Add a M120C-like piece finding functionality.

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Super-beneficial for the bigger puzzles, and actually fully necessary when 
there are lots of colors.

We can use the gravitation3D piece finding functionality as a model.

Original issue reported on code.google.com by roi...@gmail.com on 19 Oct 2009 at 12:27

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How would we implement piece finding functionality for cases where there are no 
fixed
centers to each block?  What about the case where there are multiple pieces 
that are
indistinguishable?  Whatever the final implementation is, I think that it 
should show
you all the possible pieces you are looking for, otherwise it might make parity 
cases
easy to avoid if it found the exact piece you are looking for.

Original comment by project....@gmail.com on 1 Nov 2009 at 3:26

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I was actually working on a patch that did this.  I'm still getting up to speed 
with
the code and I'm sure my patch wouldn't be as good as what you two come up 
with.  I
haven't used MagicCell120 so I don't know how the feature works there but I was
thinking of highlighting cubes not by color but by type of piece.  The idea is 
that
if you hold shift while hovering over a piece, all pieces of that type will be
highlighted.  For solving large hypercubes this would cut down on the long time 
spent
solving the 1c center pieces.

This would be an alternate solution to the ones I suggested for issue 92.

Original comment by bmenr...@gmail.com on 21 Nov 2009 at 10:50

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These are related but different problems. Differentiating piece types is helpful
because it can help reduce the visual complexity, whereas a piece-finder let's 
you
quickly see your immediate goal. I recommend that in order to increase the 
chances of
incorporating your patch, that you familiarize yourself with the Magic120Cell
behavior of both of these features before getting very far into alternative
solutions. Thanks!

Original comment by cutelyaw...@gmail.com on 21 Nov 2009 at 11:18

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Original comment by cutelyaw...@gmail.com on 29 Nov 2009 at 9:17

• Changed title: Add a M120C-like piece finding functionality.