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>