基于Html5的网页大头贴
Html5技术越来越侵蚀着这个互联网，不得不承认，Html5所带来的改变还是很大的，一次偶然的机会，找到了Html5调用电脑摄像头的API，于是想到了做一个网页版大头贴来实现拍照与简单修改的功能，初期的版本还比较简单，大家可以看一下效果。saymagic.sinaapp.com/takephoto/。(注意，要用Chrome浏览器！！！)
好的，那接下来我就将介绍下这个的实现过程，代码已在GitHub上开源，后面会给出下载地址，先声明一下，该网站运行在sae平台上，所以图片的上传与存储在用sae的storage，所以下载下来若不是在sae上部署，就会有一些功能用不了，即使用sae的话也需要自己新建storage等，所以 copy党们注意一下。
这个的代码量还是不少的，首先，看一下主界面的代码吧，
<!DOCTYPE html> <!--[if lt IE 7 ]> <html lang="en" class="no-js ie6 lt8"> <![endif]--> <!--[if IE 7 ]> <html lang="en" class="no-js ie7 lt8"> <![endif]--> <!--[if IE 8 ]> <html lang="en" class="no-js ie8 lt8"> <![endif]--> <!--[if IE 9 ]> <html lang="en" class="no-js ie9"> <![endif]--> <!--[if (gt IE 9)|!(IE)]><!--> <html lang="en" class="no-js"> <!--<![endif]--> <head> <meta charset="UTF-8" /> <!-- <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> --> <title>Login and Registration Form with HTML5 and CSS3 Demo</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta name="description" content="Login and Registration Form with HTML5 and CSS3" /> <meta name="keywords" content="html5, css3, form, switch, animation, :target, pseudo-class" /> <link rel="stylesheet" type="text/css" href="css/demo.css" /> <link rel="stylesheet" type="text/css" href="css/style2.css" /> <link rel="stylesheet" type="text/css" href="css/animate-custom.css" /> <script type="text/javascript" src="js/jquery-1.8.3.js"></script> <script type="text/javascript" src="js/jquery.popImage.mini.js"></script> <link href="index.css" rel="stylesheet" type="text/css"> <script language="javascript"> window.addEventListener("DOMContentLoaded", function() { var timer; var canvas = document.getElementById("canvas"), context = canvas.getContext("2d"), video = document.getElementById("video"), videoObj = { "video": true }, errBack = function(error) { console.log("Video capture error: ", error.code); }; if(navigator.getUserMedia) { // Standard navigator.getUserMedia(videoObj, function(stream) { video.src = stream; video.play(); }, errBack); } else if(navigator.webkitGetUserMedia) { // WebKit-prefixed navigator.webkitGetUserMedia(videoObj, function(stream){ video.src = window.webkitURL.createObjectURL(stream); video.play(); }, errBack); } document.getElementById("snap").addEventListener("click", function() { clearTimeout(timer); video.pause(); }); document.getElementById("rephotograph").addEventListener("click", function() { clearTimeout(timer); video.play(); }); document.getElementById("autophotograph").addEventListener("click",function(){ video.play(); timer = setTimeout(function(){ video.pause(); },3000); }); document.getElementById("change").addEventListener("click", function() { context.drawImage(video, 0, 0, 440, 330); }); var saveFile = function(data, filename) { var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a'); save_link.href = data; save_link.download = filename; var event = document.createEvent('MouseEvents'); event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null); save_link.dispatchEvent(event); }; document.getElementById("download").addEventListener("click", function() { var myCanvas = document.getElementById("canvas"); var image = myCanvas.toDataURL("image/png").replace("image/png", "image/octet-stream"); var filename = 'paint_' + (new Date()).getTime() + '.png'; saveFile(image,filename); // window.location.href=image; // it will save locally }); }, false); </script> </head> <body> <div class="container" id="container"> <section> <div id="container_demo" > <!-- hidden anchor to stop jump http://www.css3create.com/Astuce-Empecher-le-scroll-avec-l-utilisation-de-target#wrap4 --> <a class="hiddenanchor" id="toregister"></a> <a class="hiddenanchor" id="tologin"></a> <div id="wrapper"> <div id="login" class="animate form"> <h1>自拍一下</h1> <div> <video id="video" width="440" height="330" autoplay></video> </div> <a id="snap" class="normal_button">拍照</a> <a id="autophotograph" class="normal_button">5秒后自动拍摄</a> <a id="rephotograph" class="normal_button">重拍</a> <a href="#toregister" id="change" class="to_register">修改</a> <a href="http://www.sae.sina.com.cn">sae站点</a> </div> <div id="register" class="animate form"> <h1> 修改一下</h1> <canvas id="canvas" name="mypic" width="440" height="330"></canvas> <div id="chooseColor"></div> <div id="chooseSize"></div><br><br> <div> <a id="download" class="normal_button">下载到本地</a> <a id="share" class="normal_button">分享到本网站</a> <a href="paint/show.php" class="to_register" target="_blank"> 查看他人分享 </a> <a href="#tologin" class="to_register"> 重新拍摄 </a> <a href="http://www.sae.sina.com.cn">sae站点</a> </div> </div> </div> </div> </section> </div> </body> <script type="text/javascript" src="index.js"></script> <script> </script> </html> 就可以了，好的，基本原理就是这样，说一下每个连接按钮对应的具体代码。
1.拍照：（index.html）
document.getElementById("snap").addEventListener("click", function() { clearTimeout(timer); video.pause(); }); document.getElementById("autophotograph").addEventListener("click",function(){ video.play(); timer = setTimeout(function(){ video.pause(); },5000); }); 3. 重拍：（index.html）
</div> </div>
4.修改：（index.html）
document.getElementById("rephotograph").addEventListener("click", function() { clearTimeout(timer); video.play(); }); 4.修改：（index.html）
</div> </div>
5.sae站点（index.html）
6.下载到本地(index.js)
document.getElementById("change").addEventListener("click", function() { context.drawImage(video, 0, 0, 440, 330); }); 5.sae站点（index.html）
啊哦~~link连接==
<a href="http://www.sae.sina.com.cn">sae站点</a> </div> </div>
7.分享到本站(index.js):ps把图片流上传到sae的stoarge里。
$("#download").click(function() { var myCanvas = document.getElementById("canvas"); var image = myCanvas.toDataURL("image/png").replace("image/png", "image/octet-stream"); // window.location.href=image; var filename = 'paint_' + (new Date()).getTime() + '.png'; //saveFile(image, filename); var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a'); save_link.href = image; save_link.download = filename; var event = document.createEvent('MouseEvents'); event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null); // save_link.dispatchEvent(event); }); 7.分享到本站(index.js):ps把图片流上传到sae的stoarge里。
</div> </div>
8.查看他人分享：（paint/show.php）
document.getElementById("share").onclick=function(){ //Ajax提交数据 var xhr=new XMLHttpRequest; xhr.open("POST","upload.php",true); xhr.onreadystatechange=function(){ if(xhr.readyState!=4)return; }; //从canvas中获取DataURL并发送 xhr.send(canvas.toDataURL()); alert("分享成功!"); }; 8.查看他人分享：（paint/show.php）
这个就是一个连接到paint/show.php页面，但是生成这个页面还是有些难度，如果使用本地文件来存储的话可以遍历图片文件下的所有图片，如果想做高级一点的话就可以实现动态加载，这个是遍历sae的一个stoarge上的所有图片，代码如下：
</div> </div>
说一下，图片的展开效果用的是popImage，简单却实用的小工具。
<?php $fileTypes = array('jpg','jpeg','gif','png'); $width = 200; $height = 200; $pageTitle = "Pictures"; // ************************************************************* $s = new SaeStorage(); $domain = 'takephoto';//我刚创建的domain的名称 $filelist = $s->getList($domain,"",100); $f = join(',*.', $fileTypes); $f = '*.'.$f; $height += 20; ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html;charset=utf-8" /> <title><?php echo $pageTitle; ?></title> <script type="text/javascript" src="../js/jquery-1.8.3.js"></script> <script type="text/javascript" src="../js/jquery.popImage.mini.js"></script> <link rel="stylesheet" type="text/css" href="../css/popImage.css" /> <style type="text/css"> <!-- * { margin:0; padding:0; } h1 { background:#eee; font-weight:normal; padding:3px 5px; font-size:medium; } ul { margin-top:10px; list-style:none; } ul li { width:<?php echo $width; ?>px; height:<?php echo $height; ?>px; float:left; padding:5px; overflow:hidden; margin-bottom:10px; } ul li span { height:20px; font-size:medium; font-style:italic; } ul li a img { width:<?php echo $width; ?>px; border:dotted 1px #ddd; } } --> </style> </head> <body> <ul> <?php $loop = 1; foreach($filelist as $name) { ?> <li> <span><?php echo $loop; ?></span> <a href="<?php echo $s->getUrl($domain,$name); ?>" target="_blank" rel="gallery" class="image_gall"><img alt="<?php echo $s->getUrl($domain,$name); ?>" src="<?php echo $s->getUrl($domain,$name); ?>" /></a> </li> <?php $loop++; } ?> </ul> <script> $(function(){ $("a.image_gall").popImage(); }) </script> </body> </html> 说一下，图片的展开效果用的是popImage，简单却实用的小工具。
最后，GitHub的下载地址。https://github.com/saymagic/takephoto。有什么问题欢迎提出，若有改进，也欢迎大家多多开源。
来自:http://blog.csdn.net/saymagic/article/details/17782903
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