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(module plot mzscheme
(require mred
mzlib/class
mzlib/contract)
(define-struct data-set (points connected? pen min-x max-x min-y max-y))
(define-struct plot-setup (axis-label-font axis-number-font axis-pen grid? grid-pen
x-axis-marking y-axis-marking x-axis-label y-axis-label))
(provide/contract
(struct data-set ((points (listof (is-a?/c point%)))
(connected? any/c)
(pen (is-a?/c pen%))
(min-x number?)
(max-x number?)
(min-y number?)
(max-y number?)))
(struct plot-setup ((axis-label-font (is-a?/c font%))
(axis-number-font (is-a?/c font%))
(axis-pen (is-a?/c pen%))
(grid? any/c)
(grid-pen (is-a?/c pen%))
(x-axis-marking (listof number?))
(y-axis-marking (listof number?))
(x-axis-label string?)
(y-axis-label string?)))
(plot ((is-a?/c dc<%>) (listof data-set?) plot-setup? . -> . void?)))
(define (draw-text-sideways dc text x y font big-chars? offset)
(let-values (((width height bot-dist top-dist)
(send (make-object bitmap-dc% (make-object bitmap% 1 1 #f))
get-text-extent text font big-chars? offset)))
(let* ((width (inexact->exact (ceiling width)))
(height (inexact->exact (ceiling (+ height bot-dist top-dist))))
(bc (make-object bitmap-dc% (make-object bitmap% width height #f)))
(new-bc (make-object bitmap-dc% (make-object bitmap% height width #f)))
(c (make-object color%)))
(send bc set-font font)
(send bc clear)
(send new-bc clear)
(send bc draw-text text 0 0 big-chars? offset)
(let loop ((i 0)
(j 0))
(cond
((>= i (+ height top-dist bot-dist))
(send dc draw-bitmap (send new-bc get-bitmap) x y))
((>= j width) (loop (add1 i) 0))
(else
(send bc get-pixel j i c)
(send new-bc set-pixel i (- width j) c)
(loop i (add1 j))))))))
#cs
(define (plot dc data-sets ps)
(let-values (((canvas-width canvas-height) (send dc get-size))
((_ label-height label-bottom-dist label-top-dist)
(send dc get-text-extent "" (plot-setup-axis-label-font ps) #f 0))
((number-width number-height number-bottom-dist number-top-dist)
(send dc get-text-extent "00.00e-10" (plot-setup-axis-number-font ps) #f 0)))
(let* ((label-height (+ label-height label-bottom-dist label-top-dist))
(number-height (+ number-height number-bottom-dist number-top-dist))
(bottom-space (+ (* 1.5 number-height) label-height))
(side-space (+ number-width (* .5 number-height) label-height)))
(cond
((not (null? data-sets))
(let* ((mx (apply min (map data-set-min-x data-sets)))
(my (apply min (map data-set-min-y data-sets)))
(Mx (apply max (map data-set-max-x data-sets)))
(My (apply max (map data-set-max-y data-sets)))
(w-scale (/ (- canvas-width side-space) (- Mx mx)))
(h-scale (/ (- canvas-height bottom-space) (- my My)))
(transform-point
(lambda (p)
(make-object point%
(+ side-space (* (- (send p get-x) mx) w-scale))
(* (- (send p get-y) My) h-scale)))))
;; Draw axes
(send dc set-pen (plot-setup-axis-pen ps))
(send dc draw-lines
(map transform-point
(list (make-object point% mx my)
(make-object point% Mx my))))
(send dc draw-lines
(map transform-point
(list (make-object point% mx my)
(make-object point% mx My))))
;; draw axis markings
(send dc set-font (plot-setup-axis-number-font ps))
(for-each
(lambda (x)
(let* ((p (transform-point (make-object point% x my)))
(draw-x (send p get-x))
(draw-y-start (+ (send p get-y) (* .5 number-height)))
(draw-y-stop (- (send p get-y) (* .5 number-height)))
(str (number->string x)))
(send dc draw-line draw-x draw-y-start draw-x draw-y-stop)
(let-values (((number-width x1 x2 x3)
(send dc get-text-extent
str (plot-setup-axis-number-font ps) #f 0)))
(let ((start-x (- draw-x (* .5 number-width))))
(send dc draw-text str start-x (+ 2 draw-y-start))))))
(plot-setup-x-axis-marking ps))
(for-each
(lambda (y)
(let* ((p (transform-point (make-object point% mx y)))
(draw-y (send p get-y))
(draw-x-start (- (send p get-x) (* .5 number-height)))
(draw-x-stop (+ (send p get-x) (* .5 number-height)))
(str (number->string y)))
(send dc draw-line draw-x-start draw-y draw-x-stop draw-y)
(let-values (((number-width x1 x2 x3)
(send dc get-text-extent
str (plot-setup-axis-number-font ps) #f 0)))
(let ((start-x (- draw-x-start 2 number-width))
(start-y (- draw-y (* .5 number-height))))
(send dc draw-text str start-x start-y)))))
(plot-setup-y-axis-marking ps))
;; draw axis labels
(send dc set-font (plot-setup-axis-label-font ps))
(let-values (((x-label-width x1 x2 x3)
(send dc get-text-extent
(plot-setup-x-axis-label ps)
(plot-setup-axis-label-font ps) #f 0)))
(send dc draw-text
(plot-setup-x-axis-label ps)
(- (+ side-space (* .5 (- canvas-width side-space))) (* .5 x-label-width))
(- canvas-height label-height)))
(let-values (((y-label-width y1 y2 y3)
(send dc get-text-extent
(plot-setup-y-axis-label ps)
(plot-setup-axis-label-font ps) #f 0)))
(draw-text-sideways dc (plot-setup-y-axis-label ps)
0
(- (* .5 (- canvas-height bottom-space))
(* .5 y-label-width))
(plot-setup-axis-label-font ps)
#f
0))
;; draw-grid
(cond
((plot-setup-grid? ps)
(send dc set-pen (plot-setup-grid-pen ps))
(for-each (lambda (x)
(send dc draw-lines
(map transform-point
(list (make-object point% x my)
(make-object point% x My)))))
(plot-setup-x-axis-marking ps))
(for-each (lambda (y)
(send dc draw-lines
(map transform-point
(list (make-object point% mx y)
(make-object point% Mx y)))))
(plot-setup-y-axis-marking ps))))
;; draw data
(for-each
(lambda (data)
(send dc set-pen (data-set-pen data))
(cond
((data-set-connected? data)
(send dc draw-lines (map transform-point (data-set-points data))))
(else
(for-each
(lambda (p)
(let ((tp (transform-point p)))
(send dc draw-point (send tp get-x) (send tp get-y))))
(data-set-points data)))))
data-sets)))))))
)
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