基于Html5的网页大头贴

jopen 10年前

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>  
</div> </div> 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();        });  
</div> </div> 2.五秒后延迟拍照:(index.html)
    document.getElementById("autophotograph").addEventListener("click",function(){            video.play();            timer = setTimeout(function(){                  video.pause();            },5000);        });  
</div> </div>
3. 重拍:(index.html)
</div> </div>
    document.getElementById("rephotograph").addEventListener("click", function() {            clearTimeout(timer);            video.play();        });  

4.修改:(index.html)
</div> </div>
    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)
</div> </div>
    $("#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>
    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>
    <?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