Scott David Daniels wrote:
> Your equation for y uses the new x, not the old x. Be more free with
> names. Here's one way to write it:
>
> class ...
> def rotate(self, angle):
> '''Rotate point angle radians around relPoint'''
> x, y = self.coords
> xRel, yRel = self.relPoint
> sin, cos = math.sin(angle), math.cos(angle)
> newx = x * cos - y * sin - xRel * cos + yRel * sin + xRel
> newy = x * sin + y * cos - xRel * sin - yRel * cos + yRel
> self.coords = newx, newy
and here's another one:
http://online.effbot.org/2004_09_01_archive.htm#tkinter-complex
</F>
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