css 扇形动画

最新推荐文章于 2024-08-29 21:33:27 发布

原创最新推荐文章于 2024-08-29 21:33:27 发布 · 502 阅读

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这段代码展示了如何使用CSS关键帧动画（@keyframes）创建一个扇形展开和闭合的效果。通过调整div的transform属性，实现了四个部分（.a, .b, .c, .d）的旋转和倾斜，从而形成一个完整的扇形视觉效果。动画的延迟和时长使得各个部分依次显示和消失，营造出扇子开合的动态感。

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图示：

代码：

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>扇形</title>
    <style>
        @keyframes bAn{
            0%{
                transform: rotate(0deg) skewY(0deg);
            }
            99%{
                transform: rotate(-179deg) skewY(0deg);
            }
            100%{
                transform: rotate(-180deg) skewY(0deg);
                visibility: hidden;
            }
        }

        @keyframes dAn{
            0%{
                transform: rotate(0deg) skewY(0deg);
            }
            99%{
                transform: rotate(-89deg) skewY(0deg);
            }
            100%{
                transform: rotate(-90deg) skewY(0deg);
                visibility: hidden;
            }
        }

        @keyframes cAn{
            0%{
                transform: rotate(0deg) skewY(0deg);
            }
            99%{
                transform: rotate(0deg) skewY(-89deg);
            }
            100%{
                transform: rotate(0deg) skewY(-90deg);
                visibility: hidden;
            }
        }

        .a {
            width: 400px;
            height: 400px;
            background-color: seagreen;
            border-radius: 50%;
            overflow: hidden;
            position: relative;
        }

        .b {
            position: absolute;
            left: 0;
            top: 0;
            width: 200px;
            height: 400px;
            transform: rotate(0deg) skewY(0deg);
            transform-origin: 100% 50%;
            background-color: steelblue;
            animation: bAn 2s;
            animation-timing-function: linear;
            animation-fill-mode: forwards;
        }

        .c {
            position: absolute;
            left: 200px;
            top: 0;
            width: 200px;
            height: 200px;
            transform: rotate(0deg) skewY(0deg);
            transform-origin: 0% 50%;
            background-color: steelblue;
            animation: cAn 1s;
            animation-delay:3s;
            animation-timing-function: linear;
            animation-fill-mode: forwards;
        }

        .d {
            position: absolute;
            left: 200px;
            top: 200px;
            width: 200px;
            height: 200px;
            transform: rotate(0deg) skewY(0deg);
            transform-origin: 0% 0%;
            background-color: steelblue;
            animation: dAn 1s;
            animation-delay:2s;
            animation-timing-function: linear;
            animation-fill-mode: forwards;
        }
    </style>
</head>

<body>
    <div class="a">
        <div class="b"></div>
        <div class="c"></div>
        <div class="d"></div>
    </div>
</body>

</html>