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Question: how to sort a coordinate points

Question:how to sort a coordinate points

miname 15 Maple 14
sort
October 03 2013
1

 hi everyone,   

I have a list of coordinates  and would like to sort them so that in the new order, the last coordinate will be the first coordinate and the first coordinate will be the first: 

   for example:  

  P:=array([[1,4],[2,3],[3,2],[4,1],[6,5],[6,1]]):   

should sort to  

  P:=array[ [6,1], [6,5], [4,1],[3,2],[2,3],[1,4]]  

 

  There must be an intelligent way to do this.  

  thanks for the help;
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