From bd9733926076885e3417b74de76e4c9c7bc56254 Mon Sep 17 00:00:00 2001
From: Bryan Newbold <bnewbold@robocracy.org>
Date: Mon, 20 Feb 2017 00:05:28 -0800
Subject: Import Upstream version 2c7

---
 charplot.scm | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

(limited to 'charplot.scm')

diff --git a/charplot.scm b/charplot.scm
index 2a2a49a..2c64615 100644
--- a/charplot.scm
+++ b/charplot.scm
@@ -18,6 +18,7 @@
 ;each case.
 
 (require 'sort)
+(require 'printf)
 
 (define charplot:rows 24)
 (define charplot:columns (output-port-width (current-output-port)))
@@ -43,6 +44,9 @@
     (display str)
     (charplot:printn! (- width (+ (string-length  str) lpad)) #\ )))
 
+(define (charplot:number->string x)
+  (sprintf #f "%g" x))
+
 (define (scale-it z scale)
   (if (and (exact? z) (integer? z))
       (quotient (* z (car scale)) (cadr scale))
@@ -86,8 +90,8 @@
 	(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))))
+	  (let* ((v (charplot:number->string (/ (* (- ht xaxis) (cadr yscale))
+						(car yscale))))
 		 (l (string-length v)))
 	    (if (> l 10)
 		(display (substring v 0 10))
@@ -119,12 +123,16 @@
     (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)))
+      (charplot:center-print! (charplot:number->string
+			       (/ (* (- i yaxis) (cadr xscale))
+				  (car xscale)))
 			      xstep))
     (newline)))
 
 (define (charplot:plot! data xlabel ylabel)
+  (cond ((array? data)
+	 (set! data (map (lambda (lst) (cons (car lst) (cadr lst)))
+			 (array->list data)))))
   (let* ((xmax (apply max (map car data)))
 	 (xmin (apply min (map car data)))
 	 (xscale (find-scale charplot:width (- xmax xmin)))
@@ -139,4 +147,14 @@
 			  data)
 		     xlabel ylabel xmin xscale ymin yscale)))
 
+(define (plot-function func vlo vhi . npts)
+  (set! npts (if (null? npts) 100 (car npts)))
+  (let ((dats (make-array 0.0 npts 2)))
+    (array-index-map! (make-shared-array dats (lambda (idx) (list idx 0)) npts)
+		      (lambda (idx) (+ vlo (* (- vhi vlo) (/ idx npts)))))
+    (array-map! (make-shared-array dats (lambda (idx) (list idx 1)) npts)
+		func
+		(make-shared-array dats (lambda (idx) (list idx 0)) npts))
+    (charplot:plot! dats "" "")))
+
 (define plot! charplot:plot!)
-- 
cgit v1.2.3