扇形统计图————微信小程序_微信小程序扇形图

const agePie = function (data) {
    const age = data;
    const query = wx.createSelectorQuery("");
    query.select("#agePie").fields({
        node: true,
        size: true
    });
    query.exec(function (res) {
        const canvas = res[0].node;
        // 定义颜色
        const color = ['#8B0000','#4169E1','#D2691E','#228B22','#4B0082','#FF1493','#FFD700',]
        const pie = canvas.getContext('2d');
        const dpr = wx.getSystemInfoSync().pixelRatio;
 
        canvas.width = res[0].width * dpr;
        canvas.height = res[0].height * dpr;
        // 中心点cp
        const cp = {
            x: canvas.width / 2,
            y: canvas.height / 2+150
        };
        // 定义 π
        const p = Math.PI;
        // 年龄区间
        var section = [];
        // 人数总和
        let all = 0;
        age.forEach((item) => {
            all +