先看效果图:
此代码是我在网上搜到了一个案例(原文章暂时找不到了,找到之后我会附在这里),并加以学习和微修改,大家可以借鉴一下,有问题的话咱们评论区讨论。
<template>
<div class="water-eval-container">
<div class="cityGreenLand-charts" id="cityGreenLand-charts"></div>
</div>
</template>
<script>
import * as echarts from "echarts";
import "echarts-gl";
export default {
name: "cityGreenLand",
components: {},
data() {
return {
optionData: [{
name: '林地面积统计',
value: 10000,
itemStyle: {
color: '#51bb85',
}
}, {
name: '草地面积统计',
value: 12116,
itemStyle: {
color: '#d5aa3a'
}
}, {
name: '耕地地面积统计',
value: 16616,
itemStyle: {
color: '#6da1ef'
}
}],
};
},
mounted() {
this.$nextTick(function () {
this.init();
});
},
methods: {
init() {
//构建3d饼状图
let myChart = echarts.init(
document.getElementById("cityGreenLand-charts")
);
// 传入数据生成 option
this.option = this.getPie3D(this.optionData, 0.5);
myChart.setOption(this.option);
//是否需要label指引线,如果要就添加一个透明的2d饼状图并调整角度使得labelLine和3d的饼状图对齐,并再次setOption
this.option.series.push({
name: "pie2d",
type: "pie",
// 去除透明二维饼图的hover效果
hoverAnimation: false ,
labelLine: {
show: true,
length: 10,
length2: 10,
},
label: {
show: true,
normal: {
// 各分区的提示内容
// params: 即下面传入的data数组,通过自定义函数,展示你想要的内容和格式
formatter: function (params) {
return params.value;
},
textStyle: {
// 提示文字的样式
color: "#A1E2FF",
fontSize: 12,
},
},
},
startAngle: -20, //起始角度,支持范围[0, 360]。
clockwise: false, //饼图的扇区是否是顺时针排布。上述这两项配置主要是为了对齐3d的样式
radius: ["63%", "63%"],
center: ["33%", "47%"],
data: this.optionData,
itemStyle: {
opacity: 1,
},
});
myChart.setOption(this.option);
this.bindListen(myChart);
},
getPie3D(pieData, internalDiameterRatio) {
//internalDiameterRatio:透明的空心占比
let that = this;
let series = [];
let sumValue = 0;
let startValue = 0;
let endValue = 0;
let legendData = [];
let legendBfb = [];
let arr = [];
let k = 1 - internalDiameterRatio;
pieData.sort((a, b) => {
return b.value - a.value;
});
// 为每一个饼图数据,生成一个 series-surface 配置
for (let i = 0; i < pieData.length; i++) {
sumValue += pieData[i].value;
let seriesItem = {
name:
typeof pieData[i].name === "undefined"
? `series${i}`
: pieData[i].name,
type: "surface",
parametric: true,
wireframe: {
show: false,
},
pieData: pieData[i],
pieStatus: {
selected: false,
hovered: false,
k: k,
},
center: ["50%", "50%"],
value: pieData[i].value,
};
if (typeof pieData[i].itemStyle != "undefined") {
let itemStyle = {};
typeof pieData[i].itemStyle.color != "undefined"
? (itemStyle.color = pieData[i].itemStyle.color)
: null;
typeof pieData[i].itemStyle.opacity != "undefined"
? (itemStyle.opacity = pieData[i].itemStyle.opacity)
: null;
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 = [];
arr = [];
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 = this.getParametricEquation(
series[i].pieData.startRatio,
series[i].pieData.endRatio,
false,
false,
k,
series[i].pieData.value
);
startValue = endValue;
// let bfb = that.fomatFloat(series[i].pieData.value / sumValue, 4);
let bfb = series[i].pieData.value;
legendData.push({
name: series[i].name,
value: bfb,
});
legendBfb.push({
name: series[i].name,
value: bfb,
});
}
let boxHeight = this.getHeight3D(series, 16); //通过传参设定3d饼/环的高度,26代表26px
// 准备待返回的配置项,把准备好的 legendData、series 传入。
let option = {
legend: {
data: legendData,
orient: "vertical",
right: "10%",
top: "25%",
itemGap: 20,
itemWidth: 10,
itemHeight: 10,
textStyle: {
color: "#A1E2FF",
fontSize: 14,
},
show: true,
icon: "circle",
formatter: function (param) {
let item = legendBfb.filter((item) => item.name == param)[0];
return `${item.name}: ${item.value}`;
},
},
labelLine: {
show: true,
lineStyle: {
color: "#7BC0CB",
},
},
label: {
show: true,
position: "outside",
rich: {
b: {
color: "#fff",
fontSize: 12,
lineHeight: 20,
},
c: {
fontSize: 16,
},
},
formatter: "{b|{b} \n}{c|{c}}{b| 亩}",
},
tooltip: {
formatter: (params) => {
if (
params.seriesName !== "mouseoutSeries" &&
params.seriesName !== "pie2d"
) {
// let bfb = ((option.series[params.seriesIndex].pieData.endRatio - option.series[params.seriesIndex].pieData.startRatio) *
// 100).toFixed(2);
return (
`${params.seriesName}<br/>` +
`<span style="display:inline-block;margin-right:5px;border- radius:10px;width:10px;height:10px;background-color:${params.color};"></span>` +
`${option.series[params.seriesIndex].value}`
);
}
},
},
xAxis3D: {
min: -1,
max: 1,
},
yAxis3D: {
min: -1,
max: 1,
},
zAxis3D: {
min: -1,
max: 'dataMax', //设置为数据在该轴上的最大值为最大刻度
},
grid3D: {
show: false,
top: "-8%",
left: "-15%",
// boxHeight: boxHeight, //圆环的高度
boxHeight: 16, //圆环的高度-设定固定值 避免数据切换后高度发生变化
viewControl: {
//3d效果可以放大、旋转等,请自己去查看官方配置
alpha: 40, //角度
distance: 240, //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;
},
//获取3d丙图的最高扇区的高度
getHeight3D(series, height) {
series.sort((a, b) => {
return b.pieData.value - a.pieData.value;
});
return (height * 25) / series[0].pieData.value;
},
// 生成扇形的曲面参数方程,用于 series-surface.parametricEquation
getParametricEquation(startRatio, endRatio, isSelected, isHovered, k, h) {
// 计算
let midRatio = (startRatio + endRatio) / 2;
let startRadian = startRatio * Math.PI * 2;
let endRadian = endRatio * Math.PI * 2;
let 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)
let offsetX = isSelected ? Math.cos(midRadian) * 0.1 : 0;
let 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)
let 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;
},
};
},
fomatFloat(num, n) {
var f = parseFloat(num);
if (isNaN(f)) {
return false;
}
f = Math.round(num * Math.pow(10, n)) / Math.pow(10, n); // n 幂
var s = f.toString();
var 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;
},
bindListen(myChart) {
// 监听鼠标事件,实现饼图选中效果(单选),近似实现高亮(放大)效果。
let that = this;
let selectedIndex = "";
let hoveredIndex = "";
// 监听点击事件,实现选中效果(单选)
myChart.on("click", function (params) {
// 从 option.series 中读取重新渲染扇形所需的参数,将是否选中取反。
let isSelected =
!that.option.series[params.seriesIndex].pieStatus.selected;
let isHovered =
that.option.series[params.seriesIndex].pieStatus.hovered;
let k = that.option.series[params.seriesIndex].pieStatus.k;
let startRatio =
that.option.series[params.seriesIndex].pieData.startRatio;
let endRatio = that.option.series[params.seriesIndex].pieData.endRatio;
// 如果之前选中过其他扇形,将其取消选中(对 option 更新)
if (selectedIndex !== "" && selectedIndex !== params.seriesIndex) {
that.option.series[selectedIndex].parametricEquation =
that.getParametricEquation(
that.option.series[selectedIndex].pieData.startRatio,
that.option.series[selectedIndex].pieData.endRatio,
false,
false,
k,
that.option.series[selectedIndex].pieData.value
);
that.option.series[selectedIndex].pieStatus.selected = false;
}
// 对当前点击的扇形,执行选中/取消选中操作(对 option 更新)
that.option.series[params.seriesIndex].parametricEquation =
that.getParametricEquation(
startRatio,
endRatio,
isSelected,
isHovered,
k,
that.option.series[params.seriesIndex].pieData.value
);
that.option.series[params.seriesIndex].pieStatus.selected = isSelected;
// 如果本次是选中操作,记录上次选中的扇形对应的系列号 seriesIndex
isSelected ? (selectedIndex = params.seriesIndex) : null;
// 使用更新后的 option,渲染图表
myChart.setOption(that.option);
});
// 监听 mouseover,近似实现高亮(放大)效果
myChart.on("mouseover", function (params) {
// 准备重新渲染扇形所需的参数
let isSelected;
let isHovered;
let startRatio;
let endRatio;
let k;
// 如果触发 mouseover 的扇形当前已高亮,则不做操作
if (hoveredIndex === params.seriesIndex) {
return;
// 否则进行高亮及必要的取消高亮操作
} else {
// 如果当前有高亮的扇形,取消其高亮状态(对 option 更新)
if (hoveredIndex !== "") {
// 从 option.series 中读取重新渲染扇形所需的参数,将是否高亮设置为 false。
isSelected = that.option.series[hoveredIndex].pieStatus.selected;
isHovered = false;
startRatio = that.option.series[hoveredIndex].pieData.startRatio;
endRatio = that.option.series[hoveredIndex].pieData.endRatio;
k = that.option.series[hoveredIndex].pieStatus.k;
// 对当前点击的扇形,执行取消高亮操作(对 option 更新)
that.option.series[hoveredIndex].parametricEquation =
that.getParametricEquation(
startRatio,
endRatio,
isSelected,
isHovered,
k,
that.option.series[hoveredIndex].pieData.value
);
that.option.series[hoveredIndex].pieStatus.hovered = isHovered;
// 将此前记录的上次选中的扇形对应的系列号 seriesIndex 清空
hoveredIndex = "";
}
// 如果触发 mouseover 的扇形不是透明圆环,将其高亮(对 option 更新)
if (
params.seriesName !== "mouseoutSeries" &&
params.seriesName !== "pie2d"
) {
// 从 option.series 中读取重新渲染扇形所需的参数,将是否高亮设置为 true。
isSelected =
that.option.series[params.seriesIndex].pieStatus.selected;
isHovered = true;
startRatio =
that.option.series[params.seriesIndex].pieData.startRatio;
endRatio = that.option.series[params.seriesIndex].pieData.endRatio;
k = that.option.series[params.seriesIndex].pieStatus.k;
// 对当前点击的扇形,执行高亮操作(对 option 更新)
that.option.series[params.seriesIndex].parametricEquation =
that.getParametricEquation(
startRatio,
endRatio,
isSelected,
isHovered,
k,
that.option.series[params.seriesIndex].pieData.value + 5
);
that.option.series[params.seriesIndex].pieStatus.hovered =
isHovered;
// 记录上次高亮的扇形对应的系列号 seriesIndex
hoveredIndex = params.seriesIndex;
}
// 使用更新后的 option,渲染图表
myChart.setOption(that.option);
}
});
// 修正取消高亮失败的 bug
myChart.on("globalout", function () {
// 准备重新渲染扇形所需的参数
let isSelected;
let isHovered;
let startRatio;
let endRatio;
let k;
if (hoveredIndex !== "") {
// 从 option.series 中读取重新渲染扇形所需的参数,将是否高亮设置为 true。
isSelected = that.option.series[hoveredIndex].pieStatus.selected;
isHovered = false;
k = that.option.series[hoveredIndex].pieStatus.k;
startRatio = that.option.series[hoveredIndex].pieData.startRatio;
endRatio = that.option.series[hoveredIndex].pieData.endRatio;
// 对当前点击的扇形,执行取消高亮操作(对 option 更新)
that.option.series[hoveredIndex].parametricEquation =
that.getParametricEquation(
startRatio,
endRatio,
isSelected,
isHovered,
k,
that.option.series[hoveredIndex].pieData.value
);
that.option.series[hoveredIndex].pieStatus.hovered = isHovered;
// 将此前记录的上次选中的扇形对应的系列号 seriesIndex 清空
hoveredIndex = "";
}
// 使用更新后的 option,渲染图表
myChart.setOption(that.option);
});
},
},
};
</script>
<style lang="scss" scoped>
.water-eval-container {
width: 100%;
height: 100%;
}
.cityGreenLand-charts {
height: 100%;
width: 100%;
}
</style>