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echarts 实现3D饼状图加 label标签显示

news 2024/10/31 15:49:33

文章目录

前言
代码实现
页面效果
总结

前言

最近有个页面需要渲染一个3D饼状图带label标签显示记录下实现代码效果

代码实现

<template><div class="water-eval-container"><div class="cityGreenLand-charts" id="cityGreenLand-charts"></div></div>
</template><script>
import 'echarts-gl';
export default {name: "TestDemo",components: {},data() {return {optionData: [{name: '林地面积统计',value: 10000,itemStyle: {color: '#22c4ff',}}, {name: '草地面积统计',value: 12116,itemStyle: {color: '#aaff00'}}, {name: '耕地地面积统计',value: 16616,itemStyle: {color: '#ffaaff'}}],}},mounted() {this.$nextTick(()=>{this.getData()})},methods: {getData() {//构建3d饼状图let myChart = this.$echarts.init(document.getElementById('cityGreenLand-charts'));// 传入数据生成 optionthis.option = this.getPie3D(this.optionData, 0);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 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${i}` : pieData[i].name,type: 'surface',parametric: true,wireframe: {show: false},pieData: pieData[i],pieStatus: {selected: false,hovered: false,k: k},center: ['10%', '50%']};if (typeof pieData[i].itemStyle != 'undefined') {let itemStyle = {};typeof pieData[i].itemStyle.color != 'undefined' ? itemStyle.color = pieData[i].itemStyle.color : null;typeof pieData[i].itemStyle.opacity != 'undefined' ? itemStyle.opacity = pieData[i].itemStyle.opacity : null;seriesItem.itemStyle = itemStyle;}series.push(seriesItem);}// 使用上一次遍历时，计算出的数据和 sumValue，调用 getParametricEquation 函数，// 向每个 series-surface 传入不同的参数方程 series-surface.parametricEquation，也就是实现每一个扇形。legendData = [];legendBfb = [];for (let i = 0; i < series.length; i++) {endValue = startValue + series[i].pieData.value;series[i].pieData.startRatio = startValue / sumValue;series[i].pieData.endRatio = endValue / sumValue;series[i].parametricEquation = this.getParametricEquation(series[i].pieData.startRatio, series[i].pieData.endRatio,false, false, k, series[i].pieData.value);startValue = endValue;let bfb = that.fomatFloat(series[i].pieData.value / sumValue, 4);legendData.push({name: series[i].name,value: bfb});legendBfb.push({name: series[i].name,value: bfb});}let boxHeight = this.getHeight3D(series, 26);//通过传参设定3d饼/环的高度，26代表26px// 准备待返回的配置项，把准备好的 legendData、series 传入。let option = {legend: {data: legendData,orient: 'horizontal',left: 10,top: 10,itemGap: 10,textStyle: {color: '#A1E2FF',},show: true,icon: "circle",formatter: function(param) {let item = legendBfb.filter(item => item.name == param)[0];let bfs = that.fomatFloat(item.value * 100, 2) + "%";return `${item.name}  ${bfs}`;}},labelLine: {show: false,lineStyle: {color: '#7BC0CB'}},label: {normal: {show: true, // 显示标签position: 'inside', // 将标签放置在扇区内侧formatter: '{b}: {c} ({d}%)', // 自定义标签格式textStyle: {color: '#000' // 标签文字颜色}}},tooltip: {formatter: params => {if (params.seriesName !== 'mouseoutSeries' && params.seriesName !== 'pie2d') {let bfb = ((option.series[params.seriesIndex].pieData.endRatio - option.series[params.seriesIndex].pieData.startRatio) *100).toFixed(2);return `${params.seriesName}<br/>` +`<span style="display:inline-block;margin-right:5px;border-radius:10px;width:10px;height:10px;background-color:${params.color};"></span>` +`${ bfb }%`;}}},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: 40, //角度distance: 300,//调整视角到主体的距离，类似调整zoomrotateSensitivity: 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};// 在原有的getPie3D方法中添加以下配置option.series.push({name: 'pie2d',type: 'pie',radius: ['20%', '50%'], // 根据需要调整半径center: ['50%', '50%'], // 根据需要调整位置data: this.optionData.map(item => ({value: item.value,name: item.name,itemStyle: {color: 'transparent'}})),label: {show: true,position: 'inside', // 或者 'outside'，根据需要调整formatter: '{b}: {c}',textStyle: {color: '#fff', // 标签文字颜色fontSize: 14}},labelLine: {show: true,length: 10,length2: 10,lineStyle: {color: 'rgba(0,0,0,0)' // 标签连接线也设置为透明，使其不可见}}});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.parametricEquationgetParametricEquation(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;},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 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);});}}
}
</script>
<style scoped>
.water-eval-container {width: 100%;height: 100%;
}
.cityGreenLand-charts {height: 500px;width: 500px;
}
</style>