The Clipper library performs clipping and offsetting for both lines and polygons. All four boolean clipping operations are supported - intersection, union, difference and exclusive-or. Polygons can be of any shape including self-intersecting polygons.

17 March 2016:
Since it's been some time since the last update, some may be wondering if I no longer plan further updates. I do have plans for more updates but I also have a chronic health condition (not life threatening) that's set me back, and I don't really have a good idea when I'll restart development.


  • Line and polygon clipping - intersection, union, difference & xor
  • Line and polygon offsetting with 3 types of joining - miter, square and round
  • Polygons can be of any shape, including self-intersecting polygons
  • Minkowski Addition and Minkowski Difference functions included
  • The library is written in Delphi, C++, C# and Python
  • Comprehensive documentation
  • Demos use AGG, Cairo, OpenGL, GDI+ & Graphics32 graphics libraries
  • The library is significantly faster than commercial alternatives
  • Third-party modules for Perl, Ruby and Python languages

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  • Using GIS data frequently encountered datastet cut up regular grid, and this library is not suitable for this. (see Open Discussion).

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Programming Language

C#, Python, C++, Delphi/Kylix, Free Pascal