.6.30今天我学习了如何使用echarts渲染一个3d的饼图，效果如下：
相关代码如下：
<template><div ref="pie3d"/></template><script>export default {data() {return {optionData:[{"code": "3","name": "病区四","cws": 80,"zcs": 20,"zcl": "25%","value": 80,"startRatio": 0,"endRatio": 0.34782608695652173},{"code": "0","name": "病区一","cws": 60,"zcs": 30,"zcl": "50%","value": 60,"startRatio": 0.34782608695652173,"endRatio": 0.6086956521739131},{"code": "2","name": "病区三","cws": 50,"zcs": 20,"zcl": "40%","value": 50,"startRatio": 0.6086956521739131,"endRatio": 0.8260869565217391},{"code": "1","name": "病区二","cws": 40,"zcs": 30,"zcl": "75%","value": 40,"startRatio": 0.8260869565217391,"endRatio": 1}]}},mounted() {this.myChart = this.$echarts.init(this.$refs.pie3d);this.init()},methods: {//初始化构建init() {// 传入数据生成 option ; getPie3D(数据，透明的空心占比（调节中间空心范围的0就是普通饼1就很镂空）)this.option = this.getPie3D(this.optionData, 0.85);//将配置项设置进去this.myChart.setOption(this.option);//鼠标移动上去特效效果this.bindListen(this.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。bindListen(myChart) {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 seriesIndexisSelected ? 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 seriesIndexhoveredIndex = 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 bugmyChart.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);});},getPie3D(pieData, internalDiameterRatio) {let that = this;let series = [];let sumValue = 0;let startValue = 0;let endValue = 0;let legendData = [];let legendBfb = [];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(参数曲面) 配置for (let i = 0; i < pieData.length; i++) {sumValue += pieData[i].value;let seriesItem = {//系统名称name: typeof pieData[i].name === 'undefined' ? `series${i}` : pieData[i].name,type: 'surface',//是否为参数曲面（是）parametric: true,//曲面图网格线（否）上面一根一根的wireframe: {show: false},pieData: pieData[i],pieStatus: {selected: false,hovered: false,k: k},};//曲面的颜色、不透明度等样式。if (typeof pieData[i].itemStyle != 'undefined') {let itemStyle = {};typeof pieData[i].itemStyle.color != 'undefined' ? itemStyle.color = pieData[i].itemStyle.color : null;typeof pieData[i].itemStyle.opacity != 'undefined' ? itemStyle.opacity = pieData[i].itemStyle.opacity : null;seriesItem.itemStyle = itemStyle;}series.push(seriesItem);}// 使用上一次遍历时，计算出的数据和 sumValue，调用 getParametricEquation 函数，// 向每个 series-surface 传入不同的参数方程 series-surface.parametricEquation，也就是实现每一个扇形。legendData = [];legendBfb = [];for (let i = 0; i < series.length; i++) {endValue = startValue + series[i].pieData.value;series[i].pieData.startRatio = startValue / sumValue;series[i].pieData.endRatio = endValue / sumValue;series[i].parametricEquation = this.getParametricEquation(series[i].pieData.startRatio, series[i].pieData.endRatio,false, false, k, series[i].pieData.value);startValue = endValue;let bfb = that.fomatFloat(series[i].pieData.value / sumValue, 4);legendData.push({name: series[i].name,value: bfb});legendBfb.push({name: series[i].name,value: bfb});}//(第二个参数可以设置你这个环形的高低程度)let boxHeight = this.getHeight3D(series, 15);//通过传参设定3d饼/环的高度// 准备待返回的配置项，把准备好的 legendData、series 传入。let option = {//图例组件legend: {data: legendData,//图例列表的布局朝向。orient: 'horizontal',left: '0%',//图例文字每项之间的间隔itemGap: 10,textStyle: {color: '#A1E2FF',fontSize: '0.5rem',},show: true,icon: "circle",//格式化图例文本（我是数值什么显示什么）// formatter: function (name) {// var target;// for (var i = 0, l = pieData.length; i < l; i++) {//if (pieData[i].name == name) {// target = pieData[i].value;//}// }// return `${name}: ${target}`;// }// 这个可以显示百分比那种（可以根据你想要的来配置）// formatter: function(param) {// let item = legendBfb.filter(item => item.name == param)[0];// let bfs = that.fomatFloat(item.value * 100, 2) + "%";// console.log(item.name)// return `${item.name} :${bfs}`;// }},//移动上去提示的文本内容tooltip: {formatter: params => {if (params.seriesName !== 'mouseoutSeries' && params.seriesName !== 'pie2d') {let bfb = ((option.series[params.seriesIndex].pieData.endRatio - option.series[params.seriesIndex].pieData.startRatio) *100).toFixed(2);return `${params.seriesName}<br/>` +`<span style="display:inline-block;margin-right:5px;border-radius:10px;width:10px;height:10px;background-color:${params.color};"></span>` +`${bfb}`;}}},//这个可以变形xAxis3D: {min: -1,max: 1},yAxis3D: {min: -1,max: 1},zAxis3D: {min: -1,max: 1},//此处是修改样式的重点grid3D: {show: false,boxHeight: boxHeight, //圆环的高度//这是饼图的位置top: '15%',viewControl: { //3d效果可以放大、旋转等，请自己去查看官方配置alpha: 35, //角度(这个很重要 调节角度的)distance: 165,//调整视角到主体的距离，类似调整zoom(这是整体大小)rotateSensitivity: 1, //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: true //自动旋转}},series: series};return option;},getHeight3D(series, height) {series.sort((a, b) => {return (b.pieData.value - a.pieData.value);})return height * 25 / series[0].pieData.value;},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 * .1;}return Math.sin(v) > 0 ? 1 * h * .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0if (rs < 0) {rs = s.length;s += '.';}while (s.length <= rs + n) {s += '0';}return s;},},</script>
