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纯CSS3实现动画圆弧进度条 Pure css radial progress bar

Pure css radial progress bar example

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代码如下:

<div class="wrapper" data-anim="base wrapper">
<div class="circle" data-anim="base left"></div>
<div class="circle" data-anim="base right"></div>
</div>

首先定义基本样式:

.wrapper {
width: 100px; /* Set the size of the progress bar */
height: 100px;
position: absolute; /* Enable clipping */
clip: rect(0px, 100px, 100px, 50px); /* Hide half of the progress bar */
}
/* Set the sizes of the elements that make up the progress bar */
.circle {
width: 80px;
height: 80px;
border: 10px solid green;
border-radius: 50px;
position: absolute;
clip: rect(0px, 50px, 100px, 0px);
}

接着是动画规则:

/* Using the data attributes for the animation selectors. */
/* Base settings for all animated elements */
div[data-anim~=base] {
-webkit-animation-iteration-count: 1; /* Only run once */
-webkit-animation-fill-mode: forwards; /* Hold the last keyframe */
-webkit-animation-timing-function:linear; /* Linear animation */
}

.wrapper[data-anim~=wrapper] {
-webkit-animation-duration: 0.01s; /* Complete keyframes asap */
-webkit-animation-delay: 3s; /* Wait half of the animation */
-webkit-animation-name: close-wrapper; /* Keyframes name */
}

.circle[data-anim~=left] {
-webkit-animation-duration: 6s; /* Full animation time */
-webkit-animation-name: left-spin;
}

.circle[data-anim~=right] {
-webkit-animation-duration: 3s; /* Half animation time */
-webkit-animation-name: right-spin;
}

最后是动画帧:

/* Rotate the right side of the progress bar from 0 to 180 degrees */
@-webkit-keyframes right-spin {
from {
-webkit-transform: rotate(0deg);
}
to {
-webkit-transform: rotate(180deg);
}
}
/* Rotate the left side of the progress bar from 0 to 360 degrees */
@-webkit-keyframes left-spin {
from {
-webkit-transform: rotate(0deg);
}
to {
-webkit-transform: rotate(360deg);
}
}
/* Set the wrapper clip to auto, effectively removing the clip */
@-webkit-keyframes close-wrapper {
to {
clip: rect(auto, auto, auto, auto);
}
}

操作原理:

首先:是定义三个动画,第一个是最外层,让他只显示一半,然后运行3s,同时右边运行3s,从0到180度。

接着:到了180度之后,释放外层的显示一半,让他自动显示其他。然后右边的停止动画并停在那里。

最后:左边的在原来的基础(跟右边一样运行3s,同样转过180度)再继续转动180度。

网友评论1

  1. 沙发
    妞妞:

    (⊙o⊙)看不懂

    2015-10-25 4:13 PM

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