From: Luke Cowell <lcowell@...>
Date: 2009-06-16T13:14:16+09:00
Subject: Re: Matrix Rotator (#209)

My solution:

  def self.rotate(rect)
    rotated = []
    rect.each_with_index do |row, irow|
      row.reverse.each_with_index do |col, icol|
        rotated[icol] ||= []
        rotated[icol][irow] = col
      end
    end
    rotated
  end

It works by reversing the elements in the row and then swapping elements 
in the x & y  axis.

Luke
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