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[refactor] use opentype.js directly with a 3d font
[add] header
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,88 +1 @@ | ||
| 'use strict'; | ||
|
|
||
| const textToSVG = require('text-to-svg').loadSync(); | ||
| const random = require('./random'); | ||
|
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| const generateBackground = function (width, height) { | ||
| const seed = random.int(0, 10); | ||
|
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| return `<filter id="n" x="0" y="0"> | ||
| <feTurbulence baseFrequency=".7,.07" seed="${seed}"/> | ||
| <feColorMatrix type="luminanceToAlpha"/> | ||
| </filter> | ||
| <rect width="${width}" height="${height}" filter="url(#n)" opacity="0.2"/>`; | ||
| }; | ||
|
|
||
| const getLineNoise = function (lv, width, height) { | ||
| const noiseString = []; | ||
| var i = -1; | ||
|
|
||
| while (++i < lv) { | ||
| var start = random.int(5, 25) + ' ' + | ||
| random.int(10, height - 10); | ||
| var end = random.int(width - 25, width - 5) + ' ' + | ||
| random.int(10, height - 10); | ||
| var mid1 = random.int((width / 2) - 25, (width / 2) + 25) + ' ' + | ||
| random.int(10, height - 10); | ||
| var mid2 = random.int((width / 2) - 25, (width / 2) + 25) + ' ' + | ||
| random.int(10, height - 10); | ||
| var color = random.greyColor(); | ||
| noiseString.push(`<path d="M${start} C${mid1},${mid2},${end}" | ||
| stroke="${color}" fill="transparent"/>`); | ||
| } | ||
|
|
||
| return noiseString.join(''); | ||
| }; | ||
|
|
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| const getSVGOptions = function (x, width, height) { | ||
| return { | ||
| x: x, y: height / 2, fontSize: Math.floor(height * 0.72), | ||
| anchor: 'center middle', | ||
| attributes: {fill: 'red', stroke: 'black'} | ||
| }; | ||
| }; | ||
|
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||
| const getText = function (text, width, height) { | ||
| const len = text.length; | ||
| const spacing = (width - 2) / (len + 1); | ||
| var i = -1; | ||
| var out = []; | ||
|
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| while (++i < len) { | ||
| var charPath = textToSVG.getD(text[i], | ||
| getSVGOptions((i + 1) * spacing, width, height)); | ||
| // randomly scale it to 95% - 105%, skew | ||
| var randomMatrix = random.matrix(); | ||
| var color = random.greyColor(0, 4); | ||
| out.push(`<path fill="${color}" d="${charPath}" | ||
| transform="matrix(${randomMatrix})"/>`); | ||
| } | ||
|
|
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| return out.join(''); | ||
| }; | ||
|
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| const createCaptcha = function (options) { | ||
| if (typeof options === 'string') { | ||
| options = {text: options}; | ||
| } | ||
| options = options || {}; | ||
| const width = options.width || 150; | ||
| const height = options.height || 50; | ||
| const noiseLv = options.noise || 3; | ||
| const text = options.text || random.captchaText(); | ||
|
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| const lineNoise = getLineNoise(noiseLv, width, height); | ||
| const bg = generateBackground(width, height); | ||
| const textPath = getText(text, width, height); | ||
| const xml = `<svg xmlns="http://www.w3.org/2000/svg" | ||
| width="${width}" height="${height}"> | ||
| ${textPath} | ||
| ${lineNoise} | ||
| ${bg} | ||
| </svg>`; | ||
|
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| return xml.replace(/[\t]/g, '').replace(/\n(\W)/g, '$1'); | ||
| }; | ||
|
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| module.exports = createCaptcha; | ||
| module.exports.randomText = random.captchaText; | ||
| module.exports = require('./lib'); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| 'use strict'; | ||
|
|
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| const textToPath = require('./text-to-path'); | ||
| const random = require('./random'); | ||
|
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| const generateBackground = function (width, height) { | ||
| const seed = random.int(0, 10); | ||
|
|
||
| return `<filter id="n" x="0" y="0"> | ||
| <feTurbulence baseFrequency=".7,.07" seed="${seed}"/> | ||
| <feColorMatrix type="luminanceToAlpha"/> | ||
| </filter> | ||
| <rect width="${width}" height="${height}" filter="url(#n)" opacity="0.2"/>`; | ||
| }; | ||
|
|
||
| const getLineNoise = function (lv, width, height) { | ||
| const noiseString = []; | ||
| var i = -1; | ||
|
|
||
| while (++i < lv) { | ||
| var start = random.int(5, 25) + ' ' + | ||
| random.int(10, height - 10); | ||
| var end = random.int(width - 25, width - 5) + ' ' + | ||
| random.int(10, height - 10); | ||
| var mid1 = random.int((width / 2) - 25, (width / 2) + 25) + ' ' + | ||
| random.int(10, height - 10); | ||
| var mid2 = random.int((width / 2) - 25, (width / 2) + 25) + ' ' + | ||
| random.int(10, height - 10); | ||
| var color = random.greyColor(); | ||
| noiseString.push(`<path d="M${start} C${mid1},${mid2},${end}" | ||
| stroke="${color}" fill="transparent"/>`); | ||
| } | ||
|
|
||
| return noiseString.join(''); | ||
| }; | ||
|
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| const getSVGOptions = function (x, height) { | ||
| return { | ||
| x: x, y: height / 2, fontSize: Math.floor(height * 0.98) | ||
| }; | ||
| }; | ||
|
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| const getText = function (text, width, height, options) { | ||
| const len = text.length; | ||
| const spacing = (width - 2) / (len + 1); | ||
| var i = -1; | ||
| var out = []; | ||
|
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| while (++i < len) { | ||
| var charPath = textToPath(text[i], | ||
| getSVGOptions((i + 1) * spacing, height)); | ||
| // randomly scale it to 95% - 105%, skew | ||
| var transform = options.transform ? | ||
| `transform="matrix(${random.matrix()})"` : ''; | ||
| var color = random.greyColor(0, 4); | ||
| out.push(`<path fill="${color}" d="${charPath}" | ||
| ${transform}/>`); | ||
| } | ||
|
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| return out.join(''); | ||
| }; | ||
|
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| const createCaptcha = function (options) { | ||
| if (typeof options === 'string') { | ||
| options = {text: options}; | ||
| } | ||
| options = options || {}; | ||
| const width = options.width || 150; | ||
| const height = options.height || 50; | ||
| const noiseLv = options.noise || 1; | ||
| const text = options.text || random.captchaText(); | ||
|
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| const lineNoise = getLineNoise(noiseLv, width, height); | ||
| const bg = options.bg ? generateBackground(width, height) : ''; | ||
| const textPath = getText(text, width, height, options); | ||
| const xml = `<svg xmlns="http://www.w3.org/2000/svg" | ||
| width="${width}" height="${height}"> | ||
| ${textPath} | ||
| ${lineNoise} | ||
| ${bg} | ||
| </svg>`; | ||
|
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| return xml.replace(/[\t]/g, '').replace(/\n(\W)/g, '$1'); | ||
| }; | ||
|
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| module.exports = createCaptcha; | ||
| module.exports.randomText = random.captchaText; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| const path = require('path'); | ||
| const opentype = require('opentype.js'); | ||
|
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| const fontPath = path.join(__dirname, '../fonts/Comismsh.ttf'); | ||
| const font = opentype.loadSync(fontPath); | ||
|
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| var getWidth = function getWidth(text, fontScale) { | ||
| var width = 0; | ||
| var glyph; | ||
|
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| const glyphs = font.stringToGlyphs(text); | ||
|
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| for (var i = 0; i < glyphs.length; i++) { | ||
| glyph = glyphs[i]; | ||
|
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| if (glyph.advanceWidth) { | ||
| width += glyph.advanceWidth * fontScale; | ||
| } | ||
|
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| if (i < glyphs.length - 1) { | ||
| width += font.getKerningValue(glyph, glyphs[i + 1]) * fontScale; | ||
| } | ||
| } | ||
|
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| return width; | ||
| }; | ||
|
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| var getHeight = function getHeight(fontScale) { | ||
| return (font.ascender + font.descender) * fontScale; | ||
| }; | ||
|
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| module.exports = function getPath(text, options) { | ||
| options = options === undefined ? {} : options; | ||
| const fontSize = options.fontSize || 72; | ||
| const fontScale = 1 / font.unitsPerEm * fontSize; | ||
|
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| const width = getWidth(text, fontScale); | ||
| const left = (options.x || 0) - (width / 2); | ||
|
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| const height = getHeight(fontScale); | ||
| const baseline = (options.y || 0) + (height / 2); | ||
| const path = font.getPath(text, left, baseline, fontSize, {kerning: true}); | ||
|
|
||
| return path.toPathData(); | ||
| }; |
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