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ascii-art-coordinate-grid

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Readme

ascii-art-coordinate-grid

Read a 2D coordinate grid from an ASCII-art-like string.

When writing tests for modules that take some list of 2d coordinates as input (e.g. a polygon or an embedding of a graph), I often find it hard to make my input human readable. My data mostly looks somewhat like this:

const polygon = [
    [2, 2],
    [0, 0],
    [2, -2],
    [-3, -3],
    [-3, 0],
    [-3, 3]
]

As you can see, it's pretty hard to tell how this polygon looks like, and it gets even more complicated when you have multiple inputs. This is why I created this small module, which allows you to do the following instead:

const readGrid = require('ascii-art-coordinate-grid')
const coordinateGrid = `
. . . . . + . . . . .
. . F . . + . . . . .
. . . . . + . A . . .
. . . . . + . . . . .
+ + E + + B + + + + +
. . . . . + . . . . .
. . . . . + . C . . .
. . D . . + . . . . .
. . . . . + . . . . .
`

const points = readGrid(coordinateGrid)
const polygon = [points.A, points.B, points.C, points.D, points.E, points.F]

See #usage for more details.

Installation

npm install ascii-art-coordinate-grid

Usage

const readGrid = require('ascii-art-coordinate-grid')

const gridString = `
. . # . . . .
. . A . . . .
. . # . . . .
. . # . B . .
C # # # # # #
. . # . . . 🇪🇸
`
const options = {
    axisCellCharacter: '#' // defaults to `+`
    normalCellCharacter: '.' // defaults to `.`
    transformCoordinates: ([x, y]) => [x, y] // defaults to the identity function, is applied to all points
}

const points = readGrid(gridString, options)
// {
//     A: [0, 3],
//     B: [2, 1],
//     C: [-2, 0],
//     '🇪🇸': [4, -1]
// }

const polygon = [points.A, points.B, points.C, points['🇪🇸']]

Note that point names can be any non-whitespace human perceived characters, so even emoji 🇫🇷 or other combined characters like 나.

Contributing

If you found a bug or want to propose a feature, feel free to visit the issues page.