css3实现扁平化风格APP应用图标时钟动画

今天无聊写了一个扁平化风格APP时钟动态图标。其外观（表盘、刻度、指针）都使用css来绘制，然后再通过javascript来获取当前时间并且让时钟动起来。有了这个优美的动态时钟，我再也不要看手表了，哈哈。

一、HTML结构代码

结构比较简单：表盘（icon-clock）、内圆（clock）、刻度（ol）以及时针（hour）、分针（min）、秒针（sec）。具体如下：

<div class="icon-large icon-clock">
<div class="clock">
<ol>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ol>
<div id="hour"></div>
<div id="min"></div>
<div id="sec"></div>
</div>
</div>

　　

二、CSS绘制时钟样式

通过css3的变换以及旋转等属性来绘制出漂亮的扁平化时钟。

html, body {
height: 100%;
background: #ffd740;
position: relative;
}
.icon-large {
width: 220px;
height: 220px;
border-radius: 38px;
margin:auto auto 60px auto;
position: relative;
}
.icon-clock {
overflow: hidden;
background: #000;
}
.clock {
width: 192px;
height: 192px;
border-radius: 50%;
background: #f1f1f1;
position: absolute;
top: 50%;
left: 50%;
-webkit-transform: translate(-50%, -50%);
-ms-transform: translate(-50%, -50%);
transform: translate(-50%, -50%);
}
.clock ol {
list-style-type: none;
width: 100%;
height: 100%;
position: relative;
margin: 0;
padding: 0;
}
.clock ol li {
counter-increment: labelCounter;
position: absolute;
font-size: 1.25em;
}
.clock ol li:before {
font-family: 'Helvetica';
content: counter(labelCounter) "";
}
.clock ol li:nth-child(1) {
right: 55px;
top: 20px;
}
.clock ol li:nth-child(2) {
right: 25px;
top: 50px;
}
.clock ol li:nth-child(3) {
right: 12px;
top: 85px;
}
.clock ol li:nth-child(4) {
right: 25px;
top: 125px;
}
.clock ol li:nth-child(5) {
right: 55px;
top: 150px;
}
.clock ol li:nth-child(6) {
right: 90px;
top: 160px;
}
.clock ol li:nth-child(7) {
right: 125px;
top: 150px;
}
.clock ol li:nth-child(8) {
right: 155px;
top: 125px;
}
.clock ol li:nth-child(9) {
right: 165px;
top: 85px;
}
.clock ol li:nth-child(10) {
right: 150px;
top: 50px;
}
.clock ol li:nth-child(11) {
right: 120px;
top: 20px;
}
.clock ol li:nth-child(12) {
right: 85px;
top: 10px;
}
@-webkit-keyframes spin {
100% {
-webkit-transform: rotate(360deg);
transform: rotate(360deg);
}
}
@keyframes spin {
100% {
-webkit-transform: rotate(360deg);
transform: rotate(360deg);
}
}
#hour {
width: 14px;
height: 14px;
border-radius: 50%;
background: #303030;
position: absolute;
top: 50%;
left: 50%;
margin-top: -7px;
margin-left: -7px;
}
#hour:before, #hour:after {
content: "";
display: block;
position: absolute;
}
#hour:before {
width: 8px;
height: 65px;
border-radius: 4px;
background: #303030;
position: absolute;
bottom: 2px;
left: 50%;
-webkit-transform: translate(-50%, 0);
-ms-transform: translate(-50%, 0);
transform: translate(-50%, 0);
}
#min {
width: 0;
height: 0;
border-radius: 50%;
background: #303030;
position: absolute;
top: 50%;
left: 50%;
}
#min:before, #min:after {
content: "";
display: block;
position: absolute;
}
#min:before {
width: 6px;
height: 90px;
border-radius: 4px;
background: #303030;
position: absolute;
bottom: 2px;
left: 50%;
-webkit-transform: translate(-50%, 0);
-ms-transform: translate(-50%, 0);
transform: translate(-50%, 0);
}
#sec {
width: 4px;
height: 4px;
border-radius: 50%;
background: #dd3e1c;
border: 2px solid #e13e1b;
position: absolute;
top: 50%;
left: 50%;
margin-top: -4px;
margin-left: -4px;
}
#sec:before, #sec:after {
content: "";
display: block;
position: absolute;
}
#sec:before {
width: 2px;
height: 105px;
border-radius: 4px;
background: #e13e1b;
position: absolute;
bottom: -12px;
left: 50%;
-webkit-transform: translate(-50%, 0);
-ms-transform: translate(-50%, 0);
transform: translate(-50%, 0);
}

　　

三、JavaScript让时钟动起来

到这里基本完成了时钟效果，最后我们通过javascript来获取当前时间，然后让时钟动起来。参考代码如下：

//use requestAnimationFrame for smoothness (shimmed with setTimeout fallback)
window.requestAnimFrame = (function(){
return  window.requestAnimationFrame       ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame    ||
function( callback ){
window.setTimeout(callback, 1000 / 60);
};
})();

//initialize the clock in a self-invoking function
(function clock(){
var hour = document.getElementById("hour"),
min = document.getElementById("min"),
sec = document.getElementById("sec");
//set up a loop
(function loop(){
requestAnimFrame(loop);
draw();
})();
//position the hands
function draw(){
var now = new Date(),//now
then = new Date(now.getFullYear(),now.getMonth(),now.getDate(),0,0,0),//midnight
diffInMil = (now.getTime() - then.getTime()),// difference in milliseconds
h = (diffInMil/(1000*60*60)),//hours
m = (h*60),//minutes
s = (m*60);//seconds
//rotate the hands accordingly
sec.style.webkitTransform = "rotate(" + (s * 6) + "deg)";
hour.style.webkitTransform = "rotate(" + (h * 30 + (h / 2)) + "deg)";
min.style.webkitTransform = "rotate(" + (m * 6) + "deg)";
}
})();

　　查看演示：http://www.datouwang.com/jiaoben/405.html

好了，今天的分享就到这里，如果你们也有不错的、好玩的东西也可以跟我一起分享哦。