generate svg captcha in node.js or express.js. 

generate svg captcha in node.js or express.js

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steambap

svg-captcha

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{{count, number}} commits last two months

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{{count, number}} development dependencies

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{{- packageName}} - npm Package Compare versions

	const fontScale = fontSize / opts.font.unitsPerEm;

	const glyph = opts.font.charToGlyph(ch);

	const width = glyph.advanceWidth ? glyph.advanceWidth * fontScale : 0;

	const top = opts.y - (opts.descender * fontScale);

	const height = (opts.ascender + opts.descender) * fontScale;

	const path = glyph.getPath(left, top, fontSize);

const opts = require('./option-manager').options;

	return Math.round(min + (Math.random() * (max - min)));

const stripCharsFromString = function (string, chars) {

	return string.split('').filter(char => chars.indexOf(char) === -1);

exports.greyColor = function (min, max) {

	const int = randomInt(min, max).toString(16);

exports.captchaText = function (options) {

	const ignoreChars = options.ignoreChars || '';

	let chars = options.charPreset || opts.charPreset;

		chars = stripCharsFromString(chars, ignoreChars);

 * Returns an object that has the following props:

// https://github.com/jquery/jquery-color/blob/master/jquery.color.js#L432

// The idea here is generate color in hsl first and convert that to rgb color

	const saturation = randomInt(60, 80) / 100;

	const bgLightness = bgColor ? getLightness(bgColor) : 1.0;

		minLightness = Math.round(bgLightness * 100) - 45;

		maxLightness = Math.round(bgLightness * 100) - 25;

		minLightness = Math.round(bgLightness * 100) + 25;

		maxLightness = Math.round(bgLightness * 100) + 45;

	const lightness = randomInt(minLightness, maxLightness) / 100;

		lightness + saturation - (lightness * saturation);

	const r = Math.floor(hue2rgb(p, q, hue + (1 / 3)) * 255);

	const g = Math.floor(hue2rgb(p, q, hue) * 255);

	const b = Math.floor(hue2rgb(p, q, hue - (1 / 3)) * 255);

	const c = ((b | g << 8 | r << 16) | 1 << 24).toString(16).slice(1);

			rgbColor[1] + rgbColor[1] + rgbColor[2] + rgbColor[2];

	const hexColor = parseInt(rgbColor, 16);

		return p + (q - p) * ((2 / 3) - h) * 6;

  "description": "generate svg captcha in node.js or express.js",

    "url": "git+https://github.com/steambap/svg-captcha.git"

    "url": "https://github.com/steambap/svg-captcha/issues"

  "homepage": "https://github.com/steambap/svg-captcha#readme",

		@@ -32,3 +32,3 @@ 'use strict';
		let out = '';
		let chars = opts.charPreset;
		let chars = options.charPreset \|\| opts.charPreset;

		@@ -35,0 +35,0 @@ if (ignoreChars) {

		{
		"name": "svg-captcha",
		"version": "1.3.8",
		"version": "1.3.9",
		"description": "generate svg captcha in node.js or express.js",
		@@ -5,0 +5,0 @@ "main": "index.js",

		@@ -37,3 +37,4 @@ 'use strict';

		const top = opts.y - (opts.descender * fontScale);
		const height = (opts.ascender + opts.descender) * fontScale;
		const top = opts.y + (height / 2);
		const path = glyph.getPath(left, top, fontSize);
		@@ -40,0 +41,0 @@ // Randomize path commands

Improved metrics