[racket] rotate an image using 2htdp/image

From: Stephen Bloch (sbloch at adelphi.edu)
Date: Mon Jul 19 13:09:48 EDT 2010

On Jul 19, 2010, at 11:54 AM, Mathew Kurian <bluejamesbond at gmail.com> wrote:

> I am trying to rotate an image around a certain point. Using the 2htdp/image and its rotate function, it seems to be rotating the image.
> But what is it rotating around?

In a sense, it's the center (more precisely, the center of the bounding rectangle).  But to do what you probably want to do, here's a little trick:  overlay it on a white or transparent circle large enough to completely contain it.  Wherever you put the center of the circle, that's what it'll rotate around.

Steve Bloch

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