效果图
原理剖析
1.先完成这样一个会旋转半圆（这个很简单吧）。
2.overflow: hidden;
在这个半圆所在的地方加上一个包容块。
3.在中间定位一个白色的圆形做遮挡。
4.接着以同样的方式完成另一半圆。
5.使用animate配合时间完成衔接。
其他逻辑可能需要你通过角度进行 js 编码。
源码
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>环形进度条</title>
<style>
.wrapper {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
width: 4em;
height: 4em;
margin: auto;
}
.container {
position: absolute;
top: 0;
bottom: 0;
width: 2em;
overflow: hidden;
}
.halfCir {
width: 2em;
height: 4em;
background: red;
}
.container1 {
left: 2em;
}
.container1 .halfCir {
left: 0;
border-radius: 0 4em 4em 0;
transform-origin: 0 50%;
animation: halfCir1 4s infinite linear;
}
.container2 {
left: 0;
}
.container2 .halfCir {
border-radius: 4em 0 0 4em;
transform-origin: 2em 2em;
animation: halfCir2 4s infinite linear;
}
@keyframes halfCir1 {
50%, 100% {
transform: rotateZ(180deg);
}
}
@keyframes halfCir2 {
0%, 50% {
transform: rotateZ(0);
}
100% {
transform: rotateZ(180deg);
}
}
.wrapper::after {
position: absolute;
top: 0.5em;
left: 0.5em;
width: 3em;
height: 3em;
background: #fff;
border-radius: 50%;
content: "";
}
.cir {
position: absolute;
top: 0;
right: 0;
left: 0;
width: 0.5em;
height: 0.5em;
margin: auto;
background: red;
border-radius: 50%;
}
.cir2 {
transform-origin: 50% 2em;
animation: cir2 4s infinite linear;
}
@keyframes cir2 {
100% {
transform: rotateZ(360deg);
}
}
</style>
</head>
<body>
<div class="wrapper">
<div class="container container1">
<div class="halfCir"></div>
</div>
<div class="container container2">
<div class="halfCir"></div>
</div>
<div class="cir cir1"></div>
<div class="cir cir2"></div>
</div>
</body>
</html>
Vue 组件版
// index.vue
<cirle-progess
:circleDiam="100"
:circleColor="'#ddd'"
:progressSize="10"
:progressColor="'#ffaa00'"
:coverColor="'#fff'"
:text="'25%'"
:textColor="'#333'"
:textSize="28"
:value="25"
:cssUnit="'px'"
></circle-progess> // CircleProgess.vue
<template>
<view :style="circle">
<view :style="[circleBlock, circleBlockLeft]">
<view :style="[circleBlockProgress, circleBlockProgressLeft]">
<view :style="[circleBlockProgressRadius, circleBlockProgressRadiusLeft]"></view>
</view>
</view>
<view :style="[circleBlock, circleBlockRight]">
<view :style="[circleBlockProgress, circleBlockProgressRight]">
<view :style="[circleBlockProgressRadius, circleBlockProgressRadiusRight]"></view>
</view>
</view>
<view :style="circleCover">{{ text }}</view>
</view>
</template> <script>
export default {
name: 'CircleProgess',
props: {
circleDiam: { // 环形圆的直径
type: Number,
default: 100
},
circleColor: { // 无进度条区域的颜色
type: String,
default: '#fff'
},
progressSize: { // 进度条的粗细
type: Number,
default: 10
},
progressColor: { // 进度条的颜色
type: String,
default: '#409EFF'
},
coverColor: { // 遮盖圆的颜色
type: String,
default: '#fff'
},
text: { // 中心文字
type: String,
default: ''
},
textSize: { // 中心文字大小
type: Number,
default: 16
},
textColor: { // 中心文字颜色
type: String,
default: '#333'
},
value: { // 百分比数值
type: Number,
default: 60
},
cssUnit: { // css单位
type: String,
default: 'px'
}
},
computed: {
circle() {
return {
position: 'relative',
width: this.circleDiam + this.cssUnit,
height: this.circleDiam + this.cssUnit,
backgroundColor: this.circleColor,
borderRadius: '50%',
overflow: 'hidden'
}
},
circleBlock() {
return {
position: 'absolute',
width: this.circleDiam / 2 + this.cssUnit,
height: this.circleDiam + this.cssUnit,
overflow: 'hidden'
}
},
circleBlockLeft() {
return {
left: 0
}
},
circleBlockRight() {
return {
right: 0
}
},
circleBlockProgress() {
return {
position: 'absolute',
width: this.circleDiam / 2 + this.cssUnit,
height: this.circleDiam + this.cssUnit
}
},
circleBlockProgressLeft() {
const val = this.value > 50 ? -180 + (this.value - 50) * 3.6 : -180
return {
backgroundColor: this.progressColor,
transformOrigin: '100% 50%',
transform: 'rotate(' + val + 'deg)'
}
},
circleBlockProgressRight() {
const val = this.value > 50 ? 0 : -180 + (this.value * 3.6)
return {
backgroundColor: this.progressColor,
transformOrigin: '0% 50%',
transform: 'rotate(' + val + 'deg)'
}
},
circleBlockProgressRadius() {
return {
position: 'absolute',
width: this.progressSize + this.cssUnit,
height: this.progressSize + this.cssUnit,
borderRadius: '50%'
}
},
circleBlockProgressRadiusLeft() {
const backgroundColor = this.value > 50 ? this.progressColor : this.circleColor
const right = this.progressSize / 2
return {
top: 0,
right: '-' + right + this.cssUnit,
backgroundColor: backgroundColor
}
},
circleBlockProgressRadiusRight() {
const backgroundColor = this.value > 0 ? this.progressColor : this.circleColor
const left = this.progressSize / 2
return {
bottom: 0,
left: '-' + left + this.cssUnit,
backgroundColor: backgroundColor
}
},
circleCover() {
return {
position: 'absolute',
top: 0,
right: 0,
bottom: 0,
left: 0,
width: this.circleDiam - this.progressSize * 2 + this.cssUnit,
height: this.circleDiam - this.progressSize * 2 + this.cssUnit,
margin: 'auto',
backgroundColor: this.coverColor,
borderRadius: '50%',
color: this.textColor,
fontSize: this.textSize + this.cssUnit,
textAlign: 'center',
lineHeight: this.circleDiam - this.progressSize * 2 + this.cssUnit,
zIndex: 1
}
}
}
}
</script>