CGAL 5.2.1 - 2D Snap Rounding
Bibliography
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Leonidas Guibas and David Marimont. Rounding arrangements dynamically. Internat. J. Comput. Geom. Appl., 8:157–176, 1998.

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D. Halperin and E. Packer. Iterated snap rounding. Computational Geometry: Theory and Applications, 23(2):209–225, 2002.

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J. D. Hobby. Practical segment intersection with finite precision output. Comput. Geom. Theory Appl., 13(4):199–214, October 1999.