AngusJohnson/Clipper2
C++Polygon Clipping, Offsetting & Triangulation in C++, C# and Delphi
Clipper2
A Polygon Clipping, Offsetting and Triangulation library (in C++, C# & Delphi)
The Clipper2 library performs intersection, union, difference and XOR boolean operations on both simple and complex polygons. It also performs polygon offsetting, and Constrained Delaunay Triangulation. This is a major update of my original Clipper library that was written about 15 years ago. That library I'm now calling Clipper1, and while it still works very well, Clipper2 is just better.
- CAUTION: The triangulation code is buggy and I regret releasing it when I did.
- I'm working on fixes but these may still be weeks away. Sorry.
Compilers
Clipper2 can be compiled using any one of three supported programming languages: C++, or C#, or Delphi Pascal. The library can also be accessed from other languages by dynamically linking to exported functions in the C++ compiled Clipper2 library. (The C++ compiled code is measurably faster so, where performance is critical, even C# and Delphi developers may prefer this approach in application development.)
| Lang. | Requirements |
|---|---|
| C++: | Requires C++17, or |
| C#: | The library uses Standard Library 2.0 but the sample code uses .NET6, or |
| Delphi: | Compiles with any version of Delphi from version 7 to current. |
Documentation
Examples
Clipping
C++
https://github.com/AngusJohnson/Clipper2/blob/fa7add77364eb3877dd1b8caf9b3cbd5486347f6/CPP/Examples/SimpleClipping/SimpleClipping.cpp#L29-L34C#
https://github.com/AngusJohnson/Clipper2/blob/fa7add77364eb3877dd1b8caf9b3cbd5486347f6/CSharp/Clipper2Lib.Examples/ConsoleDemo/Main.cs#L112-L116Delphi
https://github.com/AngusJohnson/Clipper2/blob/fa7add77364eb3877dd1b8caf9b3cbd5486347f6/Delphi/Examples/Example1/Example1.dpr#L21-L26
Inflating (aka Offsetting)
C++
https://github.com/AngusJohnson/Clipper2/blob/fa7add77364eb3877dd1b8caf9b3cbd5486347f6/CPP/Examples/Inflate/Inflate.cpp#L36-L47C#
https://github.com/AngusJohnson/Clipper2/blob/fa7add77364eb3877dd1b8caf9b3cbd5486347f6/CSharp/Clipper2Lib.Examples/InflateDemo/Main.cs#L89-L100Delphi
https://github.com/AngusJohnson/Clipper2/blob/fa7add77364eb3877dd1b8caf9b3cbd5486347f6/Delphi/Examples/Example2/Example2.dpr#L20-L31
Constrained Delaunay Triangulation
C++
https://github.com/AngusJohnson/Clipper2/blob/fa7add77364eb3877dd1b8caf9b3cbd5486347f6/CPP/Examples/Triangulation/Triangulation.cpp#L135-L138C#
https://github.com/AngusJohnson/Clipper2/blob/fa7add77364eb3877dd1b8caf9b3cbd5486347f6/CSharp/Clipper2Lib.Examples/Triangulation/Main.cs#L110-L115Delphi
https://github.com/AngusJohnson/Clipper2/blob/fa7add77364eb3877dd1b8caf9b3cbd5486347f6/Delphi/Examples/Triangulation/ClipperTri.dpr#L28-L33