[racket] image.ss: can one make a rotation-invariant middle?

From: Robby Findler (robby at eecs.northwestern.edu)
Date: Sun Feb 6 08:26:16 EST 2011

I've pushed a change that makes place-image/align not insist on the
second image argument having a pinhole. That was too much checking.

Does that help?


On Sat, Feb 5, 2011 at 9:05 PM, Yaron Minsky <yminsky at gmail.com> wrote:
> In playing around with image.ss, I've run into the following problem: the
> center of an image does not appear to be rotation invariant.  Thus, if you
> use place-image/align in order to place a triangle, say, that you then
> rotate continuously, you will see the triangle wobble as its effective
> center moves around.
> Is there any way around this?  I tried using pinholes, but pinholes seem to
> require that all images involved have pinholes, which is not quite what I'm
> going for.  What I really want to do is to declare a stable center for an
> image, but I can't quite figure out how to do that.
> y
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