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CSS3动画制作的简单示例_html/css_WEB-ITnose

Jun 24, 2016 am 11:37 AM

CSS3 大大强化了制作动画的能力,但是如果要做出图案比较复杂的动画,选择 GIF 依然是一个不错的选择。今天给大家介绍一个使用 CSS animation 配合雪碧图(CSS sprite)来制作动画的方法,可以做出类似于 GIF 动画的效果。
CSS3 Animation steps函数

首先看看,CSS3 animation的兼容性。可以看到基本上主流浏览器都支持了 animation 属性,chrome、safari、opera和移动端的浏览器带上前缀就可以支持。

利用雪碧图来制作动画使用了 CSS3 Animation 里面的一个重要的函数 steps。

animation 本身是一个复合的属性,它包含了 animation-name,animation-timing-function,animation-iteration-count,animation-direction,animation-play-state,animation-fill-mode 六个属性。

steps 就是属于 animation-timing-function 中的一个函数。

animation-timing-function 平时我们用的比较多的是默认的一些动画曲线值 ease、ease-in 等等。而 steps 则可以由我们控制动画被分成多少个部分进行。

steps(n,[start|end]) 传入一到两?个参数,第一个参数意思是把动画分成 n 等分,然后动画就会平均地运行。第二个参赛默认值是 start 表示从动画的开头开始运行,相反,end 就表示从动画的结尾开始运行。

因此,我们利用雪碧图和 steps 函数制作动画的原理就是,雪碧图包含了动画图片的每一帧,然后利用 steps 函数确定固定时间内动画运行的部分等于动画的帧数,从而实现动画效果。
动画实例

用猥琐的兔斯基做例子?( ̄? ̄")?

首先我们要切图,把动画的每一帧切成这样的图:

切图如果大家不想折腾,推荐在线合并雪碧图的工具。

然后写 keyframes

CSS Code复制内容到剪贴板

@-webkit-keyframes tuski {       0% {           background-position:0;       }       100% {           background-position: -576px 0;       }   }   @-moz-keyframes tuski {       0% {           background-position:0;       }       100% {           background-position: -576px 0;       }   }   @keyframes tuski {       0% {           background-position:0;       }       100% {           background-position: -576px 0;       }   }  
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调用动画

CSS Code复制内容到剪贴板

#tuski {       -webkit-animation: tuski .5s steps(12) infinite;       -moz-animation: tuski .5s steps(12) infinite;       animation: tuski .5s steps(12) infinite;   }  
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  • 与 GIF 相比,这种动画可以让我们手动调整动画运行的速度。

    点这里看完整的代码。

    大功告成。

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