72 lines
1.5 KiB
JavaScript
72 lines
1.5 KiB
JavaScript
const Utils = require('./utils')
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const BLOCK_CHAR = {
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WW: ' ',
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WB: '▄',
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BB: '█',
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BW: '▀'
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}
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const INVERTED_BLOCK_CHAR = {
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BB: ' ',
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BW: '▄',
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WW: '█',
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WB: '▀'
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}
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function getBlockChar (top, bottom, blocks) {
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if (top && bottom) return blocks.BB
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if (top && !bottom) return blocks.BW
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if (!top && bottom) return blocks.WB
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return blocks.WW
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}
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exports.render = function (qrData, options, cb) {
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const opts = Utils.getOptions(options)
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let blocks = BLOCK_CHAR
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if (opts.color.dark.hex === '#ffffff' || opts.color.light.hex === '#000000') {
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blocks = INVERTED_BLOCK_CHAR
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}
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const size = qrData.modules.size
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const data = qrData.modules.data
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let output = ''
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let hMargin = Array(size + (opts.margin * 2) + 1).join(blocks.WW)
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hMargin = Array((opts.margin / 2) + 1).join(hMargin + '\n')
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const vMargin = Array(opts.margin + 1).join(blocks.WW)
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output += hMargin
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for (let i = 0; i < size; i += 2) {
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output += vMargin
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for (let j = 0; j < size; j++) {
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const topModule = data[i * size + j]
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const bottomModule = data[(i + 1) * size + j]
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output += getBlockChar(topModule, bottomModule, blocks)
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}
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output += vMargin + '\n'
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}
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output += hMargin.slice(0, -1)
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if (typeof cb === 'function') {
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cb(null, output)
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}
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return output
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}
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exports.renderToFile = function renderToFile (path, qrData, options, cb) {
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if (typeof cb === 'undefined') {
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cb = options
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options = undefined
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}
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const fs = require('fs')
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const utf8 = exports.render(qrData, options)
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fs.writeFile(path, utf8, cb)
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}
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