Compartilhar um caso semelhante de projeto da minha própria empresa, realizado por Polar (coordenada polar ou chamado sistema de coordenadas retangulares planas) e Bar (gráfico de barras) em Echarts
O efeito geral é este
Consulte o efeito de https://antv-f2.gitee.io/zh/examples/gallery/fitness-ring no AntV , mas percebi com o Echarts.
Primeiro , preciso apresentar o Echarts.js e recomendo fazer o download com o npm: npm instale echarts
ou use hospedagem cdn diretamente: https://www.bootcdn.cn/echarts/
Código-fonte: https://gitee.com/DieHunter/myCode/tree/master/Echart/AppleWatch O
seguinte é o código completo:
HTML ：
<!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>
* {
margin: 0;
padding: 0;
}
.chart_box {
width: 300px;
height: 300px;
margin: 100px auto 0;
background: #000;
}
</style>
<script src="./echarts.js"></script>
</head>
<body>
<div id="chart_box" class="chart_box"></div>
<script type="module">
import MyChart from './MyChart.js'
MyChart.getInstance(echarts,chart_box).createChart()//初始化入口函数
</script>
</body>
</html>JS ：
export default class MyChart {
constructor(_echart, _ele) {
this.timeTickId = null //定时器id
this.timer = 1.5 //更新数据频率
this.option = null //当前echarts实例的属性
this._echart = _echart //引入Echarts
this._ele = _ele //案例的父元素
this.myChart = null //当前echarts实例
this.colorList = ['#14A5AB', '#88D903', '#E90B3A'] //上层环背景
this.bgList = ['#183C3D', '#324214', '#40131D'] //下层环背景
this.maxCount = 100 //圆环最大值,即转一圈的值
}
static getInstance() { //单例模式
if (!MyChart._instance) {
Object.defineProperty(MyChart, "_instance", {
value: new MyChart(...arguments)
})
}
return MyChart._instance;
}
createChart = () => {
this.disposeChart() //创建前初始化chart实例，若有，则销毁
this.myChart = this._echart.init(this._ele)
this.option = {
angleAxis: {
show: false, //隐藏角度轴（圆心角）
max: this.maxCount,
startAngle: 90, //极坐标从第一象限开始，即平面直角坐标系,用时钟理解，0就是三点钟方向，这里我们从12点钟方向开始，也就是3点钟方向加90度
splitLine: {
show: false //隐藏分隔线
},
},
barMaxWidth: 50, //设置圆环最大宽度
radiusAxis: {
show: false, //隐藏径向轴（半径）
type: 'category',
data: ['A', 'B', 'C'] //传入每条圆环的径向值
},
polar: {
radius: [30, 150] //总体的最小半径，最大半径
},
series: [{ //上层的圆环
type: 'bar',
data: [1, 2, 3], //初始值
coordinateSystem: 'polar', //设置类型为极坐标
roundCap: true, //柱状图末端呈现圆角
itemStyle: { //设置每一个圆环的颜色
color: (params) => {
return this.colorList[params.dataIndex]
}
},
animationEasing: 'bounceOut', //初始动画
barGap: '-100%', //柱间距离,用来将上下两种圆环重合
z: 200, //圆环层级，和zindex相似
},
{ //下层的圆环
type: 'bar',
data: [this.maxCount, this.maxCount, this.maxCount],
coordinateSystem: 'polar',
roundCap: true,
itemStyle: { //设置每一个圆环的颜色
color: (params) => {
return this.bgList[params.dataIndex]
}
},
z: 100,
barGap: '-100%', //柱间距离,用来将上下两种圆环重合
}
]
};
this.timeTick() //定时器入口
}
setOption = () => { //随机数刷新数据
if (this.option) {
this.option.series[0].data = this.option.series[0].data.map(item => {
return Math.random() * this.maxCount
})
}
this.myChart.setOption(this.option, true)
}
disposeChart = () => { //初始化chart实例
if (this.myChart) {
this.myChart.dispose()
this.myChart = null
this.option = null
}
}
timeTick = () => { //定时器,最好用延时加递归，如果用setInterval，容易造成堵塞
if (this.timeTickId) {
clearTimeout(this.timeTickId)
this.timeTickId = 0
}
this.setOption()
this.timeTickId = setTimeout(this.timeTick, 1000 * this.timer || 5000)
}
}