Published
Edited
Dec 18, 2019
1 fork
md`# Tree Cash Flows`
chart = {
const root = d3.hierarchy(data);
root.x0 = dy / 2;
root.y0 = 0;
root.descendants().forEach((d, i) => {
d.id = i;
d._children = d.children;
if (d.depth && d.data.name.length !== 7) d.children = null;
});
const svg = d3.create("svg")
.attr("viewBox", [-margin.left, -margin.top, width, dx])
.style("font", "10px sans-serif")
.style("user-select", "none");
const gLink = svg.append("g")
.attr("fill", "none")
.attr("stroke", "#555")
.attr("stroke-opacity", 0.4)
.attr("stroke-width", 1.5);
const gNode = svg.append("g")
.attr("cursor", "pointer")
.attr("pointer-events", "all");
function update(source) {
const duration = d3.event && d3.event.altKey ? 2500 : 250;
const nodes = root.descendants().reverse();
const links = root.links();
// Compute the new tree layout.
tree(root);
let left = root;
let right = root;
root.eachBefore(node => {
if (node.x < left.x) left = node;
if (node.x > right.x) right = node;
});
const height = right.x - left.x + margin.top + margin.bottom;
const transition = svg.transition()
.duration(duration)
.attr("viewBox", [-margin.left, left.x - margin.top, width, height])
.tween("resize", window.ResizeObserver ? null : () => () => svg.dispatch("toggle"));
// Update the nodes…
const node = gNode.selectAll("g")
.data(nodes, d => d.id);
// Enter any new nodes at the parent's previous position.
const nodeEnter = node.enter().append("g")
.attr("transform", d => `translate(${source.y0},${source.x0})`)
.attr("fill-opacity", 0)
.attr("stroke-opacity", 0)
.on("click", d => {
d.children = d.children ? null : d._children;
update(d);
});
nodeEnter.append("circle")
.attr("r", 8)
.attr("fill", d => d._children ? "steelblue" : "white")
.attr("stroke", d => d._children ? "#555" : "#999")
.attr("stroke-width", 1);
nodeEnter.append("text")
.attr("dy", "0.4em")
.attr("x", d => d._children ? -14 : 14)
.attr("text-anchor", d => d._children ? "end" : "start")
.attr("font-size", "18px")
.text(d => {
if (d.data.name === 'capex' || d.data.name === 'opex') {
return `${d.data.name} ${format(d.data.value)}`;
}
return d.data.name;
});
// Transition nodes to their new position.
const nodeUpdate = node.merge(nodeEnter).transition(transition)
.attr("transform", d => `translate(${d.y},${d.x})`)
.attr("fill-opacity", 1)
.attr("stroke-opacity", 1);
// Transition exiting nodes to the parent's new position.
const nodeExit = node.exit().transition(transition).remove()
.attr("transform", d => `translate(${source.y},${source.x})`)
.attr("fill-opacity", 0)
.attr("stroke-opacity", 0);
// Update the links…
const link = gLink.selectAll("path")
.data(links, d => d.target.id);
// Enter any new links at the parent's previous position.
const linkEnter = link.enter().append("path")
.attr("d", d => {
const o = {x: source.x0, y: source.y0};
return diagonal({source: o, target: o});
});
// Transition links to their new position.
link.merge(linkEnter).transition(transition)
.attr("d", diagonal);
// Transition exiting nodes to the parent's new position.
link.exit().transition(transition).remove()
.attr("d", d => {
const o = {x: source.x, y: source.y};
return diagonal({source: o, target: o});
});
// Stash the old positions for transition.
root.eachBefore(d => {
d.x0 = d.x;
d.y0 = d.y;
});
}
update(root);
return svg.node();
}
format = {
const f = d3.format("$.3s");
return d => `${f(d)}`;
}
diagonal = d3.linkHorizontal().x(d => d.y).y(d => d.x)
tree = d3.tree().nodeSize([dx, dy])
dx = 20
dy = width / 5
margin = ({top: 40, right: 80, bottom: 40, left: 60})
d3 = require("d3@5")
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.