Published
Edited
Mar 26, 2022
Importers
2 stars
chart = {
const svg = d3
.select(DOM.svg(width, height))
.style("font", "10px sans-serif")
.style("width", "100%")
.style("height", "auto")
.style("background", "#fff")
.attr("text-anchor", "middle");
let simulations = new Map();
let g = svg.append("g");
let topSimulation = d3
.forceSimulation()
.force("collide", forceCollideTop)
.force("manybody", d3.forceManyBody().strength(0))
.force("center", d3.forceCenter(width / 2, height / 2))
.stop();
function render() {
let groups = getData(sliderTime.value.getFullYear());
let ng = g
.selectAll("g.node-group")
.data(groups, g => g[0].name)
.attr("stroke", "#fff")
.attr("stroke-width", 1.5);
ng.exit().remove();
let enter = ng
.enter()
.append("g")
.attr("class", "node-group");
ng = ng.merge(enter);
ng.each(function(nodes) {
const nodeG = d3.select(this);
let simulation;
if (simulations.has(nodes[0].name)) {
simulation = simulations.get(nodes[0].name);
} else {
simulation = d3
.forceSimulation()
.force("collide", forceCollide)
.force("center", d3.forceCenter(0, 0))
.stop();
simulations.set(nodes[0].name, simulation);
}
simulation.nodes(nodes);
tickSimulation(simulation);
let node = nodeG
.selectAll("g.node")
.data(nodes, d => d.name)
.join(
enter => {
let g = enter
.append("g")
.attr("class", "node")
.attr("transform", d => `translate(${d.x}, ${d.y})`);
g.append("circle")
.attr("r", d => radius(d))
.attr("fill", "#fff")
.attr("stroke", "#555");
g.append("image")
.attr("href", d => d.logo)
.attr("width", d => radius(d) * 1.4)
.attr("height", d => radius(d) * 1.4)
.attr(
"transform",
d => `translate(${-radius(d) * 0.7}, ${-radius(d) * 0.7})`
);
g.append("title").text(d => d.name);
return g;
},
update =>
update
.transition()
.attr("transform", d => `translate(${d.x}, ${d.y})`),
exit => exit.remove()
);
});
for (let group of groups) {
let [minX, maxX] = d3.extent(group, g => g.x);
let [minY, maxY] = d3.extent(group, g => g.y);
group.size = Math.max(maxX - minX, maxY - minY);
}
topSimulation.nodes(groups);
tickSimulation(topSimulation);
ng.attr("transform", d => `translate(${d.x}, ${d.y})`);
}
render();
sliderTime.addEventListener("input", render);
return svg.node();
}
tickSimulation = simulation => {
for (
let i = 0,
n = Math.ceil(
Math.log(simulation.alphaMin()) / Math.log(1 - simulation.alphaDecay())
);
i < n;
++i
) {
simulation.tick();
}
}
radius = ({ root }) => (root ? 30 : 20)
height = width
getData = year => {
const companiesThatExist = JSON.parse(JSON.stringify(all))
.filter(
entry =>
entry.period[0] <= year &&
(entry.period[1] === undefined || entry.period[1] >= year)
)
.map(c => ({ ...c, children: [] }));
let roots = companiesThatExist.filter(c => !c.parent);
let index = new Map(companiesThatExist.map(m => [m.name, m]));
for (let elem of companiesThatExist) {
const { parent } = elem;
if (parent) {
if (index.has(parent)) {
index.get(parent).children.push(elem);
} else {
if (holdingCompanies.has(parent)) {
let holder = {
...holdingCompanies.get(parent),
children: []
};
roots.push(holder);
index.set(parent, holder);
holder.children.push(elem);
} else {
throw new Error(`Looked for ${parent} but couldn’t find it.`);
}
}
}
}
return roots.map(r => {
let { children, ...rest } = r;
return [
{
root: true,
...rest
}
].concat(children);
});
}
pack = data =>
d3
.pack()
.size([width - 2, height - 2])
.padding(3)(
d3
.hierarchy(data)
.sum(d => d.value)
.sort((a, b) => b.value - a.value)
)
all = {
const name = (name, logo) => elem => ({ ...elem, name, logo });
return [
/* GM */
...[{ period: [1908] }].map(name("General Motors")),
...[{ period: [1911, 1918] }, { period: [1918], p: "General Motors" }].map(
name("Chevrolet")
),
...[{ period: [1989, 1997], p: "Chevrolet" }].map(name("Geo")),
...[{ period: [1985, 1990], p: "General Motors" }].map(name("Saturn")),
...[
{ period: [1897, 1908] },
{ period: [1908, 2004], p: "General Motors" }
].map(name("Oldsmobile")),
...[{ period: [1899, 1908] }, { period: [1908], p: "General Motors" }].map(
name("Buick")
),
...[{ period: [1902, 1909] }, { period: [1909], p: "General Motors" }].map(
name("Cadillac")
),
...[{ period: [1926, 2010], p: "General Motors" }].map(name("Pontiac")),
...[{ period: [1856, 1931] }, { period: [1931], p: "General Motors" }].map(
name("Holden")
),
/* Ford */
...[{ period: [1903] }].map(
name("Ford", "https://www.carlogos.org/logo/Ford-logo-2003-640x240.jpg")
),
...[{ period: [1917, 1922] }, { period: [1922], p: "Ford" }].map(
name("Lincoln")
),
/* VW */
...[{ period: [1937] }].map(
name(
"VW",
"https://www.carlogos.org/logo/Volkswagen-logo-2015-640x550.jpg"
)
),
...[
{ period: [1910, 1910] },
{ period: [1932, 1969], p: "Auto Union" },
{ period: [1969], p: "VW" }
].map(name("Audi")),
...[{ period: [1931, 1937] }, { period: [1937], p: "VW" }].map(
name("Porsche")
),
...[{ period: [1963, 1998] }, { period: [1998], p: "Audi" }].map(
name("Lamborghini")
),
...[
{ period: [1919, 1931] },
{ period: [1931, 1980], p: "Rolls Royce" },
{ period: [1980, 1998], p: "Vickers" },
{ period: [1998], p: "VW" }
].map(name("Bentley")),
/* Chrysler */
...[
{ period: [1925, 1998] },
{ period: [1998, 2007], p: "DaimlerChrysler" },
{ period: [2007, 2014] },
{ period: [2014], p: "Fiat Chrysler" }
].map(name("Chrysler")),
...[{ period: [2014] }].map(
name(
"Fiat Chrysler",
"https://upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Fiat_Chrysler_Automobiles_logo.svg/1200px-Fiat_Chrysler_Automobiles_logo.svg.png"
)
),
...[
{ period: [1945, 1970] },
{ period: [1970, 1986], p: "AMC" },
{ period: [1987], p: "Chrysler" }
].map(name("Jeep")),
...[
{ period: [1978, 1986], p: "British Leyland" },
{ period: [1986, 1994], p: "Rover Group" },
{ period: [1994, 2000], p: "BMW" },
{ period: [2000, 2008], p: "Ford" },
{ period: [2008, 2012], p: "Tata" },
{ period: [2012], p: "Jaguar Land Rover" }
].map(name("Land Rover")),
...[{ period: [1998, 2007] }].map(
name(
"DaimlerChrysler",
"https://www.carlogos.org/logo/Daimler-logo-640x80.jpg"
)
),
/* Nissan */
...[{ period: [1933] }].map(name("Nissan")),
...[{ period: [1989], p: "Nissan" }].map(name("Infiniti")),
/* Toyota */
...[{ period: [1937] }].map(
name(
"Toyota",
"https://www.carlogos.org/logo/Toyota-logo-1989-640x524.jpg"
)
),
...[{ period: [1989], p: "Toyota" }].map(name("Lexus")),
...[{ period: [2003, 2016], p: "Toyota" }].map(name("Scion")),
/* Honda */
...[{ period: [1946] }].map(name("Honda")),
...[{ period: [1986], p: "Honda" }].map(name("Acura")),
/* BMW */
...[{ period: [1916] }].map(name("BMW")),
/* Movers */
...[
{ period: [1906, 1971] },
{ period: [1971, 1980], p: "British taxpayer-owned" },
{ period: [1980, 2003], p: "Vickers" },
{ period: [2003], p: "BMW" }
].map(name("Rolls Royce")),
...[
{ period: [1933, 1966] },
{ period: [1966, 1968], p: "British Motor Holdings" },
{ period: [1968, 1984], p: "British Leyland" },
{ period: [1990, 2008], p: "Ford" },
{ period: [2008, 2012], p: "Tata" },
{ period: [2012], p: "Jaguar Land Rover" }
].map(name("Jaguar")),
...[
{ period: [1927, 1999] },
{ period: [1999, 2000], p: "Ford" },
{ period: [2000], p: "Geely Holding Group" }
].map(name("Volvo")),
/* Independents */
...[{ period: [1899, 2014] }].map(name("Fiat")),
...[{ period: [2003] }].map(name("Tesla")),
...[{ period: [1868] }].map(name("Tata")),
...[{ period: [1999] }].map(name("Spyker")),
...[
{ period: [1945, 1968] },
{
period: [1990, 2010],
p: "General Motors"
},
{
period: [2010, 2012],
p: "Spyker"
}
].map(name("Saab")),
...[{ period: [1954, 1988] }].map(
name(
"AMC",
"https://upload.wikimedia.org/wikipedia/commons/thumb/9/96/American-motors.svg/1200px-American-motors.svg.png"
)
)
].map(({ name, logo, p: parent, holding, period }) => ({
name,
period,
logo:
logo ||
`https://www.carlogos.org/logo/${name.replace(/ /, "-")}-logo.png`,
parent
}));
}
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