chart = {
const links = linksData.map(d => Object.create(d));
const nodes = nodesData.map(d => Object.create(d));
const simulation = d3.forceSimulation(nodes)
.force("link", d3.forceLink(links).id(d => d.id).distance(200).strength(0.25))
.force("charge", d3.forceManyBody())
.force("center", d3.forceCenter(width / 2, height / 2));
const svg = d3.create("svg")
.attr("viewBox", [0, 0, width, height]);
const link = svg.append("g")
.attr("stroke", "#999")
.attr("stroke-opacity", 0.6)
.selectAll("line")
.data(links)
.join("line")
.attr("stroke-width", d => Math.sqrt(d.value));
const node = svg.append("g")
.selectAll(".node")
.data(nodes)
.join("g")
.attr('class', 'node')
.call(drag(simulation));
node.append('circle')
.attr("r", circleRadius)
.attr("fill", '#000')
.each(() => {
const arcs = pie(pieData);
node.selectAll('.arcs')
.data(arcs)
.enter()
.append("path")
.attr("fill", d => {
return d.data.color
})
.attr("d", arc)
});
simulation.on("tick", () => {
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("transform", d => `translate(${d.x}, ${d.y})`);
});
invalidation.then(() => simulation.stop());
return svg.node();
}
linksData = [
{source: "Napoleon", target: "Myriel", value: 1},
{source: "Mlle.Baptistine", target: "Myriel", value: 8},
{source: "Mme.Magloire", target: "Myriel", value: 10},
{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}
]
nodesData = [
{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}
]
height = 600
circleRadius = 25
arcStrokeWidth = 3;
pieData = [
{color: '#007bff', value: 50},
{color: '#f05050', value: 25},
{color: '#ff902b', value: 25}
]
arc = d3.arc()
.innerRadius(circleRadius - arcStrokeWidth)
.outerRadius(circleRadius)
pie = d3.pie()
.value(d => d.value);
drag = simulation => {
function dragstarted(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragended(d) {
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
return d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended);
}
d3 = require("d3@5")
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
