Published
Edited
Jun 8, 2020
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chart = {
const links = link_data.map(d => Object.create(d));
const nodes = node_data.map(d => Object.create(d));
const simulation = d3.forceSimulation(nodes)
.force("link", d3.forceLink(links).id(d => d.id))
.force("charge", d3.forceManyBody())
.force("x", d3.forceX())
.force("y", d3.forceY());
const svg = d3.create("svg")
.attr("viewBox", [-width / 2, -height / 2, width, height]);
const defs = svg.append("defs").append("marker")
.attr('id', 'arrowhead')
.attr('viewBox', '-0 -5 10 10')
.attr('refX', 13)
.attr('refY', 0)
.attr('orient', 'auto')
.attr('markerWidth', 8)
.attr('markerHeight', 8)
.attr('xoverflow', 'visible')
.append('svg:path')
.attr('d', 'M 0,-5 L 10,0 L 0,5')
.attr('fill', '#999')
.style('stroke', 'none');
const link = svg.append("g")
.attr("stroke", "#999")
.attr("stroke-opacity", 0.6)
.selectAll("line")
.data(links)
.join("line")
.attr("stroke-width", 1)
.attr("marker-end", "url(#arrowhead)");
link.append("title")
.text(d => d.certificate_id);
const node = svg.append("g")
.attr("stroke", "#fff")
.attr("stroke-width", 1.5)
.selectAll("circle")
.data(nodes)
.join("circle")
.attr("r", 5)
.attr("fill", color)
.call(drag(simulation));
node.append("title")
.text(d => d.name);
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("cx", d => d.x)
.attr("cy", d => d.y);
});
invalidation.then(() => simulation.stop());
svg.call(d3.zoom()
.extent([[0, 0], [width, height]])
.scaleExtent([1, 8])
.on("zoom", zoomed));
function zoomed() {
node.attr("transform", d3.event.transform);
link.attr("transform", d3.event.transform);
}
return svg.node();
}
node_data = FileAttachment("2020-06-07-nodes.json").json()
link_data = FileAttachment("2020-06-07-links@2.json").json()
height = 680
color = {
const scale = d3.scaleOrdinal(d3.schemeCategory10);
return d => scale(d.group);
}
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.
