ANCORA IMPARO - Programming since 2001 and still learning. -
NIHIL DIFFICILE VOLENTI
Published
Edited
Apr 26, 2020
chart = {
const links = data.links.map(d => Object.create(d));
const nodes = data.nodes.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 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));
svg.append("rect")
.attr("x",-width/2)
.attr("y",-height/2+2*width/100)
.attr("width", width/100)
.attr("height",width/100)
.style("fill", "red")
svg.append("rect")
.attr("x",-width/2)
.attr("y",-height/2+5*width/100)
.attr("width", width/100)
.attr("height",width/100)
.style("fill", "gray")
svg.append("text")
.attr("x", -width/2+2.5*width/100)
.attr("y", -height/2+3*width/100)
.text("positive")
.style("font-size", "15px")
svg.append("text")
.attr("x", -width/2+2.5*width/100)
.attr("y", -height/2+6*width/100)
.text("subject")
.style("font-size", "15px")
node.append("title")
.text(d => d.id+'\n'+d.group);
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());
return svg.node();
}
data = (await fetch("https://raw.githubusercontent.com/alessandro-gentilini/alessandro-gentilini.github.io/master/COVID-19/vo_graph.json")).json()
width = 800
height = 800
color = function(d){
if(d.id==='hswRareX') return 'cyan';
if(d.id==='FxZZNlJK') return 'yellow';
var colors = {'positive':'red','subject':'gray'};
return colors[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.
