#Captcha PNG generator
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A numeric captcha generator for Node.js
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##Features
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* Only generate numeric captcha PNG image
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* Build-in fonts
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* Characters up and down, left and right limits, random displacement
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* Full JavaScript
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##Examples
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```javascript
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/**
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* Captcha PNG img generator
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* @Author: George Chan
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* @Email: gchan@21cn.com
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* @Version: 1.0
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* @Date: 2013-08-18
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* @license http://www.opensource.org/licenses/bsd-license.php BSD License
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*/
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var http = require('http');
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var captchapng = require('captchapng');
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http.createServer(function (request, response) {
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if(request.url == '/captcha.png') {
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var p = new captchapng(80,30,parseInt(Math.random()*9000+1000)); // width,height,numeric captcha
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p.color(0, 0, 0, 0); // First color: background (red, green, blue, alpha)
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p.color(80, 80, 80, 255); // Second color: paint (red, green, blue, alpha)
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var img = p.getBase64();
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var imgbase64 = new Buffer(img,'base64');
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response.writeHead(200, {
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'Content-Type': 'image/png'
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});
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response.end(imgbase64);
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} else response.end('');
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}).listen(8181);
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console.log('Web server started.\n http:\\\\127.0.0.1:8181\\captcha.png');
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```
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