3D饼环Echarts图的实现
⾸先确保在项⽬中引⼊了echarts和echarts-gl
"echarts": "^4.9.0",
"echarts-gl": "^1.1.2"
剩下的配置好optionData的数据,交给代码
<template>
<div class="water-eval-container">
<div class="cityGreenLand-charts" id="cityGreenLand-charts">
</div>
</div>
</template>
<script>
import 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: '#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.$nextTick(function() {
this.init();
});
},
methods: {
init() {
//构建3d饼状图
let myChart = echarts.ElementById('cityGreenLand-charts'));
// 传⼊数据⽣成 option
this.option = Pie3D(this.optionData, 0.8);
myChart.setOption(this.option);
//是否需要label指引线,如果要就添加⼀个透明的2d饼状图并调整⾓度使得labelLine和3d的饼状图对齐,并再次setOption this.option.series.push({
name: 'pie2d',
setoptiontype: 'pie',
labelLine:{
length:10,
length2:10
},
startAngle: -20 , //起始⾓度,⽀持范围[0, 360]。
clockwise: false,//饼图的扇区是否是顺时针排布。上述这两项配置主要是为了对齐3d的样式
center: ['50%', '50%'],
data: this.optionData,
itemStyle:{
opacity:0
}
});
myChart.setOption(this.option);
this.bindListen(myChart);
},
getPie3D(pieData, internalDiameterRatio) {
//internalDiameterRatio:透明的空⼼占⽐
let that = this;
let series = [];
let sumValue = 0;
let startValue = 0;
let endValue = 0;
let legendData = [];
let legendBfb = [];
let k = 1 - internalDiameterRatio;
pieData.sort((a, b) => {
return (b.value - a.value);
});
// 为每⼀个饼图数据,⽣成⼀个 series-surface 配置
for (let i = 0; i < pieData.length; i++) {
sumValue += pieData[i].value;
let seriesItem = {
name: typeof pieData[i].name === 'undefined' ? `series${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].lor != 'undefined' ? lor = pieData[i].lor : 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].dRatio = endValue / sumValue;
series[i].parametricEquation = ParametricEquation(series[i].pieData.startRatio, series[i].dRatio, 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 = Height3D(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} ${bfs}`;
}
},
labelLine: {
show: true,
lineStyle: {
color: '#7BC0CB'
}
},
label: {
show: true,
position: 'outside',
rich: {
b: {
color: '#7BC0CB',
fontSize: 12,
lineHeight: 20
},
c: {
fontSize: 16,
},
},
formatter: '{b|{b} \n}{c|{c}}{b| 亩}',
},
tooltip: {
formatter: params => {
if (params.seriesName !== 'mouseoutSeries' && params.seriesName !== 'pie2d') {
let bfb = ((option.series[params.seriesIndex].dRatio - option.series[params.seriesIndex].pieData.startRatio) *
100).toFixed(2);
return `${params.seriesName}<br/>` +
`<span ></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 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 ? s(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 + s(startRadian) * (1 + s(v) * k) * hoverRate; }
if (u > endRadian) {
return offsetX + s(endRadian) * (1 + s(v) * k) * hoverRate; }
return offsetX + s(u) * (1 + s(v) * k) * hoverRate;
},
y: function(u, v) {
if (u < startRadian) {
return offsetY + Math.sin(startRadian) * (1 + s(v) * k) * hoverRate; }
if (u > endRadian) {
return offsetY + Math.sin(endRadian) * (1 + s(v) * k) * hoverRate; }
return offsetY + Math.sin(u) * (1 + s(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 = und(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)
<('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 startRatio = that.option.series[params.seriesIndex].pieData.startRatio;
let endRatio = that.option.series[params.seriesIndex].dRatio;
// 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 = ParametricEquation(that.option.series[
selectedIndex].pieData
.startRatio, that.option.series[selectedIndex].dRatio, 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 = ParametricEquation(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
<('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].dRatio;
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 = ParametricEquation(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].dRatio;
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 = ParametricEquation(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
<('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;
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