No, I don't think it does. The drawing operation is called "over" and it takes two colors (rgb, say), and an alpha and produces a color (rgb). So you always start with some solid color in the background and draw the shape on top of it, resulting in another color that some other shape can be drawn on top of.
On Fri, Feb 22, 2013 at 3:45 PM, Sam Tobin-Hochstadt <sa...@ccs.neu.edu>wrote: > On Fri, Feb 22, 2013 at 4:40 PM, <ro...@racket-lang.org> wrote: > > > > + The list of colors is obtained by drawing the image on a white > > + background and then reading off the colors of the pixels that were > drawn. > > Is there a particular reason to choose white, as opposed to clear, for > the background in this test? Does drawing on a "clear" background > even make any sense in this case? > > Sam >
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