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my @points = ( [0,0], [2, 0],  [0, 2], [2, 2] );

[
  [1, 0, 1, 0, 1], # X=1 for points 0, 1
...
  [1, 1, 2, 0, 3], # X+Y=2 for points 0, 3
  [1, 0, 1, 2, 3], # X=1 for points 2, 3
]

[
  [3, 1, 0],   # Edge from (1,1) to (1,1)
...
  [2, 0, -1],
  [0, 0, -1]
]

[
  [1, 1],
  [1, 1]
]