Here is how to do it using MetaPict:
(require racket/draw metapict)
(set-curve-pict-size 300 300) ; width and height of image
(ahlength 1.0) ; size of arrow head
(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
(label-top "y" (pt 0 10.2)) ; label for y
(circle (pt 2 1) 3)))) ; center (2,1)
p ; show pict in repl
(define (save-pict-as-svg p width height filename [exists 'replace])
(define dc (new svg-dc%
(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?
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Jens Axel Søgaard
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