On Dec 19, 2012, at 3:47 PM, Miguel Villaverde wrote: > While working on HTDP2, I noticed the following: place-image seems to snip > the last column and row of pixels in its background image. This does not > happen when using overlay instead, or if the background is a scene. > place-image/align shows the same behavior: > > (require 2htdp/image) > > (define CIRCLE (circle 5 "solid" "red")) > (define RECTANGLE (rectangle 100 100 "outline" "black")) > (define SCENE (empty-scene 100 100)) > > (place-image CIRCLE 50 50 RECTANGLE) > (overlay CIRCLE RECTANGLE) > (place-image CIRCLE 50 50 SCENE) > (overlay CIRCLE SCENE) > > (place-image/align CIRCLE 50 50 "center" "center" RECTANGLE) > > If you run that, you'll notice the rectangle has lost its right and bottom > borders in the first and last images. This is using the beginner student > language in DrRacket 5.3.1. > > Is this a bug? Is it intended behavior? If so, why?
This is not a bug but an unfortunate feature. The documentation for 2htdp/image has a section on the details of drawing things with pen (bottom). > BTW, what is the appropiate #lang instruction for bsl, in case I want to > determine language from source? Is there one? Thanks. #lang bsl does not work properly yet. -- Matthias ____________________ Racket Users list: http://lists.racket-lang.org/users
