Excellent, thanks, Jens. I changed the line-to to move-to in order to not draw over the filled color. -Ian ----- Original Message ----- From: "Jens Axel Søgaard" <jensa...@soegaard.net> To: "J. Ian Johnson" <i...@ccs.neu.edu> Cc: "users" <users@racket-lang.org> Sent: Friday, September 20, 2013 2:11:12 PM GMT -05:00 US/Canada Eastern Subject: Re: [racket] Annulus with dc%?
Here is one way to draw an annulus on a 400x400 bitmap with center (200,200) and radii 100 and 200 respectively. #lang racket ( require racket/draw ) ( define bm ( make-object bitmap% 400 400 )) ( define dc ( new bitmap-dc% [ bitmap bm ])) ( define p ( new dc-path% )) ( send p move-to 300 200 ) ( send p arc 100 100 200 200 0 ( * 2 pi )) ( send p line-to 400 200 ) ( send p arc 0 0 400 400 0 ( * 2 pi )) ( send p close ) ( define blue ( send the-color-database find-color "blue" )) ( define blue-brush ( send the-brush-list find-or-create-brush blue 'solid )) ( define blue-pen ( send the-pen-list find-or-create-pen blue 0 'solid )) ( send dc set-brush blue-brush ) ( send dc set-pen blue-pen ) ( send dc draw-path p ) bm 2013/9/20 J. Ian Johnson < i...@ccs.neu.edu > I'm trying to make some visuals for a slideshow presentation, and I want to have a ring with borders (inner and outer ring borders) to draw over another image, thus a transparent center is necessary. I haven't been able to find a way to do this with the current API. Anyone have a suggestion (other than, "don't do that")? Thanks, -Ian ____________________ Racket Users list: http://lists.racket-lang.org/users -- -- Jens Axel Søgaard ____________________ Racket Users list: http://lists.racket-lang.org/users
