))

		      (send dc set-clipping-region #f)

		      (send dc end-page)
		      (send dc end-doc)))
		  
		  (when save-filename
		    (send bm save-file save-filename save-file-format)
		    (set! save-filename #f))

		  'done)])])
	    (sequence (apply super-init args)))
	  vp)])
    (make-object radio-box% #f '("Canvas" "Pixmap" "Bitmap" "Bad") hp0
		 (lambda (self event)
		   (set! use-bitmap? (< 0 (send self get-selection)))
		   (set! depth-one? (< 1 (send self get-selection)))
		   (set! use-bad? (< 2 (send self get-selection)))
		   (send canvas on-paint))
		 '(horizontal))
    (make-object button% "Save" hp0
		 (lambda (b e)
		   (unless use-bitmap?
		     (error 'save-file "only available for pixmap/bitmap mode"))
		   (let ([f (put-file)])
		     (when f
		       (let ([format
			      (cond 
			       [(regexp-match "[.]xbm$" f) 'xbm]
			       [(regexp-match "[.]xpm$" f) 'xpm]
			       [(regexp-match "[.]jpe?g$" f) 'jpeg]
			       [(regexp-match "[.]png$" f) 'png]
			       [else (error 'save-file "unknown suffix: ~e" f)])])
			 (set! save-filename f)
			 (set! save-file-format format)
			 (send canvas on-paint))))))
    (make-object button% "PS" hp
		 (lambda (self event)
		   (send canvas on-paint #t)))
    (make-object button% "Print" hp
		 (lambda (self event)
		   (send canvas on-paint 'print)))
    (make-object choice% #f '("1" "*2" "/2") hp
		 (lambda (self event)
		   (send canvas set-scale (list-ref '(1 2 1/2) (send self get-selection)))))
    (make-object check-box% "+10" hp
		 (lambda (self event)
		   (send canvas set-offset (if (send self get-value) 10 0))))
    (make-object check-box% "Cyan" hp
		 (lambda (self event)
		   (set! cyan? (send self get-value))
		   (send canvas on-paint)))
    (send (make-object check-box% "Icons" hp2
		       (lambda (self event)
			 (send canvas set-bitmaps (send self get-value))))
	  set-value #t)
    (send (make-object check-box% "Stipples" hp2
		       (lambda (self event)
			 (send canvas set-stipples (send self get-value))))
	  set-value #t)
    (make-object check-box% "Pixset" hp2
		 (lambda (self event)
		   (send canvas set-pixel-copy (send self get-value))))
    (make-object choice% "Clip" 
		 '("None" "Rectangle" "Rectangle2" "Octagon" "Circle" "Round Rectangle"
		   "Rectangle + Octagon" "Rectangle + Circle" 
		   "Octagon - Rectangle" "Rectangle & Octagon" "Polka")
		 hp3
		 (lambda (self event)
		   (set! clip (list-ref
		               '(none rect rect2 poly circle roundrect rect+poly rect+circle poly-rect poly&rect polka)
		               (send self get-selection)))
		   (send canvas on-paint)))
    (let ([clock (lambda (clip?)
		   (thread (lambda ()
			     (set! clock-clip? clip?)
			     (let loop ([c 0][swapped? #f][start 0.][end 0.])
			       (if (= c 32)
				   (if swapped?
				       (void)
				       (loop 0 #t 0. 0.))
				   (begin
				     (set! clock-start (if swapped? end start))
				     (set! clock-end (if swapped? start end))
				     (send canvas on-paint)
				     (sleep 0.25)
				     (loop (add1 c) swapped? (+ start (/ pi 8)) (+ end (/ pi 16))))))
			     (set! clock-clip? #f)
			     (set! clock-start #f)
			     (set! clock-end #f)
			     (send canvas on-paint))))])
      (make-object button% "Clock" hp3 (lambda (b e) (clock #f)))
      (make-object button% "Clip Clock" hp3 (lambda (b e) (clock #t)))
      (make-object choice% #f
                   '("MrEd XOR" "PLT Middle" "PLT ^ MrEd" "MrEd ^ MrEd" 
                     "MrEd~" "MrEd ^ MrEd~" "M^M~ Opaque" "M^M~ Red"
		     "PLT^PLT")
                   hp3
		   (lambda (self event)
		     (send canvas set-mask-ex-mode 
                           (list-ref '(mred plt plt-mask mred^mred 
                                            mred~ mred^mred~ opaque-mred^mred~ red-mred^mred~
					    plt^plt)
                                     (send self get-selection)))))))

  (send f show #t))

; Canvas, Pixmaps, and Bitmaps:
;  get-pixel
;  begin-set-pixel
;  end-set-pixel
;  set-pixel