Public
Edited
Sep 23, 2023
Importers
data = await FileAttachment("us-population-state-age.csv").csv({typed: true}).then(
data => data.columns.slice(1).flatMap((age) => data.map((d) => ({state: d.name, age, population: d[age]})))
)
import { legend } from "@d3/color-legend"
width = 928
height = 500
xColumn = "state"
xDomain = d3.groupSort(data, D => -d3.sum(D, d => d[valueColumn]), d => d[xColumn])
yColumn = "age"
valueColumn = "population"
legendWidth = 320
chart = {
const margin = {top: 60, right: 10, bottom: 20, left: 40};
const svg_width = width + margin.left + margin.right;
const svg_height = height + margin.top + margin.bottom;
const svg = d3.create("svg")
.attr("width", svg_width)
.attr("height", svg_height)
.attr("viewBox", [0, 0, svg_width, svg_height])
.attr("style", "max-width: 100%; height: auto; font: 10px sans-serif;");
const chart = svg.append("g")
.attr("transform", `translate(${margin.left}, ${margin.top})`);
const x = d3.scaleBand()
.domain(xDomain)
.range([0, width])
.padding(0.1);
chart.append("g")
.attr("transform", `translate(0, ${height})`)
.call(d3.axisBottom(x).tickSizeOuter(0))
.call(g => g.selectAll(".domain").remove());
const series = d3.stack().keys(d3.union(data.map(d => d[yColumn])))
.value(([, D], key) => D.get(key)[valueColumn])
(d3.index(data, d => d[xColumn], d => d[yColumn]))
const y = d3.scaleLinear()
.domain([0, d3.max(series, d => d3.max(d, d => d[1]))])
.range([height, 0]);
chart.append("g")
.call(d3.axisLeft(y).ticks(null, "s"))
.call(g => g.selectAll(".domain").remove());
const color = d3.scaleOrdinal()
.domain(series.map(d => d.key))
.range(d3.schemeSpectral[series.length])
.unknown("#ccc");
chart.append("g")
.selectAll()
.data(series)
.join("g")
.attr("fill", d => color(d.key))
.selectAll("rect")
.data(D => D.map(d => (d.key = D.key, d)))
.join("rect")
.attr("x", d => x(d.data[0]))
.attr("y", d => y(d[1]))
.attr("height", d => y(d[0]) - y(d[1]))
.attr("width", x.bandwidth());
const theLegend = legend({width: legendWidth, color: color, title: "Age (years)"});
// https://stackoverflow.com/questions/57725403/how-can-i-add-an-external-group-to-an-existing-svg-with-d3-js
svg.append("g")
.attr("transform", `translate(${width - legendWidth}, 0)`)
.append(() => theLegend);
return svg.node();
}
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.
