Html5技術越來越侵蝕著這個互連網，不得不承認，Html5所帶來的改變還是很大的，一次偶然的機會，找到了Html5調用電腦網路攝影機的API，於是想到了做一個網頁版大頭貼來實現拍照與簡單修改的功能，初期的版本還比較簡單，大家可以看一下效果。saymagic.sinaapp.com/takephoto/。(！)
好的，那接下來我就將介紹下這個的實現過程，代碼已在GitHub上開源，後面會給出，先聲明一下，該網站運行在sae平台上，所以圖片的上傳與儲存在用sae的storage，所以下載下來若不是在sae上部署，就會有一些功能用不了，即使用sae的話也需要自己建立storage等，所以copy黨們注意一下。
這個的代碼量還是不少的，首先，看一下主介面的代碼吧，
<!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) { // Standardnavigator.getUserMedia(videoObj, function(stream) {video.src = stream;video.play();}, errBack);} else if(navigator.webkitGetUserMedia) { // WebKit-prefixednavigator.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秒後自動拍攝</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網站</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">下載到本地</a><a id="share" class="normal_button">分享到本網站</a><a href="paint/show.php" class="to_register" target="_blank"> 查看他人分享 </a><a href="#tologin" class="to_register"> 重新拍攝 </a> <a href="http://www.sae.sina.com.cn">sae網站</a></div> </div> </div> </div> </section> </div> </body> <script type="text/javascript" src="index.js"></script> <script></script></html>body部分定義了這個頁面的布局，具體的css就不再將了，主要由兩個div組成，一個拍照的div與修改的div，裡面定義了一些href串連，主要說的是script部分，這部分就是實現拍照的主要代碼，我在拍照裡定義了video標籤，使得你可以通過網路攝影機看見自己動的時候電腦裡的頭像也在動，而對於拍照的話，你只需讓video上的流pause就可以了。
1.拍照：（index.html）
document.getElementById("snap").addEventListener("click", function() {clearTimeout(timer);video.pause();});2.五秒後延遲拍照：（index.html）
document.getElementById("autophotograph").addEventListener("click",function(){video.play();timer = setTimeout(function(){video.pause();},5000);});
document.getElementById("rephotograph").addEventListener("click", function() {clearTimeout(timer);video.play();});
document.getElementById("change").addEventListener("click", function() {context.drawImage(video, 0, 0, 440, 330);});
啊哦~~link串連==
<a href="http://www.sae.sina.com.cn">sae網站</a>6.下載到本地(index.js)
$("#download").click(function() { var myCanvas = document.getElementById("canvas"); var image = myCanvas.toDataURL("image/png").replace("image/png", "image/octet-stream"); // window.location.href=image; var filename = 'paint_' + (new Date()).getTime() + '.png'; //saveFile(image, filename); var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a'); save_link.href = image; save_link.download = filename; var event = document.createEvent('MouseEvents'); event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null); // save_link.dispatchEvent(event); });
document.getElementById("share").onclick=function(){ //Ajax提交資料 var xhr=new XMLHttpRequest; xhr.open("POST","upload.php",true); xhr.onreadystatechange=function(){ if(xhr.readyState!=4)return; }; //從canvas中擷取DataURL並發送 xhr.send(canvas.toDataURL()); alert("分享成功!");};
這個就是一個串連到paint/show.php頁面，但是產生這個頁面還是有些難度，如果使用本地檔案來儲存的話可以遍曆圖片檔案下的所有圖片，如果想做進階一點的話就可以實現動態載入，這個是遍曆sae的一個stoarge上的所有圖片，代碼如下：
<?php$fileTypes = array('jpg','jpeg','gif','png');$width = 200;$height = 200;$pageTitle = "Pictures"; // ************************************************************* $s = new SaeStorage();$domain = 'takephoto';//我剛建立的domain的名稱$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>
最後，GitHub的。https://github.com/saymagic/takephoto。有什麼問題歡迎提出，若有改進，也歡迎大家多多開源。
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