I love to build dataviz for insight discovery. I also love to put technology to the service of humanity
Published
Edited
Jun 26, 2020
6 stars
chart = {
// const links = data.links.map(d => Object.create(d));
// const nodes = data.nodes.map(d => Object.create(d));
// Avoids flickering
const links = data.links;
const nodes = data.nodes;
const simulation = d3.forceSimulation(nodes)
.force("link", d3.forceLink(links).id(d => d.id))
.force("charge", d3.forceManyBody().strength(-charge))
if (useBoundary)
simulation
.force("boundary", forceBoundary((-width/2)+10, (-height/2)+10, (width/2)-10, (height/2)-10))
else
simulation
.force("x", d3.forceX())
.force("y", d3.forceY());
const svg = d3.select(DOM.svg(width, height))
.attr("viewBox", [-width / 2, -height / 2, 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")
.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.id);
const 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);
}
simulation.on("tick", ticked);
ticked();
invalidation.then(() => simulation.stop());
return svg.node();
}
data = d3.json("https://gist.githubusercontent.com/mbostock/74cb803c013404ac30e63f020a52a2fd/raw/c7c74c939b602c56c80848963f9ad24802baaead/graph.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);
}
viewof charge = slider({
min: 10,
max: 1000,
step: 10,
value: 200,
description: "Repulsion between nodes"
})
viewof useBoundary = checkbox({
options: [{ value: "true", label: "Use force Boundary" }],
value: "true"
})
d3 = require("d3@5")
forceBoundary = require("d3-force-boundary")
import {slider,checkbox} from "@jashkenas/inputs"
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.
