class Node {
constructor(name) {
this.name = name;
this.inputs = new Set;
this.outputs = new Set;
this._visited = false;
this._indegree = 0;
}
}
{
// if node has no iinputs , it is root node.
let nodes=findAllRootNodes(edges)
return dot`digraph "d3-bar-chart" {
${edges.map(([i, o]) => `${i} -> ${o}`).join("\n")}
${nodes.map(node=>`${node.name}[color="red"]`).join("\n")}
}`
}
function findAllRootNodes(edges){
let nodes=getNodesFromEdges(edges)
return nodes.filter((node)=>node.inputs.size==0)
}
findAllRootNodes(edges)
function getAllDecendents(rootName,nodes){
const set = new Set(nodes.filter(n => n.name === rootName));
for (let o of set) o.outputs.forEach(set.add, set);
return [...set]
}
{
// example:get d3 and its decendents
let nodes=getNodesFromEdges(edges)
let decendents=getAllDecendents(selected_node,nodes)
return dot`digraph "d3-bar-chart" {
${edges.map(([i, o]) => `${i} -> ${o}`).join("\n")}
${decendents.map(node=>`${node.name}[color="red"]`).join("\n")}
}`
}
function getNodesList(edges){
const set = new Set;
for (const [i, o] of edges) {
set.add(i)
set.add(o)
}
return [...set]
}
function nodesToJson(nodes){
return [...new Set(nodes)].map(e=>{
return {name:e,value:''}
})
}
function edgesToJson(edges){
return [...new Set(edges)].map(([i,o])=>{
return {source:i,target:o}
})
}
function toJson(edges){
let nodeJson=nodesToJson(getNodesList(edges))
let edgesJson=edgesToJson(edges)
return JSON.stringify({nodes:nodeJson,links:edgesJson})
}
toJson(edges)
{
var text=toJson(edges)
var data=JSON.parse(text)
var nodes=data.nodes.map(d=>{
return {
name:d.name,
symbolSize:20,
value:'',
x:Math.random()*900,
y:Math.random()*500
}
})
var links=data.links
/* Or as follows:
var nodes=nodesToJson(getNodesList(edges)).map(d=>{
return {
name:d.name,
symbolSize:10,
value:5,
x:Math.random()*900,
y:Math.random()*500
}
})
var links=edgesToJson(edges)
*/
var option = {
tooltip: {},
series: [
{
name: 'Echarts Example',
type: 'graph',
layout: 'force',//or 'force'
animation: false,
data: nodes,
edges: links,
roam: false,
label: {
show:true,
position: 'right',//or inside,
formatter: '{b}'
},
lineStyle: {
color: 'red',
//curveness: 0.3
},
edgeSymbol: ['circle', 'arrow'],
force: {
//initLayout: 'circular',
gravity: 0,
repulsion: 100,
edgeLength: 200
},
draggable:true,
emphasis: {
focus: 'adjacency',
lineStyle: {
width: 3
}
}
}
]
};
const myChart=echarts.init(document.getElementById('main'));
myChart.setOption(option);
}
jsonstring=JSON.stringify(toTreeLikeJSON('d3'))
echarts = require("https://cdn.jsdelivr.net/npm/echarts@5.3.3/dist/echarts.min.js")
edges=edges1.concat(edges2).concat(edges3)
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.