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>
body部分定义了这个页面的布局，具体的css就不再将了，主要由两个div组成，一个拍照的div与修改的div，里面定义了一些href连接，主要说的是script部分，这部分就是实现拍照的主要代码，我在拍照里定义了video标签，使得你可以通过摄像头看见自己动的时候电脑里的头像也在动，而对于拍照的话，你只需让video上的流pause就可以了。
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();
});2.五秒后延迟拍照：（index.html）
document.getElementById("autophotograph").addEventListener("click",function(){
video.play();
timer = setTimeout(function(){
video.pause();
},5000);
});
3. 重拍：（index.html）
document.getElementById("rephotograph").addEventListener("click", function() {
clearTimeout(timer);
video.play();
});
4.修改：（index.html）
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>6.下载到本地(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);
});
7.分享到本站(index.js):ps把图片流上传到sae的stoarge里。
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：
<?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。
转载请注明:我的原博客链接http://blog.saymagic.cn/blog.php?id=4