;;;; slib-charplot-test.scm
;;;; Kon Lovett, Mar '20

(import test)

(test-begin "Charplot (SLIB)")

;;;

(import slib-charplot)

(import (chicken base))
(import (chicken type))
(import (srfi 63))

;;

#; ;Pass - Argument #1 to procedure `plot' has an invalid type:...
(plot "FAILS" "" "")

;NOTE must be proper list 4 `list->array', otherwise cons ok
(define (make-point n) (let ((i (/ n 6))) `(,i ,(sin i))))

#; ;test dep
(define (unfold/count f n)
  (import (srfi 1))
  (unfold-right zero? f sub1 n) )

#; ;test dep
(define (make-points n) (unfold/count make-point n))

(define (make-points n)
  (if (zero? n) '()
      (cons (make-point n) (make-points (sub1 n)))) )

(print)
(print "*** Plot w/ dimensions 4x5+2 (minimum safe @ minimum left-margin)")
(print)

;Fail - infinite loop forall H, W : H < 4, W < (5 + LM)
(time
  (parameterize ((plot-left-margin #f)
                 ;5 = (string-length "Sin(x)") - 1 ; max (map string-length (hlabel vlabel))
                 (plot-dimensions `(4 ,(+ 5 (plot-left-margin)))) )
    (plot (list->array 2 '#() (make-points 40)) "x" "Sin(x)") ) )

(print)

(time
  (let ((hlabel "x") (vlabel "Sin(x)"))
    (parameterize ((plot-left-margin (+ 2 (max (string-length hlabel) (string-length vlabel))))
                   (plot-dimensions `(24 ,(+ 54 (plot-left-margin)))) )
      (plot (list->array 2 '#() (make-points 40)) hlabel vlabel) ) ) )

;;;"Tests" (examples) from http://people.csail.mit.edu/jaffer/slib_5.html#SEC125

;;

(print)
(print "*** Plot w/ dimensions 20x55")
(print)

;ex 1
(time
  (parameterize ((plot-dimensions '(20 55)))
    (plot (make-points 40) "x" "Sin(x)") ) )

;checkout the, undocumented, histogram? switch
(print)
(print "*** Histogram w/ dimensions 20x55 (NOTE undocumented by SLIB site)")
(print)

(time
  (parameterize ((plot-dimensions '(20 55)))
    (plot (make-points 40) "x" "Sin(x)" #t) ) )

;default labels
(print)
(print "*** Plot w/ default labels")
(print)

(time
  (parameterize ((plot-left-margin #f)
                 (plot-dimensions '(20 55)) )
    (plot (make-points 40)) ) )

;;

;mathh
(define-constant PI         3.1415926535897932384626433832795028841972)   ; pi
(define pi        PI)         ; pi

(print)
(print "*** Plot w/ dimensions <console> (#f)")
(print)

;test framing
;ex 2
(time
  (parameterize ((plot-dimensions #f))
    (plot sin 0 (* 2 pi)) ) )

(print)
(print "*** Plot w/ default range")
(print)

(time
  (parameterize ((plot-left-margin #f)
                 (plot-dimensions '(20 55)) )
    (plot sin) ) )

;;

;srfi-27
(define-type random-f64-function  (-> float))
;fortran "real"
(define-type random-real-function random-f64-function)

;; Knuth's "The Art of Computer Programming", Vol. II, 2nd ed.,
;; Algorithm P of Section 3.4.1.C.
;
;silly experiment
(: *make-random-normals (number number random-real-function --> random-real-function))
;
(define (*make-random-normals mu sigma randoms)
  (let ((next #f))
    (lambda ()
      (if next
          (let ((result next))
            (set! next #f)
            (+ mu (* sigma result)))
          (let loop ()
            (let ((v1 (- (* 2 (inexact->exact (randoms))) 1))
                  (v2 (- (* 2 (inexact->exact (randoms))) 1)) )
              (let ((s (+ (* v1 v1) (* v2 v2))))
                (if (<= 1 s)
                    (loop)
                    (let ((scale
                            (inexact->exact (sqrt (/ (* -2 (inexact->exact (log s))) s)))) )
                      (set! next (* scale v2))
                      (+ mu (* sigma scale v1)) ) ) ) ) ) ) ) ) )

(define random-normal
  (let ()
    (import (only (chicken random) pseudo-random-real))
    (*make-random-normals 0 1 pseudo-random-real)))

(define (make-normals n bias)
  (do ((n n (sub1 n))
       (ls '() (cons (* bias (random-normal)) ls)))
      ((<= n 0) ls)) )

(print)
(print "*** Histograph (Normals) w/ dimensions 20x55 & left-margin 6")
(print)

;test framing
;ex 3
(time
  (parameterize ((plot-left-margin 6)
                 (plot-dimensions '(20 55)) )
    (histograph (make-normals 99 .02) "Normals") ) )

(print)
(print "*** Histograph data labeling")
(print)

(define (plotdata-length x)
  (cond ((list? x) (values (length x) 0))
        ((vector? x) (values (vector-length x) 0))
        (else
          (case (array-rank x)
            ((1) (values (car (array-dimensions x)) 0))
            ((2) (apply values (array-dimensions x))) ) ) ) )

(define (plotdata-label x)
  (import (only (chicken format) format))
  (define format-label (cut format #f "[#~A]" <>))
  (let-values (((xlen ylen) (plotdata-length x)))
    (values (format-label xlen) (if (zero? ylen) "" (format-label ylen)))) )

(time
  (parameterize ((plot-labels plotdata-label)
                 (plot-left-margin 6)
                 (plot-dimensions '(20 55)))
    (histograph (make-normals 9 .02)) ) )

;;

(test-end "Charplot (SLIB)")

(test-exit)