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 1 ```// Type definitions for D3JS d3-polygon module 3.0 ``` 2 ```// Project: https://github.com/d3/d3-polygon/, https://d3js.org/d3-polygon ``` 3 ```// Definitions by: Tom Wanzek ``` 4 ```// Alex Ford ``` 5 ```// Boris Yankov ``` 6 ```// Nathan Bierema ``` 7 ```// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped ``` 8 ``` ``` 9 ```// Last module patch version validated against: 3.0.1 ``` 10 ``` ``` 11 ```/** ``` 12 ``` * Returns the signed area of the specified polygon. If the vertices of the polygon are in counterclockwise order ``` 13 ``` * (assuming a coordinate system where the origin <0,0> is in the top-left corner), the returned area is positive; ``` 14 ``` * otherwise it is negative, or zero. ``` 15 ``` * ``` 16 ``` * @param polygon Array of coordinates , and so on. ``` 17 ``` */ ``` 18 ```export function polygonArea(polygon: Array<[number, number]>): number; ``` 19 ``` ``` 20 ```/** ``` 21 ``` * Returns the centroid of the specified polygon. ``` 22 ``` * ``` 23 ``` * @param polygon Array of coordinates , and so on. ``` 24 ``` */ ``` 25 ```export function polygonCentroid(polygon: Array<[number, number]>): [number, number]; ``` 26 ``` ``` 27 ```/** ``` 28 ``` * Returns the convex hull of the specified points using Andrew’s monotone chain algorithm. ``` 29 ``` * The returned hull is represented as an array containing a subset of the input points arranged in ``` 30 ``` * counterclockwise order. Returns null if points has fewer than three elements. ``` 31 ``` * ``` 32 ``` * @param points Array of coordinates , and so on. ``` 33 ``` */ ``` 34 ```export function polygonHull(points: Array<[number, number]>): Array<[number, number]> | null; ``` 35 ``` ``` 36 ```/** ``` 37 ``` * Returns true if and only if the specified point is inside the specified polygon. ``` 38 ``` * ``` 39 ``` * @param polygon Array of coordinates , and so on. ``` 40 ``` * @param point Coordinates of point . ``` 41 ``` */ ``` 42 ```export function polygonContains(polygon: Array<[number, number]>, point: [number, number]): boolean; ``` 43 ``` ``` 44 ```/** ``` 45 ``` * Returns the length of the perimeter of the specified polygon. ``` 46 ``` * ``` 47 ``` * @param polygon Array of coordinates , and so on. ``` 48 ``` */ ``` 49 ```export function polygonLength(polygon: Array<[number, number]>): number; ```