Here is how to do it using MetaPict:

#lang racket
(require racket/draw metapict)

(set-curve-pict-size 300 300)  ; width and height of image
(ahlength  1.0)                ; size of arrow head

(define p
  (with-window (window -12 12 -12 12)             ; xmin, xmax, ymin, ymax
    (draw (draw-arrow (curve (pt -10   0) -- (pt 10  0)))  ; x-axis
          (draw-arrow (curve (pt   0 -10) -- (pt  0 10)))  ; y-axis
          (label-rt  "x" (pt 10.2 0))                      ; label for x
axis
          (label-top "y" (pt 0 10.2))                      ; label for y
axis
          (circle (pt 2 1) 3))))                           ; center (2,1)
radius 3

p ; show pict in repl

(define (save-pict-as-svg p width height filename [exists 'replace])
  (define dc (new svg-dc%
                  [width width]
                  [height height]
                  [output filename]
                  [exists exists]))
  (send dc start-doc "An SVG Test")  ; a message
  (send dc start-page)
  (draw-pict p dc 0 0)
  (send dc end-page)
  (send dc end-doc))



(save-pict-as-svg p 300 300 "output.svg")


2017-10-23 21:04 GMT+02:00 Lawrence Bottorff <borg...@gmail.com>:

> I'd like to use Racket to generate scalable (svg?) graphics like gnuplot
> or GeoGebra does. For example, I'd like to create a cartesian coordinate
> graph system, then draw functions on it. One thing in particular would be
> to draw a graph of a circle based on the standard form of a circle, e.g.,
> x^2 + y^2 = r^2. Again, I'd prefer being able to create an svg file. Is
> there a tutorial that might give me more insight than the reference pages
> or the Quick: An Introduction to Racket with Pictures? Or am I barking up
> the wrong tree?
>
> LB
>
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-- 
-- 
Jens Axel Søgaard

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