On Thu, Dec 20, 2012 at 4:23 PM, Matthias Felleisen <matth...@ccs.neu.edu>wrote:
> > 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). > > This section is actually the first one in the image guide: http://docs.racket-lang.org/teachpack/2htdpimage-guide.html Robby
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