# d3-polygon This module provides a few basic geometric operations for two-dimensional polygons. Each polygon is represented as an array of two-element arrays [[x1, y1], [x2, y2], …], and may either be closed (wherein the first and last point are the same) or open (wherein they are not). Typically polygons are in counterclockwise order, assuming a coordinate system where the origin ⟨0,0⟩ is in the top-left corner. ## Installing If you use npm, `npm install d3-polygon`. You can also download the [latest release on GitHub](https://github.com/d3/d3-polygon/releases/latest). For vanilla HTML in modern browsers, import d3-polygon from Skypack: ```html ``` For legacy environments, you can load d3-polygon’s UMD bundle from an npm-based CDN such as jsDelivr; a `d3` global is exported: ```html ``` ## API Reference # d3.polygonArea(polygon) [<>](https://github.com/d3/d3-polygon/blob/master/src/area.js "Source Code") Returns the signed area of the specified *polygon*. If the vertices of the polygon are in counterclockwise order (assuming a coordinate system where the origin ⟨0,0⟩ is in the top-left corner), the returned area is positive; otherwise it is negative, or zero. # d3.polygonCentroid(polygon) [<>](https://github.com/d3/d3-polygon/blob/master/src/centroid.js "Source Code") Returns the [centroid](https://en.wikipedia.org/wiki/Centroid) of the specified *polygon*. # d3.polygonHull(points) [<>](https://github.com/d3/d3-polygon/blob/master/src/hull.js#L23 "Source Code")

Returns the [convex hull](https://en.wikipedia.org/wiki/Convex_hull) of the specified *points* using [Andrew’s monotone chain algorithm](http://en.wikibooks.org/wiki/Algorithm_Implementation/Geometry/Convex_hull/Monotone_chain). The returned hull is represented as an array containing a subset of the input *points* arranged in counterclockwise order. Returns null if *points* has fewer than three elements. # d3.polygonContains(polygon, point) [<>](https://github.com/d3/d3-polygon/blob/master/src/contains.js "Source Code") Returns true if and only if the specified *point* is inside the specified *polygon*. # d3.polygonLength(polygon) [<>](https://github.com/d3/d3-polygon/blob/master/src/length.js "Source Code") Returns the length of the perimeter of the specified *polygon*.

c	File Name	Size	T	Date
zip	dist/	4096	---	2026-06-10 03:35:39
zip	src/	4096	---	2026-06-10 03:35:40
-	LICENSE	731	%	2026-05-20 11:21:42
-	README.md	3088	md	2026-05-20 11:21:42
-	package.json	1589	json	2026-05-20 11:21:42

🌲 / quartz node_modules d3-polygon

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