D3 Log-Scaled Histogram / Bryan Gin-ge Chen

Bryan Gin-ge Chen

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Published

Edited

Jan 6, 2019

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chart = {

const svg = d3.select(DOM.svg(width, height));

const bar = svg.append("g")

.attr("fill", "steelblue")

.selectAll("rect")

.data(bins)

.enter().append("rect")

.attr("x", d => x(d.x0) + 1)

.attr("width", d => Math.max(0, x(d.x1) - x(d.x0) - 1))

.attr("y", d => y(d.length))

.attr("height", d => y.range()[0] - y(d.length));

svg.append("g")

.call(xAxis);

svg.append("g")

.call(yAxis);

return svg.node();

}

data = {

const data = (await require("@observablehq/unemployment")).map(d => d.rate);

data.y = "Counties";

data.x = "Unemployment (%)";

return data;

}

bins = d3.histogram()

.domain(x.domain())

.thresholds(x.ticks(numTicks))

(data)

.filter(d => d.length !== 0)

x = d3.scaleLinear()

.domain(d3.extent(data).map((d,i) => i ? d+1 : d)).nice()

.range([margin.left, width - margin.right])

y = d3.scaleLog()

.domain([.1, d3.max(bins, d => d.length)]).nice()

.range([height - margin.bottom, margin.top])

xAxis = g => g

.attr("transform", `translate(0,${height - margin.bottom})`)

.call(d3.axisBottom(x).tickSizeOuter(0))

.call(g => g.append("text")

.attr("x", width - margin.right)

.attr("y", -4)

.attr("fill", "#000")

.attr("font-weight", "bold")

.attr("text-anchor", "end")

.text(data.x))

yAxis = g => g

.attr("transform", `translate(${margin.left},0)`)

.call(d3.axisLeft(y))

.call(g => g.select(".domain").remove())

.call(g => g.select(".tick:last-of-type text").clone()

.attr("x", 4)

.attr("text-anchor", "start")

.attr("font-weight", "bold")

.text(data.y))

height = 500

margin = ({top: 20, right: 20, bottom: 30, left: 40})

d3 = require("d3@5")

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