geometry-fns

A collection of functions for working with points geometry.

Installation

npm i geometry-fns --save

API

areIntersected

判断两根直线是否相交，传入两条直线的起点和终点的x和y坐标。

import { areIntersected } from 'geometry-fns'

function areIntersected(
  qx1: number, 
  qy1: number, 
  qx2: number, 
  qy2: number, 
  lx1: number, 
  ly1: number, 
  lx2: number, 
  ly2: number
): boolean

crossOverExperiments

跨立实验(求向量的叉积)，传入一条直线的起点和终点的x和y坐标，跟另一个点的x和y坐标做跨立实验。

import { crossOverExperiments } from 'geometry-fns'

function crossOverExperiments(
	lx1: number, 
	ly1: number, 
	lx2: number, 
	ly2: number, 
	x1: number, 
	y1: number
): number

distanceBetween

求两个坐标点之间的距离

import { distanceBetween } from 'geometry-fns'

function distanceBetween(
  x1: number,
  y1: number, 
  x2: number, 
  y2: number
): number

isConvexPolygon

判断是否凸多边形，传入一个数组包含多个点的x和y坐标组成的多边形

import { isConvexPolygon } from 'geometry-fns'

function isConvexPolygon(polygon: number[]): boolean

lineCrossedQuadrangle

判断直线是否穿过四边形，如果穿过就返回两条直线的坐标数组

import { lineCrossedQuadrangle } from 'geometry-fns'

function lineCrossedQuadrangle(
  line: number[], 
  quadrangle: number[]
): [number[], number[]] | null

orthocenterOf

求多边形的重心

import { orthocenterOf } from 'geometry-fns'

function orthocenterOf(polygon: number[]): number[] | null