本篇文章给大家带来的内容是关于如何使用css和gsap实现树枝发芽的loader动画(附源码) ,有一定的参考价值,有需要的朋友可以参考一下,希望对你有所帮助。
效果预览
源代码下载https://github.com/comehope/front-end-daily-challenges
代码解读定义 dom,容器包含 2 个元素,branch 代表枝,leaves 代表叶,叶有 6 个子元素,代表 6 个叶片:
<figure class="sapling"> <div class="branch"></div> <div class="leaves"> <span></span> <span></span> <span></span> <span></span> <span></span> <span></span> </div></figure>
居中显示:
body { margin: 0; height: 100vh; display: flex; align-items: center; justify-content: center; background-color: black;}
定义容器尺寸,并设置子元素水平居中:
.sapling { position: relative; width: 5em; height: 17.5em; font-size: 10px; display: flex; justify-content: center;}
画出树枝:
.branch { position: absolute; width: 0.2em; height: inherit; border-radius: 25%; background: burlywood;}
定义树叶容器,设置为叶片在垂直方向均匀分布,并且从下到上排列:
.leaves { position: absolute; width: inherit; height: 15em; top: 1em; display: flex; flex-direction: column-reverse;}
设置叶片的尺寸和和背景颜色:
.leaves span { width: 2.5em; height: 2.5em; background-color: limegreen;}
设置左右叶片的各自样式:
.leaves span:nth-child(odd) { border-bottom-left-radius: 3em; border-top-right-radius: 3em; transform-origin: right bottom; align-self: flex-start;}.leaves span:nth-child(even) { border-bottom-right-radius: 3em; border-top-left-radius: 3em; transform-origin: left bottom; align-self: flex-end;}
至此,静态效果绘制完成,接下来开始写动画脚本。
引入 gsap 库:
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/2.0.2/tweenmax.min.js"></script>
声明一个时间线对象:
let animation = new timelinemax();
增加树枝的入场动画效果,并为这个动画设置一个标签 branch:
animation.from('.branch', 4, {scaley: 0, ease: power1.easeout}, 'branch');
增加树叶的入场动画效果,它的参数中有 3 个 0.5,从左到右的含义分别是动画时长、多个叶片动画的间隔时长、相对 branch 标签动画的延迟时间:
animation.from('.branch', 4, {scaley: 0, ease: power1.easeout}, 'branch') .staggerfrom('.leaves span', 0.5, {scale: 0, ease: power1.easeout}, 0.5, 0.5, 'branch');
增加叶片变黄的动画效果:
animation.from('.branch', 4, {scaley: 0, ease: power1.easeout}, 'branch') .staggerfrom('.leaves span', 0.5, {scale: 0, ease: power1.easeout}, 0.5, 0.5, 'branch') .to(['.branch', '.leaves span'], 3, {backgroundcolor: 'yellow'});
增加淡出效果:
animation.from('.branch', 4, {scaley: 0, ease: power1.easeout}, 'branch') .staggerfrom('.leaves span', 0.5, {scale: 0, ease: power1.easeout}, 0.5, 0.5, 'branch') .to(['.branch', '.leaves span'], 3, {backgroundcolor: 'yellow'}) .to(['.branch', '.leaves span'], 1, {autoalpha: 0});
修改声明时间线的代码,使动画重复播放:
let animation = new timelinemax({repeat: -1, repeatdelay: 0.5});
大功告成!
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