GeomPP 0.5.0

.NET 10.0 This package targets .NET 10.0. The package is compatible with this framework or higher. .NET Framework 4.8 This package targets .NET Framework 4.8. The package is compatible with this framework or higher.
There is a newer version of this package available.
See the version list below for details. 
dotnet add package GeomPP --version 0.5.0
                    


                    

                
NuGet\Install-Package GeomPP -Version 0.5.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="GeomPP" Version="0.5.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="GeomPP" Version="0.5.0" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="GeomPP" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add GeomPP --version 0.5.0
                    


                    

                
#r "nuget: GeomPP, 0.5.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package GeomPP@0.5.0
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=GeomPP&version=0.5.0
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=GeomPP&version=0.5.0
                    


                            Install as a Cake Tool

C# bindings for geompp, a C++20 geometry library.
     Provides Point2D/3D, Vector2D/3D, Line2D/3D, Ray2D/3D, LineSegment2D/3D,
     Polyline2D/3D, Triangle2D/3D, Polygon2D/3D, BBox2D/3D, Plane — with full
     operator support, intersection queries, WKT serialization, and file I/O.
     Built with C++/CLI for Windows x64. Targets both .NET 10 and .NET Framework 4.8.

Product Compatible and additional computed target framework versions.
.NET net10.0-windows7.0 is compatible. 
.NET Framework net48 is compatible.  net481 was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

  • .NETFramework 4.8

    • No dependencies.

  • net10.0-windows7.0

    • No dependencies.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
0.17.3 98 8/15/2026
0.17.2 92 8/14/2026
0.16.2 87 8/6/2026
0.15.1 119 7/24/2026
0.14.0 104 7/21/2026
0.13.0 117 7/9/2026
0.12.0 103 7/8/2026
0.11.0 110 7/4/2026
0.10.1 124 6/23/2026
0.9.1 222 6/17/2026
0.8.2 117 5/18/2026
0.8.0 111 5/18/2026
0.7.0 104 5/6/2026
0.6.0 104 5/4/2026
0.5.0 103 5/1/2026
0.4.0 115 4/27/2026
0.1.2 124 4/13/2026
0.1.1 123 4/13/2026
0.1.0 125 4/9/2026

> C++ library — tagged `v0.5.0` · C# / NuGet — tagged `csharp-v0.5.0` · Python / PyPI — tagged `python-v0.5.0`

### Added

**C++ core**
- `Axis` enum (`X`, `Y`, `Z`) in `vector3d.hpp` — axis identifier used by the dominant-axis algorithm.
- `Vector3D::DominantAxis()` — returns the `Axis` whose absolute component is largest; used internally by the 3D shoelace formula and available as a public API.
- `Point2D::operator+=(Vector2D const&)` and `Point3D::operator+=(Vector3D const&)` — in-place point translation.
- `Point2D operator/(Point2D, double)` and `Point3D operator/(Point3D, double)` — scalar division (throws on division by zero).
- `centroid(std::vector<Point2D> const&)` free function (declared in `point2d.hpp`) — shoelace-formula centroid of a 2D polygon ring.
- `centroid(std::vector<Point3D> const&, std::optional<Plane>)` free function (declared in `plane.hpp`) — 3D centroid; auto-detects the plane if not supplied.
- `Polygon2D::Perimeter()` — sum of outer-ring edge lengths (holes excluded).
- `Polygon3D::Perimeter()` — sum of outer-ring edge lengths.
- `Polygon3D::Centroid()` — area-weighted centroid; hole areas contribute with negative weight.
- `Polygon3D::GetPlane()` — returns the `Plane` stored on construction.

**C# / NuGet**
- `Polygon2D.Perimeter()` and `Polygon3D.Perimeter()` exposed.
- `Polygon3D.Centroid()` and `Polygon3D.GetPlane()` exposed.

**Python / PyPI**
- `Axis` enum exposed (`geompp.Axis.X / .Y / .Z`).
- `Vector3D.dominant_axis()` exposed.
- `Point2D.__iadd__(Vector2D)` and `Point3D.__iadd__(Vector3D)` exposed (`p += v` syntax).
- `Polygon2D.perimeter()` and `Polygon3D.perimeter()` exposed.
- `Polygon3D.centroid()` and `Polygon3D.get_plane()` exposed.
- `centroid(points)` (2D list) and `centroid(points, plane)` (3D list) free functions exposed.
- `signed_area(points, plane)` (3D) free function exposed.

### Fixed

**C++ core**
- `Polygon2D::Centroid()` with holes: the weighted sum was computing `hole_area²` instead of `hole_area`, producing wrong centroids whenever holes were present. Also fixed an MSVC `C2672: std::construct_at` build error caused by pre-sizing a `std::vector<std::pair<Point2D, double>>` over a type with no default constructor — rewritten to use `reserve()` + range iteration.
- `signed_area(std::vector<Point3D>, Plane)`: now throws `std::runtime_error` for fewer than 3 unique points (previously returned 0 silently).

### Removed

**C++ core (breaking)**
- `Polygon2D::SignedArea()` — removed. Use the free function `signed_area(points)` (2D) instead.
- `Polygon3D::SignedArea()` — removed. Use the free function `signed_area(points, plane)` (3D) instead.

**C# / NuGet (breaking)**
- `Polygon2D.SignedArea()` and `Polygon3D.SignedArea()` removed to match the C++ API change above.

### Tests

**C++ (`geompp_tests`)**
- `test_point2d.cpp`: added `AddVectorInPlace` (3 cases).
- `test_point3d.cpp`: added `AddVectorInPlace` (3 cases).
- `test_plane.cpp`: added 9 `Centroid_*` tests for the 3D `centroid()` free function.
- `test_polygon2d.cpp`: added `Centroid_SquareWithCenteredHole`, `Centroid_SquareWithOffCenterHole`; added `Perimeter_Square`, `Perimeter_Rectangle`, `Perimeter_Triangle`.
- `test_polygon3d.cpp`: added `Centroid_Square`, `Centroid_ElevatedSquare`, `Centroid_Triangle`, `Centroid_NonXYPlane`, `Centroid_SquareWithCenteredHole`, `Centroid_SquareWithOffCenterHole`; added `Perimeter_Square`, `Perimeter_NonXYPlane`, `Perimeter_Triangle`.

**C# (`geompp_csharp/tests`)**
- `Polygon2D`: added `Perimeter_Square`, `Perimeter_Rectangle`, `Centroid_Square`, `Centroid_Rectangle`.
- `Polygon3D`: added `Perimeter_Square`, `Perimeter_NonXYPlane`, `Centroid_Square`, `Centroid_ElevatedSquare`, `GetPlane_XYPlane_NormalPointsInZ`, `GetPlane_ContainsAllVertices`.

**Python (`geompp_python/tests`)**
- `TestVector3D`: added `test_dominant_axis`.
- `TestPoint2D`: added `test_iadd_vector`, `test_iadd_zero_vector_unchanged`.
- `TestPoint3D`: added `test_iadd_vector`, `test_iadd_zero_vector_unchanged`.
- `TestPolygon2D`: added `test_perimeter_square`, `test_perimeter_rectangle`, `test_perimeter_triangle`.
- `TestPolygon3D`: added `test_perimeter_square`, `test_perimeter_non_xy_plane`, `test_perimeter_triangle`, `test_get_plane_returns_plane`, `test_get_plane_contains_all_vertices`, `test_get_plane_with_holes`.
- `TestCentroid3D` (new class): 6 tests for `centroid(points)` and `centroid(points, plane)`.

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