Published
Edited
May 6, 2021
chart = {
const svg = d3.create("svg")
.attr("viewBox", [0, 0, width, height]);
var defs = svg.append("defs");
var gradient = defs.append("linearGradient")
.attr("id", "svgGradient")
.attr("x1", "0%")
.attr("x2", "100%")
.attr("y1", "0%")
.attr("y2", "100%");
gradient.append("stop")
.attr('class', 'start')
.attr("offset", "0%")
.attr("stop-color", "yellow")
.attr("stop-opacity", 1);
gradient.append("stop")
.attr('class', 'end')
.attr("offset", "100%")
.attr("stop-color", "pink")
.attr("stop-opacity", 1);
svg.append("g")
.attr("stroke", "white")
.attr("fill", "url(#svgGradient)")
.selectAll("rect")
.data(data)
.join("rect")
.attr("x", (d, i) => x(i))
.attr("y", d => y(d.value))
.attr("height", d => y(0) - y(d.value))
.attr("width", x.bandwidth());
svg.append("g")
.call(xAxis);
svg.append("g")
.call(yAxis);
return svg.node();
}
data = Object.assign(d3.csvParse(await FileAttachment("Covid-19_Cases_Total@1.csv").text(), ({Name,Cases_cumulative_total}) => ({name: Name, value: + Cases_cumulative_total})).sort((a, b) => d3.descending(a.value, b.value)), {format: ",.2r", y: "↑ Cases Total"})
x = d3.scaleBand()
.domain(d3.range(data.length))
.range([margin.left, width - margin.right])
.padding(0.1)
y = d3.scaleLinear()
.domain([0, d3.max(data, d => d.value)]).nice()
.range([height - margin.bottom, margin.top])
xAxis = g => g
.attr("transform", `translate(0,${height - margin.bottom})`)
.call(d3.axisBottom(x).tickFormat(i => data[i].name).tickSizeOuter(0))
.selectAll("text")
.style("text-anchor", "end")
.attr("dx", "-0.8em")
.attr("dy", "0.3em")
.attr("transform", "rotate(-65)");
yAxis = g => g
.attr("transform", `translate(${margin.left},0)`)
.call(d3.axisLeft(y).ticks(null, data.format))
.call(g => g.select(".domain").remove())
.call(g => g.append("text")
.attr("x", -margin.left)
.attr("y", 10)
.attr("fill", "currentColor")
.attr("text-anchor", "start")
.text(data.y))
color = "#dd63ae"
height = 500
margin = ({top: 30, right: 0, bottom: 130, left: 80})
d3 = require("d3@6")
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.
