/
githubmirror
/
react-beautiful-dnd
Обзор
Документация
Войти
/
githubmirror
/
react-beautiful-dnd
Код
Запросы
0
Пакеты
0
Релизы
0
Аналитика
Безопасность
master
src/state/position.js
58 строк
2 KB
Alex Reardon
next (wip) (#823)
12 ноя 2018, 02:31
Не верифицирован
12 ноя 2018, 02:31
3dbb704
Код
Авторство
О чём код?
// @flow import { type Position } from 'css-box-model'; export const origin: Position = { x: 0, y: 0 }; export const add = (point1: Position, point2: Position): Position => ({ x: point1.x + point2.x, y: point1.y + point2.y, }); export const subtract = (point1: Position, point2: Position): Position => ({ x: point1.x - point2.x, y: point1.y - point2.y, }); export const isEqual = (point1: Position, point2: Position): boolean => point1.x === point2.x && point1.y === point2.y; export const negate = (point: Position): Position => ({ // if the value is already 0, do not return -0 x: point.x !== 0 ? -point.x : 0, y: point.y !== 0 ? -point.y : 0, }); // Allows you to build a position from values. // Really useful when working with the Axis type // patch('x', 5) = { x: 5, y: 0 } // patch('y', 5, 1) = { x: 1, y: 5 } export const patch = ( line: 'x' | 'y', value: number, otherValue?: number = 0, ): Position => ({ // set the value of 'x', or 'y' [line]: value, // set the value of the other line [line === 'x' ? 'y' : 'x']: otherValue, }); // Returns the distance between two points // https://www.mathsisfun.com/algebra/distance-2-points.html export const distance = (point1: Position, point2: Position): number => Math.sqrt( Math.pow(point2.x - point1.x, 2) + Math.pow(point2.y - point1.y, 2), ); // When given a list of points, it finds the smallest distance to any point export const closest = (target: Position, points: Position[]): number => Math.min(...points.map((point: Position) => distance(target, point))); // used to apply any function to both values of a point // eg: const floor = apply(Math.floor)(point); export const apply = (fn: (value: number) => number) => ( point: Position, ): Position => ({ x: fn(point.x), y: fn(point.y), });