use Data::Dumper;
  use Math::ConvexHull qw/convex_hull/;
  
  print Dumper convex_hull(
  [
    [0,0],     [1,0],
    [0.2,0.9], [0.2,0.5],
    [0,1],     [1,1],
  ]
  );
  
  # Prints out the points [0,0], [1,0], [0,1], [1,1].