d3.js の Force-directed graph サンプル をコピペで動かせるようにしただけのものです。
ソースコード(コピペで動くと思います)
<div id="drawArea"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/7.8.5/d3.min.js"
integrity="sha512-M7nHCiNUOwFt6Us3r8alutZLm9qMt4s9951uo8jqO4UwJ1hziseL6O3ndFyigx6+LREfZqnhHxYjKRJ8ZQ69DQ=="
crossorigin="anonymous" referrerpolicy="no-referrer"></script>
<script>
const data =
{
"nodes": [
{ "id": "Myriel", "group": 1 },
{ "id": "Napoleon", "group": 1 },
{ "id": "Mlle.Baptistine", "group": 1 },
{ "id": "Mme.Magloire", "group": 1 },
{ "id": "CountessdeLo", "group": 1 },
{ "id": "Geborand", "group": 1 },
{ "id": "Champtercier", "group": 1 },
{ "id": "Cravatte", "group": 1 },
{ "id": "Count", "group": 1 },
{ "id": "OldMan", "group": 1 },
{ "id": "Labarre", "group": 2 },
{ "id": "Valjean", "group": 2 },
{ "id": "Marguerite", "group": 3 },
{ "id": "Mme.deR", "group": 2 },
{ "id": "Isabeau", "group": 2 },
{ "id": "Gervais", "group": 2 },
{ "id": "Tholomyes", "group": 3 },
{ "id": "Listolier", "group": 3 },
{ "id": "Fameuil", "group": 3 },
{ "id": "Blacheville", "group": 3 },
{ "id": "Favourite", "group": 3 },
{ "id": "Dahlia", "group": 3 },
{ "id": "Zephine", "group": 3 },
{ "id": "Fantine", "group": 3 },
{ "id": "Mme.Thenardier", "group": 4 },
{ "id": "Thenardier", "group": 4 },
{ "id": "Cosette", "group": 5 },
{ "id": "Javert", "group": 4 },
{ "id": "Fauchelevent", "group": 0 },
{ "id": "Bamatabois", "group": 2 },
{ "id": "Perpetue", "group": 3 },
{ "id": "Simplice", "group": 2 },
{ "id": "Scaufflaire", "group": 2 },
{ "id": "Woman1", "group": 2 },
{ "id": "Judge", "group": 2 },
{ "id": "Champmathieu", "group": 2 },
{ "id": "Brevet", "group": 2 },
{ "id": "Chenildieu", "group": 2 },
{ "id": "Cochepaille", "group": 2 },
{ "id": "Pontmercy", "group": 4 },
{ "id": "Boulatruelle", "group": 6 },
{ "id": "Eponine", "group": 4 },
{ "id": "Anzelma", "group": 4 },
{ "id": "Woman2", "group": 5 },
{ "id": "MotherInnocent", "group": 0 },
{ "id": "Gribier", "group": 0 },
{ "id": "Jondrette", "group": 7 },
{ "id": "Mme.Burgon", "group": 7 },
{ "id": "Gavroche", "group": 8 },
{ "id": "Gillenormand", "group": 5 },
{ "id": "Magnon", "group": 5 },
{ "id": "Mlle.Gillenormand", "group": 5 },
{ "id": "Mme.Pontmercy", "group": 5 },
{ "id": "Mlle.Vaubois", "group": 5 },
{ "id": "Lt.Gillenormand", "group": 5 },
{ "id": "Marius", "group": 8 },
{ "id": "BaronessT", "group": 5 },
{ "id": "Mabeuf", "group": 8 },
{ "id": "Enjolras", "group": 8 },
{ "id": "Combeferre", "group": 8 },
{ "id": "Prouvaire", "group": 8 },
{ "id": "Feuilly", "group": 8 },
{ "id": "Courfeyrac", "group": 8 },
{ "id": "Bahorel", "group": 8 },
{ "id": "Bossuet", "group": 8 },
{ "id": "Joly", "group": 8 },
{ "id": "Grantaire", "group": 8 },
{ "id": "MotherPlutarch", "group": 9 },
{ "id": "Gueulemer", "group": 4 },
{ "id": "Babet", "group": 4 },
{ "id": "Claquesous", "group": 4 },
{ "id": "Montparnasse", "group": 4 },
{ "id": "Toussaint", "group": 5 },
{ "id": "Child1", "group": 10 },
{ "id": "Child2", "group": 10 },
{ "id": "Brujon", "group": 4 },
{ "id": "Mme.Hucheloup", "group": 8 }
],
"links": [
{ "source": "Napoleon", "target": "Myriel", "value": 1 },
{ "source": "Mlle.Baptistine", "target": "Myriel", "value": 8 },
{ "source": "Mme.Magloire", "target": "Myriel", "value": 10 },
{ "source": "Mme.Magloire", "target": "Mlle.Baptistine", "value": 6 },
{ "source": "CountessdeLo", "target": "Myriel", "value": 1 },
{ "source": "Geborand", "target": "Myriel", "value": 1 },
{ "source": "Champtercier", "target": "Myriel", "value": 1 },
{ "source": "Cravatte", "target": "Myriel", "value": 1 },
{ "source": "Count", "target": "Myriel", "value": 2 },
{ "source": "OldMan", "target": "Myriel", "value": 1 },
{ "source": "Valjean", "target": "Labarre", "value": 1 },
{ "source": "Valjean", "target": "Mme.Magloire", "value": 3 },
{ "source": "Valjean", "target": "Mlle.Baptistine", "value": 3 },
{ "source": "Valjean", "target": "Myriel", "value": 5 },
{ "source": "Marguerite", "target": "Valjean", "value": 1 },
{ "source": "Mme.deR", "target": "Valjean", "value": 1 },
{ "source": "Isabeau", "target": "Valjean", "value": 1 },
{ "source": "Gervais", "target": "Valjean", "value": 1 },
{ "source": "Listolier", "target": "Tholomyes", "value": 4 },
{ "source": "Fameuil", "target": "Tholomyes", "value": 4 },
{ "source": "Fameuil", "target": "Listolier", "value": 4 },
{ "source": "Blacheville", "target": "Tholomyes", "value": 4 },
{ "source": "Blacheville", "target": "Listolier", "value": 4 },
{ "source": "Blacheville", "target": "Fameuil", "value": 4 },
{ "source": "Favourite", "target": "Tholomyes", "value": 3 },
{ "source": "Favourite", "target": "Listolier", "value": 3 },
{ "source": "Favourite", "target": "Fameuil", "value": 3 },
{ "source": "Favourite", "target": "Blacheville", "value": 4 },
{ "source": "Dahlia", "target": "Tholomyes", "value": 3 },
{ "source": "Dahlia", "target": "Listolier", "value": 3 },
{ "source": "Dahlia", "target": "Fameuil", "value": 3 },
{ "source": "Dahlia", "target": "Blacheville", "value": 3 },
{ "source": "Dahlia", "target": "Favourite", "value": 5 },
{ "source": "Zephine", "target": "Tholomyes", "value": 3 },
{ "source": "Zephine", "target": "Listolier", "value": 3 },
{ "source": "Zephine", "target": "Fameuil", "value": 3 },
{ "source": "Zephine", "target": "Blacheville", "value": 3 },
{ "source": "Zephine", "target": "Favourite", "value": 4 },
{ "source": "Zephine", "target": "Dahlia", "value": 4 },
{ "source": "Fantine", "target": "Tholomyes", "value": 3 },
{ "source": "Fantine", "target": "Listolier", "value": 3 },
{ "source": "Fantine", "target": "Fameuil", "value": 3 },
{ "source": "Fantine", "target": "Blacheville", "value": 3 },
{ "source": "Fantine", "target": "Favourite", "value": 4 },
{ "source": "Fantine", "target": "Dahlia", "value": 4 },
{ "source": "Fantine", "target": "Zephine", "value": 4 },
{ "source": "Fantine", "target": "Marguerite", "value": 2 },
{ "source": "Fantine", "target": "Valjean", "value": 9 },
{ "source": "Mme.Thenardier", "target": "Fantine", "value": 2 },
{ "source": "Mme.Thenardier", "target": "Valjean", "value": 7 },
{ "source": "Thenardier", "target": "Mme.Thenardier", "value": 13 },
{ "source": "Thenardier", "target": "Fantine", "value": 1 },
{ "source": "Thenardier", "target": "Valjean", "value": 12 },
{ "source": "Cosette", "target": "Mme.Thenardier", "value": 4 },
{ "source": "Cosette", "target": "Valjean", "value": 31 },
{ "source": "Cosette", "target": "Tholomyes", "value": 1 },
{ "source": "Cosette", "target": "Thenardier", "value": 1 },
{ "source": "Javert", "target": "Valjean", "value": 17 },
{ "source": "Javert", "target": "Fantine", "value": 5 },
{ "source": "Javert", "target": "Thenardier", "value": 5 },
{ "source": "Javert", "target": "Mme.Thenardier", "value": 1 },
{ "source": "Javert", "target": "Cosette", "value": 1 },
{ "source": "Fauchelevent", "target": "Valjean", "value": 8 },
{ "source": "Fauchelevent", "target": "Javert", "value": 1 },
{ "source": "Bamatabois", "target": "Fantine", "value": 1 },
{ "source": "Bamatabois", "target": "Javert", "value": 1 },
{ "source": "Bamatabois", "target": "Valjean", "value": 2 },
{ "source": "Perpetue", "target": "Fantine", "value": 1 },
{ "source": "Simplice", "target": "Perpetue", "value": 2 },
{ "source": "Simplice", "target": "Valjean", "value": 3 },
{ "source": "Simplice", "target": "Fantine", "value": 2 },
{ "source": "Simplice", "target": "Javert", "value": 1 },
{ "source": "Scaufflaire", "target": "Valjean", "value": 1 },
{ "source": "Woman1", "target": "Valjean", "value": 2 },
{ "source": "Woman1", "target": "Javert", "value": 1 },
{ "source": "Judge", "target": "Valjean", "value": 3 },
{ "source": "Judge", "target": "Bamatabois", "value": 2 },
{ "source": "Champmathieu", "target": "Valjean", "value": 3 },
{ "source": "Champmathieu", "target": "Judge", "value": 3 },
{ "source": "Champmathieu", "target": "Bamatabois", "value": 2 },
{ "source": "Brevet", "target": "Judge", "value": 2 },
{ "source": "Brevet", "target": "Champmathieu", "value": 2 },
{ "source": "Brevet", "target": "Valjean", "value": 2 },
{ "source": "Brevet", "target": "Bamatabois", "value": 1 },
{ "source": "Chenildieu", "target": "Judge", "value": 2 },
{ "source": "Chenildieu", "target": "Champmathieu", "value": 2 },
{ "source": "Chenildieu", "target": "Brevet", "value": 2 },
{ "source": "Chenildieu", "target": "Valjean", "value": 2 },
{ "source": "Chenildieu", "target": "Bamatabois", "value": 1 },
{ "source": "Cochepaille", "target": "Judge", "value": 2 },
{ "source": "Cochepaille", "target": "Champmathieu", "value": 2 },
{ "source": "Cochepaille", "target": "Brevet", "value": 2 },
{ "source": "Cochepaille", "target": "Chenildieu", "value": 2 },
{ "source": "Cochepaille", "target": "Valjean", "value": 2 },
{ "source": "Cochepaille", "target": "Bamatabois", "value": 1 },
{ "source": "Pontmercy", "target": "Thenardier", "value": 1 },
{ "source": "Boulatruelle", "target": "Thenardier", "value": 1 },
{ "source": "Eponine", "target": "Mme.Thenardier", "value": 2 },
{ "source": "Eponine", "target": "Thenardier", "value": 3 },
{ "source": "Anzelma", "target": "Eponine", "value": 2 },
{ "source": "Anzelma", "target": "Thenardier", "value": 2 },
{ "source": "Anzelma", "target": "Mme.Thenardier", "value": 1 },
{ "source": "Woman2", "target": "Valjean", "value": 3 },
{ "source": "Woman2", "target": "Cosette", "value": 1 },
{ "source": "Woman2", "target": "Javert", "value": 1 },
{ "source": "MotherInnocent", "target": "Fauchelevent", "value": 3 },
{ "source": "MotherInnocent", "target": "Valjean", "value": 1 },
{ "source": "Gribier", "target": "Fauchelevent", "value": 2 },
{ "source": "Mme.Burgon", "target": "Jondrette", "value": 1 },
{ "source": "Gavroche", "target": "Mme.Burgon", "value": 2 },
{ "source": "Gavroche", "target": "Thenardier", "value": 1 },
{ "source": "Gavroche", "target": "Javert", "value": 1 },
{ "source": "Gavroche", "target": "Valjean", "value": 1 },
{ "source": "Gillenormand", "target": "Cosette", "value": 3 },
{ "source": "Gillenormand", "target": "Valjean", "value": 2 },
{ "source": "Magnon", "target": "Gillenormand", "value": 1 },
{ "source": "Magnon", "target": "Mme.Thenardier", "value": 1 },
{ "source": "Mlle.Gillenormand", "target": "Gillenormand", "value": 9 },
{ "source": "Mlle.Gillenormand", "target": "Cosette", "value": 2 },
{ "source": "Mlle.Gillenormand", "target": "Valjean", "value": 2 },
{ "source": "Mme.Pontmercy", "target": "Mlle.Gillenormand", "value": 1 },
{ "source": "Mme.Pontmercy", "target": "Pontmercy", "value": 1 },
{ "source": "Mlle.Vaubois", "target": "Mlle.Gillenormand", "value": 1 },
{ "source": "Lt.Gillenormand", "target": "Mlle.Gillenormand", "value": 2 },
{ "source": "Lt.Gillenormand", "target": "Gillenormand", "value": 1 },
{ "source": "Lt.Gillenormand", "target": "Cosette", "value": 1 },
{ "source": "Marius", "target": "Mlle.Gillenormand", "value": 6 },
{ "source": "Marius", "target": "Gillenormand", "value": 12 },
{ "source": "Marius", "target": "Pontmercy", "value": 1 },
{ "source": "Marius", "target": "Lt.Gillenormand", "value": 1 },
{ "source": "Marius", "target": "Cosette", "value": 21 },
{ "source": "Marius", "target": "Valjean", "value": 19 },
{ "source": "Marius", "target": "Tholomyes", "value": 1 },
{ "source": "Marius", "target": "Thenardier", "value": 2 },
{ "source": "Marius", "target": "Eponine", "value": 5 },
{ "source": "Marius", "target": "Gavroche", "value": 4 },
{ "source": "BaronessT", "target": "Gillenormand", "value": 1 },
{ "source": "BaronessT", "target": "Marius", "value": 1 },
{ "source": "Mabeuf", "target": "Marius", "value": 1 },
{ "source": "Mabeuf", "target": "Eponine", "value": 1 },
{ "source": "Mabeuf", "target": "Gavroche", "value": 1 },
{ "source": "Enjolras", "target": "Marius", "value": 7 },
{ "source": "Enjolras", "target": "Gavroche", "value": 7 },
{ "source": "Enjolras", "target": "Javert", "value": 6 },
{ "source": "Enjolras", "target": "Mabeuf", "value": 1 },
{ "source": "Enjolras", "target": "Valjean", "value": 4 },
{ "source": "Combeferre", "target": "Enjolras", "value": 15 },
{ "source": "Combeferre", "target": "Marius", "value": 5 },
{ "source": "Combeferre", "target": "Gavroche", "value": 6 },
{ "source": "Combeferre", "target": "Mabeuf", "value": 2 },
{ "source": "Prouvaire", "target": "Gavroche", "value": 1 },
{ "source": "Prouvaire", "target": "Enjolras", "value": 4 },
{ "source": "Prouvaire", "target": "Combeferre", "value": 2 },
{ "source": "Feuilly", "target": "Gavroche", "value": 2 },
{ "source": "Feuilly", "target": "Enjolras", "value": 6 },
{ "source": "Feuilly", "target": "Prouvaire", "value": 2 },
{ "source": "Feuilly", "target": "Combeferre", "value": 5 },
{ "source": "Feuilly", "target": "Mabeuf", "value": 1 },
{ "source": "Feuilly", "target": "Marius", "value": 1 },
{ "source": "Courfeyrac", "target": "Marius", "value": 9 },
{ "source": "Courfeyrac", "target": "Enjolras", "value": 17 },
{ "source": "Courfeyrac", "target": "Combeferre", "value": 13 },
{ "source": "Courfeyrac", "target": "Gavroche", "value": 7 },
{ "source": "Courfeyrac", "target": "Mabeuf", "value": 2 },
{ "source": "Courfeyrac", "target": "Eponine", "value": 1 },
{ "source": "Courfeyrac", "target": "Feuilly", "value": 6 },
{ "source": "Courfeyrac", "target": "Prouvaire", "value": 3 },
{ "source": "Bahorel", "target": "Combeferre", "value": 5 },
{ "source": "Bahorel", "target": "Gavroche", "value": 5 },
{ "source": "Bahorel", "target": "Courfeyrac", "value": 6 },
{ "source": "Bahorel", "target": "Mabeuf", "value": 2 },
{ "source": "Bahorel", "target": "Enjolras", "value": 4 },
{ "source": "Bahorel", "target": "Feuilly", "value": 3 },
{ "source": "Bahorel", "target": "Prouvaire", "value": 2 },
{ "source": "Bahorel", "target": "Marius", "value": 1 },
{ "source": "Bossuet", "target": "Marius", "value": 5 },
{ "source": "Bossuet", "target": "Courfeyrac", "value": 12 },
{ "source": "Bossuet", "target": "Gavroche", "value": 5 },
{ "source": "Bossuet", "target": "Bahorel", "value": 4 },
{ "source": "Bossuet", "target": "Enjolras", "value": 10 },
{ "source": "Bossuet", "target": "Feuilly", "value": 6 },
{ "source": "Bossuet", "target": "Prouvaire", "value": 2 },
{ "source": "Bossuet", "target": "Combeferre", "value": 9 },
{ "source": "Bossuet", "target": "Mabeuf", "value": 1 },
{ "source": "Bossuet", "target": "Valjean", "value": 1 },
{ "source": "Joly", "target": "Bahorel", "value": 5 },
{ "source": "Joly", "target": "Bossuet", "value": 7 },
{ "source": "Joly", "target": "Gavroche", "value": 3 },
{ "source": "Joly", "target": "Courfeyrac", "value": 5 },
{ "source": "Joly", "target": "Enjolras", "value": 5 },
{ "source": "Joly", "target": "Feuilly", "value": 5 },
{ "source": "Joly", "target": "Prouvaire", "value": 2 },
{ "source": "Joly", "target": "Combeferre", "value": 5 },
{ "source": "Joly", "target": "Mabeuf", "value": 1 },
{ "source": "Joly", "target": "Marius", "value": 2 },
{ "source": "Grantaire", "target": "Bossuet", "value": 3 },
{ "source": "Grantaire", "target": "Enjolras", "value": 3 },
{ "source": "Grantaire", "target": "Combeferre", "value": 1 },
{ "source": "Grantaire", "target": "Courfeyrac", "value": 2 },
{ "source": "Grantaire", "target": "Joly", "value": 2 },
{ "source": "Grantaire", "target": "Gavroche", "value": 1 },
{ "source": "Grantaire", "target": "Bahorel", "value": 1 },
{ "source": "Grantaire", "target": "Feuilly", "value": 1 },
{ "source": "Grantaire", "target": "Prouvaire", "value": 1 },
{ "source": "MotherPlutarch", "target": "Mabeuf", "value": 3 },
{ "source": "Gueulemer", "target": "Thenardier", "value": 5 },
{ "source": "Gueulemer", "target": "Valjean", "value": 1 },
{ "source": "Gueulemer", "target": "Mme.Thenardier", "value": 1 },
{ "source": "Gueulemer", "target": "Javert", "value": 1 },
{ "source": "Gueulemer", "target": "Gavroche", "value": 1 },
{ "source": "Gueulemer", "target": "Eponine", "value": 1 },
{ "source": "Babet", "target": "Thenardier", "value": 6 },
{ "source": "Babet", "target": "Gueulemer", "value": 6 },
{ "source": "Babet", "target": "Valjean", "value": 1 },
{ "source": "Babet", "target": "Mme.Thenardier", "value": 1 },
{ "source": "Babet", "target": "Javert", "value": 2 },
{ "source": "Babet", "target": "Gavroche", "value": 1 },
{ "source": "Babet", "target": "Eponine", "value": 1 },
{ "source": "Claquesous", "target": "Thenardier", "value": 4 },
{ "source": "Claquesous", "target": "Babet", "value": 4 },
{ "source": "Claquesous", "target": "Gueulemer", "value": 4 },
{ "source": "Claquesous", "target": "Valjean", "value": 1 },
{ "source": "Claquesous", "target": "Mme.Thenardier", "value": 1 },
{ "source": "Claquesous", "target": "Javert", "value": 1 },
{ "source": "Claquesous", "target": "Eponine", "value": 1 },
{ "source": "Claquesous", "target": "Enjolras", "value": 1 },
{ "source": "Montparnasse", "target": "Javert", "value": 1 },
{ "source": "Montparnasse", "target": "Babet", "value": 2 },
{ "source": "Montparnasse", "target": "Gueulemer", "value": 2 },
{ "source": "Montparnasse", "target": "Claquesous", "value": 2 },
{ "source": "Montparnasse", "target": "Valjean", "value": 1 },
{ "source": "Montparnasse", "target": "Gavroche", "value": 1 },
{ "source": "Montparnasse", "target": "Eponine", "value": 1 },
{ "source": "Montparnasse", "target": "Thenardier", "value": 1 },
{ "source": "Toussaint", "target": "Cosette", "value": 2 },
{ "source": "Toussaint", "target": "Javert", "value": 1 },
{ "source": "Toussaint", "target": "Valjean", "value": 1 },
{ "source": "Child1", "target": "Gavroche", "value": 2 },
{ "source": "Child2", "target": "Gavroche", "value": 2 },
{ "source": "Child2", "target": "Child1", "value": 3 },
{ "source": "Brujon", "target": "Babet", "value": 3 },
{ "source": "Brujon", "target": "Gueulemer", "value": 3 },
{ "source": "Brujon", "target": "Thenardier", "value": 3 },
{ "source": "Brujon", "target": "Gavroche", "value": 1 },
{ "source": "Brujon", "target": "Eponine", "value": 1 },
{ "source": "Brujon", "target": "Claquesous", "value": 1 },
{ "source": "Brujon", "target": "Montparnasse", "value": 1 },
{ "source": "Mme.Hucheloup", "target": "Bossuet", "value": 1 },
{ "source": "Mme.Hucheloup", "target": "Joly", "value": 1 },
{ "source": "Mme.Hucheloup", "target": "Grantaire", "value": 1 },
{ "source": "Mme.Hucheloup", "target": "Bahorel", "value": 1 },
{ "source": "Mme.Hucheloup", "target": "Courfeyrac", "value": 1 },
{ "source": "Mme.Hucheloup", "target": "Gavroche", "value": 1 },
{ "source": "Mme.Hucheloup", "target": "Enjolras", "value": 1 }
]
};
// Specify the dimensions of the chart.
const width = 928;
const height = 600;
// Specify the color scale.
const color = d3.scaleOrdinal(d3.schemeCategory10);
// The force simulation mutates links and nodes, so create a copy
// so that re-evaluating this cell produces the same result.
const links = data.links.map(d => ({ ...d }));
const nodes = data.nodes.map(d => ({ ...d }));
// Create a simulation with several forces.
const simulation = d3.forceSimulation(nodes)
.force("link", d3.forceLink(links).id(d => d.id))
.force("charge", d3.forceManyBody())
.force("center", d3.forceCenter(width / 2, height / 2))
.on("tick", ticked);
// Create the SVG container.
const svg = d3.create("svg")
.attr("width", width)
.attr("height", height)
.attr("viewBox", [0, 0, width, height])
.attr("style", "max-width: 100%; height: auto;");
// Add a line for each link, and a circle for each node.
const link = svg.append("g")
.attr("stroke", "#999")
.attr("stroke-opacity", 0.6)
.selectAll()
.data(links)
.join("line")
.attr("stroke-width", d => Math.sqrt(d.value));
const node = svg.append("g")
.attr("stroke", "#fff")
.attr("stroke-width", 1.5)
.selectAll()
.data(nodes)
.join("circle")
.attr("r", 5)
.attr("fill", d => color(d.group));
node.append("title")
.text(d => d.id);
// Add a drag behavior.
node.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended));
// Set the position attributes of links and nodes each time the simulation ticks.
function ticked() {
link
.attr("x1", d => d.source.x)
.attr("y1", d => d.source.y)
.attr("x2", d => d.target.x)
.attr("y2", d => d.target.y);
node
.attr("cx", d => d.x)
.attr("cy", d => d.y);
}
// Reheat the simulation when drag starts, and fix the subject position.
function dragstarted(event) {
if (!event.active) simulation.alphaTarget(0.3).restart();
event.subject.fx = event.subject.x;
event.subject.fy = event.subject.y;
}
// Update the subject (dragged node) position during drag.
function dragged(event) {
event.subject.fx = event.x;
event.subject.fy = event.y;
}
// Restore the target alpha so the simulation cools after dragging ends.
// Unfix the subject position now that it’s no longer being dragged.
function dragended(event) {
if (!event.active) simulation.alphaTarget(0);
event.subject.fx = null;
event.subject.fy = null;
}
const chart = svg.node();
const area = document.getElementById("drawArea");
area.appendChild(chart);
</script>
