Published
Edited
Dec 31, 2019
chart = {
const svg = d3.create("svg")
.attr("viewBox", [0, 0, width, height]);
svg.append("g")
.call(xAxis);
svg.append("g")
.call(yAxis);
const path = svg.append("g")
.attr("fill", "none")
.attr("stroke", "steelblue")
.attr("stroke-width", 1.5)
.attr("stroke-linejoin", "round")
.attr("stroke-linecap", "round")
.selectAll("path")
.data(data.series)
.join("path")
.style("mix-blend-mode", "multiply")
.attr("d", d => line(d.values));
svg.call(hover, path);
return svg.node();
}
function hover(svg, path) {
svg
.style("position", "relative");
if ("ontouchstart" in document) svg
.style("-webkit-tap-highlight-color", "transparent")
.on("touchmove", moved)
.on("touchstart", entered)
.on("touchend", left)
else svg
.on("mousemove", moved)
.on("mouseenter", entered)
.on("mouseleave", left);
const dot = svg.append("g")
.attr("display", "none");
dot.append("circle")
.attr("r", 2.5);
dot.append("text")
.style("font", "10px sans-serif")
.attr("text-anchor", "middle")
.attr("y", -8);
function moved() {
d3.event.preventDefault();
const ym = y.invert(d3.event.layerY);
const xm = x.invert(d3.event.layerX);
const i1 = d3.bisectLeft(data.dates, xm, 1);
const i0 = i1 - 1;
const i = xm - data.dates[i0] > data.dates[i1] - xm ? i1 : i0;
const s = data.series.reduce((a, b) => Math.abs(a.values[i] - ym) < Math.abs(b.values[i] - ym) ? a : b);
path.attr("stroke", d => d === s ? null : "#ddd").filter(d => d === s).raise();
dot.attr("transform", `translate(${x(data.dates[i])},${y(s.values[i])})`);
dot.select("text").text(s.Name);
}
function entered() {
path.style("mix-blend-mode", null).attr("stroke", "#ddd");
dot.attr("display", null);
}
function left() {
path.style("mix-blend-mode", "multiply").attr("stroke", null);
dot.attr("display", "none");
}
}
height = 600
margin = ({top: 20, right: 20, bottom: 30, left: 40})
x = d3.scaleUtc()
.domain(d3.extent(data.dates))
.range([margin.left, width - margin.right])
y = d3.scaleLinear()
.domain([-2, d3.max(data.series, d => d3.max(d.values))]).nice()
.range([height - margin.bottom, margin.top])
xAxis = g => g
.attr("transform", `translate(0,${height - margin.bottom})`)
.call(d3.axisBottom(x).ticks(width / 80).tickSizeOuter(0))
yAxis = g => g
.attr("transform", `translate(${margin.left},0)`)
.call(d3.axisLeft(y)
.tickValues(d3.ticks(...y.domain(), 10))
.tickFormat(format))
.call(g => g.select(".domain").remove())
.call(g => g.select(".tick:last-of-type text").clone()
.attr("x", 3)
.attr("text-anchor", "start")
.attr("font-weight", "bold")
.text(data.y))
line = d3.line()
.defined(d => !isNaN(d))
.x((d, i) => x(data.dates[i]))
.y(d => y(d))
data = {
const data = d3.csvParse(await FileAttachment("widenD3VerThree.csv").text(), (d, i, columns) => {
return {
Name: d.Name.replace(/, ([\w-]+).*/, " $1"),
values: columns.slice(1).map(k => +d[k])
};
});
return {
y: "%",
series: data,
dates: data.columns.slice(1).map(d3.utcParse("%Y-%m-%d"))
};
}
d3 = require("d3@5")
format = {
const f = d3.format("+.0%");
return x => x === 1 ? "0%" : f(x - 1);
}
width=900
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