Echarts+Vue 实现知识图谱
需求描述
把一类错综复杂的知识点按照相关性规则连线，客观汇总展现出来，切换类型可动态刷新图谱，图谱节点能点击交互。
实现效果
实现思路
先格式化处理后台拿到的数据，再利用Echarts 的 graph 类型图库进行配置绘制。
代码实现
先用mock造个数据实现接口，其中图谱数据中的 name就是节点展示的内容，category 可以作为过滤条件给节点设置不同的颜色，若要设置特殊大小可以symbolSize设值， id是用来前后连线的标识。
/**
* 图谱数据源源
*/
export const data = [
{
id:1,
name:'测试节点',
categary:'1',
symbolSize: 60
},
{
id:2,
name:'测试节点',
categary:'1',
symbolSize: 40
},
{
id:3,
name:'测试节点',
categary:'2',
},
{
id:4,
name:'测试节点',
categary:'',
},
{
id:5,
name:'测试节点测试节点',
categary:'',
},
{
id:6,
name:'测试节点',
categary:'2',
},
{
id:7,
name:'测试节点',
categary:'',
},
{
id:8,
name:'测试节点',
categary:'',
},
{
id:9,
name:'测试节点',
categary:'',
},
{
id:10,
name:'测试节点',
categary:'',测试节点
}
];
//节点连线
let linkData = [
{source: '2', target: '3', name: ''},
{source: '3', target: '4', name: ''},
{source: '3', target: '5', name: ''},
{source: '5', target: '6', name: ''},
{source: '5', target: '7', name: ''},
{source: '5', target: '8', name: ''},
{source: '9', target: '10', name: ''},
{source: '10', target: '9', name: ''},
{source: '1', target: '2' , name: ''},
{source: '1', target: '10', name: ''}
]
/**
* 模糊查询大类
* @param {*} name
*/
export const search = (name)=>{
return new Promise((resolve,reject)=>{
let result = {
seriesData: [],
linksData: []
}
let list = data.filter(item=>item.name.indexOf(name)>=0)
if(list&&list.length>0){
result.seriesData = list ||[];
}else{
result.seriesData = data ||[];
}
result.linksData = linkData ||[];
if(list.length>0){
resolve(result)
}else{
reject()
}
})
}
export const getAllData = ()=>{
return new Promise((resolve,reject)=>{
let result = {
seriesData: [],
linksData: []
}
result.seriesData = data||[];
result.linksData = linkData ||[];
if(data.length>0){
resolve(result)
}else{
reject()
}
})
}
/**
* 分类2
*/
export const categarys = ["建设用地"]
封装一个chart组件，实现图谱展示
<template>
<div id="chart" class="chart"></div>
</template>
<script>
import { expendNodes } from "./mock";
var echarts = require("echarts/lib/echarts");
require("echarts/lib/chart/graph");
require("echarts/lib/component/tooltip");
require("echarts/lib/component/title");
export default {
name: "Charts",
props: {
chartList: {
type: Object,
required: true,
},
},
watch: {
chartList: {
handler(val) {
this.formatData(val || [], true);
},
},
},
data() {
return {
myChart: "",
seriesData: [],
seriesLinks: [],
categories:[],
lastClickId: "",
colors: ["#a3d2ca","#056676","#ea2c62","#16a596","#03c4a1","#f5a25d",
"#8CD282","#32e0c4","#00FAE1","#f05454"],
};
},
methods: {
/**
* 节点点击事件
*/
async nodeClick(params) {
const index = this.seriesData.findIndex(
(item) => item.id === params.data.id
);
console.log('点了节点:'+index+1,"clicked");
},
/**
* 设置echarts配置项,重绘画布
*/
initCharts() {
const that = this;
if (!this.myChart) {
this.myChart = echarts.init(document.getElementById("chart"));
this.myChart.on("click", (params) => {
if (params.dataType === "node") {
//判断点击的是图表的节点部分
this.nodeClick(params);
}
});
}
// 指定图表的配置项和数据
let option = {
// 动画更新变化时间
animationDurationUpdate: 500,
animationEasingUpdate: "quinticInOut",
tooltip: {
show: false,
},
series: [
{
type: "graph",
layout: "force",
legendHoverLink: true, //是否启用图例 hover(悬停) 时的联动高亮。
hoverAnimation: true, //是否开启鼠标悬停节点的显示动画
focusNodeAdjacency: true,
edgeLabel: {
position: "middle", //边上的文字样式
normal: {
show: true,
textStyle: {
fontSize: 12,
},
position: "middle",
formatter: function (x) {
return x.data.name;
},
},
},
edgeSymbol: ["", "arrow"],
force: {
edgeLength: 15,
repulsion: 200,
},
roam: true,
draggable: true, //每个节点的拖拉
itemStyle: {
normal: {
color: "#00FAE1",
cursor: "pointer",
//color:Math.floor(Math.random()*16777215).toString(16),
//color: ['#fc853e','#28cad8','#9564bf','#bd407e','#28cad8','#fc853e','#e5a214'],
label: {
show: true,
position: [-10, -15],
textStyle: {
//标签的字体样式
color: "#fff", //字体颜色
fontStyle: "normal", //文字字体的风格 'normal'标准 'italic'斜体 'oblique' 倾斜
fontWeight: "bold", //'normal'标准'bold'粗的'bolder'更粗的'lighter'更细的或100 | 200 | 300 | 400...
fontFamily: "sans-serif", //文字的字体系列
fontSize: 12, //字体大小
},
},
nodeStyle: {
brushType: "both",
borderColor: "rgba(255,215,0,0.4)",
borderWidth: 1,
},
},
//鼠标放上去有阴影效果
emphasis: {
shadowColor: "#00FAE1",
shadowOffsetX: 0,
shadowOffsetY: 0,
shadowBlur: 40,
},
},
lineStyle: {
width: 2,
},
label: {
fontSize: 18,
},
symbolSize: 24, //节点大小
links: this.seriesLinks,
data: this.seriesData,
categories:this.categories,
cursor: "pointer",
},
],
};
// 使用刚指定的配置项和数据显示图表。
this.myChart.setOption(option);
},
/**
* 格式化数据到表格需要的数据
*/
formatData(list, reset = false) {
const that =this;
let nodes = list.seriesData;
this.seriesData = [];
this.seriesLinks = [];
let colorIndex = 0;
let data =[];
let loadedCat=[];
nodes.forEach((item,index)=>{
if(item.categary && loadedCat.indexOf(item.categary) === -1){
colorIndex = Math.floor((Math.random()*that.colors.length));
loadedCat.push(item.categary);
this.categories.push({name:item.categary});
}
item.itemStyle = {
color: that.colors[colorIndex],
borderColor: '#ffffff'
}
data.push(item);
})
this.seriesData.push(...data);
this.seriesLinks.push(...list.linksData);
this.initCharts();
},
},
beforeDestroy() {},
};
</script>
<style scoped>
.chart {
height: 100%;
}
</style>
在其他组件中调用chart组件，并传入展示的数据内容
<Charts ref="charts" v-show="type === 2" :chartList="searchList" />
完毕！
