determine if a point is inside a polygon with a ray intersection counting algorithm

An adaptation of the original pointinpolygon algorithm developed in php at assemblysys.com

uSketch v2 の shape プラグインを書くときに使う共通ユーティリティ集。 サードパーティが `@acme/usketch-plugin-shape-foo` のような独自 shape プラグインを実装する際、bounds 計算・ヒットテスト・リサイズ・GPU primitive の差し込みをここから取ってくる想定。

A 2D collision checker for modern JavaScript games.

GeoJSON Utilities for Typescript

Pure 2D geometry — vectors, matrices, bounds, color and intersection. L0, no DOM, no dependencies.

Fast point in polygon algorithm

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This package will help you to identify if a (latitude / longitude) is within a circular or polygonal geofence

> Easy way to test points in circles and polygons, perfect for maps.

Generic spatial relationship proof primitives for Totem Edge — geometry hashes, geofence relations, route checks, and proof envelope integration

The rendering layer: a Surface interface with a Canvas2D backend, color derivation, and the isometric solid kit that makes procedural art read as designed.

JavaScript library for check point in polygon

Maptec geometry library for spatial relationships

2D geometry helpers: distances, polygon area and centroid (shoelace), point-in-polygon, segment intersection, convex hull and the haversine great-circle distance.

An implementation of browserstorage that compresses data before storing it and