• 用Html5实现网页大头贴 效果
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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。


 

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