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Informations about the package polyclip

Polyclip

Polyclip is a PHP library designed, based on polyclip-ts for performing geometric operations on polygons and multi-polygons, including union, intersection, XOR, and difference. It supports input and output in GeoJSON format and leverages a sweep line algorithm for efficient computation. The library uses Brick\Math for high-precision arithmetic, ensuring accurate handling of large or small coordinates, and SplayTree for efficient data management.

Installation

Install Polyclip with composer. Run:

Dependencies:

Usage

Basic Operations

The Clipper class provides static methods to perform geometric operations. You can pass multiple geometries as separate arguments or as a single FeatureCollection. Each method returns a GeoJson\Feature\Feature object with the resulting geometry and empty properties.

Union: Combines multiple geometries into a single geometry.

Intersection: Computes the overlapping area of multiple geometries.

XOR: Computes the symmetric difference (exclusive or) between geometries.

Difference: Subtracts one or more geometries from a subject geometry.

Using a FeatureCollection:

Input Formats

Geometries can be provided in the following formats:

GeoJson Objects: Use classes like GeoJson\Geometry\Polygon or GeoJson\Geometry\MultiPolygon.

GeoJSON Strings:

Arrays: Coordinate arrays representing polygons or multi-polygons.

Setting Precision

To handle floating-point precision issues (e.g., near-coincident points), set an epsilon value for comparisons:

This epsilon determines how close two points can be before they’re considered equal, which is crucial for robust geometric computations.

Error Handling

Ensure your input geometries are valid. The library throws \InvalidArgumentException for:

Wrap calls in a try-catch block if needed:

Notes

Limitations

Contributing

Contributions are welcome! Feel free to:

Please include tests and documentation updates with your contributions.

License

This project is MIT Licensed


All versions of polyclip with dependencies

PHP Build Version
Package Version
Requires ext-bcmath Version *
php Version ^8.2
jmikola/geojson Version ^1.0
willvincent/splaytree Version ^1.3
brick/math Version ^0.12.1
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