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topo

0.5.0

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Geometry library for determining spatial relationships between geometries

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Readme 10 Versions 3 Dependencies Dependants Files Activity

topo lib topo point_line.ex

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lib/topo/point_line.ex

defmodule Topo.PointLine do
  @moduledoc false

  @spec relate(list, {number, number}) :: atom
  def relate([_], _), do: :disjoint

  def relate([a, b | rest], p) do
    cond do
      a == p -> :vertex
      b == p -> :vertex
      Topo.Util.collinear?(a, b, p) && Topo.Util.between?(a, b, p) -> :edge
      true -> relate([b | rest], p)
    end
  end
end

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