2d-array-rotation 中文文档教程

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2d-array-rotation

构建状态Coverage Status

在给定二维数组(即 Array < code>Arrays) 顺时针旋转 90、180 或 270 度。 在其他可能的应用中,可能对——比如说——操纵游戏片段或精灵有用。 作为 ES6 兼容模块提供。

函数

附加说明

  • Can handle both square (e.g. 3x3) and rectangular (e.g. 3x5, 4x8) two-dimensional arrays. Just make sure that the rows are all the same length; results may be inconsistent otherwise.
  • Source arrays are not directly modified.
  • Values within rows are re-indexed directly from the source array, not copied or cloned. Object types and references will remain consistent.

Installation

npm install 2d-array-rotation

Usage

Importing

Via ES6-style imports

import {rotate, rotate90} from "2d-array-rotation";

Via standard node.js requires

const rotate = require('2d-array-rotation').rotate;
const rotate90 = require('2d-array-rotation').rotate90;
// and so on

Functions

rotate90(arr)

将给定的二维数组顺时针旋转 90 度。

let i = [
    [ 1, 2, 3 ],
    [ 4, 5, 6 ],
    [ 7, 8, 9 ]
];
let o = rotate90(i);
/**
 * Result: [
 * [ 7, 4, 1 ],
 * [ 8, 5, 2 ],
 * [ 9, 6, 3 ]
 * ]
 */
Parameters
  • arr (Array): a two-dimensional array
Returns

一个新的二维 Array 表示输入的旋转形式。

rotate180(arr)

将给定的二维数组顺时针旋转 180 度。

let i = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9],
    [10, 11, 12]
];
let o = rotate180(i);
/**
 * Result: [
 * [12, 11, 10],
 * [ 9,  8,  7],
 * [ 6,  5,  4],
 * [ 3,  2,  1]
 * ]
 */
Parameters
  • arr (Array): a two-dimensional array
Returns

一个新的二维 Array 表示输入的旋转形式。

rotate270(arr)

将给定的二维数组顺时针旋转 270 度。

let i = [
    [ 1, 2, 3 ],
    [ 4, 5, 6 ],
    [ 7, 8, 9 ]
];
let o = rotate270(i);
/**
 * Result: [
 * [ 3, 6, 9 ],
 * [ 2, 5, 8 ],
 * [ 1, 4, 7 ]
 * ]
 */
Parameters
  • arr (Array): a two-dimensional array
Returns

一个新的二维 Array 表示输入的旋转形式。

rotate(arr, deg)

将给定的二维数组顺时针旋转给定的度数。 调用 rotate90rotate180rotate270,具体取决于输入。

let i = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9],
    [10, 11, 12],
    [13, 14, 15]
];
let o = rotate(i, 90);
/**
 * Result: [
 * [13, 10, 7, 4, 1],
 * [14, 11, 8, 5, 2],
 * [15, 12, 9, 6, 3]
 * ]
 */
// note that this function can also handle negative degree values...
let o2 = rotate(i, -270); // returns same as above
// ... and degree values higher than 360
let o3 = rotate(i, 450); // returns same as above
Parameters
  • arr (Array): A two-dimensional array.
  • deg (Number): Number of degrees to rotate. Must be a multiple of 90, or an error will be thrown.
Returns

一个新的二维 Array 表示输入的旋转形式; 或者,如果被告知旋转 0 度或 360 度,原始 arr 本身没有任何修改。

hflip(arr)

额外功能——水平翻转数组。

let input = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9],
    [10, 11, 12]
];
let o = hflip(input);
/**
 * Result: [
 * [3, 2, 1],
 * [6, 5, 4],
 * [9, 8, 7],
 * [12, 11, 10],
 * ]
 */

vflip(arr)

额外功能——垂直翻转数组。

let input = [
    [ 1, 2, 3 ],
    [ 4, 5, 6 ],
    [ 7, 8, 9 ]
];
let o = vflip(input);
/**
 * Result: [
 * [ 7, 8, 9 ],
 * [ 4, 5, 6 ],
 * [ 1, 2, 3 ]
 * ]
 */

Testing

npm test

Release History

  • 2.1.0
    • updated dependencies
  • 2.1.1
    • updated dependencies

Credits and Licensing

Jon Stout 创建。 根据 MIT 许可证 获得许可。

Special Thanks To

你/Reddit 上的 Epyo。

2d-array-rotation

Build StatusCoverage Status

A collection of functions to rotate the values within a given two-dimensional array (i.e. an Array of Arrays) clockwise by 90, 180 or 270 degrees. Potentially useful for -- say -- manipulating game pieces or sprites, among other possible applications. Provided as an ES6-compatible module.

Functions

Additional Notes

  • Can handle both square (e.g. 3x3) and rectangular (e.g. 3x5, 4x8) two-dimensional arrays. Just make sure that the rows are all the same length; results may be inconsistent otherwise.
  • Source arrays are not directly modified.
  • Values within rows are re-indexed directly from the source array, not copied or cloned. Object types and references will remain consistent.

Installation

npm install 2d-array-rotation

Usage

Importing

Via ES6-style imports

import {rotate, rotate90} from "2d-array-rotation";

Via standard node.js requires

const rotate = require('2d-array-rotation').rotate;
const rotate90 = require('2d-array-rotation').rotate90;
// and so on

Functions

rotate90(arr)

Rotates the given two-dimensional array 90 degrees clockwise.

let i = [
    [ 1, 2, 3 ],
    [ 4, 5, 6 ],
    [ 7, 8, 9 ]
];
let o = rotate90(i);
/**
 * Result: [
 * [ 7, 4, 1 ],
 * [ 8, 5, 2 ],
 * [ 9, 6, 3 ]
 * ]
 */
Parameters
  • arr (Array): a two-dimensional array
Returns

A new two-dimensional Array that represents the rotated form of the input.

rotate180(arr)

Rotates the given two-dimensional array 180 degrees clockwise.

let i = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9],
    [10, 11, 12]
];
let o = rotate180(i);
/**
 * Result: [
 * [12, 11, 10],
 * [ 9,  8,  7],
 * [ 6,  5,  4],
 * [ 3,  2,  1]
 * ]
 */
Parameters
  • arr (Array): a two-dimensional array
Returns

A new two-dimensional Array that represents the rotated form of the input.

rotate270(arr)

Rotates the given two-dimensional array 270 degrees clockwise.

let i = [
    [ 1, 2, 3 ],
    [ 4, 5, 6 ],
    [ 7, 8, 9 ]
];
let o = rotate270(i);
/**
 * Result: [
 * [ 3, 6, 9 ],
 * [ 2, 5, 8 ],
 * [ 1, 4, 7 ]
 * ]
 */
Parameters
  • arr (Array): a two-dimensional array
Returns

A new two-dimensional Array that represents the rotated form of the input.

rotate(arr, deg)

Rotates the given two-dimensional array by the given number of degrees clockwise. Calls rotate90, rotate180, or rotate270, depending on the input.

let i = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9],
    [10, 11, 12],
    [13, 14, 15]
];
let o = rotate(i, 90);
/**
 * Result: [
 * [13, 10, 7, 4, 1],
 * [14, 11, 8, 5, 2],
 * [15, 12, 9, 6, 3]
 * ]
 */
// note that this function can also handle negative degree values...
let o2 = rotate(i, -270); // returns same as above
// ... and degree values higher than 360
let o3 = rotate(i, 450); // returns same as above
Parameters
  • arr (Array): A two-dimensional array.
  • deg (Number): Number of degrees to rotate. Must be a multiple of 90, or an error will be thrown.
Returns

A new two-dimensional Array that represents the rotated form of the input; or, if told to rotate by 0 or 360 degrees, the original arr itself without any modifications.

hflip(arr)

Bonus function -- flips the array horizontally.

let input = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9],
    [10, 11, 12]
];
let o = hflip(input);
/**
 * Result: [
 * [3, 2, 1],
 * [6, 5, 4],
 * [9, 8, 7],
 * [12, 11, 10],
 * ]
 */

vflip(arr)

Bonus function -- flips the array vertically.

let input = [
    [ 1, 2, 3 ],
    [ 4, 5, 6 ],
    [ 7, 8, 9 ]
];
let o = vflip(input);
/**
 * Result: [
 * [ 7, 8, 9 ],
 * [ 4, 5, 6 ],
 * [ 1, 2, 3 ]
 * ]
 */

Testing

npm test

Release History

  • 2.1.0
    • updated dependencies
  • 2.1.1
    • updated dependencies

Credits and Licensing

Created by Jon Stout. Licensed under the MIT license.

Special Thanks To

u/Epyo on Reddit.

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