Name: d3-polygon
Owner: D3
Description: Geometric operations for two-dimensional polygons.
Created: 2015-07-07 01:07:47.0
Updated: 2018-01-01 07:55:05.0
Pushed: 2017-03-10 17:56:40.0
Size: 39
Language: JavaScript
GitHub Committers
| User | Most Recent Commit | # Commits |
|---|---|---|
| Mike Bostock | 2017-03-10 17:56:28.0 | 39 |
| Aboorva Devarajan | 2016-08-13 16:52:29.0 | 1 |
Other Committers
| User | Most Recent Commit | # Commits |
|---|
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.
If you use NPM, npm install d3-polygon. Otherwise, download the latest release. You can also load directly from d3js.org, either as a standalone library or as part of D3 4.0. AMD, CommonJS, and vanilla environments are supported. In vanilla, a d3 global is exported:
ipt src="https://d3js.org/d3-polygon.v1.min.js"></script>
ipt>
hull = d3.polygonHull(points);
ript>
Try d3-polygon in your browser.
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) <>
Returns the centroid of the specified polygon.
Returns the convex hull of the specified points using Andrew?s monotone chain algorithm. 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) <>
Returns true if and only if the specified point is inside the specified polygon.
# d3.polygonLength(polygon) <>
Returns the length of the perimeter of the specified polygon.