Thanks --- I think I've fixed alignment for drawing to a bitmap with a backing scale.
At Fri, 03 Jan 2014 19:33:22 -0700, Neil Toronto wrote: > On 01/03/2014 06:12 PM, mfl...@racket-lang.org wrote: > > bd4d0b7 Matthew Flatt <mfl...@racket-lang.org> 2014-01-03 17:57 > > : > > | if a bitmap has a non-1 backing scale, always draw smoothly to other > contexts > > : > > M pkgs/draw-pkgs/draw-lib/racket/draw/private/dc.rkt | 11 ++++++----- > > Cool. It looks like this solved another issue as well: drawing 2x > bitmaps in the REPL would smooth only intermittently. > > There appears to be a problem with drawing in 'unsmoothed mode onto a > bitmap with a backing scale. I've attached a program that demonstrates > using a single polygon and with plots. > > In the single polygon test, the triangle drawn onto the 2x bitmap is > shifted down and to the right one pixel. > > The code that draws a plot onto a 2x bitmap simulates the change I would > make to Plot to take advantage of the new backing scale feature. The > edge of the sphere looks lumpy, probably because polygons are drawn > unsmoothed and their vertices are being snapped to the wrong places. The > second plot shows how it's supposed to look. > > The last two plots show how each looks before being scaled down. The > lumpiness around the edge is probably easier to see this way. > > Neil ⊥ > > > ------------------------------------------------------------------------------ > [text/plain "unsmoothed-polygons.rkt"] [~/Desktop & open] [~/Temp & open] > _________________________ > Racket Developers list: > http://lists.racket-lang.org/dev _________________________ Racket Developers list: http://lists.racket-lang.org/dev
