Vue2 Echarts 3D饼图

npm install echarts -S
npm install echarts-gl -S

/**
 * 绘制3d图
 * @param pieData 总数据
 * @param internalDiameterRatio:透明的空心占比
 * @param distance 视角到主体的距离
 * @param alpha 旋转角度
 * @param pieHeight 立体的高度
 * @param opacity 饼或者环的透明度
 */
const getPie3D = (
    pieData,
    internalDiameterRatio,
    distance,
    alpha,
    pieHeight,
    opacity = 1
) => {
    const series = [];
    let sumValue = 0;
    let startValue = 0;
    let endValue = 0;
    let legendData = [];
    let legendBfb = [];
    const k = 1 - internalDiameterRatio;
    pieData.sort((a, b) => {
        return b.value - a.value;
    });
    // 为每一个饼图数据，生成一个 series-surface 配置
    for (let i = 0; i < pieData.length; i++) {
        sumValue += pieData[i].value;
        const seriesItem = {
            name:
                typeof pieData[i].name === "undefined" ? `series${i}` : pieData[i].name,
            type: "surface",
            parametric: true,
            wireframe: {
                show: false,
            },
            pieData: pieData[i],
            pieStatus: {
                selected: false,
                hovered: false,
                k: k,
            },
            center: ["10%", "50%"],
        };
        if (typeof pieData[i].itemStyle !== "undefined") {
            const itemStyle = {};
            itemStyle.color =
                typeof pieData[i].itemStyle.color !== "undefined"
                    ? pieData[i].itemStyle.color
                    : opacity;
            itemStyle.opacity =
                typeof pieData[i].itemStyle.opacity !== "undefined"
                    ? pieData[i].itemStyle.opacity
                    : opacity;
            seriesItem.itemStyle = itemStyle;
        }
        series.push(seriesItem);
    }

    // 使用上一次遍历时，计算出的数据和 sumValue，调用 getParametricEquation 函数，
    // 向每个 series-surface 传入不同的参数方程 series-surface.parametricEquation，也就是实现每一个扇形。
    legendData = [];
    legendBfb = [];
    for (let i = 0; i < series.length; i++) {
        endValue = startValue + series[i].pieData.value;
        series[i].pieData.startRatio = startValue / sumValue;
        series[i].pieData.endRatio = endValue / sumValue;
        series[i].parametricEquation = getParametricEquation(
            series[i].pieData.startRatio,
            series[i].pieData.endRatio,
            false,
            false,
            k,
            series[i].pieData.value
        );
        startValue = endValue;
        const bfb = fomatFloat(series[i].pieData.value / sumValue, 4);
        legendData.push({
            name: series[i].name,
            value: bfb,
        });
        legendBfb.push({
            name: series[i].name,
            value: bfb,
        });
    }
    const boxHeight = getHeight3D(series, pieHeight); // 通过pieHeight设定3d饼/环的高度，单位是px
    // 准备待返回的配置项，把准备好的 legendData、series 传入。
    const option = {
        legend: {
            show: false,
            data: legendData,
            orient: "vertical",
            left: 10,
            top: 10,
            itemGap: 10,
            textStyle: {
                color: "#A1E2FF",
            },
            icon: "circle",
            formatter: function (param) {
                const item = legendBfb.filter((item) => item.name === param)[0];
                const bfs = fomatFloat(item.value * 100, 2) + "%";
                return `${item.name}  ${bfs}`;
            },
        },
        labelLine: {
            show: true,
            lineStyle: {
                color: "#fff",
            },
        },
        label: {
            show: true,
            position: "outside",
            formatter: "{b} \n{c} {d}%",
        },
        tooltip: {
            backgroundColor: "#033b77",
            borderColor: "#21f2c4",
            textStyle: {
                color: "#fff",
                fontSize: 13,
            },
            formatter: (params) => {
                if (
                    params.seriesName !== "mouseoutSeries" &&
                    params.seriesName !== "信用评价"
                ) {
                    // console.log(option.series,params.seriesName,'option.series[params.seriesIndex].pieData');
                    const bfb = (
                        (option.series[params.seriesIndex].pieData.endRatio -
                            option.series[params.seriesIndex].pieData.startRatio) *
                        100
                    ).toFixed(2);
                    return (
                        `${params.seriesName}
` +
                        `${params.color};">` +
                        `${bfb}%`
                    );
                }
            },
        },
        xAxis3D: {
            min: -1,
            max: 1,
        },
        yAxis3D: {
            min: -1,
            max: 1,
        },
        zAxis3D: {
            min: -1,
            max: 1,
        },
        grid3D: {
            show: false,
            boxHeight: boxHeight, // 圆环的高度
            viewControl: {
                // 3d效果可以放大、旋转等，请自己去查看官方配置
                alpha, // 角度
                distance, // 调整视角到主体的距离，类似调整zoom
                rotateSensitivity: 0, // 设置为0无法旋转
                zoomSensitivity: 0, // 设置为0无法缩放
                panSensitivity: 0, // 设置为0无法平移
                autoRotate: false, // 自动旋转
            },
        },
        series: series,
    };
    return option;
};

/**
 * 生成扇形的曲面参数方程，用于 series-surface.parametricEquation
 */
const getParametricEquation = (
    startRatio,
    endRatio,
    isSelected,
    isHovered,
    k,
    h
) => {
    // 计算
    const midRatio = (startRatio + endRatio) / 2;
    const startRadian = startRatio * Math.PI * 2;
    const endRadian = endRatio * Math.PI * 2;
    const midRadian = midRatio * Math.PI * 2;
    // 如果只有一个扇形，则不实现选中效果。
    if (startRatio === 0 && endRatio === 1) {
        isSelected = false;
    }
    // 通过扇形内径/外径的值，换算出辅助参数 k（默认值 1/3）
    k = typeof k !== "undefined" ? k : 1 / 3;
    // 计算选中效果分别在 x 轴、y 轴方向上的位移（未选中，则位移均为 0）
    const offsetX = isSelected ? Math.cos(midRadian) * 0.1 : 0;
    const offsetY = isSelected ? Math.sin(midRadian) * 0.1 : 0;
    // 计算高亮效果的放大比例（未高亮，则比例为 1）
    const hoverRate = isHovered ? 1.05 : 1;
    // 返回曲面参数方程
    return {
        u: {
            min: -Math.PI,
            max: Math.PI * 3,
            step: Math.PI / 32,
        },
        v: {
            min: 0,
            max: Math.PI * 2,
            step: Math.PI / 20,
        },
        x: function (u, v) {
            if (u < startRadian) {
                return (
                    offsetX + Math.cos(startRadian) * (1 + Math.cos(v) * k) * hoverRate
                );
            }
            if (u > endRadian) {
                return (
                    offsetX + Math.cos(endRadian) * (1 + Math.cos(v) * k) * hoverRate
                );
            }
            return offsetX + Math.cos(u) * (1 + Math.cos(v) * k) * hoverRate;
        },
        y: function (u, v) {
            if (u < startRadian) {
                return (
                    offsetY + Math.sin(startRadian) * (1 + Math.cos(v) * k) * hoverRate
                );
            }
            if (u > endRadian) {
                return (
                    offsetY + Math.sin(endRadian) * (1 + Math.cos(v) * k) * hoverRate
                );
            }
            return offsetY + Math.sin(u) * (1 + Math.cos(v) * k) * hoverRate;
        },
        z: function (u, v) {
            if (u < -Math.PI * 0.5) {
                return Math.sin(u);
            }
            if (u > Math.PI * 2.5) {
                return Math.sin(u) * h * 0.1;
            }
            return Math.sin(v) > 0 ? 1 * h * 0.1 : -1;
        },
    };
};

/**
 * 获取3d丙图的最高扇区的高度
 */
const getHeight3D = (series, height) => {
    series.sort((a, b) => {
        return b.pieData.value - a.pieData.value;
    });
    return (height * 25) / series[0].pieData.value;
};

/**
 * 格式化浮点数
 */
const fomatFloat = (num, n) => {
    let f = parseFloat(num);
    if (isNaN(f)) {
        return false;
    }
    f = Math.round(num * Math.pow(10, n)) / Math.pow(10, n); // n 幂
    let s = f.toString();
    let rs = s.indexOf(".");
    // 判定如果是整数，增加小数点再补0
    if (rs < 0) {
        rs = s.length;
        s += ".";
    }
    while (s.length <= rs + n) {
        s += "0";
    }
    return s;
};
export { getPie3D, getParametricEquation };