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使用纯 CSS + Animation + conic-gradient 实现一个环形图。
饼图的实现思路和环形图一样，去掉中间的圆形遮盖 after 伪类元素即可。
一、构建基础样式
构建圆形节点和中间的遮盖元素。
<style>body {background-color: rgb(130, 226, 255);}.circle {top: 160px;left: 160px;width: 300px;aspect-ratio: 1;border: 1px solid white;border-radius: 50%;position: relative;&::after {content: "";position: absolute;top: 7px;left: 7px;width: 286px;height: 286px;border-radius: 50%;background: rgb(0, 183, 255);display: block;box-sizing: border-box;}}
</style><body><div class="circle"></div>
</body>
二、设置环形、饼图
设置锥形渐变，设置三个颜色（transparent，white，transparent），方便后边通过动画动态调整
.circle {...background: conic-gradient(transparent 0 0, white 0 90deg, transparent 90deg 360deg);&::after {...}
}
三、添加动画
添加动画前，将 background 重置一下
.circle {...background: conic-gradient(transparent 0 0, white 0 0, transparent 0 360deg);&::after {...}
}
然后添加动画
.circle {...animation: rotated 10s linear infinite;&::after {...}
}
@keyframes rotated {0% {background: conic-gradient(transparent 0 0, white 0 0, transparent 0 360deg);}12% {background: conic-gradient(transparent 0 0, white 0 90deg, transparent 90deg 360deg);}25% {background: conic-gradient(transparent 0 90deg, white 90deg 90deg, transparent 90deg 360deg);}37% {background: conic-gradient(transparent 0 90deg, white 90deg 180deg, transparent 180deg 360deg);}50% {background: conic-gradient(transparent 0 180deg, white 180deg 180deg, transparent 180deg 360deg);}62% {background: conic-gradient(transparent 0 180deg, white 180deg 270deg, transparent 270deg 360deg);}75% {background: conic-gradient(transparent 0 270deg, white 270deg 270deg, transparent 270deg 360deg);}87% {background: conic-gradient(transparent 0 270deg, white 270deg 360deg, transparent 360deg 360deg);}100% {background: conic-gradient(transparent 0 360deg, white 360deg 360deg, transparent 360deg 360deg);}
}
可以看到，为渐变gradient的元素设置animation、transition是不会有过渡的效果。这是由于gradient属性并不像width这类型的属性一样，无法通过gradient的变化实现过渡效果。
四、解决过渡不生效的问题
使用 @property 自定义属性，在 gradient 各个颜色的起始、结束角度上使用。
重新调整 @keyframes 中变化的属性，不改变 gradient，而是改变我们自定义的 angle 属性。
CSS变量和@property-CSDN博客
<style>body {...}@property --angle1 {syntax: '<angle>';initial-value: 0deg;inherits: false;}@property --angle2 {syntax: '<angle>';initial-value: 0deg;inherits: false;}.circle {...background: conic-gradient(transparent 0 var(--angle1), white var(--angle1) var(--angle2), transparent var(--angle2) 360deg);...&::after {...}}@keyframes rotated {0% {--angle1: 0deg;--angle2: 0deg;/* background: conic-gradient(transparent 0 0, white 0 0, transparent 0 360deg); */}12% {--angle1: 0deg;--angle2: 90deg;/* background: conic-gradient(transparent 0 0, white 0 90deg, transparent 90deg 360deg); */}25% {--angle1: 90deg;--angle2: 90deg;/* background: conic-gradient(transparent 0 90deg, white 90deg 90deg, transparent 90deg 360deg); */}37% {--angle1: 90deg;--angle2: 180deg;/* background: conic-gradient(transparent 0 90deg, white 90deg 180deg, transparent 180deg 360deg); */}50% {--angle1: 180deg;--angle2: 180deg;/* background: conic-gradient(transparent 0 180deg, white 180deg 180deg, transparent 180deg 360deg); */}62% {--angle1: 180deg;--angle2: 270deg;/* background: conic-gradient(transparent 0 180deg, white 180deg 270deg, transparent 270deg 360deg); */}75% {--angle1: 270deg;--angle2: 270deg;/* background: conic-gradient(transparent 0 270deg, white 270deg 270deg, transparent 270deg 360deg); */}87% {--angle1: 270deg;--angle2: 360deg;/* background: conic-gradient(transparent 0 270deg, white 270deg 360deg, transparent 360deg 360deg); */}100% {--angle1: 360deg;--angle2: 360deg;/* background: conic-gradient(transparent 0 360deg, white 360deg 360deg, transparent 360deg 360deg); */}}
</style>
完整代码
<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>Document</title><style>body {background-color: rgb(130, 226, 255);}@property --angle1 {syntax: "<angle>";initial-value: 0deg;inherits: false;}@property --angle2 {syntax: "<angle>";initial-value: 0deg;inherits: false;}.circle {top: 160px;left: 160px;width: 300px;aspect-ratio: 1;border-radius: 50%;position: relative;background: conic-gradient(transparent 0 var(--angle1), white var(--angle1) var(--angle2), transparent var(--angle2) 360deg);animation: rotated 10s linear infinite;&::after {content: "";position: absolute;top: 7px;left: 7px;width: 286px;height: 286px;border-radius: 50%;background: rgb(0, 183, 255);display: block;box-sizing: border-box;}}@keyframes rotated {0% {--angle1: 0deg;--angle2: 0deg;/* background: conic-gradient(transparent 0 0, white 0 0, transparent 0 360deg); */}12% {--angle1: 0deg;--angle2: 90deg;/* background: conic-gradient(transparent 0 0, white 0 90deg, transparent 90deg 360deg); */}25% {--angle1: 90deg;--angle2: 90deg;/* background: conic-gradient(transparent 0 90deg, white 90deg 90deg, transparent 90deg 360deg); */}37% {--angle1: 90deg;--angle2: 180deg;/* background: conic-gradient(transparent 0 90deg, white 90deg 180deg, transparent 180deg 360deg); */}50% {--angle1: 180deg;--angle2: 180deg;/* background: conic-gradient(transparent 0 180deg, white 180deg 180deg, transparent 180deg 360deg); */}62% {--angle1: 180deg;--angle2: 270deg;/* background: conic-gradient(transparent 0 180deg, white 180deg 270deg, transparent 270deg 360deg); */}75% {--angle1: 270deg;--angle2: 270deg;/* background: conic-gradient(transparent 0 270deg, white 270deg 270deg, transparent 270deg 360deg); */}87% {--angle1: 270deg;--angle2: 360deg;/* background: conic-gradient(transparent 0 270deg, white 270deg 360deg, transparent 360deg 360deg); */}100% {--angle1: 360deg;--angle2: 360deg;/* background: conic-gradient(transparent 0 360deg, white 360deg 360deg, transparent 360deg 360deg); */}}</style></head><body><div class="circle"></div></body>
</html>
饼图例子
<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>Document</title><style>body {background-color: rgb(130, 226, 255);}@property --angle {syntax: "<angle>";initial-value: 0deg;inherits: false;}.circle {top: 160px;left: 160px;width: 300px;aspect-ratio: 1;border: 1px solid white;border-radius: 50%;position: relative;background: conic-gradient(white 0 var(--angle), transparent var(--angle) 360deg);transition: --angle 0.5s linear;&:hover {--angle: 360deg;}}</style></head><body><div class="circle"></div></body>
</html>
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