Published
Edited
Apr 22, 2021
1 fork
2 stars
Insert cell
md`# Circle packing with zoom`
Insert cell
{
let data = await getData();
let hierarchy = makeHierarchy(data, 'liabilities');
let height = 900;
let two = new Two({
type: Two.Types.canvas,
width: width,
height: height
});

let group = two.makeGroup();

let pack = d3.pack()
.size([width,height])
.padding(3);

let root = d3.hierarchy(hierarchy)
.sum(d => d.value)
.sort((a,b) => b.value - a.value);

pack(root);

root.each( node => {
if(node.r > 0) {
let circle = two.makeCircle(node.x, node.y, node.r);
group.add(circle);

// dont need label for root
if(node.parent !== null) {
let text = two.makeText(node.data.currency, node.x, node.y);
text.size = node.r * 0.25;

group.add(text);
}
}
});

two.update();

// Adding zoom
d3.select(two.renderer.domElement).call(d3.zoom()
.scaleExtent([0.5,30])
.on('zoom', (event) => {
group.translation.set(event.transform.x, event.transform.y);
group.scale = event.transform.k;

two.update();
})
);

return two.renderer.domElement;
}
Insert cell
function makeHierarchy(data, what) {
let hierarchy = { name: 'root', children: [], value: 0 };

data.forEach( d => {

/*
assets: "2096.193510424425191384"
currency: "AAVE"
liabilities: "2094.070500346682368036"
rate: "1.00"
*/
let usd = d.values.find(v => v.currency === 'USD');

hierarchy.children.push( {
currency: d.currency,
value: parseFloat(usd[what]),
children: []
});
});

return hierarchy;
}
Insert cell
Insert cell
Insert cell
Insert cell

One platform to build and deploy the best data apps

Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.
Learn more