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;;;; "charplot.scm", plotting on character devices for Scheme
;;; Copyright (C) 1992, 1993 Aubrey Jaffer.
;
;Permission to copy this software, to redistribute it, and to use it
;for any purpose is granted, subject to the following restrictions and
;understandings.
;
;1. Any copy made of this software must include this copyright notice
;in full.
;
;2. I have made no warrantee or representation that the operation of
;this software will be error-free, and I am under no obligation to
;provide any services, by way of maintenance, update, or otherwise.
;
;3. In conjunction with products arising from the use of this
;material, there shall be no use of my name in any advertising,
;promotional, or sales literature without prior written consent in
;each case.
(require 'sort)
(define charplot:rows 24)
(define charplot:columns (output-port-width (current-output-port)))
(define charplot:xborder #\_)
(define charplot:yborder #\|)
(define charplot:xaxchar #\-)
(define charplot:yaxchar #\:)
(define charplot:curve1 #\*)
(define charplot:xtick #\.)
(define charplot:height (- charplot:rows 5))
(define charplot:width (- charplot:columns 15))
(define (charplot:printn! n char)
(cond ((positive? n)
(write-char char)
(charplot:printn! (+ n -1) char))))
(define (charplot:center-print! str width)
(let ((lpad (quotient (- width (string-length str)) 2)))
(charplot:printn! lpad #\ )
(display str)
(charplot:printn! (- width (+ (string-length str) lpad)) #\ )))
(define (scale-it z scale)
(if (and (exact? z) (integer? z))
(quotient (* z (car scale)) (cadr scale))
(inexact->exact (round (/ (* z (car scale)) (cadr scale))))))
(define (find-scale isize delta)
(if (inexact? delta) (set! isize (exact->inexact isize)))
(do ((d 1 (* d 10)))
((<= delta isize)
(do ((n 1 (* n 10)))
((>= (* delta 10) isize)
(list (* n (cond ((< (* delta 8) isize) 8)
((< (* delta 6) isize) 6)
((< (* delta 5) isize) 5)
((< (* delta 4) isize) 4)
((< (* delta 3) isize) 3)
((< (* delta 2) isize) 2)
(else 1)))
d))
(set! delta (* delta 10))))
(set! isize (* isize 10))))
(define (charplot:iplot! data xlabel ylabel xmin xscale ymin yscale)
(define xaxis (- (scale-it ymin yscale)))
(define yaxis (- (scale-it xmin xscale)))
(charplot:center-print! ylabel 11)
(charplot:printn! (+ charplot:width 1) charplot:xborder)
(newline)
(set! data (sort! data (lambda (x y) (if (= (cdr x) (cdr y))
(< (car x) (car y))
(> (cdr x) (cdr y))))))
(do ((ht (- charplot:height 1) (- ht 1)))
((negative? ht))
(let ((a (make-string (+ charplot:width 1)
(if (= ht xaxis) charplot:xaxchar #\ )))
(ystep (if (= 1 (gcd (car yscale) 3)) 2 3)))
(string-set! a charplot:width charplot:yborder)
(if (< -1 yaxis charplot:width) (string-set! a yaxis charplot:yaxchar))
(do ()
((or (null? data) (not (>= (cdar data) ht))))
(string-set! a (caar data) charplot:curve1)
(set! data (cdr data)))
(if (zero? (modulo (- ht xaxis) ystep))
(let* ((v (number->string (/ (* (- ht xaxis) (cadr yscale))
(car yscale))))
(l (string-length v)))
(if (> l 10)
(display (substring v 0 10))
(begin
(charplot:printn! (- 10 l) #\ )
(display v)))
(display charplot:yborder)
(display charplot:xaxchar))
(begin
(charplot:printn! 10 #\ )
(display charplot:yborder)
(display #\ )))
(display a) (newline)))
(let* ((xstep (if (= 1 (gcd (car xscale) 3)) 10 12))
(xstep/2 (quotient (- xstep 2) 2))
(fudge (modulo yaxis xstep)))
(charplot:printn! 10 #\ ) (display charplot:yborder)
(charplot:printn! (+ 1 fudge) charplot:xborder)
(display charplot:yaxchar)
(do ((i fudge (+ i xstep)))
((> (+ i xstep) charplot:width)
(charplot:printn! (modulo (- charplot:width (+ i 1)) xstep)
charplot:xborder))
(charplot:printn! xstep/2 charplot:xborder)
(display charplot:xtick)
(charplot:printn! xstep/2 charplot:xborder)
(display charplot:yaxchar))
(display charplot:yborder) (newline)
(charplot:center-print! xlabel (+ 12 fudge (- xstep/2)))
(do ((i fudge (+ i xstep)))
((> (+ i xstep) charplot:width))
(charplot:center-print! (number->string (/ (* (- i yaxis) (cadr xscale))
(car xscale)))
xstep))
(newline)))
(define (charplot:plot! data xlabel ylabel)
(let* ((xmax (apply max (map car data)))
(xmin (apply min (map car data)))
(xscale (find-scale charplot:width (- xmax xmin)))
(ymax (apply max (map cdr data)))
(ymin (apply min (map cdr data)))
(yscale (find-scale charplot:height (- ymax ymin)))
(ixmin (scale-it xmin xscale))
(iymin (scale-it ymin yscale)))
(charplot:iplot! (map (lambda (p)
(cons (- (scale-it (car p) xscale) ixmin)
(- (scale-it (cdr p) yscale) iymin)))
data)
xlabel ylabel xmin xscale ymin yscale)))
(define plot! charplot:plot!)
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