Shapes from paths and animations

Hi,

I was wondering.  If you create a shape with a few paths, and want that shape to be
animated along that path, which point of the shape is connected to a path.  For
example, suppose i had the following (not in SVG for simplicity):

Shape( M 1 1 L 2 2 L 2 1 z)

and i wante the vertex of this shape (in this case (1, 1) because that's where I
started it) to move along:

Path( M 1 1 L 5 5) so i would want this thing to move along its diagonal axis, how
would i accomplish this sort of thing.  It seemed that it actually moved slighly
differently when i tried this in real life.

Thanks,

Martin

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