Echarts实战案例代码(33)：饼状图半圆实现方法

解决方案：按照饼图的实际写法，将所有项作为180°上的饼图，所有相的和作为180°下的半圆不显示即可。

let list = [{
    name: "张三",
    value: "9"
}, {
    name: "李四",
    value: "50"
}, {
    name: "王五",
    value: "30"
}, {
    name: "马六",
    value: "9"
}, {
    name: "__other",
    value: "0"
}]

let sum = 0;
list.map((item, index) => {
    sum += parseInt(item.value)
})

list[list.length - 1].value = sum
let colorList = ['#0E7CE2', '#FF8352', '#E271DE', '#F8456B', "rgba(0,0,0,0)"]

Echarts option:

option = {
    tooltip: {},
    color: colorList,
    series: [{
        name: "",
        type: "pie",
        hoverAnimation: false,
        startAngle: -180,
        radius: ["60%", "100%"],
        center: ["50%", "70%"],
        label: {
            normal: {
                show: true,
                position: "inner", //显示在扇形上
                formatter: "{b}", //显示内容
                textStyle: {
                    color: "white", // 改变标示文字的颜色
                    fontSize: 12, //文字大小
                    fontWeight: "bold",
                },
            },
        },
        labelLine: {
            normal: {
                show: false,
            },
        },
        data: list,
        itemStyle: {
            emphasis: {
                shadowBlur: 10,
                shadowOffsetX: 0,
                shadowColor: "rgba(0, 0, 0, 0.5)",
            },
        },
    }, ],
}

存在的问题： 下面180°的图形，只是将图形通过rgba(0,0,0,0)隐藏了，在实际场景中需要调整 center: ["50%", "70%"]来控制具体的显示方式。

Done!