js canvas实现红包照片效果

前端之家收集整理的这篇文章主要介绍了js canvas实现红包照片效果前端之家小编觉得挺不错的,现在分享给大家,也给大家做个参考。

今天跟着学习了一个制作红包照片类似功能的demo,很有意思,所以在这里分享代码给大家,可以直接使用。

先贴出效果图大家看一下:

点击重置后会以随机一个点为圆心生成半径为50px的圆,然后显示清晰的图像;

点击显示后会全部显示清晰的图像;

功能虽然很少,但是很有意思不是吗,而且做好了适配可以在不同分辨率大小的设备上都可以玩。

只需要js+css+html就可以实现,不过需要引入jquery

下面po出完整代码

demo.html:

Meta http-equiv="Content-Type" content="text/html; charset=utf-8"> Canvas玩儿转红包照片@H_<a href="/tag/403/" target="_blank" class="keywords">403</a>_21@ <script src="http://cdn.bootcss.com/jquery/2.2.0/jquery.min.js" type="text/javascript"></script> <link href="img.css" rel="external nofollow" rel="stylesheet" type="text/css" /> <<a href="/tag/Meta/" target="_blank" class="keywords">Meta</a> name="viewport" content=" height = device-height,width = device-width,initial-scale = 1.0,minimum-scale = 1.0,maximum-scale = 1.0,user-scalable = no"/> </head> <body> <p><div id="blur-div"><br /> <img src="images/1.jpg" id="blur-image"><br /> <canvas id="canvas"></p> </canvas> <a href="javascript:reset()" rel="external nofollow" class="button" id="reset-button"> 重置 </a> <a href="javascript:show()" rel="external nofollow" class="button" id="show-button"> 显示 </a> </div> <p><script type="text/javascript" src="img.js"></script></p> </body> </html></pre> </div> <p>img.css: </p> <div class="jb51code"> <pre class="brush:css;"> *{ margin: 0 0; padding: 0 0; } <h1>blur-div{</h1> <p>/<em> width: 800px;<br /> height: 500px;</em>/<br /> margin: 0 auto;<br /> position: relative;<br /> /<em>超过部分隐藏</em>/<br /> overflow: hidden;<br /> }</p> <h1>blur-image {</h1> <p>display: block;<br /> /<em>width: 800px;<br /> height: 500px;</em>/<br /> margin: 0 auto;</p> <p>/<em>滤镜 模糊 括号内值越大,就越模糊</em>/<br /> filter: blur(20px);<br /> -webkit-filter:blur(20px);<br /> -moz-filter:blur(20px);<br /> -ms-filter:blur(20px);<br /> -o-filter:blur(20px);</p> <p>position: absolute;<br /> left: 0px;<br /> top: 0px;</p> <p>/<em>表示在z轴上的值</em>/<br /> z-index: 0;<br /> }</p> <h1>canvas{</h1> <p>display: block;<br /> margin: 0 auto;</p> <p>position: absolute;<br /> left: 0px;<br /> top: 0px;</p> <p>z-index: 100;</p> <p>} </p> <p>.button{<br /> display: block;<br /> position: absolute;<br /> z-index: 200;</p> <p>width: 100px;<br /> height: 30px;</p> <p>color: white;<br /> text-decoration: none;<br /> text-align: center;<br /> line-height: 30px;</p> <p>border-radius: 5px;</p> <p>}</p> <h1>reset-button{</h1> <p>left: 50px;<br /> bottom: 20px;<br /> background-color: #058;<br /> }</p> <h1>reset-button:hover{</h1> <p>background-color: #047;<br /> }</p> <h1>show-button{</h1> <p>right: 50px;<br /> bottom: 20px;<br /> background-color: #085;<br /> }</p> <h1>show-button:hover{</h1> <p>background-color: #074;<br /> }</pre></p> </div> <p>img.js:</p> <div class="jb51code"> <pre class="brush:js;"> var canvasWidth = window.innerWidth var canvasHeight = window.innerHeight <p>var canvas = document.getElementById("canvas")<br /> var context = canvas.getContext("2d")</p> <p>canvas.width=canvasWidth<br /> canvas.height=canvasHeight<br /> var radius = 50</p> <p>var image = new Image()<br /> var clippingRegion = {x:-1,y:-1,r:radius}</p> <p>var leftMargin = 0,topMargin=0</p> <p>var a;</p> <p>image.src = "images/1.jpg"<br /> image.onload = function(e){</p> <p>$("#blur-div").css("width",canvasWidth + "px")<br /> $("#blur-div").css("height",canvasHeight + "px")</p> <p>$("#blur-image").css("width",image.width + "px")<br /> $("#blur-image").css("height",image.height + "px")</p> <p>leftMargin = (image.width - canvas.width) / 2<br /> topMargin = (image.height - canvas.height) / 2</p> <p>$("#blur-image").css("top","-" + topMargin + "px")<br /> $("#blur-image").css("left","-" + leftMargin + "px")</p> <p>initCanvas()<br /> }</p> <p>function initCanvas(){</p> <p>clearInterval(a)<br /> clippingRegion = {x:Math.random()<em>(canvas.width-2</em>radius)+radius,y:Math.random()<em>(canvas.height-2</em>radius)+radius,r:radius}<br /> console.log(canvas.width);<br /> console.log(canvas.height);<br /> clippingRegion.r = 0;<br /> var id = setInterval(<br /> function(){<br /> clippingRegion.r += 2;<br /> if(clippingRegion.r > 50){<br /> clearInterval(id)<br /> }<br /> draw(image,clippingRegion)<br /> },30<br /> )</p> <p>}</p> <p>function setClippingRegion(clippingRegion){<br /> /<em>创建剪辑区域的路径</em>/<br /> context.beginPath()<br /> /<em>第六个参数表示是顺时针还是逆时针绘制</em>/<br /> context.arc(clippingRegion.x,clippingRegion.y,clippingRegion.r,Math.PI<em>2,false)<br /> /</em>希望路径是个剪辑区域<a href="/tag/diaoyong/" target="_blank" class="keywords">调用</a>此<a href="/tag/fangfa/" target="_blank" class="keywords">方法</a>*/<br /> context.clip()<br /> }</p> <p>function draw(image,clippingRegion){</p> <p>/<em>每次绘制之前,对canvas的<a href="/tag/neirong/" target="_blank" class="keywords">内容</a>进行清空</em>/<br /> context.clearRect(0,canvas.width,canvas.height)<br /> /<em>存储canvas的当前状态</em>/<br /> context.save()<br /> /<em>剪辑出一个圆形的区域</em>/<br /> setClippingRegion(clippingRegion)<br /> /<em>开始画</em>/<br /> //context.drawImage(image,0)<br /> /<em>leftMargin,topMargin,canvas.height表示image剪出这么大<br /> 0,canvas.height 表示canvas的大小<br /> </em>/<br /> context.drawImage(image,leftMargin,canvas.height,canvas.height)<br /> /<em>canvas的状态恢复</em>/<br /> context.restore()<br /> }</p> <p>function reset(){<br /> initCanvas();<br /> }</p> 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