BrowserUk:

Sorry, I should've been more clear. I wasn't referring to the vertices, but the input points to the algorithm. So the diagonal line going through two of the points are the bisector for the other two corners. I put this case into the algorithm (just a few minutes ago):

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

[download]

Yields the following lines:

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

[download]

That fourth entry is the diagonal I was talking about. It's clearly the bisector for points 0 and 3, but since it intersects at the same point as the first two, it's irrelevant. Looking at the edge list:

[
  [3, 1, 0],   # Edge from (1,1) to (1,1)
  [1, -1, 1],
  [4, -1, 1],
  [2, 0, -1],
  [0, 0, -1]
]

[download]

Other than the first edge, the rest are as you'd expect to see. I'm suspecting some odd comparison (or roundoff) in the C code to be generating that 0-length segment.

Just for completeness, here's the list of vertices:

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

[download]

Looking at the results, I'm struck by a couple items:

...roboticus

Update: I just tried the cross that you suggested, and the data showed *absolutely no* anomalies....odd!

Update: Fixed HTML (missed closer for UL).

In reply to Re^4: Better maps with Math::Geometry::Voronoi, and a Challenge for Math Monks by roboticus
in thread Better maps with Math::Geometry::Voronoi, and a Challenge for Math Monks by samtregar

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